Import s3ql_1.15.orig.tar.bz2

17 files changed, 10555 insertions, 7921 deletions

diff --git a/src/s3ql.egg-info/PKG-INFO b/src/s3ql.egg-info/PKG-INFO
index 0e13aa9..f6d8cd5 100644
--- a/src/s3ql.egg-info/PKG-INFO
+++ b/src/s3ql.egg-info/PKG-INFO
@@ -1,6 +1,6 @@
 Metadata-Version: 1.1
 Name: s3ql
-Version: 1.14
+Version: 1.15
 Summary: a full-featured file system for online data storage
 Home-page: http://code.google.com/p/s3ql/
 Author: Nikolaus Rath
diff --git a/src/s3ql.egg-info/SOURCES.txt b/src/s3ql.egg-info/SOURCES.txt
index e47a2a3..c549894 100644
--- a/src/s3ql.egg-info/SOURCES.txt
+++ b/src/s3ql.egg-info/SOURCES.txt
@@ -2,6 +2,7 @@ CREDITS.txt
 Changes.txt
 INSTALL.txt
 LICENSE
+runtests.py
 setup.py
 bin/fsck.s3ql
 bin/mkfs.s3ql
@@ -45,6 +46,37 @@ doc/html/searchindex.js
 doc/html/special.html
 doc/html/tips.html
 doc/html/umount.html
+doc/html/.doctrees/about.doctree
+doc/html/.doctrees/adm.doctree
+doc/html/.doctrees/authinfo.doctree
+doc/html/.doctrees/backends.doctree
+doc/html/.doctrees/contrib.doctree
+doc/html/.doctrees/durability.doctree
+doc/html/.doctrees/environment.pickle
+doc/html/.doctrees/fsck.doctree
+doc/html/.doctrees/impl_details.doctree
+doc/html/.doctrees/index.doctree
+doc/html/.doctrees/installation.doctree
+doc/html/.doctrees/issues.doctree
+doc/html/.doctrees/mkfs.doctree
+doc/html/.doctrees/mount.doctree
+doc/html/.doctrees/resources.doctree
+doc/html/.doctrees/special.doctree
+doc/html/.doctrees/tips.doctree
+doc/html/.doctrees/umount.doctree
+doc/html/.doctrees/man/adm.doctree
+doc/html/.doctrees/man/cp.doctree
+doc/html/.doctrees/man/ctrl.doctree
+doc/html/.doctrees/man/expire_backups.doctree
+doc/html/.doctrees/man/fsck.doctree
+doc/html/.doctrees/man/index.doctree
+doc/html/.doctrees/man/lock.doctree
+doc/html/.doctrees/man/mkfs.doctree
+doc/html/.doctrees/man/mount.doctree
+doc/html/.doctrees/man/pcp.doctree
+doc/html/.doctrees/man/rm.doctree
+doc/html/.doctrees/man/stat.doctree
+doc/html/.doctrees/man/umount.doctree
 doc/html/_sources/about.txt
 doc/html/_sources/adm.txt
 doc/html/_sources/authinfo.txt
@@ -169,8 +201,6 @@ rst/man/rm.rst
 rst/man/stat.rst
 rst/man/umount.rst
 src/s3ql/__init__.py
-src/s3ql/_deltadump.c
-src/s3ql/_deltadump.pyx
 src/s3ql/adm.py
 src/s3ql/block_cache.py
 src/s3ql/cleanup_manager.py
@@ -179,7 +209,8 @@ src/s3ql/cp.py
 src/s3ql/ctrl.py
 src/s3ql/daemonize.py
 src/s3ql/database.py
-src/s3ql/deltadump.py
+src/s3ql/deltadump.c
+src/s3ql/deltadump.pyx
 src/s3ql/fs.py
 src/s3ql/fsck.py
 src/s3ql/inode_cache.py
@@ -206,7 +237,6 @@ src/s3ql/backends/local.py
 src/s3ql/backends/s3.py
 src/s3ql/backends/s3c.py
 src/s3ql/backends/swift.py
-tests/data.tar.bz2
 tests/pytest.ini
 tests/t1_backends.py
 tests/t1_dump.py
@@ -222,6 +252,7 @@ tests/t5_ctrl.py
 tests/t5_fsck.py
 tests/t5_full.py
 tests/t5_lock_rm.py
+tests/test.log
 util/cmdline_lexer.py
 util/distribute_setup.py
 util/sphinx_pipeinclude.py
\ No newline at end of file
diff --git a/src/s3ql/__init__.py b/src/s3ql/__init__.py
index 436d920..df04116 100644
--- a/src/s3ql/__init__.py
+++ b/src/s3ql/__init__.py
@@ -14,7 +14,7 @@ __all__ = [ 'adm', 'backends', 'block_cache', 'cleanup_manager', 'common',
             'parse_args', 'remove', 'statfs', 'umount', 'VERSION',
             'CURRENT_FS_REV', 'REV_VER_MAP' ]
 
-VERSION = '1.14'
+VERSION = '1.15'
 CURRENT_FS_REV = 16
 
 # Maps file system revisions to the last S3QL version that
diff --git a/src/s3ql/_deltadump.c b/src/s3ql/_deltadump.c
deleted file mode 100644
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+++ /dev/null
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-
-  /* "s3ql/_deltadump.pyx":92
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- * # Maximum size of BLOBs
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- * 
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-
-  /* "s3ql/_deltadump.pyx":96
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- * 
- * cdef inline int fwrite(const_void * buf, size_t len_, FILE * fp) except -1:
- */
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-
-  /* "s3ql/_deltadump.pyx":159
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- * def dump_table(table, order, columns, db, fh):             # <<<<<<<<<<<<<<
- *     '''Dump *columns* of *table* into *fh*
- * 
- */
-  __pyx_t_2 = PyCFunction_NewEx(&__pyx_mdef_4s3ql_10_deltadump_1dump_table, NULL, __pyx_n_s_1); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 159; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __Pyx_GOTREF(__pyx_t_2);
-  if (PyObject_SetAttr(__pyx_m, __pyx_n_s__dump_table, __pyx_t_2) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 159; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
-
-  /* "s3ql/_deltadump.pyx":181
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- * 
- * def load_table(table, columns, db, fh):             # <<<<<<<<<<<<<<
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- */
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-  __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
-
-  /* "s3ql/_deltadump.pyx":190
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- * 
- * def _dump_or_load(table, order, columns, db, fh):             # <<<<<<<<<<<<<<
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- */
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-  __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
-
-  /* "s3ql/_deltadump.pyx":1
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- */
-  __pyx_t_2 = PyDict_New(); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  __Pyx_DECREF(((PyObject *)__pyx_t_2)); __pyx_t_2 = 0;
-  goto __pyx_L0;
-  __pyx_L1_error:;
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-  __Pyx_XDECREF(__pyx_t_2);
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-    Py_DECREF(__pyx_m); __pyx_m = 0;
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-static __Pyx_RefNannyAPIStruct *__Pyx_RefNannyImportAPI(const char *modname) {
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-static CYTHON_INLINE void __Pyx_ErrRestore(PyObject *type, PyObject *value, PyObject *tb) {
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-
-#if PY_MAJOR_VERSION < 3
-static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb,
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-    Py_XDECREF(tb);
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-#else /* Python 3+ */
-static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb, PyObject *cause) {
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-    if (tb == Py_None) {
-        tb = 0;
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-        PyErr_SetString(PyExc_TypeError,
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-        goto bad;
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-        else
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-            PyErr_Format(PyExc_TypeError,
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-                         "BaseException, not %R",
-                         type, Py_TYPE(value));
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-            fixed_cause = cause;
-            Py_INCREF(fixed_cause);
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-            PyErr_SetString(PyExc_TypeError,
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-                            "BaseException");
-            goto bad;
-        }
-        PyException_SetCause(value, fixed_cause);
-    }
-    PyErr_SetObject(type, value);
-    if (tb) {
-        PyThreadState *tstate = PyThreadState_GET();
-        PyObject* tmp_tb = tstate->curexc_traceback;
-        if (tb != tmp_tb) {
-            Py_INCREF(tb);
-            tstate->curexc_traceback = tb;
-            Py_XDECREF(tmp_tb);
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-bad:
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-#endif
-
-static void __Pyx_RaiseArgtupleInvalid(
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-{
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-        more_or_less = "exactly";
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-    PyErr_Format(PyExc_TypeError,
-                 "%s() takes %s %" CYTHON_FORMAT_SSIZE_T "d positional argument%s (%" CYTHON_FORMAT_SSIZE_T "d given)",
-                 func_name, more_or_less, num_expected,
-                 (num_expected == 1) ? "" : "s", num_found);
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-
-static void __Pyx_RaiseDoubleKeywordsError(
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-    PyObject* kw_name)
-{
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-        PyString_AsString(kw_name));
-        #endif
-}
-
-static int __Pyx_ParseOptionalKeywords(
-    PyObject *kwds,
-    PyObject **argnames[],
-    PyObject *kwds2,
-    PyObject *values[],
-    Py_ssize_t num_pos_args,
-    const char* function_name)
-{
-    PyObject *key = 0, *value = 0;
-    Py_ssize_t pos = 0;
-    PyObject*** name;
-    PyObject*** first_kw_arg = argnames + num_pos_args;
-    while (PyDict_Next(kwds, &pos, &key, &value)) {
-        name = first_kw_arg;
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-        if (*name) {
-            values[name-argnames] = value;
-            continue;
-        }
-        name = first_kw_arg;
-        #if PY_MAJOR_VERSION < 3
-        if (likely(PyString_CheckExact(key)) || likely(PyString_Check(key))) {
-            while (*name) {
-                if ((CYTHON_COMPILING_IN_PYPY || PyString_GET_SIZE(**name) == PyString_GET_SIZE(key))
-                        && _PyString_Eq(**name, key)) {
-                    values[name-argnames] = value;
-                    break;
-                }
-                name++;
-            }
-            if (*name) continue;
-            else {
-                PyObject*** argname = argnames;
-                while (argname != first_kw_arg) {
-                    if ((**argname == key) || (
-                            (CYTHON_COMPILING_IN_PYPY || PyString_GET_SIZE(**argname) == PyString_GET_SIZE(key))
-                             && _PyString_Eq(**argname, key))) {
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-                    }
-                    argname++;
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-            }
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-        #endif
-        if (likely(PyUnicode_Check(key))) {
-            while (*name) {
-                int cmp = (**name == key) ? 0 :
-                #if !CYTHON_COMPILING_IN_PYPY && PY_MAJOR_VERSION >= 3
-                    (PyUnicode_GET_SIZE(**name) != PyUnicode_GET_SIZE(key)) ? 1 :
-                #endif
-                    PyUnicode_Compare(**name, key);
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-                if (cmp == 0) {
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-                }
-                name++;
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-            if (*name) continue;
-            else {
-                PyObject*** argname = argnames;
-                while (argname != first_kw_arg) {
-                    int cmp = (**argname == key) ? 0 :
-                    #if !CYTHON_COMPILING_IN_PYPY && PY_MAJOR_VERSION >= 3
-                        (PyUnicode_GET_SIZE(**argname) != PyUnicode_GET_SIZE(key)) ? 1 :
-                    #endif
-                        PyUnicode_Compare(**argname, key);
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-                    if (cmp == 0) goto arg_passed_twice;
-                    argname++;
-                }
-            }
-        } else
-            goto invalid_keyword_type;
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-            if (unlikely(PyDict_SetItem(kwds2, key, value))) goto bad;
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-    goto bad;
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-bad:
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-
-static int __Pyx_GetException(PyObject **type, PyObject **value, PyObject **tb) {
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-    PyThreadState *tstate = PyThreadState_GET();
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-#if CYTHON_COMPILING_IN_CPYTHON
-    tmp_type = tstate->exc_type;
-    tmp_value = tstate->exc_value;
-    tmp_tb = tstate->exc_traceback;
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-    tstate->exc_value = local_value;
-    tstate->exc_traceback = local_tb;
-    /* Make sure tstate is in a consistent state when we XDECREF
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-    Py_XDECREF(tmp_value);
-    Py_XDECREF(tmp_tb);
-#else
-    PyErr_SetExcInfo(local_type, local_value, local_tb);
-#endif
-    return 0;
-bad:
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-    Py_XDECREF(local_type);
-    Py_XDECREF(local_value);
-    Py_XDECREF(local_tb);
-    return -1;
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-
-static CYTHON_INLINE void __Pyx_ExceptionSave(PyObject **type, PyObject **value, PyObject **tb) {
-#if CYTHON_COMPILING_IN_CPYTHON
-    PyThreadState *tstate = PyThreadState_GET();
-    *type = tstate->exc_type;
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-    Py_XINCREF(*value);
-    Py_XINCREF(*tb);
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-    PyErr_GetExcInfo(type, value, tb);
-#endif
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-static void __Pyx_ExceptionReset(PyObject *type, PyObject *value, PyObject *tb) {
-#if CYTHON_COMPILING_IN_CPYTHON
-    PyObject *tmp_type, *tmp_value, *tmp_tb;
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-    Py_XDECREF(tmp_type);
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-#else
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-#endif
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-
-static PyObject *__Pyx_Import(PyObject *name, PyObject *from_list, long level) {
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-    PyObject *module = 0;
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-    PyObject *empty_dict = 0;
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-                Py_DECREF(py_level);
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-                        goto bad;
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-    #else
-    if (level>0) {
-        PyErr_SetString(PyExc_RuntimeError, "Relative import is not supported for Python <=2.4.");
-        goto bad;
-    }
-    module = PyObject_CallFunctionObjArgs(py_import,
-        name, global_dict, empty_dict, list, NULL);
-    #endif
-bad:
-    Py_XDECREF(empty_list);
-    Py_XDECREF(py_import);
-    Py_XDECREF(empty_dict);
-    return module;
-}
-
-static CYTHON_INLINE void __Pyx_RaiseImportError(PyObject *name) {
-#if PY_MAJOR_VERSION < 3
-    PyErr_Format(PyExc_ImportError, "cannot import name %.230s",
-                 PyString_AsString(name));
-#else
-    PyErr_Format(PyExc_ImportError, "cannot import name %S", name);
-#endif
-}
-
-static PyObject *
-__Pyx_CyFunction_get_doc(__pyx_CyFunctionObject *op, CYTHON_UNUSED void *closure)
-{
-    if (op->func_doc == NULL && op->func.m_ml->ml_doc) {
-#if PY_MAJOR_VERSION >= 3
-        op->func_doc = PyUnicode_FromString(op->func.m_ml->ml_doc);
-#else
-        op->func_doc = PyString_FromString(op->func.m_ml->ml_doc);
-#endif
-    }
-    if (op->func_doc == 0) {
-        Py_INCREF(Py_None);
-        return Py_None;
-    }
-    Py_INCREF(op->func_doc);
-    return op->func_doc;
-}
-static int
-__Pyx_CyFunction_set_doc(__pyx_CyFunctionObject *op, PyObject *value)
-{
-    PyObject *tmp = op->func_doc;
-    if (value == NULL)
-        op->func_doc = Py_None; /* Mark as deleted */
-    else
-        op->func_doc = value;
-    Py_INCREF(op->func_doc);
-    Py_XDECREF(tmp);
-    return 0;
-}
-static PyObject *
-__Pyx_CyFunction_get_name(__pyx_CyFunctionObject *op)
-{
-    if (op->func_name == NULL) {
-#if PY_MAJOR_VERSION >= 3
-        op->func_name = PyUnicode_InternFromString(op->func.m_ml->ml_name);
-#else
-        op->func_name = PyString_InternFromString(op->func.m_ml->ml_name);
-#endif
-    }
-    Py_INCREF(op->func_name);
-    return op->func_name;
-}
-static int
-__Pyx_CyFunction_set_name(__pyx_CyFunctionObject *op, PyObject *value)
-{
-    PyObject *tmp;
-#if PY_MAJOR_VERSION >= 3
-    if (value == NULL || !PyUnicode_Check(value)) {
-#else
-    if (value == NULL || !PyString_Check(value)) {
-#endif
-        PyErr_SetString(PyExc_TypeError,
-                        "__name__ must be set to a string object");
-        return -1;
-    }
-    tmp = op->func_name;
-    Py_INCREF(value);
-    op->func_name = value;
-    Py_XDECREF(tmp);
-    return 0;
-}
-static PyObject *
-__Pyx_CyFunction_get_self(__pyx_CyFunctionObject *m, CYTHON_UNUSED void *closure)
-{
-    PyObject *self;
-    self = m->func_closure;
-    if (self == NULL)
-        self = Py_None;
-    Py_INCREF(self);
-    return self;
-}
-static PyObject *
-__Pyx_CyFunction_get_dict(__pyx_CyFunctionObject *op)
-{
-    if (op->func_dict == NULL) {
-        op->func_dict = PyDict_New();
-        if (op->func_dict == NULL)
-            return NULL;
-    }
-    Py_INCREF(op->func_dict);
-    return op->func_dict;
-}
-static int
-__Pyx_CyFunction_set_dict(__pyx_CyFunctionObject *op, PyObject *value)
-{
-    PyObject *tmp;
-    if (value == NULL) {
-        PyErr_SetString(PyExc_TypeError,
-               "function's dictionary may not be deleted");
-        return -1;
-    }
-    if (!PyDict_Check(value)) {
-        PyErr_SetString(PyExc_TypeError,
-               "setting function's dictionary to a non-dict");
-        return -1;
-    }
-    tmp = op->func_dict;
-    Py_INCREF(value);
-    op->func_dict = value;
-    Py_XDECREF(tmp);
-    return 0;
-}
-static PyObject *
-__Pyx_CyFunction_get_globals(CYTHON_UNUSED __pyx_CyFunctionObject *op)
-{
-    PyObject* dict = PyModule_GetDict(__pyx_m);
-    Py_XINCREF(dict);
-    return dict;
-}
-static PyObject *
-__Pyx_CyFunction_get_closure(CYTHON_UNUSED __pyx_CyFunctionObject *op)
-{
-    Py_INCREF(Py_None);
-    return Py_None;
-}
-static PyObject *
-__Pyx_CyFunction_get_code(__pyx_CyFunctionObject *op)
-{
-    PyObject* result = (op->func_code) ? op->func_code : Py_None;
-    Py_INCREF(result);
-    return result;
-}
-static PyObject *
-__Pyx_CyFunction_get_defaults(__pyx_CyFunctionObject *op)
-{
-    if (op->defaults_tuple) {
-        Py_INCREF(op->defaults_tuple);
-        return op->defaults_tuple;
-    }
-    if (op->defaults_getter) {
-        PyObject *res = op->defaults_getter((PyObject *) op);
-        if (res) {
-            Py_INCREF(res);
-            op->defaults_tuple = res;
-        }
-        return res;
-    }
-    Py_INCREF(Py_None);
-    return Py_None;
-}
-static PyGetSetDef __pyx_CyFunction_getsets[] = {
-    {(char *) "func_doc", (getter)__Pyx_CyFunction_get_doc, (setter)__Pyx_CyFunction_set_doc, 0, 0},
-    {(char *) "__doc__",  (getter)__Pyx_CyFunction_get_doc, (setter)__Pyx_CyFunction_set_doc, 0, 0},
-    {(char *) "func_name", (getter)__Pyx_CyFunction_get_name, (setter)__Pyx_CyFunction_set_name, 0, 0},
-    {(char *) "__name__", (getter)__Pyx_CyFunction_get_name, (setter)__Pyx_CyFunction_set_name, 0, 0},
-    {(char *) "__self__", (getter)__Pyx_CyFunction_get_self, 0, 0, 0},
-    {(char *) "func_dict", (getter)__Pyx_CyFunction_get_dict, (setter)__Pyx_CyFunction_set_dict, 0, 0},
-    {(char *) "__dict__", (getter)__Pyx_CyFunction_get_dict, (setter)__Pyx_CyFunction_set_dict, 0, 0},
-    {(char *) "func_globals", (getter)__Pyx_CyFunction_get_globals, 0, 0, 0},
-    {(char *) "__globals__", (getter)__Pyx_CyFunction_get_globals, 0, 0, 0},
-    {(char *) "func_closure", (getter)__Pyx_CyFunction_get_closure, 0, 0, 0},
-    {(char *) "__closure__", (getter)__Pyx_CyFunction_get_closure, 0, 0, 0},
-    {(char *) "func_code", (getter)__Pyx_CyFunction_get_code, 0, 0, 0},
-    {(char *) "__code__", (getter)__Pyx_CyFunction_get_code, 0, 0, 0},
-    {(char *) "func_defaults", (getter)__Pyx_CyFunction_get_defaults, 0, 0, 0},
-    {(char *) "__defaults__", (getter)__Pyx_CyFunction_get_defaults, 0, 0, 0},
-    {0, 0, 0, 0, 0}
-};
-#ifndef PY_WRITE_RESTRICTED /* < Py2.5 */
-#define PY_WRITE_RESTRICTED WRITE_RESTRICTED
-#endif
-static PyMemberDef __pyx_CyFunction_members[] = {
-    {(char *) "__module__", T_OBJECT, offsetof(__pyx_CyFunctionObject, func.m_module), PY_WRITE_RESTRICTED, 0},
-    {0, 0, 0,  0, 0}
-};
-static PyObject *
-__Pyx_CyFunction_reduce(__pyx_CyFunctionObject *m, CYTHON_UNUSED PyObject *args)
-{
-#if PY_MAJOR_VERSION >= 3
-    return PyUnicode_FromString(m->func.m_ml->ml_name);
-#else
-    return PyString_FromString(m->func.m_ml->ml_name);
-#endif
-}
-static PyMethodDef __pyx_CyFunction_methods[] = {
-    {__Pyx_NAMESTR("__reduce__"), (PyCFunction)__Pyx_CyFunction_reduce, METH_VARARGS, 0},
-    {0, 0, 0, 0}
-};
-static PyObject *__Pyx_CyFunction_New(PyTypeObject *type, PyMethodDef *ml, int flags,
-                                      PyObject *closure, PyObject *module, PyObject* code) {
-    __pyx_CyFunctionObject *op = PyObject_GC_New(__pyx_CyFunctionObject, type);
-    if (op == NULL)
-        return NULL;
-    op->flags = flags;
-    op->func_weakreflist = NULL;
-    op->func.m_ml = ml;
-    op->func.m_self = (PyObject *) op;
-    Py_XINCREF(closure);
-    op->func_closure = closure;
-    Py_XINCREF(module);
-    op->func.m_module = module;
-    op->func_dict = NULL;
-    op->func_name = NULL;
-    op->func_doc = NULL;
-    op->func_classobj = NULL;
-    Py_XINCREF(code);
-    op->func_code = code;
-    op->defaults_pyobjects = 0;
-    op->defaults = NULL;
-    op->defaults_tuple = NULL;
-    op->defaults_getter = NULL;
-    PyObject_GC_Track(op);
-    return (PyObject *) op;
-}
-static int
-__Pyx_CyFunction_clear(__pyx_CyFunctionObject *m)
-{
-    Py_CLEAR(m->func_closure);
-    Py_CLEAR(m->func.m_module);
-    Py_CLEAR(m->func_dict);
-    Py_CLEAR(m->func_name);
-    Py_CLEAR(m->func_doc);
-    Py_CLEAR(m->func_code);
-    Py_CLEAR(m->func_classobj);
-    Py_CLEAR(m->defaults_tuple);
-    if (m->defaults) {
-        PyObject **pydefaults = __Pyx_CyFunction_Defaults(PyObject *, m);
-        int i;
-        for (i = 0; i < m->defaults_pyobjects; i++)
-            Py_XDECREF(pydefaults[i]);
-        PyMem_Free(m->defaults);
-        m->defaults = NULL;
-    }
-    return 0;
-}
-static void __Pyx_CyFunction_dealloc(__pyx_CyFunctionObject *m)
-{
-    PyObject_GC_UnTrack(m);
-    if (m->func_weakreflist != NULL)
-        PyObject_ClearWeakRefs((PyObject *) m);
-    __Pyx_CyFunction_clear(m);
-    PyObject_GC_Del(m);
-}
-static int __Pyx_CyFunction_traverse(__pyx_CyFunctionObject *m, visitproc visit, void *arg)
-{
-    Py_VISIT(m->func_closure);
-    Py_VISIT(m->func.m_module);
-    Py_VISIT(m->func_dict);
-    Py_VISIT(m->func_name);
-    Py_VISIT(m->func_doc);
-    Py_VISIT(m->func_code);
-    Py_VISIT(m->func_classobj);
-    Py_VISIT(m->defaults_tuple);
-    if (m->defaults) {
-        PyObject **pydefaults = __Pyx_CyFunction_Defaults(PyObject *, m);
-        int i;
-        for (i = 0; i < m->defaults_pyobjects; i++)
-            Py_VISIT(pydefaults[i]);
-    }
-    return 0;
-}
-static PyObject *__Pyx_CyFunction_descr_get(PyObject *func, PyObject *obj, PyObject *type)
-{
-    __pyx_CyFunctionObject *m = (__pyx_CyFunctionObject *) func;
-    if (m->flags & __Pyx_CYFUNCTION_STATICMETHOD) {
-        Py_INCREF(func);
-        return func;
-    }
-    if (m->flags & __Pyx_CYFUNCTION_CLASSMETHOD) {
-        if (type == NULL)
-            type = (PyObject *)(Py_TYPE(obj));
-        return PyMethod_New(func,
-                            type, (PyObject *)(Py_TYPE(type)));
-    }
-    if (obj == Py_None)
-        obj = NULL;
-    return PyMethod_New(func, obj, type);
-}
-static PyObject*
-__Pyx_CyFunction_repr(__pyx_CyFunctionObject *op)
-{
-    PyObject *func_name = __Pyx_CyFunction_get_name(op);
-#if PY_MAJOR_VERSION >= 3
-    return PyUnicode_FromFormat("<cyfunction %U at %p>",
-                                func_name, (void *)op);
-#else
-    return PyString_FromFormat("<cyfunction %s at %p>",
-                               PyString_AsString(func_name), (void *)op);
-#endif
-}
-#if CYTHON_COMPILING_IN_PYPY
-static PyObject * __Pyx_CyFunction_Call(PyObject *func, PyObject *arg, PyObject *kw) {
-    PyCFunctionObject* f = (PyCFunctionObject*)func;
-    PyCFunction meth = PyCFunction_GET_FUNCTION(func);
-    PyObject *self = PyCFunction_GET_SELF(func);
-    Py_ssize_t size;
-    switch (PyCFunction_GET_FLAGS(func) & ~(METH_CLASS | METH_STATIC | METH_COEXIST)) {
-    case METH_VARARGS:
-        if (likely(kw == NULL) || PyDict_Size(kw) == 0)
-            return (*meth)(self, arg);
-        break;
-    case METH_VARARGS | METH_KEYWORDS:
-        return (*(PyCFunctionWithKeywords)meth)(self, arg, kw);
-    case METH_NOARGS:
-        if (likely(kw == NULL) || PyDict_Size(kw) == 0) {
-            size = PyTuple_GET_SIZE(arg);
-            if (size == 0)
-                return (*meth)(self, NULL);
-            PyErr_Format(PyExc_TypeError,
-                "%.200s() takes no arguments (%zd given)",
-                f->m_ml->ml_name, size);
-            return NULL;
-        }
-        break;
-    case METH_O:
-        if (likely(kw == NULL) || PyDict_Size(kw) == 0) {
-            size = PyTuple_GET_SIZE(arg);
-            if (size == 1)
-                return (*meth)(self, PyTuple_GET_ITEM(arg, 0));
-            PyErr_Format(PyExc_TypeError,
-                "%.200s() takes exactly one argument (%zd given)",
-                f->m_ml->ml_name, size);
-            return NULL;
-        }
-        break;
-    default:
-        PyErr_SetString(PyExc_SystemError, "Bad call flags in "
-                        "__Pyx_CyFunction_Call. METH_OLDARGS is no "
-                        "longer supported!");
-        return NULL;
-    }
-    PyErr_Format(PyExc_TypeError, "%.200s() takes no keyword arguments",
-                 f->m_ml->ml_name);
-    return NULL;
-}
-#else
-static PyObject * __Pyx_CyFunction_Call(PyObject *func, PyObject *arg, PyObject *kw) {
-	return PyCFunction_Call(func, arg, kw);
-}
-#endif
-static PyTypeObject __pyx_CyFunctionType_type = {
-    PyVarObject_HEAD_INIT(0, 0)
-    __Pyx_NAMESTR("cython_function_or_method"), /*tp_name*/
-    sizeof(__pyx_CyFunctionObject),   /*tp_basicsize*/
-    0,                                  /*tp_itemsize*/
-    (destructor) __Pyx_CyFunction_dealloc, /*tp_dealloc*/
-    0,                                  /*tp_print*/
-    0,                                  /*tp_getattr*/
-    0,                                  /*tp_setattr*/
-#if PY_MAJOR_VERSION < 3
-    0,                                  /*tp_compare*/
-#else
-    0,                                  /*reserved*/
-#endif
-    (reprfunc) __Pyx_CyFunction_repr,   /*tp_repr*/
-    0,                                  /*tp_as_number*/
-    0,                                  /*tp_as_sequence*/
-    0,                                  /*tp_as_mapping*/
-    0,                                  /*tp_hash*/
-    __Pyx_CyFunction_Call,              /*tp_call*/
-    0,                                  /*tp_str*/
-    0,                                  /*tp_getattro*/
-    0,                                  /*tp_setattro*/
-    0,                                  /*tp_as_buffer*/
-    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags*/
-    0,                                  /*tp_doc*/
-    (traverseproc) __Pyx_CyFunction_traverse,   /*tp_traverse*/
-    (inquiry) __Pyx_CyFunction_clear,   /*tp_clear*/
-    0,                                  /*tp_richcompare*/
-    offsetof(__pyx_CyFunctionObject, func_weakreflist), /* tp_weaklistoffse */
-    0,                                  /*tp_iter*/
-    0,                                  /*tp_iternext*/
-    __pyx_CyFunction_methods,           /*tp_methods*/
-    __pyx_CyFunction_members,           /*tp_members*/
-    __pyx_CyFunction_getsets,           /*tp_getset*/
-    0,                                  /*tp_base*/
-    0,                                  /*tp_dict*/
-    __Pyx_CyFunction_descr_get,         /*tp_descr_get*/
-    0,                                  /*tp_descr_set*/
-    offsetof(__pyx_CyFunctionObject, func_dict),/*tp_dictoffset*/
-    0,                                  /*tp_init*/
-    0,                                  /*tp_alloc*/
-    0,                                  /*tp_new*/
-    0,                                  /*tp_free*/
-    0,                                  /*tp_is_gc*/
-    0,                                  /*tp_bases*/
-    0,                                  /*tp_mro*/
-    0,                                  /*tp_cache*/
-    0,                                  /*tp_subclasses*/
-    0,                                  /*tp_weaklist*/
-    0,                                  /*tp_del*/
-#if PY_VERSION_HEX >= 0x02060000
-    0,                                  /*tp_version_tag*/
-#endif
-};
-static int __Pyx_CyFunction_init(void) {
-#if !CYTHON_COMPILING_IN_PYPY
-    __pyx_CyFunctionType_type.tp_call = PyCFunction_Call;
-#endif
-    if (PyType_Ready(&__pyx_CyFunctionType_type) < 0)
-        return -1;
-    __pyx_CyFunctionType = &__pyx_CyFunctionType_type;
-    return 0;
-}
-static CYTHON_INLINE void *__Pyx_CyFunction_InitDefaults(PyObject *func, size_t size, int pyobjects) {
-    __pyx_CyFunctionObject *m = (__pyx_CyFunctionObject *) func;
-    m->defaults = PyMem_Malloc(size);
-    if (!m->defaults)
-        return PyErr_NoMemory();
-    memset(m->defaults, 0, sizeof(size));
-    m->defaults_pyobjects = pyobjects;
-    return m->defaults;
-}
-static CYTHON_INLINE void __Pyx_CyFunction_SetDefaultsTuple(PyObject *func, PyObject *tuple) {
-    __pyx_CyFunctionObject *m = (__pyx_CyFunctionObject *) func;
-    m->defaults_tuple = tuple;
-    Py_INCREF(tuple);
-}
-
-static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_int64_t(int64_t val) {
-    const int64_t neg_one = (int64_t)-1, const_zero = (int64_t)0;
-    const int is_unsigned = const_zero < neg_one;
-    if ((sizeof(int64_t) == sizeof(char))  ||
-        (sizeof(int64_t) == sizeof(short))) {
-        return PyInt_FromLong((long)val);
-    } else if ((sizeof(int64_t) == sizeof(int)) ||
-               (sizeof(int64_t) == sizeof(long))) {
-        if (is_unsigned)
-            return PyLong_FromUnsignedLong((unsigned long)val);
-        else
-            return PyInt_FromLong((long)val);
-    } else if (sizeof(int64_t) == sizeof(PY_LONG_LONG)) {
-        if (is_unsigned)
-            return PyLong_FromUnsignedLongLong((unsigned PY_LONG_LONG)val);
-        else
-            return PyLong_FromLongLong((PY_LONG_LONG)val);
-    } else {
-        int one = 1; int little = (int)*(unsigned char *)&one;
-        unsigned char *bytes = (unsigned char *)&val;
-        return _PyLong_FromByteArray(bytes, sizeof(int64_t),
-                                     little, !is_unsigned);
-    }
-}
-
-static CYTHON_INLINE int64_t __Pyx_PyInt_from_py_int64_t(PyObject* x) {
-    const int64_t neg_one = (int64_t)-1, const_zero = (int64_t)0;
-    const int is_unsigned = const_zero < neg_one;
-    if (sizeof(int64_t) == sizeof(char)) {
-        if (is_unsigned)
-            return (int64_t)__Pyx_PyInt_AsUnsignedChar(x);
-        else
-            return (int64_t)__Pyx_PyInt_AsSignedChar(x);
-    } else if (sizeof(int64_t) == sizeof(short)) {
-        if (is_unsigned)
-            return (int64_t)__Pyx_PyInt_AsUnsignedShort(x);
-        else
-            return (int64_t)__Pyx_PyInt_AsSignedShort(x);
-    } else if (sizeof(int64_t) == sizeof(int)) {
-        if (is_unsigned)
-            return (int64_t)__Pyx_PyInt_AsUnsignedInt(x);
-        else
-            return (int64_t)__Pyx_PyInt_AsSignedInt(x);
-    } else if (sizeof(int64_t) == sizeof(long)) {
-        if (is_unsigned)
-            return (int64_t)__Pyx_PyInt_AsUnsignedLong(x);
-        else
-            return (int64_t)__Pyx_PyInt_AsSignedLong(x);
-    } else if (sizeof(int64_t) == sizeof(PY_LONG_LONG)) {
-        if (is_unsigned)
-            return (int64_t)__Pyx_PyInt_AsUnsignedLongLong(x);
-        else
-            return (int64_t)__Pyx_PyInt_AsSignedLongLong(x);
-    }  else {
-        #if CYTHON_COMPILING_IN_PYPY && !defined(_PyLong_AsByteArray)
-        PyErr_SetString(PyExc_RuntimeError,
-                        "_PyLong_AsByteArray() not available in PyPy, cannot convert large numbers");
-        #else
-        int64_t val;
-        PyObject *v = __Pyx_PyNumber_Int(x);
-        #if PY_VERSION_HEX < 0x03000000
-        if (likely(v) && !PyLong_Check(v)) {
-            PyObject *tmp = v;
-            v = PyNumber_Long(tmp);
-            Py_DECREF(tmp);
-        }
-        #endif
-        if (likely(v)) {
-            int one = 1; int is_little = (int)*(unsigned char *)&one;
-            unsigned char *bytes = (unsigned char *)&val;
-            int ret = _PyLong_AsByteArray((PyLongObject *)v,
-                                          bytes, sizeof(val),
-                                          is_little, !is_unsigned);
-            Py_DECREF(v);
-            if (likely(!ret))
-                return val;
-        }
-        #endif
-        return (int64_t)-1;
-    }
-}
-
-static CYTHON_INLINE unsigned char __Pyx_PyInt_AsUnsignedChar(PyObject* x) {
-    const unsigned char neg_one = (unsigned char)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(unsigned char) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(unsigned char)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to unsigned char" :
-                    "value too large to convert to unsigned char");
-            }
-            return (unsigned char)-1;
-        }
-        return (unsigned char)val;
-    }
-    return (unsigned char)__Pyx_PyInt_AsUnsignedLong(x);
-}
-
-static CYTHON_INLINE unsigned short __Pyx_PyInt_AsUnsignedShort(PyObject* x) {
-    const unsigned short neg_one = (unsigned short)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(unsigned short) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(unsigned short)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to unsigned short" :
-                    "value too large to convert to unsigned short");
-            }
-            return (unsigned short)-1;
-        }
-        return (unsigned short)val;
-    }
-    return (unsigned short)__Pyx_PyInt_AsUnsignedLong(x);
-}
-
-static CYTHON_INLINE unsigned int __Pyx_PyInt_AsUnsignedInt(PyObject* x) {
-    const unsigned int neg_one = (unsigned int)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(unsigned int) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(unsigned int)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to unsigned int" :
-                    "value too large to convert to unsigned int");
-            }
-            return (unsigned int)-1;
-        }
-        return (unsigned int)val;
-    }
-    return (unsigned int)__Pyx_PyInt_AsUnsignedLong(x);
-}
-
-static CYTHON_INLINE char __Pyx_PyInt_AsChar(PyObject* x) {
-    const char neg_one = (char)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(char) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(char)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to char" :
-                    "value too large to convert to char");
-            }
-            return (char)-1;
-        }
-        return (char)val;
-    }
-    return (char)__Pyx_PyInt_AsLong(x);
-}
-
-static CYTHON_INLINE short __Pyx_PyInt_AsShort(PyObject* x) {
-    const short neg_one = (short)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(short) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(short)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to short" :
-                    "value too large to convert to short");
-            }
-            return (short)-1;
-        }
-        return (short)val;
-    }
-    return (short)__Pyx_PyInt_AsLong(x);
-}
-
-static CYTHON_INLINE int __Pyx_PyInt_AsInt(PyObject* x) {
-    const int neg_one = (int)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(int) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(int)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to int" :
-                    "value too large to convert to int");
-            }
-            return (int)-1;
-        }
-        return (int)val;
-    }
-    return (int)__Pyx_PyInt_AsLong(x);
-}
-
-static CYTHON_INLINE signed char __Pyx_PyInt_AsSignedChar(PyObject* x) {
-    const signed char neg_one = (signed char)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(signed char) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(signed char)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to signed char" :
-                    "value too large to convert to signed char");
-            }
-            return (signed char)-1;
-        }
-        return (signed char)val;
-    }
-    return (signed char)__Pyx_PyInt_AsSignedLong(x);
-}
-
-static CYTHON_INLINE signed short __Pyx_PyInt_AsSignedShort(PyObject* x) {
-    const signed short neg_one = (signed short)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(signed short) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(signed short)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to signed short" :
-                    "value too large to convert to signed short");
-            }
-            return (signed short)-1;
-        }
-        return (signed short)val;
-    }
-    return (signed short)__Pyx_PyInt_AsSignedLong(x);
-}
-
-static CYTHON_INLINE signed int __Pyx_PyInt_AsSignedInt(PyObject* x) {
-    const signed int neg_one = (signed int)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(signed int) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(signed int)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to signed int" :
-                    "value too large to convert to signed int");
-            }
-            return (signed int)-1;
-        }
-        return (signed int)val;
-    }
-    return (signed int)__Pyx_PyInt_AsSignedLong(x);
-}
-
-static CYTHON_INLINE int __Pyx_PyInt_AsLongDouble(PyObject* x) {
-    const int neg_one = (int)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(int) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(int)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to int" :
-                    "value too large to convert to int");
-            }
-            return (int)-1;
-        }
-        return (int)val;
-    }
-    return (int)__Pyx_PyInt_AsLong(x);
-}
-
-static CYTHON_INLINE unsigned long __Pyx_PyInt_AsUnsignedLong(PyObject* x) {
-    const unsigned long neg_one = (unsigned long)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-#if PY_VERSION_HEX < 0x03000000
-    if (likely(PyInt_Check(x))) {
-        long val = PyInt_AS_LONG(x);
-        if (is_unsigned && unlikely(val < 0)) {
-            PyErr_SetString(PyExc_OverflowError,
-                            "can't convert negative value to unsigned long");
-            return (unsigned long)-1;
-        }
-        return (unsigned long)val;
-    } else
-#endif
-    if (likely(PyLong_Check(x))) {
-        if (is_unsigned) {
-            if (unlikely(Py_SIZE(x) < 0)) {
-                PyErr_SetString(PyExc_OverflowError,
-                                "can't convert negative value to unsigned long");
-                return (unsigned long)-1;
-            }
-            return (unsigned long)PyLong_AsUnsignedLong(x);
-        } else {
-            return (unsigned long)PyLong_AsLong(x);
-        }
-    } else {
-        unsigned long val;
-        PyObject *tmp = __Pyx_PyNumber_Int(x);
-        if (!tmp) return (unsigned long)-1;
-        val = __Pyx_PyInt_AsUnsignedLong(tmp);
-        Py_DECREF(tmp);
-        return val;
-    }
-}
-
-static CYTHON_INLINE unsigned PY_LONG_LONG __Pyx_PyInt_AsUnsignedLongLong(PyObject* x) {
-    const unsigned PY_LONG_LONG neg_one = (unsigned PY_LONG_LONG)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-#if PY_VERSION_HEX < 0x03000000
-    if (likely(PyInt_Check(x))) {
-        long val = PyInt_AS_LONG(x);
-        if (is_unsigned && unlikely(val < 0)) {
-            PyErr_SetString(PyExc_OverflowError,
-                            "can't convert negative value to unsigned PY_LONG_LONG");
-            return (unsigned PY_LONG_LONG)-1;
-        }
-        return (unsigned PY_LONG_LONG)val;
-    } else
-#endif
-    if (likely(PyLong_Check(x))) {
-        if (is_unsigned) {
-            if (unlikely(Py_SIZE(x) < 0)) {
-                PyErr_SetString(PyExc_OverflowError,
-                                "can't convert negative value to unsigned PY_LONG_LONG");
-                return (unsigned PY_LONG_LONG)-1;
-            }
-            return (unsigned PY_LONG_LONG)PyLong_AsUnsignedLongLong(x);
-        } else {
-            return (unsigned PY_LONG_LONG)PyLong_AsLongLong(x);
-        }
-    } else {
-        unsigned PY_LONG_LONG val;
-        PyObject *tmp = __Pyx_PyNumber_Int(x);
-        if (!tmp) return (unsigned PY_LONG_LONG)-1;
-        val = __Pyx_PyInt_AsUnsignedLongLong(tmp);
-        Py_DECREF(tmp);
-        return val;
-    }
-}
-
-static CYTHON_INLINE long __Pyx_PyInt_AsLong(PyObject* x) {
-    const long neg_one = (long)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-#if PY_VERSION_HEX < 0x03000000
-    if (likely(PyInt_Check(x))) {
-        long val = PyInt_AS_LONG(x);
-        if (is_unsigned && unlikely(val < 0)) {
-            PyErr_SetString(PyExc_OverflowError,
-                            "can't convert negative value to long");
-            return (long)-1;
-        }
-        return (long)val;
-    } else
-#endif
-    if (likely(PyLong_Check(x))) {
-        if (is_unsigned) {
-            if (unlikely(Py_SIZE(x) < 0)) {
-                PyErr_SetString(PyExc_OverflowError,
-                                "can't convert negative value to long");
-                return (long)-1;
-            }
-            return (long)PyLong_AsUnsignedLong(x);
-        } else {
-            return (long)PyLong_AsLong(x);
-        }
-    } else {
-        long val;
-        PyObject *tmp = __Pyx_PyNumber_Int(x);
-        if (!tmp) return (long)-1;
-        val = __Pyx_PyInt_AsLong(tmp);
-        Py_DECREF(tmp);
-        return val;
-    }
-}
-
-static CYTHON_INLINE PY_LONG_LONG __Pyx_PyInt_AsLongLong(PyObject* x) {
-    const PY_LONG_LONG neg_one = (PY_LONG_LONG)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-#if PY_VERSION_HEX < 0x03000000
-    if (likely(PyInt_Check(x))) {
-        long val = PyInt_AS_LONG(x);
-        if (is_unsigned && unlikely(val < 0)) {
-            PyErr_SetString(PyExc_OverflowError,
-                            "can't convert negative value to PY_LONG_LONG");
-            return (PY_LONG_LONG)-1;
-        }
-        return (PY_LONG_LONG)val;
-    } else
-#endif
-    if (likely(PyLong_Check(x))) {
-        if (is_unsigned) {
-            if (unlikely(Py_SIZE(x) < 0)) {
-                PyErr_SetString(PyExc_OverflowError,
-                                "can't convert negative value to PY_LONG_LONG");
-                return (PY_LONG_LONG)-1;
-            }
-            return (PY_LONG_LONG)PyLong_AsUnsignedLongLong(x);
-        } else {
-            return (PY_LONG_LONG)PyLong_AsLongLong(x);
-        }
-    } else {
-        PY_LONG_LONG val;
-        PyObject *tmp = __Pyx_PyNumber_Int(x);
-        if (!tmp) return (PY_LONG_LONG)-1;
-        val = __Pyx_PyInt_AsLongLong(tmp);
-        Py_DECREF(tmp);
-        return val;
-    }
-}
-
-static CYTHON_INLINE signed long __Pyx_PyInt_AsSignedLong(PyObject* x) {
-    const signed long neg_one = (signed long)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-#if PY_VERSION_HEX < 0x03000000
-    if (likely(PyInt_Check(x))) {
-        long val = PyInt_AS_LONG(x);
-        if (is_unsigned && unlikely(val < 0)) {
-            PyErr_SetString(PyExc_OverflowError,
-                            "can't convert negative value to signed long");
-            return (signed long)-1;
-        }
-        return (signed long)val;
-    } else
-#endif
-    if (likely(PyLong_Check(x))) {
-        if (is_unsigned) {
-            if (unlikely(Py_SIZE(x) < 0)) {
-                PyErr_SetString(PyExc_OverflowError,
-                                "can't convert negative value to signed long");
-                return (signed long)-1;
-            }
-            return (signed long)PyLong_AsUnsignedLong(x);
-        } else {
-            return (signed long)PyLong_AsLong(x);
-        }
-    } else {
-        signed long val;
-        PyObject *tmp = __Pyx_PyNumber_Int(x);
-        if (!tmp) return (signed long)-1;
-        val = __Pyx_PyInt_AsSignedLong(tmp);
-        Py_DECREF(tmp);
-        return val;
-    }
-}
-
-static CYTHON_INLINE signed PY_LONG_LONG __Pyx_PyInt_AsSignedLongLong(PyObject* x) {
-    const signed PY_LONG_LONG neg_one = (signed PY_LONG_LONG)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-#if PY_VERSION_HEX < 0x03000000
-    if (likely(PyInt_Check(x))) {
-        long val = PyInt_AS_LONG(x);
-        if (is_unsigned && unlikely(val < 0)) {
-            PyErr_SetString(PyExc_OverflowError,
-                            "can't convert negative value to signed PY_LONG_LONG");
-            return (signed PY_LONG_LONG)-1;
-        }
-        return (signed PY_LONG_LONG)val;
-    } else
-#endif
-    if (likely(PyLong_Check(x))) {
-        if (is_unsigned) {
-            if (unlikely(Py_SIZE(x) < 0)) {
-                PyErr_SetString(PyExc_OverflowError,
-                                "can't convert negative value to signed PY_LONG_LONG");
-                return (signed PY_LONG_LONG)-1;
-            }
-            return (signed PY_LONG_LONG)PyLong_AsUnsignedLongLong(x);
-        } else {
-            return (signed PY_LONG_LONG)PyLong_AsLongLong(x);
-        }
-    } else {
-        signed PY_LONG_LONG val;
-        PyObject *tmp = __Pyx_PyNumber_Int(x);
-        if (!tmp) return (signed PY_LONG_LONG)-1;
-        val = __Pyx_PyInt_AsSignedLongLong(tmp);
-        Py_DECREF(tmp);
-        return val;
-    }
-}
-
-static int __Pyx_check_binary_version(void) {
-    char ctversion[4], rtversion[4];
-    PyOS_snprintf(ctversion, 4, "%d.%d", PY_MAJOR_VERSION, PY_MINOR_VERSION);
-    PyOS_snprintf(rtversion, 4, "%s", Py_GetVersion());
-    if (ctversion[0] != rtversion[0] || ctversion[2] != rtversion[2]) {
-        char message[200];
-        PyOS_snprintf(message, sizeof(message),
-                      "compiletime version %s of module '%.100s' "
-                      "does not match runtime version %s",
-                      ctversion, __Pyx_MODULE_NAME, rtversion);
-        #if PY_VERSION_HEX < 0x02050000
-        return PyErr_Warn(NULL, message);
-        #else
-        return PyErr_WarnEx(NULL, message, 1);
-        #endif
-    }
-    return 0;
-}
-
-static int __pyx_bisect_code_objects(__Pyx_CodeObjectCacheEntry* entries, int count, int code_line) {
-    int start = 0, mid = 0, end = count - 1;
-    if (end >= 0 && code_line > entries[end].code_line) {
-        return count;
-    }
-    while (start < end) {
-        mid = (start + end) / 2;
-        if (code_line < entries[mid].code_line) {
-            end = mid;
-        } else if (code_line > entries[mid].code_line) {
-             start = mid + 1;
-        } else {
-            return mid;
-        }
-    }
-    if (code_line <= entries[mid].code_line) {
-        return mid;
-    } else {
-        return mid + 1;
-    }
-}
-static PyCodeObject *__pyx_find_code_object(int code_line) {
-    PyCodeObject* code_object;
-    int pos;
-    if (unlikely(!code_line) || unlikely(!__pyx_code_cache.entries)) {
-        return NULL;
-    }
-    pos = __pyx_bisect_code_objects(__pyx_code_cache.entries, __pyx_code_cache.count, code_line);
-    if (unlikely(pos >= __pyx_code_cache.count) || unlikely(__pyx_code_cache.entries[pos].code_line != code_line)) {
-        return NULL;
-    }
-    code_object = __pyx_code_cache.entries[pos].code_object;
-    Py_INCREF(code_object);
-    return code_object;
-}
-static void __pyx_insert_code_object(int code_line, PyCodeObject* code_object) {
-    int pos, i;
-    __Pyx_CodeObjectCacheEntry* entries = __pyx_code_cache.entries;
-    if (unlikely(!code_line)) {
-        return;
-    }
-    if (unlikely(!entries)) {
-        entries = (__Pyx_CodeObjectCacheEntry*)PyMem_Malloc(64*sizeof(__Pyx_CodeObjectCacheEntry));
-        if (likely(entries)) {
-            __pyx_code_cache.entries = entries;
-            __pyx_code_cache.max_count = 64;
-            __pyx_code_cache.count = 1;
-            entries[0].code_line = code_line;
-            entries[0].code_object = code_object;
-            Py_INCREF(code_object);
-        }
-        return;
-    }
-    pos = __pyx_bisect_code_objects(__pyx_code_cache.entries, __pyx_code_cache.count, code_line);
-    if ((pos < __pyx_code_cache.count) && unlikely(__pyx_code_cache.entries[pos].code_line == code_line)) {
-        PyCodeObject* tmp = entries[pos].code_object;
-        entries[pos].code_object = code_object;
-        Py_DECREF(tmp);
-        return;
-    }
-    if (__pyx_code_cache.count == __pyx_code_cache.max_count) {
-        int new_max = __pyx_code_cache.max_count + 64;
-        entries = (__Pyx_CodeObjectCacheEntry*)PyMem_Realloc(
-            __pyx_code_cache.entries, new_max*sizeof(__Pyx_CodeObjectCacheEntry));
-        if (unlikely(!entries)) {
-            return;
-        }
-        __pyx_code_cache.entries = entries;
-        __pyx_code_cache.max_count = new_max;
-    }
-    for (i=__pyx_code_cache.count; i>pos; i--) {
-        entries[i] = entries[i-1];
-    }
-    entries[pos].code_line = code_line;
-    entries[pos].code_object = code_object;
-    __pyx_code_cache.count++;
-    Py_INCREF(code_object);
-}
-
-#include "compile.h"
-#include "frameobject.h"
-#include "traceback.h"
-static PyCodeObject* __Pyx_CreateCodeObjectForTraceback(
-            const char *funcname, int c_line,
-            int py_line, const char *filename) {
-    PyCodeObject *py_code = 0;
-    PyObject *py_srcfile = 0;
-    PyObject *py_funcname = 0;
-    #if PY_MAJOR_VERSION < 3
-    py_srcfile = PyString_FromString(filename);
-    #else
-    py_srcfile = PyUnicode_FromString(filename);
-    #endif
-    if (!py_srcfile) goto bad;
-    if (c_line) {
-        #if PY_MAJOR_VERSION < 3
-        py_funcname = PyString_FromFormat( "%s (%s:%d)", funcname, __pyx_cfilenm, c_line);
-        #else
-        py_funcname = PyUnicode_FromFormat( "%s (%s:%d)", funcname, __pyx_cfilenm, c_line);
-        #endif
-    }
-    else {
-        #if PY_MAJOR_VERSION < 3
-        py_funcname = PyString_FromString(funcname);
-        #else
-        py_funcname = PyUnicode_FromString(funcname);
-        #endif
-    }
-    if (!py_funcname) goto bad;
-    py_code = __Pyx_PyCode_New(
-        0,            /*int argcount,*/
-        0,            /*int kwonlyargcount,*/
-        0,            /*int nlocals,*/
-        0,            /*int stacksize,*/
-        0,            /*int flags,*/
-        __pyx_empty_bytes, /*PyObject *code,*/
-        __pyx_empty_tuple, /*PyObject *consts,*/
-        __pyx_empty_tuple, /*PyObject *names,*/
-        __pyx_empty_tuple, /*PyObject *varnames,*/
-        __pyx_empty_tuple, /*PyObject *freevars,*/
-        __pyx_empty_tuple, /*PyObject *cellvars,*/
-        py_srcfile,   /*PyObject *filename,*/
-        py_funcname,  /*PyObject *name,*/
-        py_line,      /*int firstlineno,*/
-        __pyx_empty_bytes  /*PyObject *lnotab*/
-    );
-    Py_DECREF(py_srcfile);
-    Py_DECREF(py_funcname);
-    return py_code;
-bad:
-    Py_XDECREF(py_srcfile);
-    Py_XDECREF(py_funcname);
-    return NULL;
-}
-static void __Pyx_AddTraceback(const char *funcname, int c_line,
-                               int py_line, const char *filename) {
-    PyCodeObject *py_code = 0;
-    PyObject *py_globals = 0;
-    PyFrameObject *py_frame = 0;
-    py_code = __pyx_find_code_object(c_line ? c_line : py_line);
-    if (!py_code) {
-        py_code = __Pyx_CreateCodeObjectForTraceback(
-            funcname, c_line, py_line, filename);
-        if (!py_code) goto bad;
-        __pyx_insert_code_object(c_line ? c_line : py_line, py_code);
-    }
-    py_globals = PyModule_GetDict(__pyx_m);
-    if (!py_globals) goto bad;
-    py_frame = PyFrame_New(
-        PyThreadState_GET(), /*PyThreadState *tstate,*/
-        py_code,             /*PyCodeObject *code,*/
-        py_globals,          /*PyObject *globals,*/
-        0                    /*PyObject *locals*/
-    );
-    if (!py_frame) goto bad;
-    py_frame->f_lineno = py_line;
-    PyTraceBack_Here(py_frame);
-bad:
-    Py_XDECREF(py_code);
-    Py_XDECREF(py_frame);
-}
-
-static int __Pyx_InitStrings(__Pyx_StringTabEntry *t) {
-    while (t->p) {
-        #if PY_MAJOR_VERSION < 3
-        if (t->is_unicode) {
-            *t->p = PyUnicode_DecodeUTF8(t->s, t->n - 1, NULL);
-        } else if (t->intern) {
-            *t->p = PyString_InternFromString(t->s);
-        } else {
-            *t->p = PyString_FromStringAndSize(t->s, t->n - 1);
-        }
-        #else  /* Python 3+ has unicode identifiers */
-        if (t->is_unicode | t->is_str) {
-            if (t->intern) {
-                *t->p = PyUnicode_InternFromString(t->s);
-            } else if (t->encoding) {
-                *t->p = PyUnicode_Decode(t->s, t->n - 1, t->encoding, NULL);
-            } else {
-                *t->p = PyUnicode_FromStringAndSize(t->s, t->n - 1);
-            }
-        } else {
-            *t->p = PyBytes_FromStringAndSize(t->s, t->n - 1);
-        }
-        #endif
-        if (!*t->p)
-            return -1;
-        ++t;
-    }
-    return 0;
-}
-
-
-/* Type Conversion Functions */
-
-static CYTHON_INLINE int __Pyx_PyObject_IsTrue(PyObject* x) {
-   int is_true = x == Py_True;
-   if (is_true | (x == Py_False) | (x == Py_None)) return is_true;
-   else return PyObject_IsTrue(x);
-}
-
-static CYTHON_INLINE PyObject* __Pyx_PyNumber_Int(PyObject* x) {
-  PyNumberMethods *m;
-  const char *name = NULL;
-  PyObject *res = NULL;
-#if PY_VERSION_HEX < 0x03000000
-  if (PyInt_Check(x) || PyLong_Check(x))
-#else
-  if (PyLong_Check(x))
-#endif
-    return Py_INCREF(x), x;
-  m = Py_TYPE(x)->tp_as_number;
-#if PY_VERSION_HEX < 0x03000000
-  if (m && m->nb_int) {
-    name = "int";
-    res = PyNumber_Int(x);
-  }
-  else if (m && m->nb_long) {
-    name = "long";
-    res = PyNumber_Long(x);
-  }
-#else
-  if (m && m->nb_int) {
-    name = "int";
-    res = PyNumber_Long(x);
-  }
-#endif
-  if (res) {
-#if PY_VERSION_HEX < 0x03000000
-    if (!PyInt_Check(res) && !PyLong_Check(res)) {
-#else
-    if (!PyLong_Check(res)) {
-#endif
-      PyErr_Format(PyExc_TypeError,
-                   "__%s__ returned non-%s (type %.200s)",
-                   name, name, Py_TYPE(res)->tp_name);
-      Py_DECREF(res);
-      return NULL;
-    }
-  }
-  else if (!PyErr_Occurred()) {
-    PyErr_SetString(PyExc_TypeError,
-                    "an integer is required");
-  }
-  return res;
-}
-
-static CYTHON_INLINE Py_ssize_t __Pyx_PyIndex_AsSsize_t(PyObject* b) {
-  Py_ssize_t ival;
-  PyObject* x = PyNumber_Index(b);
-  if (!x) return -1;
-  ival = PyInt_AsSsize_t(x);
-  Py_DECREF(x);
-  return ival;
-}
-
-static CYTHON_INLINE PyObject * __Pyx_PyInt_FromSize_t(size_t ival) {
-#if PY_VERSION_HEX < 0x02050000
-   if (ival <= LONG_MAX)
-       return PyInt_FromLong((long)ival);
-   else {
-       unsigned char *bytes = (unsigned char *) &ival;
-       int one = 1; int little = (int)*(unsigned char*)&one;
-       return _PyLong_FromByteArray(bytes, sizeof(size_t), little, 0);
-   }
-#else
-   return PyInt_FromSize_t(ival);
-#endif
-}
-
-static CYTHON_INLINE size_t __Pyx_PyInt_AsSize_t(PyObject* x) {
-   unsigned PY_LONG_LONG val = __Pyx_PyInt_AsUnsignedLongLong(x);
-   if (unlikely(val == (unsigned PY_LONG_LONG)-1 && PyErr_Occurred())) {
-       return (size_t)-1;
-   } else if (unlikely(val != (unsigned PY_LONG_LONG)(size_t)val)) {
-       PyErr_SetString(PyExc_OverflowError,
-                       "value too large to convert to size_t");
-       return (size_t)-1;
-   }
-   return (size_t)val;
-}
-
-
-#endif /* Py_PYTHON_H */
diff --git a/src/s3ql/_deltadump.pyx b/src/s3ql/_deltadump.pyx
deleted file mode 100644
index 091b6aa..0000000
--- a/src/s3ql/_deltadump.pyx
+++ /dev/null
@@ -1,458 +0,0 @@
-'''
-_deltadump.pyx - this file is part of S3QL (http://s3ql.googlecode.com)
-
-Copyright (C) Nikolaus Rath <Nikolaus@rath.org>
-
-This program can be distributed under the terms of the GNU GPLv3.
-'''
-
-# Analysis of Cython code not really working yet
-#@PydevCodeAnalysisIgnore
-
-from __future__ import print_function, division
-
-from cpython.long cimport PyLong_AsVoidPtr
-from cpython.exc cimport PyErr_NoMemory
-from libc.stdio cimport (FILE, const_char, const_void, fclose as fclose_c,
-                         fwrite as fwrite_c, fread as fread_c, ftell)
-from libc.string cimport strerror
-from libc.errno cimport errno
-from libc.stdlib cimport calloc as calloc_c, free as free_c
-from libc.stdint cimport (int64_t, uint8_t, uint16_t, uint32_t, uint64_t)
-from posix.unistd cimport dup, lseek, SEEK_SET
-
-cdef extern from 'stdint.h' nogil:
-    enum: UINT8_MAX
-    enum: UINT16_MAX
-    enum: UINT32_MAX
-
-cdef extern from 'stdio.h' nogil:
-    FILE * fdopen(int fd, const_char * mode)
-    int fflush(FILE * stream)
-    int fileno(FILE * stream)
-
-cdef extern from 'endian.h' nogil:
-    uint64_t htole64(uint64_t host_64bits)
-    uint64_t le64toh(uint64_t little_endian_64bits)
-
-cdef extern from 'sqlite3.h' nogil:
-    ctypedef int sqlite3
-    ctypedef int sqlite3_stmt
-    ctypedef int64_t sqlite3_int64
-
-    int sqlite3_prepare_v2(sqlite3 * db,
-                           char * zSql,
-                           int nByte,
-                           sqlite3_stmt ** ppStmt,
-                           char ** pzTail)
-    int sqlite3_step(sqlite3_stmt *)
-    sqlite3_int64 sqlite3_column_int64(sqlite3_stmt * , int iCol)
-    const_void * sqlite3_column_blob(sqlite3_stmt * , int iCol)
-    int sqlite3_column_bytes(sqlite3_stmt * , int iCol)
-    int sqlite3_bind_blob(sqlite3_stmt * , int iCol, const_void * , int n, void(*)(void *))
-    int sqlite3_bind_int64(sqlite3_stmt * , int iCol, sqlite3_int64)
-    int sqlite3_reset(sqlite3_stmt * pStmt)
-    int sqlite3_finalize(sqlite3_stmt * pStmt)
-    int sqlite3_column_type(sqlite3_stmt * , int iCol)
-    double sqlite3_column_double(sqlite3_stmt * , int iCol)
-    int sqlite3_bind_double(sqlite3_stmt * , int, double)
-
-    void SQLITE_TRANSIENT(void *)
-
-    enum:
-        SQLITE_OK
-        SQLITE_DONE
-        SQLITE_ROW
-        SQLITE_NULL
-
-from .cleanup_manager import CleanupManager
-import apsw
-import os
-import logging
-
-log = logging.getLogger('deltadump')
-
-# Column types
-cdef int _INTEGER = 1
-cdef int _BLOB = 2
-cdef int _TIME = 3
-
-# Make column types available as Python objects
-INTEGER = _INTEGER
-BLOB = _BLOB
-TIME = _TIME
-
-# Integer length codes
-cdef uint8_t INT8 = 127
-cdef uint8_t INT16 = 126
-cdef uint8_t INT32 = 125
-cdef uint8_t INT64 = 124
-
-# Maximum size of BLOBs
-MAX_BLOB_SIZE = 4096
-
-# Scale factor from time floats to integers
-# 1e9 would be perfect, but introduces rounding errors
-cdef double time_scale = 1 << 30
-
-cdef inline int fwrite(const_void * buf, size_t len_, FILE * fp) except -1:
-    '''Call libc's fwrite() and raise exception on failure'''
-
-    if fwrite_c(buf, len_, 1, fp) != 1:
-        raise IOError(errno, strerror(errno))
-
-cdef inline int fread(void * buf, size_t len_, FILE * fp) except -1:
-    '''Call libc's fread() and raise exception on failure'''
-
-    if fread_c(buf, len_, 1, fp) != 1:
-        raise IOError(errno, strerror(errno))
-
-cdef int free(void * ptr) except -1:
-    '''Call libc.free() and return None'''
-
-    free_c(ptr)
-
-cdef int sqlite3_finalize_p(sqlite3_stmt * stmt) except -1:
-    '''Call sqlite3_finalize and raise exception on failure'''
-
-    rc = sqlite3_finalize(stmt)
-    if rc != SQLITE_OK:
-        raise apsw.exceptionfor(rc)
-
-cdef int fclose(FILE * fp) except -1:
-    '''Call libc.fclose() and raise exception on failure'''
-
-    cdef ssize_t off
-
-    # Explicitly flush data that needs to be written. This is
-    # important, so that we can safely reposition the fd position
-    # below (which is necessary in case there is cached input data)
-    if fflush(fp) != 0:
-        raise OSError(errno, strerror(errno))
-    
-    # Reposition FD to position of FILE*, otherwise next read from FD will miss
-    # data currently in stream buffer. It seems that call to fflush() achieves
-    # the same thing, but this does not seem to be documented so we don't rely
-    # on it.
-    off = ftell(fp)
-    if off == -1:
-        raise OSError(errno, strerror(errno))
-
-    if lseek(fileno(fp), off, SEEK_SET) != off:
-        raise OSError(errno, strerror(errno))
-
-    if fclose_c(fp) != 0:
-        raise OSError(errno, strerror(errno))
-
-cdef void * calloc(size_t cnt, size_t size) except NULL:
-    '''Call libc.calloc and raise exception on failure'''
-
-    cdef void * ptr
-
-    ptr = calloc_c(cnt, size)
-
-    if ptr is NULL:
-        PyErr_NoMemory()
-
-    return ptr
-
-def dump_table(table, order, columns, db, fh):
-    '''Dump *columns* of *table* into *fh*
-
-    *order* specifies the order in which the rows are written and must be a
-    string that can be inserted after the "ORDER BY" clause in an SQL SELECT
-    statement.
-    
-    *db* is an `s3ql.Connection` instance for the database.
-    
-    *columns* must a list of 3-tuples, one for each column that should be
-    stored. The first element of the tuple must contain the column name and the
-    second element the type of data stored in the column (`INTEGER`, `TIME`
-    or `BLOB`). Times will be converted to nanosecond integers.
-    
-    For integers and seconds, the third tuple element specifies the expected
-    change of the values between rows. For blobs it can be either zero
-    (indicating variable length columns) or an integer specifying the length of
-    the column values in bytes.
-    '''
-
-    return _dump_or_load(table, order, columns, db, fh)
-
-def load_table(table, columns, db, fh):
-    '''Load *columns* of *table* from *fh*
-
-    Parameters are described in the docstring of the `dump_table` function.
-    '''
-
-    return _dump_or_load(table, None, columns, db, fh)
-
-
-def _dump_or_load(table, order, columns, db, fh):
-    '''Dump or load *columns* of *table*
-    
-    If *order* is None, load data from *fh* into *db*.
-    
-    If *order* is not None, data will be read from *db* and written
-    into *fh*. In this case, *order* specifies the order in which
-    the rows are written and must be a string that can be inserted
-    after the "ORDER BY" clause in an SQL SELECT statement.
-    
-    *db* is an `s3ql.Connection` instance for the database.
-    
-    *columns* must a list of 3-tuples, one for each column that should be stored
-    or retrieved. The first element of the tuple must contain the column name
-    and the second element the type of data stored in the column (`INTEGER`,
-    `TIME` or `BLOB`). Times will be converted to nanosecond integers.
-    
-    For integers and times, the third tuple element specifies the expected
-    change of the values between rows. For blobs it can be either zero
-    (indicating variable length columns) or an integer specifying the length of
-    the column values in bytes.    
-    '''
-
-    cdef sqlite3 * sqlite3_db
-    cdef sqlite3_stmt * stmt
-    cdef int * col_types, *col_args, col_count, rc, fd
-    cdef int64_t * int64_prev
-    cdef FILE * fp
-    cdef void * buf
-    cdef int64_t row_count
-
-    sqlite3_db = < sqlite3 *> PyLong_AsVoidPtr(db.conn.sqlite3pointer())
-
-    with CleanupManager(log) as cleanup:
-        fd = dup(fh.fileno())
-        if fd == -1:
-            raise OSError(errno, strerror(errno))
-        if order is None:
-            fp = fdopen(fd, 'rb')
-        else:
-            fp = fdopen(fd, 'wb')
-        if fp == NULL:
-            raise OSError(errno, strerror(errno))
-        cleanup.register(lambda: fclose(fp))
-
-        # Allocate col_args and col_types 
-        col_count = len(columns)
-        col_types = < int *> calloc(col_count, sizeof(int))
-        cleanup.register(lambda: free(col_types))
-        col_args = < int *> calloc(col_count, sizeof(int))
-        cleanup.register(lambda: free(col_args))
-
-        # Initialize col_args and col_types   
-        for i in range(col_count):
-            if columns[i][1] not in (BLOB, INTEGER, TIME):
-                raise ValueError("Invalid type for column %d" % i)
-            col_types[i] = columns[i][1]
-
-            if len(columns[i]) == 3:
-                col_args[i] = columns[i][2]
-            else:
-                col_args[i] = 0
-
-        # Allocate int64_prev
-        int64_prev = < int64_t *> calloc(len(columns), sizeof(int64_t))
-        cleanup.register(lambda: free(int64_prev))
-
-        # Prepare statement
-        col_names = [ x[0] for x in columns ]
-        if order is None:
-            query = ("INSERT INTO %s (%s) VALUES(%s)"
-                 % (table,
-                    ', '.join(col_names),
-                    ', '.join('?' * col_count)))
-        else:
-            query = ("SELECT %s FROM %s ORDER BY %s " %
-                     (', '.join(col_names), table, order))
-        rc = sqlite3_prepare_v2(sqlite3_db, query, -1, & stmt, NULL)
-        if rc != SQLITE_OK:
-            raise apsw.exceptionfor(rc)
-        cleanup.register(lambda: sqlite3_finalize_p(stmt))
-
-        # Dump or load data as requested
-        if order is None:
-            buf = calloc(MAX_BLOB_SIZE, 1)
-            cleanup.register(lambda: free(buf))
-            read_integer(& row_count, fp)
-            log.debug('_dump_or_load(%s): reading %d rows', table, row_count)
-            _load_table(col_types, col_args, int64_prev, col_count,
-                        row_count, stmt, fp, buf)
-        else:
-            row_count = db.get_val("SELECT COUNT(rowid) FROM %s" % table)
-            log.debug('_dump_or_load(%s): writing %d rows', table, row_count)
-            write_integer(row_count, fp)
-            _dump_table(col_types, col_args, int64_prev, col_count, stmt, fp)
-
-
-cdef _dump_table(int * col_types, int * col_args, int64_t * int64_prev,
-                 int col_count, sqlite3_stmt * stmt, FILE * fp):
-
-    cdef const_void * buf
-    cdef int rc, i, len_
-    cdef int64_t int64, tmp
-
-    # Iterate through rows
-    while True:
-        rc = sqlite3_step(stmt)
-        if rc == SQLITE_DONE:
-            break
-        elif rc != SQLITE_ROW:
-            raise apsw.exceptionfor(rc)
-
-        for i in range(col_count):
-            if sqlite3_column_type(stmt, i) is SQLITE_NULL:
-                raise ValueError("Can't dump NULL values")
-
-            if col_types[i] == _INTEGER:
-                int64 = sqlite3_column_int64(stmt, i)
-                tmp = int64
-                int64 -= int64_prev[i] + col_args[i]
-                int64_prev[i] = tmp
-                write_integer(int64, fp)
-
-            elif col_types[i] == _TIME:
-                int64 = < int64_t > (sqlite3_column_double(stmt, i) * time_scale)
-                tmp = int64
-                int64 -= int64_prev[i] + col_args[i]
-                int64_prev[i] = tmp
-                write_integer(int64, fp)
-
-            elif col_types[i] == _BLOB:
-                buf = sqlite3_column_blob(stmt, i)
-                len_ = sqlite3_column_bytes(stmt, i)
-                if len_ > MAX_BLOB_SIZE:
-                        raise ValueError('Can not dump BLOB of size %d (max: %d)',
-                                         len_, MAX_BLOB_SIZE)
-                if col_args[i] == 0:
-                    write_integer(len_ - int64_prev[i], fp)
-                    int64_prev[i] = len_
-                elif len_ != col_args[i]:
-                    raise ValueError("Length %d != %d in column %d" % (len_, col_args[i], i))
-
-                if len_ != 0:
-                    fwrite(buf, len_, fp)
-
-cdef _load_table(int * col_types, int * col_args, int64_t * int64_prev,
-                 int col_count, int row_count, sqlite3_stmt * stmt,
-                 FILE * fp, void * buf):
-
-    cdef int64_t int64
-    cdef int rc, len_, i, j
-
-    # Iterate through rows
-    for i in range(row_count):
-        for j in range(col_count):
-            if col_types[j] == _INTEGER:
-                read_integer(& int64, fp)
-                int64 += col_args[j] + int64_prev[j]
-                int64_prev[j] = int64
-                rc = sqlite3_bind_int64(stmt, j + 1, int64)
-                if rc != SQLITE_OK:
-                    raise apsw.exceptionfor(rc)
-
-            if col_types[j] == _TIME:
-                read_integer(& int64, fp)
-                int64 += col_args[j] + int64_prev[j]
-                int64_prev[j] = int64
-                rc = sqlite3_bind_double(stmt, j + 1, int64 / time_scale)
-                if rc != SQLITE_OK:
-                    raise apsw.exceptionfor(rc)
-
-            elif col_types[j] == _BLOB:
-                if col_args[j] == 0:
-                    read_integer(& int64, fp)
-                    len_ = int64_prev[j] + int64
-                    int64_prev[j] = len_
-                else:
-                    len_ = col_args[j]
-
-                if len_ > MAX_BLOB_SIZE:
-                    raise RuntimeError('BLOB too large to read (%d vs %d)', len_, MAX_BLOB_SIZE)
-
-                if len_ != 0:
-                    fread(buf, len_, fp)
-
-                rc = sqlite3_bind_blob(stmt, j + 1, buf, len_, SQLITE_TRANSIENT)
-                if rc != SQLITE_OK:
-                    raise apsw.exceptionfor(rc)
-
-        rc = sqlite3_step(stmt)
-        if rc != SQLITE_DONE:
-            raise apsw.exceptionfor(rc)
-
-        rc = sqlite3_reset(stmt)
-        if rc != SQLITE_OK:
-            raise apsw.exceptionfor(rc)
-
-cdef inline int write_integer(int64_t int64, FILE * fp) except -1:
-    '''Write *int64* into *fp*, using as little space as possible'''
-
-    cdef uint8_t int8
-    cdef size_t len_
-    cdef uint64_t uint64
-
-    if int64 < 0:
-        uint64 = < uint64_t > -int64
-        int8 = < uint8_t > 0x80 # Highest bit set
-    else:
-        uint64 = < uint64_t > int64
-        int8 = 0
-
-    if uint64 < 0x80 and uint64 not in (INT8, INT16, INT32, INT64):
-        len_ = 0
-        int8 += < uint8_t > uint64
-    elif uint64 < UINT8_MAX:
-        len_ = 1
-        int8 += INT8
-    elif uint64 < UINT16_MAX:
-        len_ = 2
-        int8 += INT16
-    elif uint64 < UINT32_MAX:
-        len_ = 4
-        int8 += INT32
-    else:
-        len_ = 8
-        int8 += INT64
-
-    fwrite(& int8, 1, fp)
-    if len_ != 0:
-        uint64 = htole64(uint64)
-        fwrite(& uint64, len_, fp)
-
-cdef inline int read_integer(int64_t * out, FILE * fp) except -1:
-    '''Read integer written using `write_integer` from *fp*'''
-
-    cdef uint8_t int8
-    cdef size_t len_
-    cdef uint64_t uint64
-    cdef char negative
-
-    fread(& int8, 1, fp)
-
-    if int8 & 0x80 != 0:
-        negative = 1
-        int8 = int8 & (~0x80)
-    else:
-        negative = 0
-
-    if int8 == INT8:
-        len_ = 1
-    elif int8 == INT16:
-        len_ = 2
-    elif int8 == INT32:
-        len_ = 4
-    elif int8 == INT64:
-        len_ = 8
-    else:
-        len_ = 0
-        uint64 = int8
-
-    if len_ != 0:
-        uint64 = 0
-        fread(& uint64, len_, fp)
-        uint64 = le64toh(uint64)
-
-    if negative == 1:
-        out[0] = - < int64_t > uint64
-    else:
-        out[0] = < int64_t > uint64
diff --git a/src/s3ql/adm.py b/src/s3ql/adm.py
index b594c25..b4fdfaa 100644
--- a/src/s3ql/adm.py
+++ b/src/s3ql/adm.py
@@ -147,26 +147,16 @@ def download_metadata(backend, storage_url):
             raise QuietError('%s already exists, aborting.' % cachepath + i)
 
     param = backend.lookup(name)
-    try:
-        log.info('Downloading and decompressing %s...', name)
-        def do_read(fh):
-            tmpfh = tempfile.TemporaryFile()
-            stream_read_bz2(fh, tmpfh)
-            return tmpfh
-        tmpfh = backend.perform_read(do_read, name)
-        os.close(os.open(cachepath + '.db.tmp', os.O_RDWR | os.O_CREAT | os.O_TRUNC,
-                         stat.S_IRUSR | stat.S_IWUSR))
-        db = Connection(cachepath + '.db.tmp', fast_mode=True)
-        log.info("Reading metadata...")
-        tmpfh.seek(0)
-        restore_metadata(tmpfh, db)
-        db.close()
-        os.rename(cachepath + '.db.tmp', cachepath + '.db')
+    log.info('Downloading and decompressing %s...', name)
+    def do_read(fh):
+        tmpfh = tempfile.TemporaryFile()
+        stream_read_bz2(fh, tmpfh)
+        return tmpfh
+    tmpfh = backend.perform_read(do_read, name)
 
-    except:
-        # Don't keep file if it doesn't contain anything sensible
-        os.unlink(cachepath + '.db.tmp')
-        raise
+    log.info("Reading metadata...")
+    tmpfh.seek(0)
+    restore_metadata(tmpfh, cachepath + '.db')
 
     # Raise sequence number so that fsck.s3ql actually uses the
     # downloaded backup
@@ -323,16 +313,10 @@ def upgrade(backend, cachepath):
             stream_read_bz2(fh, tmpfh)
             return tmpfh
         tmpfh = backend.perform_read(do_read, "s3ql_metadata")
-        os.close(os.open(cachepath + '.db.tmp', os.O_RDWR | os.O_CREAT | os.O_TRUNC,
-                         stat.S_IRUSR | stat.S_IWUSR))
-        db = Connection(cachepath + '.db.tmp', fast_mode=True)
+
         log.info("Reading metadata...")
         tmpfh.seek(0)
-        restore_metadata(tmpfh, db)
-        db.close()
-        os.rename(cachepath + '.db.tmp', cachepath + '.db')
-        db = Connection(cachepath + '.db')
-
+        db = restore_metadata(tmpfh, cachepath + '.db')
 
     log.info('Upgrading from revision %d to %d...', param['revision'], CURRENT_FS_REV)
 
diff --git a/src/s3ql/block_cache.py b/src/s3ql/block_cache.py
index faf5a85..dd4632c 100644
--- a/src/s3ql/block_cache.py
+++ b/src/s3ql/block_cache.py
@@ -7,7 +7,7 @@ This program can be distributed under the terms of the GNU GPLv3.
 '''
 
 from __future__ import division, print_function, absolute_import
-from .common import sha256_fh, BUFSIZE, QuietError
+from .common import sha256_fh, BUFSIZE
 from .database import NoSuchRowError
 from .ordered_dict import OrderedDict
 from Queue import Queue
@@ -18,7 +18,6 @@ import os
 import shutil
 import threading
 import time
-from .backends.common import NoSuchObject
 
 # standard logger for this module
 log = logging.getLogger("BlockCache")
@@ -545,11 +544,6 @@ class BlockCache(object):
                         el.dirty = False
                         self.size += el.size
 
-                    except NoSuchObject:
-                        raise QuietError('Backend claims that object %d does not exist, data '
-                                         'may be corrupted or inconsisten. fsck required.'
-                                         % obj_id)
-                        
                     except:
                         if el is not None:
                             el.unlink()
diff --git a/src/s3ql/common.py b/src/s3ql/common.py
index 6831b44..80fde6d 100644
--- a/src/s3ql/common.py
+++ b/src/s3ql/common.py
@@ -52,6 +52,8 @@ def setup_logging(options):
         root_logger.setLevel(logging.INFO)
         logging.disable(logging.DEBUG)
 
+    logging.captureWarnings(capture=True)
+    
     return stdout_handler
 
 
diff --git a/src/s3ql/database.py b/src/s3ql/database.py
index b571cb3..b9d9c51 100644
--- a/src/s3ql/database.py
+++ b/src/s3ql/database.py
@@ -28,7 +28,19 @@ sqlite_ver = tuple([ int(x) for x in apsw.sqlitelibversion().split('.') ])
 if sqlite_ver < (3, 7, 0):
     raise QuietError('SQLite version too old, must be 3.7.0 or newer!\n')
 
-initsql = ('PRAGMA foreign_keys = OFF',
+            
+initsql = (
+           # WAL mode causes trouble with e.g. copy_tree, so we don't use it at the moment
+           # (cf. http://article.gmane.org/gmane.comp.db.sqlite.general/65243). 
+           # However, if we start using it we must initiaze it *before* setting 
+           # locking_mode to EXCLUSIVE, otherwise we can't switch the locking
+           # mode without first disabling WAL.
+           'PRAGMA synchronous = OFF',
+           'PRAGMA journal_mode = OFF',
+           #'PRAGMA synchronous = NORMAL',
+           #'PRAGMA journal_mode = WAL',
+           
+           'PRAGMA foreign_keys = OFF',
            'PRAGMA locking_mode = EXCLUSIVE',
            'PRAGMA recursize_triggers = on',
            'PRAGMA page_size = 4096',
@@ -63,36 +75,15 @@ class Connection(object):
                the cursor when they return)
     '''
 
-    def __init__(self, file_, fast_mode=False):
+    def __init__(self, file_):
         self.conn = apsw.Connection(file_)
         self.file = file_
 
         cur = self.conn.cursor()
+
         for s in initsql:
             cur.execute(s)
 
-        self.fast_mode(fast_mode)
-
-    def fast_mode(self, on):
-        '''Switch to fast, but insecure mode
-        
-        In fast mode, SQLite operates as quickly as possible, but
-        application and system crashes may lead to data corruption.
-        '''
-
-        # WAL mode causes trouble with e.g. copy_tree, so we
-        # always disable WAL for now. See 
-        # http://article.gmane.org/gmane.comp.db.sqlite.general/65243
-        on = True
-        cur = self.conn.cursor()
-        if on:
-            cur.execute('PRAGMA synchronous = OFF')
-            cur.execute('PRAGMA journal_mode = OFF')
-        else:
-            cur.execute('PRAGMA synchronous = NORMAL')
-            cur.execute('PRAGMA journal_mode = WAL')
-
-
     def close(self):
         self.conn.close()
 
diff --git a/src/s3ql/deltadump.c b/src/s3ql/deltadump.c
new file mode 100644
index 0000000..52d4c47
--- /dev/null
+++ b/src/s3ql/deltadump.c
@@ -0,0 +1,9703 @@
+/* Generated by Cython 0.19.1 on Mon May 27 20:20:03 2013 */
+
+#define PY_SSIZE_T_CLEAN
+#ifndef CYTHON_USE_PYLONG_INTERNALS
+#ifdef PYLONG_BITS_IN_DIGIT
+#define CYTHON_USE_PYLONG_INTERNALS 0
+#else
+#include "pyconfig.h"
+#ifdef PYLONG_BITS_IN_DIGIT
+#define CYTHON_USE_PYLONG_INTERNALS 1
+#else
+#define CYTHON_USE_PYLONG_INTERNALS 0
+#endif
+#endif
+#endif
+#include "Python.h"
+#ifndef Py_PYTHON_H
+    #error Python headers needed to compile C extensions, please install development version of Python.
+#elif PY_VERSION_HEX < 0x02040000
+    #error Cython requires Python 2.4+.
+#else
+#include <stddef.h> /* For offsetof */
+#ifndef offsetof
+#define offsetof(type, member) ( (size_t) & ((type*)0) -> member )
+#endif
+#if !defined(WIN32) && !defined(MS_WINDOWS)
+  #ifndef __stdcall
+    #define __stdcall
+  #endif
+  #ifndef __cdecl
+    #define __cdecl
+  #endif
+  #ifndef __fastcall
+    #define __fastcall
+  #endif
+#endif
+#ifndef DL_IMPORT
+  #define DL_IMPORT(t) t
+#endif
+#ifndef DL_EXPORT
+  #define DL_EXPORT(t) t
+#endif
+#ifndef PY_LONG_LONG
+  #define PY_LONG_LONG LONG_LONG
+#endif
+#ifndef Py_HUGE_VAL
+  #define Py_HUGE_VAL HUGE_VAL
+#endif
+#ifdef PYPY_VERSION
+#define CYTHON_COMPILING_IN_PYPY 1
+#define CYTHON_COMPILING_IN_CPYTHON 0
+#else
+#define CYTHON_COMPILING_IN_PYPY 0
+#define CYTHON_COMPILING_IN_CPYTHON 1
+#endif
+#if PY_VERSION_HEX < 0x02050000
+  typedef int Py_ssize_t;
+  #define PY_SSIZE_T_MAX INT_MAX
+  #define PY_SSIZE_T_MIN INT_MIN
+  #define PY_FORMAT_SIZE_T ""
+  #define CYTHON_FORMAT_SSIZE_T ""
+  #define PyInt_FromSsize_t(z) PyInt_FromLong(z)
+  #define PyInt_AsSsize_t(o)   __Pyx_PyInt_AsInt(o)
+  #define PyNumber_Index(o)    ((PyNumber_Check(o) && !PyFloat_Check(o)) ? PyNumber_Int(o) : \
+                                (PyErr_Format(PyExc_TypeError, \
+                                              "expected index value, got %.200s", Py_TYPE(o)->tp_name), \
+                                 (PyObject*)0))
+  #define __Pyx_PyIndex_Check(o) (PyNumber_Check(o) && !PyFloat_Check(o) && \
+                                  !PyComplex_Check(o))
+  #define PyIndex_Check __Pyx_PyIndex_Check
+  #define PyErr_WarnEx(category, message, stacklevel) PyErr_Warn(category, message)
+  #define __PYX_BUILD_PY_SSIZE_T "i"
+#else
+  #define __PYX_BUILD_PY_SSIZE_T "n"
+  #define CYTHON_FORMAT_SSIZE_T "z"
+  #define __Pyx_PyIndex_Check PyIndex_Check
+#endif
+#if PY_VERSION_HEX < 0x02060000
+  #define Py_REFCNT(ob) (((PyObject*)(ob))->ob_refcnt)
+  #define Py_TYPE(ob)   (((PyObject*)(ob))->ob_type)
+  #define Py_SIZE(ob)   (((PyVarObject*)(ob))->ob_size)
+  #define PyVarObject_HEAD_INIT(type, size) \
+          PyObject_HEAD_INIT(type) size,
+  #define PyType_Modified(t)
+  typedef struct {
+     void *buf;
+     PyObject *obj;
+     Py_ssize_t len;
+     Py_ssize_t itemsize;
+     int readonly;
+     int ndim;
+     char *format;
+     Py_ssize_t *shape;
+     Py_ssize_t *strides;
+     Py_ssize_t *suboffsets;
+     void *internal;
+  } Py_buffer;
+  #define PyBUF_SIMPLE 0
+  #define PyBUF_WRITABLE 0x0001
+  #define PyBUF_FORMAT 0x0004
+  #define PyBUF_ND 0x0008
+  #define PyBUF_STRIDES (0x0010 | PyBUF_ND)
+  #define PyBUF_C_CONTIGUOUS (0x0020 | PyBUF_STRIDES)
+  #define PyBUF_F_CONTIGUOUS (0x0040 | PyBUF_STRIDES)
+  #define PyBUF_ANY_CONTIGUOUS (0x0080 | PyBUF_STRIDES)
+  #define PyBUF_INDIRECT (0x0100 | PyBUF_STRIDES)
+  #define PyBUF_RECORDS (PyBUF_STRIDES | PyBUF_FORMAT | PyBUF_WRITABLE)
+  #define PyBUF_FULL (PyBUF_INDIRECT | PyBUF_FORMAT | PyBUF_WRITABLE)
+  typedef int (*getbufferproc)(PyObject *, Py_buffer *, int);
+  typedef void (*releasebufferproc)(PyObject *, Py_buffer *);
+#endif
+#if PY_MAJOR_VERSION < 3
+  #define __Pyx_BUILTIN_MODULE_NAME "__builtin__"
+  #define __Pyx_PyCode_New(a, k, l, s, f, code, c, n, v, fv, cell, fn, name, fline, lnos) \
+          PyCode_New(a, l, s, f, code, c, n, v, fv, cell, fn, name, fline, lnos)
+#else
+  #define __Pyx_BUILTIN_MODULE_NAME "builtins"
+  #define __Pyx_PyCode_New(a, k, l, s, f, code, c, n, v, fv, cell, fn, name, fline, lnos) \
+          PyCode_New(a, k, l, s, f, code, c, n, v, fv, cell, fn, name, fline, lnos)
+#endif
+#if PY_MAJOR_VERSION < 3 && PY_MINOR_VERSION < 6
+  #define PyUnicode_FromString(s) PyUnicode_Decode(s, strlen(s), "UTF-8", "strict")
+#endif
+#if PY_MAJOR_VERSION >= 3
+  #define Py_TPFLAGS_CHECKTYPES 0
+  #define Py_TPFLAGS_HAVE_INDEX 0
+#endif
+#if (PY_VERSION_HEX < 0x02060000) || (PY_MAJOR_VERSION >= 3)
+  #define Py_TPFLAGS_HAVE_NEWBUFFER 0
+#endif
+#if PY_VERSION_HEX < 0x02060000
+  #define Py_TPFLAGS_HAVE_VERSION_TAG 0
+#endif
+#if PY_VERSION_HEX > 0x03030000 && defined(PyUnicode_KIND)
+  #define CYTHON_PEP393_ENABLED 1
+  #define __Pyx_PyUnicode_READY(op)       (likely(PyUnicode_IS_READY(op)) ? \
+                                              0 : _PyUnicode_Ready((PyObject *)(op)))
+  #define __Pyx_PyUnicode_GET_LENGTH(u)   PyUnicode_GET_LENGTH(u)
+  #define __Pyx_PyUnicode_READ_CHAR(u, i) PyUnicode_READ_CHAR(u, i)
+  #define __Pyx_PyUnicode_READ(k, d, i)   PyUnicode_READ(k, d, i)
+#else
+  #define CYTHON_PEP393_ENABLED 0
+  #define __Pyx_PyUnicode_READY(op)       (0)
+  #define __Pyx_PyUnicode_GET_LENGTH(u)   PyUnicode_GET_SIZE(u)
+  #define __Pyx_PyUnicode_READ_CHAR(u, i) ((Py_UCS4)(PyUnicode_AS_UNICODE(u)[i]))
+  #define __Pyx_PyUnicode_READ(k, d, i)   ((k=k), (Py_UCS4)(((Py_UNICODE*)d)[i]))
+#endif
+#if PY_MAJOR_VERSION >= 3
+  #define PyBaseString_Type            PyUnicode_Type
+  #define PyStringObject               PyUnicodeObject
+  #define PyString_Type                PyUnicode_Type
+  #define PyString_Check               PyUnicode_Check
+  #define PyString_CheckExact          PyUnicode_CheckExact
+#endif
+#if PY_VERSION_HEX < 0x02060000
+  #define PyBytesObject                PyStringObject
+  #define PyBytes_Type                 PyString_Type
+  #define PyBytes_Check                PyString_Check
+  #define PyBytes_CheckExact           PyString_CheckExact
+  #define PyBytes_FromString           PyString_FromString
+  #define PyBytes_FromStringAndSize    PyString_FromStringAndSize
+  #define PyBytes_FromFormat           PyString_FromFormat
+  #define PyBytes_DecodeEscape         PyString_DecodeEscape
+  #define PyBytes_AsString             PyString_AsString
+  #define PyBytes_AsStringAndSize      PyString_AsStringAndSize
+  #define PyBytes_Size                 PyString_Size
+  #define PyBytes_AS_STRING            PyString_AS_STRING
+  #define PyBytes_GET_SIZE             PyString_GET_SIZE
+  #define PyBytes_Repr                 PyString_Repr
+  #define PyBytes_Concat               PyString_Concat
+  #define PyBytes_ConcatAndDel         PyString_ConcatAndDel
+#endif
+#if PY_MAJOR_VERSION >= 3
+  #define __Pyx_PyBaseString_Check(obj) PyUnicode_Check(obj)
+  #define __Pyx_PyBaseString_CheckExact(obj) PyUnicode_CheckExact(obj)
+#else
+  #define __Pyx_PyBaseString_Check(obj) (PyString_CheckExact(obj) || PyUnicode_CheckExact(obj) || \
+                                         PyString_Check(obj) || PyUnicode_Check(obj))
+  #define __Pyx_PyBaseString_CheckExact(obj) (Py_TYPE(obj) == &PyBaseString_Type)
+#endif
+#if PY_VERSION_HEX < 0x02060000
+  #define PySet_Check(obj)             PyObject_TypeCheck(obj, &PySet_Type)
+  #define PyFrozenSet_Check(obj)       PyObject_TypeCheck(obj, &PyFrozenSet_Type)
+#endif
+#ifndef PySet_CheckExact
+  #define PySet_CheckExact(obj)        (Py_TYPE(obj) == &PySet_Type)
+#endif
+#define __Pyx_TypeCheck(obj, type) PyObject_TypeCheck(obj, (PyTypeObject *)type)
+#if PY_MAJOR_VERSION >= 3
+  #define PyIntObject                  PyLongObject
+  #define PyInt_Type                   PyLong_Type
+  #define PyInt_Check(op)              PyLong_Check(op)
+  #define PyInt_CheckExact(op)         PyLong_CheckExact(op)
+  #define PyInt_FromString             PyLong_FromString
+  #define PyInt_FromUnicode            PyLong_FromUnicode
+  #define PyInt_FromLong               PyLong_FromLong
+  #define PyInt_FromSize_t             PyLong_FromSize_t
+  #define PyInt_FromSsize_t            PyLong_FromSsize_t
+  #define PyInt_AsLong                 PyLong_AsLong
+  #define PyInt_AS_LONG                PyLong_AS_LONG
+  #define PyInt_AsSsize_t              PyLong_AsSsize_t
+  #define PyInt_AsUnsignedLongMask     PyLong_AsUnsignedLongMask
+  #define PyInt_AsUnsignedLongLongMask PyLong_AsUnsignedLongLongMask
+#endif
+#if PY_MAJOR_VERSION >= 3
+  #define PyBoolObject                 PyLongObject
+#endif
+#if PY_VERSION_HEX < 0x03020000
+  typedef long Py_hash_t;
+  #define __Pyx_PyInt_FromHash_t PyInt_FromLong
+  #define __Pyx_PyInt_AsHash_t   PyInt_AsLong
+#else
+  #define __Pyx_PyInt_FromHash_t PyInt_FromSsize_t
+  #define __Pyx_PyInt_AsHash_t   PyInt_AsSsize_t
+#endif
+#if (PY_MAJOR_VERSION < 3) || (PY_VERSION_HEX >= 0x03010300)
+  #define __Pyx_PySequence_GetSlice(obj, a, b) PySequence_GetSlice(obj, a, b)
+  #define __Pyx_PySequence_SetSlice(obj, a, b, value) PySequence_SetSlice(obj, a, b, value)
+  #define __Pyx_PySequence_DelSlice(obj, a, b) PySequence_DelSlice(obj, a, b)
+#else
+  #define __Pyx_PySequence_GetSlice(obj, a, b) (unlikely(!(obj)) ? \
+        (PyErr_SetString(PyExc_SystemError, "null argument to internal routine"), (PyObject*)0) : \
+        (likely((obj)->ob_type->tp_as_mapping) ? (PySequence_GetSlice(obj, a, b)) : \
+            (PyErr_Format(PyExc_TypeError, "'%.200s' object is unsliceable", (obj)->ob_type->tp_name), (PyObject*)0)))
+  #define __Pyx_PySequence_SetSlice(obj, a, b, value) (unlikely(!(obj)) ? \
+        (PyErr_SetString(PyExc_SystemError, "null argument to internal routine"), -1) : \
+        (likely((obj)->ob_type->tp_as_mapping) ? (PySequence_SetSlice(obj, a, b, value)) : \
+            (PyErr_Format(PyExc_TypeError, "'%.200s' object doesn't support slice assignment", (obj)->ob_type->tp_name), -1)))
+  #define __Pyx_PySequence_DelSlice(obj, a, b) (unlikely(!(obj)) ? \
+        (PyErr_SetString(PyExc_SystemError, "null argument to internal routine"), -1) : \
+        (likely((obj)->ob_type->tp_as_mapping) ? (PySequence_DelSlice(obj, a, b)) : \
+            (PyErr_Format(PyExc_TypeError, "'%.200s' object doesn't support slice deletion", (obj)->ob_type->tp_name), -1)))
+#endif
+#if PY_MAJOR_VERSION >= 3
+  #define PyMethod_New(func, self, klass) ((self) ? PyMethod_New(func, self) : PyInstanceMethod_New(func))
+#endif
+#if PY_VERSION_HEX < 0x02050000
+  #define __Pyx_GetAttrString(o,n)   PyObject_GetAttrString((o),((char *)(n)))
+  #define __Pyx_SetAttrString(o,n,a) PyObject_SetAttrString((o),((char *)(n)),(a))
+  #define __Pyx_DelAttrString(o,n)   PyObject_DelAttrString((o),((char *)(n)))
+#else
+  #define __Pyx_GetAttrString(o,n)   PyObject_GetAttrString((o),(n))
+  #define __Pyx_SetAttrString(o,n,a) PyObject_SetAttrString((o),(n),(a))
+  #define __Pyx_DelAttrString(o,n)   PyObject_DelAttrString((o),(n))
+#endif
+#if PY_VERSION_HEX < 0x02050000
+  #define __Pyx_NAMESTR(n) ((char *)(n))
+  #define __Pyx_DOCSTR(n)  ((char *)(n))
+#else
+  #define __Pyx_NAMESTR(n) (n)
+  #define __Pyx_DOCSTR(n)  (n)
+#endif
+#ifndef CYTHON_INLINE
+  #if defined(__GNUC__)
+    #define CYTHON_INLINE __inline__
+  #elif defined(_MSC_VER)
+    #define CYTHON_INLINE __inline
+  #elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+    #define CYTHON_INLINE inline
+  #else
+    #define CYTHON_INLINE
+  #endif
+#endif
+#ifndef CYTHON_RESTRICT
+  #if defined(__GNUC__)
+    #define CYTHON_RESTRICT __restrict__
+  #elif defined(_MSC_VER)
+    #define CYTHON_RESTRICT __restrict
+  #elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+    #define CYTHON_RESTRICT restrict
+  #else
+    #define CYTHON_RESTRICT
+  #endif
+#endif
+#ifdef NAN
+#define __PYX_NAN() ((float) NAN)
+#else
+static CYTHON_INLINE float __PYX_NAN() {
+  /* Initialize NaN. The sign is irrelevant, an exponent with all bits 1 and
+   a nonzero mantissa means NaN. If the first bit in the mantissa is 1, it is
+   a quiet NaN. */
+  float value;
+  memset(&value, 0xFF, sizeof(value));
+  return value;
+}
+#endif
+
+
+#if PY_MAJOR_VERSION >= 3
+  #define __Pyx_PyNumber_Divide(x,y)         PyNumber_TrueDivide(x,y)
+  #define __Pyx_PyNumber_InPlaceDivide(x,y)  PyNumber_InPlaceTrueDivide(x,y)
+#else
+  #define __Pyx_PyNumber_Divide(x,y)         PyNumber_TrueDivide(x,y)
+  #define __Pyx_PyNumber_InPlaceDivide(x,y)  PyNumber_InPlaceTrueDivide(x,y)
+#endif
+
+#ifndef __PYX_EXTERN_C
+  #ifdef __cplusplus
+    #define __PYX_EXTERN_C extern "C"
+  #else
+    #define __PYX_EXTERN_C extern
+  #endif
+#endif
+
+#if defined(WIN32) || defined(MS_WINDOWS)
+#define _USE_MATH_DEFINES
+#endif
+#include <math.h>
+#define __PYX_HAVE__s3ql__deltadump
+#define __PYX_HAVE_API__s3ql__deltadump
+#include "string.h"
+#include "stdio.h"
+#include "pythread.h"
+#include "errno.h"
+#include "stdlib.h"
+#include "stdint.h"
+#include "unistd.h"
+#include "endian.h"
+#include "sqlite3.h"
+#ifdef _OPENMP
+#include <omp.h>
+#endif /* _OPENMP */
+
+#ifdef PYREX_WITHOUT_ASSERTIONS
+#define CYTHON_WITHOUT_ASSERTIONS
+#endif
+
+#ifndef CYTHON_UNUSED
+# if defined(__GNUC__)
+#   if !(defined(__cplusplus)) || (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
+#     define CYTHON_UNUSED __attribute__ ((__unused__))
+#   else
+#     define CYTHON_UNUSED
+#   endif
+# elif defined(__ICC) || (defined(__INTEL_COMPILER) && !defined(_MSC_VER))
+#   define CYTHON_UNUSED __attribute__ ((__unused__))
+# else
+#   define CYTHON_UNUSED
+# endif
+#endif
+typedef struct {PyObject **p; char *s; const Py_ssize_t n; const char* encoding;
+                const char is_unicode; const char is_str; const char intern; } __Pyx_StringTabEntry; /*proto*/
+
+#define __PYX_DEFAULT_STRING_ENCODING_IS_ASCII 0
+#define __PYX_DEFAULT_STRING_ENCODING_IS_DEFAULT 0
+#define __PYX_DEFAULT_STRING_ENCODING ""
+#define __Pyx_PyObject_FromString __Pyx_PyBytes_FromString
+#define __Pyx_PyObject_FromStringAndSize __Pyx_PyBytes_FromStringAndSize
+static CYTHON_INLINE char* __Pyx_PyObject_AsString(PyObject*);
+static CYTHON_INLINE char* __Pyx_PyObject_AsStringAndSize(PyObject*, Py_ssize_t* length);
+#define __Pyx_PyBytes_FromString        PyBytes_FromString
+#define __Pyx_PyBytes_FromStringAndSize PyBytes_FromStringAndSize
+static CYTHON_INLINE PyObject* __Pyx_PyUnicode_FromString(char*);
+#if PY_MAJOR_VERSION < 3
+    #define __Pyx_PyStr_FromString        __Pyx_PyBytes_FromString
+    #define __Pyx_PyStr_FromStringAndSize __Pyx_PyBytes_FromStringAndSize
+#else
+    #define __Pyx_PyStr_FromString        __Pyx_PyUnicode_FromString
+    #define __Pyx_PyStr_FromStringAndSize __Pyx_PyUnicode_FromStringAndSize
+#endif
+#define __Pyx_PyObject_AsUString(s)    ((unsigned char*) __Pyx_PyObject_AsString(s))
+#define __Pyx_PyObject_FromUString(s)  __Pyx_PyObject_FromString((char*)s)
+#define __Pyx_PyBytes_FromUString(s)   __Pyx_PyBytes_FromString((char*)s)
+#define __Pyx_PyStr_FromUString(s)     __Pyx_PyStr_FromString((char*)s)
+#define __Pyx_PyUnicode_FromUString(s) __Pyx_PyUnicode_FromString((char*)s)
+#if PY_MAJOR_VERSION < 3
+static CYTHON_INLINE size_t __Pyx_Py_UNICODE_strlen(const Py_UNICODE *u)
+{
+    const Py_UNICODE *u_end = u;
+    while (*u_end++) ;
+    return u_end - u - 1;
+}
+#else
+#define __Pyx_Py_UNICODE_strlen Py_UNICODE_strlen
+#endif
+#define __Pyx_PyUnicode_FromUnicode(u)       PyUnicode_FromUnicode(u, __Pyx_Py_UNICODE_strlen(u))
+#define __Pyx_PyUnicode_FromUnicodeAndLength PyUnicode_FromUnicode
+#define __Pyx_PyUnicode_AsUnicode            PyUnicode_AsUnicode
+#define __Pyx_Owned_Py_None(b) (Py_INCREF(Py_None), Py_None)
+#define __Pyx_PyBool_FromLong(b) ((b) ? (Py_INCREF(Py_True), Py_True) : (Py_INCREF(Py_False), Py_False))
+static CYTHON_INLINE int __Pyx_PyObject_IsTrue(PyObject*);
+static CYTHON_INLINE PyObject* __Pyx_PyNumber_Int(PyObject* x);
+static CYTHON_INLINE Py_ssize_t __Pyx_PyIndex_AsSsize_t(PyObject*);
+static CYTHON_INLINE PyObject * __Pyx_PyInt_FromSize_t(size_t);
+static CYTHON_INLINE size_t __Pyx_PyInt_AsSize_t(PyObject*);
+#if CYTHON_COMPILING_IN_CPYTHON
+#define __pyx_PyFloat_AsDouble(x) (PyFloat_CheckExact(x) ? PyFloat_AS_DOUBLE(x) : PyFloat_AsDouble(x))
+#else
+#define __pyx_PyFloat_AsDouble(x) PyFloat_AsDouble(x)
+#endif
+#define __pyx_PyFloat_AsFloat(x) ((float) __pyx_PyFloat_AsDouble(x))
+#if PY_MAJOR_VERSION < 3 && __PYX_DEFAULT_STRING_ENCODING_IS_ASCII
+static int __Pyx_sys_getdefaultencoding_not_ascii;
+static int __Pyx_init_sys_getdefaultencoding_params() {
+    PyObject* sys = NULL;
+    PyObject* default_encoding = NULL;
+    PyObject* ascii_chars_u = NULL;
+    PyObject* ascii_chars_b = NULL;
+    sys = PyImport_ImportModule("sys");
+    if (sys == NULL) goto bad;
+    default_encoding = PyObject_CallMethod(sys, (char*) (const char*) "getdefaultencoding", NULL);
+    if (default_encoding == NULL) goto bad;
+    if (strcmp(PyBytes_AsString(default_encoding), "ascii") == 0) {
+        __Pyx_sys_getdefaultencoding_not_ascii = 0;
+    } else {
+        const char* default_encoding_c = PyBytes_AS_STRING(default_encoding);
+        char ascii_chars[128];
+        int c;
+        for (c = 0; c < 128; c++) {
+            ascii_chars[c] = c;
+        }
+        __Pyx_sys_getdefaultencoding_not_ascii = 1;
+        ascii_chars_u = PyUnicode_DecodeASCII(ascii_chars, 128, NULL);
+        if (ascii_chars_u == NULL) goto bad;
+        ascii_chars_b = PyUnicode_AsEncodedString(ascii_chars_u, default_encoding_c, NULL);
+        if (ascii_chars_b == NULL || strncmp(ascii_chars, PyBytes_AS_STRING(ascii_chars_b), 128) != 0) {
+            PyErr_Format(
+                PyExc_ValueError,
+                "This module compiled with c_string_encoding=ascii, but default encoding '%s' is not a superset of ascii.",
+                default_encoding_c);
+            goto bad;
+        }
+    }
+    Py_XDECREF(sys);
+    Py_XDECREF(default_encoding);
+    Py_XDECREF(ascii_chars_u);
+    Py_XDECREF(ascii_chars_b);
+    return 0;
+bad:
+    Py_XDECREF(sys);
+    Py_XDECREF(default_encoding);
+    Py_XDECREF(ascii_chars_u);
+    Py_XDECREF(ascii_chars_b);
+    return -1;
+}
+#endif
+#if __PYX_DEFAULT_STRING_ENCODING_IS_DEFAULT && PY_MAJOR_VERSION >= 3
+#define __Pyx_PyUnicode_FromStringAndSize(c_str, size) PyUnicode_DecodeUTF8(c_str, size, NULL)
+#else
+#define __Pyx_PyUnicode_FromStringAndSize(c_str, size) PyUnicode_Decode(c_str, size, __PYX_DEFAULT_STRING_ENCODING, NULL)
+#if __PYX_DEFAULT_STRING_ENCODING_IS_DEFAULT
+static char* __PYX_DEFAULT_STRING_ENCODING;
+static int __Pyx_init_sys_getdefaultencoding_params() {
+    PyObject* sys = NULL;
+    PyObject* default_encoding = NULL;
+    char* default_encoding_c;
+    sys = PyImport_ImportModule("sys");
+    if (sys == NULL) goto bad;
+    default_encoding = PyObject_CallMethod(sys, (char*) (const char*) "getdefaultencoding", NULL);
+    if (default_encoding == NULL) goto bad;
+    default_encoding_c = PyBytes_AS_STRING(default_encoding);
+    __PYX_DEFAULT_STRING_ENCODING = (char*) malloc(strlen(default_encoding_c));
+    strcpy(__PYX_DEFAULT_STRING_ENCODING, default_encoding_c);
+    Py_DECREF(sys);
+    Py_DECREF(default_encoding);
+    return 0;
+bad:
+    Py_XDECREF(sys);
+    Py_XDECREF(default_encoding);
+    return -1;
+}
+#endif
+#endif
+
+
+#ifdef __GNUC__
+  /* Test for GCC > 2.95 */
+  #if __GNUC__ > 2 || (__GNUC__ == 2 && (__GNUC_MINOR__ > 95))
+    #define likely(x)   __builtin_expect(!!(x), 1)
+    #define unlikely(x) __builtin_expect(!!(x), 0)
+  #else /* __GNUC__ > 2 ... */
+    #define likely(x)   (x)
+    #define unlikely(x) (x)
+  #endif /* __GNUC__ > 2 ... */
+#else /* __GNUC__ */
+  #define likely(x)   (x)
+  #define unlikely(x) (x)
+#endif /* __GNUC__ */
+
+static PyObject *__pyx_m;
+static PyObject *__pyx_d;
+static PyObject *__pyx_b;
+static PyObject *__pyx_empty_tuple;
+static PyObject *__pyx_empty_bytes;
+static int __pyx_lineno;
+static int __pyx_clineno = 0;
+static const char * __pyx_cfilenm= __FILE__;
+static const char *__pyx_filename;
+
+
+static const char *__pyx_f[] = {
+  "deltadump.pyx",
+  "type.pxd",
+  "bool.pxd",
+  "complex.pxd",
+};
+
+/*--- Type declarations ---*/
+struct __pyx_obj_4s3ql_9deltadump___pyx_scope_struct_1_load_table;
+struct __pyx_obj_4s3ql_9deltadump___pyx_scope_struct__dump_table;
+
+/* "s3ql/deltadump.pyx":382
+ *                         fwrite(buf, len_, fp)
+ * 
+ * def load_table(table, columns, db, fh, trx_rows=5000):             # <<<<<<<<<<<<<<
+ *     '''Load *columns* of *table* from *fh*
+ * 
+ */
+struct __pyx_obj_4s3ql_9deltadump___pyx_scope_struct_1_load_table {
+  PyObject_HEAD
+  sqlite3_stmt *__pyx_v_begin_stmt;
+  void *__pyx_v_buf;
+  int *__pyx_v_col_args;
+  int *__pyx_v_col_types;
+  sqlite3_stmt *__pyx_v_commit_stmt;
+  FILE *__pyx_v_fp;
+  int64_t *__pyx_v_int64_prev;
+  sqlite3 *__pyx_v_sqlite3_db;
+  sqlite3_stmt *__pyx_v_stmt;
+};
+
+
+/* "s3ql/deltadump.pyx":267
+ * 
+ * 
+ * def dump_table(table, order, columns, db, fh):             # <<<<<<<<<<<<<<
+ *     '''Dump *columns* of *table* into *fh*
+ * 
+ */
+struct __pyx_obj_4s3ql_9deltadump___pyx_scope_struct__dump_table {
+  PyObject_HEAD
+  int *__pyx_v_col_args;
+  int *__pyx_v_col_types;
+  FILE *__pyx_v_fp;
+  int64_t *__pyx_v_int64_prev;
+  sqlite3 *__pyx_v_sqlite3_db;
+  sqlite3_stmt *__pyx_v_stmt;
+};
+
+#ifndef CYTHON_REFNANNY
+  #define CYTHON_REFNANNY 0
+#endif
+#if CYTHON_REFNANNY
+  typedef struct {
+    void (*INCREF)(void*, PyObject*, int);
+    void (*DECREF)(void*, PyObject*, int);
+    void (*GOTREF)(void*, PyObject*, int);
+    void (*GIVEREF)(void*, PyObject*, int);
+    void* (*SetupContext)(const char*, int, const char*);
+    void (*FinishContext)(void**);
+  } __Pyx_RefNannyAPIStruct;
+  static __Pyx_RefNannyAPIStruct *__Pyx_RefNanny = NULL;
+  static __Pyx_RefNannyAPIStruct *__Pyx_RefNannyImportAPI(const char *modname); /*proto*/
+  #define __Pyx_RefNannyDeclarations void *__pyx_refnanny = NULL;
+#ifdef WITH_THREAD
+  #define __Pyx_RefNannySetupContext(name, acquire_gil) \
+          if (acquire_gil) { \
+              PyGILState_STATE __pyx_gilstate_save = PyGILState_Ensure(); \
+              __pyx_refnanny = __Pyx_RefNanny->SetupContext((name), __LINE__, __FILE__); \
+              PyGILState_Release(__pyx_gilstate_save); \
+          } else { \
+              __pyx_refnanny = __Pyx_RefNanny->SetupContext((name), __LINE__, __FILE__); \
+          }
+#else
+  #define __Pyx_RefNannySetupContext(name, acquire_gil) \
+          __pyx_refnanny = __Pyx_RefNanny->SetupContext((name), __LINE__, __FILE__)
+#endif
+  #define __Pyx_RefNannyFinishContext() \
+          __Pyx_RefNanny->FinishContext(&__pyx_refnanny)
+  #define __Pyx_INCREF(r)  __Pyx_RefNanny->INCREF(__pyx_refnanny, (PyObject *)(r), __LINE__)
+  #define __Pyx_DECREF(r)  __Pyx_RefNanny->DECREF(__pyx_refnanny, (PyObject *)(r), __LINE__)
+  #define __Pyx_GOTREF(r)  __Pyx_RefNanny->GOTREF(__pyx_refnanny, (PyObject *)(r), __LINE__)
+  #define __Pyx_GIVEREF(r) __Pyx_RefNanny->GIVEREF(__pyx_refnanny, (PyObject *)(r), __LINE__)
+  #define __Pyx_XINCREF(r)  do { if((r) != NULL) {__Pyx_INCREF(r); }} while(0)
+  #define __Pyx_XDECREF(r)  do { if((r) != NULL) {__Pyx_DECREF(r); }} while(0)
+  #define __Pyx_XGOTREF(r)  do { if((r) != NULL) {__Pyx_GOTREF(r); }} while(0)
+  #define __Pyx_XGIVEREF(r) do { if((r) != NULL) {__Pyx_GIVEREF(r);}} while(0)
+#else
+  #define __Pyx_RefNannyDeclarations
+  #define __Pyx_RefNannySetupContext(name, acquire_gil)
+  #define __Pyx_RefNannyFinishContext()
+  #define __Pyx_INCREF(r) Py_INCREF(r)
+  #define __Pyx_DECREF(r) Py_DECREF(r)
+  #define __Pyx_GOTREF(r)
+  #define __Pyx_GIVEREF(r)
+  #define __Pyx_XINCREF(r) Py_XINCREF(r)
+  #define __Pyx_XDECREF(r) Py_XDECREF(r)
+  #define __Pyx_XGOTREF(r)
+  #define __Pyx_XGIVEREF(r)
+#endif /* CYTHON_REFNANNY */
+#define __Pyx_CLEAR(r)    do { PyObject* tmp = ((PyObject*)(r)); r = NULL; __Pyx_DECREF(tmp);} while(0)
+#define __Pyx_XCLEAR(r)   do { if((r) != NULL) {PyObject* tmp = ((PyObject*)(r)); r = NULL; __Pyx_DECREF(tmp);}} while(0)
+
+#if CYTHON_COMPILING_IN_CPYTHON
+static CYTHON_INLINE PyObject* __Pyx_PyObject_GetAttrStr(PyObject* obj, PyObject* attr_name) {
+    PyTypeObject* tp = Py_TYPE(obj);
+    if (likely(tp->tp_getattro))
+        return tp->tp_getattro(obj, attr_name);
+#if PY_MAJOR_VERSION < 3
+    if (likely(tp->tp_getattr))
+        return tp->tp_getattr(obj, PyString_AS_STRING(attr_name));
+#endif
+    return PyObject_GetAttr(obj, attr_name);
+}
+#else
+#define __Pyx_PyObject_GetAttrStr(o,n) PyObject_GetAttr(o,n)
+#endif
+
+static PyObject *__Pyx_GetBuiltinName(PyObject *name); /*proto*/
+
+static CYTHON_INLINE PyObject *__Pyx_GetModuleGlobalName(PyObject *name); /*proto*/
+
+static CYTHON_INLINE void __Pyx_ErrRestore(PyObject *type, PyObject *value, PyObject *tb); /*proto*/
+static CYTHON_INLINE void __Pyx_ErrFetch(PyObject **type, PyObject **value, PyObject **tb); /*proto*/
+
+static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb, PyObject *cause); /*proto*/
+
+#if PY_VERSION_HEX < 0x02050000
+#ifndef PyAnySet_CheckExact
+#define PyAnySet_CheckExact(ob) \
+    ((ob)->ob_type == &PySet_Type || \
+     (ob)->ob_type == &PyFrozenSet_Type)
+#define PySet_New(iterable) \
+    PyObject_CallFunctionObjArgs((PyObject *)&PySet_Type, (iterable), NULL)
+#define Pyx_PyFrozenSet_New(iterable) \
+    PyObject_CallFunctionObjArgs((PyObject *)&PyFrozenSet_Type, (iterable), NULL)
+#define PySet_Size(anyset) \
+    PyObject_Size((anyset))
+#define PySet_Contains(anyset, key) \
+    PySequence_Contains((anyset), (key))
+#define PySet_Pop(set) \
+    PyObject_CallMethod(set, (char *)"pop", NULL)
+static CYTHON_INLINE int PySet_Clear(PyObject *set) {
+    PyObject *ret = PyObject_CallMethod(set, (char *)"clear", NULL);
+    if (!ret) return -1;
+    Py_DECREF(ret); return 0;
+}
+static CYTHON_INLINE int PySet_Discard(PyObject *set, PyObject *key) {
+    PyObject *ret = PyObject_CallMethod(set, (char *)"discard", (char *)"O", key);
+    if (!ret) return -1;
+    Py_DECREF(ret); return 0;
+}
+static CYTHON_INLINE int PySet_Add(PyObject *set, PyObject *key) {
+    PyObject *ret = PyObject_CallMethod(set, (char *)"add", (char *)"O", key);
+    if (!ret) return -1;
+    Py_DECREF(ret); return 0;
+}
+#endif /* PyAnySet_CheckExact (<= Py2.4) */
+#endif /* < Py2.5  */
+
+#define __Pyx_GetItemInt(o, i, size, to_py_func, is_list, wraparound, boundscheck) \
+    (((size) <= sizeof(Py_ssize_t)) ? \
+    __Pyx_GetItemInt_Fast(o, i, is_list, wraparound, boundscheck) : \
+    __Pyx_GetItemInt_Generic(o, to_py_func(i)))
+#define __Pyx_GetItemInt_List(o, i, size, to_py_func, is_list, wraparound, boundscheck) \
+    (((size) <= sizeof(Py_ssize_t)) ? \
+    __Pyx_GetItemInt_List_Fast(o, i, wraparound, boundscheck) : \
+    __Pyx_GetItemInt_Generic(o, to_py_func(i)))
+static CYTHON_INLINE PyObject *__Pyx_GetItemInt_List_Fast(PyObject *o, Py_ssize_t i,
+                                                              int wraparound, int boundscheck);
+#define __Pyx_GetItemInt_Tuple(o, i, size, to_py_func, is_list, wraparound, boundscheck) \
+    (((size) <= sizeof(Py_ssize_t)) ? \
+    __Pyx_GetItemInt_Tuple_Fast(o, i, wraparound, boundscheck) : \
+    __Pyx_GetItemInt_Generic(o, to_py_func(i)))
+static CYTHON_INLINE PyObject *__Pyx_GetItemInt_Tuple_Fast(PyObject *o, Py_ssize_t i,
+                                                              int wraparound, int boundscheck);
+static CYTHON_INLINE PyObject *__Pyx_GetItemInt_Generic(PyObject *o, PyObject* j);
+static CYTHON_INLINE PyObject *__Pyx_GetItemInt_Fast(PyObject *o, Py_ssize_t i,
+                                                     int is_list, int wraparound, int boundscheck);
+
+static void __Pyx_RaiseArgtupleInvalid(const char* func_name, int exact,
+    Py_ssize_t num_min, Py_ssize_t num_max, Py_ssize_t num_found); /*proto*/
+
+static void __Pyx_RaiseDoubleKeywordsError(const char* func_name, PyObject* kw_name); /*proto*/
+
+static int __Pyx_ParseOptionalKeywords(PyObject *kwds, PyObject **argnames[], \
+    PyObject *kwds2, PyObject *values[], Py_ssize_t num_pos_args, \
+    const char* function_name); /*proto*/
+
+#define __Pyx_CyFunction_USED 1
+#include <structmember.h>
+#define __Pyx_CYFUNCTION_STATICMETHOD  0x01
+#define __Pyx_CYFUNCTION_CLASSMETHOD   0x02
+#define __Pyx_CYFUNCTION_CCLASS        0x04
+#define __Pyx_CyFunction_GetClosure(f) \
+    (((__pyx_CyFunctionObject *) (f))->func_closure)
+#define __Pyx_CyFunction_GetClassObj(f) \
+    (((__pyx_CyFunctionObject *) (f))->func_classobj)
+#define __Pyx_CyFunction_Defaults(type, f) \
+    ((type *)(((__pyx_CyFunctionObject *) (f))->defaults))
+#define __Pyx_CyFunction_SetDefaultsGetter(f, g) \
+    ((__pyx_CyFunctionObject *) (f))->defaults_getter = (g)
+typedef struct {
+    PyCFunctionObject func;
+    int flags;
+    PyObject *func_dict;
+    PyObject *func_weakreflist;
+    PyObject *func_name;
+    PyObject *func_qualname;
+    PyObject *func_doc;
+    PyObject *func_code;
+    PyObject *func_closure;
+    PyObject *func_classobj; /* No-args super() class cell */
+    void *defaults;
+    int defaults_pyobjects;
+    PyObject *defaults_tuple;   /* Const defaults tuple */
+    PyObject *defaults_kwdict;  /* Const kwonly defaults dict */
+    PyObject *(*defaults_getter)(PyObject *);
+    PyObject *func_annotations; /* function annotations dict */
+} __pyx_CyFunctionObject;
+static PyTypeObject *__pyx_CyFunctionType = 0;
+#define __Pyx_CyFunction_NewEx(ml, flags, qualname, self, module, code) \
+    __Pyx_CyFunction_New(__pyx_CyFunctionType, ml, flags, qualname, self, module, code)
+static PyObject *__Pyx_CyFunction_New(PyTypeObject *, PyMethodDef *ml,
+                                      int flags, PyObject* qualname,
+                                      PyObject *self, PyObject *module,
+                                      PyObject* code);
+static CYTHON_INLINE void *__Pyx_CyFunction_InitDefaults(PyObject *m,
+                                                         size_t size,
+                                                         int pyobjects);
+static CYTHON_INLINE void __Pyx_CyFunction_SetDefaultsTuple(PyObject *m,
+                                                            PyObject *tuple);
+static CYTHON_INLINE void __Pyx_CyFunction_SetDefaultsKwDict(PyObject *m,
+                                                             PyObject *dict);
+static CYTHON_INLINE void __Pyx_CyFunction_SetAnnotationsDict(PyObject *m,
+                                                              PyObject *dict);
+static int __Pyx_CyFunction_init(void);
+
+#if CYTHON_COMPILING_IN_CPYTHON
+static CYTHON_INLINE int __Pyx_ListComp_Append(PyObject* list, PyObject* x) {
+    PyListObject* L = (PyListObject*) list;
+    Py_ssize_t len = Py_SIZE(list);
+    if (likely(L->allocated > len)) {
+        Py_INCREF(x);
+        PyList_SET_ITEM(list, len, x);
+        Py_SIZE(list) = len+1;
+        return 0;
+    }
+    return PyList_Append(list, x);
+}
+#else
+#define __Pyx_ListComp_Append(L,x) PyList_Append(L,x)
+#endif
+
+static int __Pyx_GetException(PyObject **type, PyObject **value, PyObject **tb); /*proto*/
+
+#ifndef __PYX_FORCE_INIT_THREADS
+  #define __PYX_FORCE_INIT_THREADS 0
+#endif
+
+#include <string.h>
+
+static PyObject* __Pyx_ImportFrom(PyObject* module, PyObject* name); /*proto*/
+
+static CYTHON_INLINE void __Pyx_ExceptionSave(PyObject **type, PyObject **value, PyObject **tb); /*proto*/
+static void __Pyx_ExceptionReset(PyObject *type, PyObject *value, PyObject *tb); /*proto*/
+
+static PyObject *__Pyx_Import(PyObject *name, PyObject *from_list, int level); /*proto*/
+
+static CYTHON_INLINE int64_t __Pyx_PyInt_from_py_int64_t(PyObject *);
+
+static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_int64_t(int64_t);
+
+static CYTHON_INLINE unsigned char __Pyx_PyInt_AsUnsignedChar(PyObject *);
+
+static CYTHON_INLINE unsigned short __Pyx_PyInt_AsUnsignedShort(PyObject *);
+
+static CYTHON_INLINE unsigned int __Pyx_PyInt_AsUnsignedInt(PyObject *);
+
+static CYTHON_INLINE char __Pyx_PyInt_AsChar(PyObject *);
+
+static CYTHON_INLINE short __Pyx_PyInt_AsShort(PyObject *);
+
+static CYTHON_INLINE int __Pyx_PyInt_AsInt(PyObject *);
+
+static CYTHON_INLINE signed char __Pyx_PyInt_AsSignedChar(PyObject *);
+
+static CYTHON_INLINE signed short __Pyx_PyInt_AsSignedShort(PyObject *);
+
+static CYTHON_INLINE signed int __Pyx_PyInt_AsSignedInt(PyObject *);
+
+static CYTHON_INLINE int __Pyx_PyInt_AsLongDouble(PyObject *);
+
+static CYTHON_INLINE unsigned long __Pyx_PyInt_AsUnsignedLong(PyObject *);
+
+static CYTHON_INLINE unsigned PY_LONG_LONG __Pyx_PyInt_AsUnsignedLongLong(PyObject *);
+
+static CYTHON_INLINE long __Pyx_PyInt_AsLong(PyObject *);
+
+static CYTHON_INLINE PY_LONG_LONG __Pyx_PyInt_AsLongLong(PyObject *);
+
+static CYTHON_INLINE signed long __Pyx_PyInt_AsSignedLong(PyObject *);
+
+static CYTHON_INLINE signed PY_LONG_LONG __Pyx_PyInt_AsSignedLongLong(PyObject *);
+
+static int __Pyx_check_binary_version(void);
+
+#if !defined(__Pyx_PyIdentifier_FromString)
+#if PY_MAJOR_VERSION < 3
+  #define __Pyx_PyIdentifier_FromString(s) PyString_FromString(s)
+#else
+  #define __Pyx_PyIdentifier_FromString(s) PyUnicode_FromString(s)
+#endif
+#endif
+
+static PyObject *__Pyx_ImportModule(const char *name); /*proto*/
+
+static PyTypeObject *__Pyx_ImportType(const char *module_name, const char *class_name, size_t size, int strict);  /*proto*/
+
+typedef struct {
+    int code_line;
+    PyCodeObject* code_object;
+} __Pyx_CodeObjectCacheEntry;
+struct __Pyx_CodeObjectCache {
+    int count;
+    int max_count;
+    __Pyx_CodeObjectCacheEntry* entries;
+};
+static struct __Pyx_CodeObjectCache __pyx_code_cache = {0,0,NULL};
+static int __pyx_bisect_code_objects(__Pyx_CodeObjectCacheEntry* entries, int count, int code_line);
+static PyCodeObject *__pyx_find_code_object(int code_line);
+static void __pyx_insert_code_object(int code_line, PyCodeObject* code_object);
+
+static void __Pyx_AddTraceback(const char *funcname, int c_line,
+                               int py_line, const char *filename); /*proto*/
+
+static int __Pyx_InitStrings(__Pyx_StringTabEntry *t); /*proto*/
+
+
+/* Module declarations from 'cpython.long' */
+
+/* Module declarations from 'cpython.version' */
+
+/* Module declarations from 'cpython.ref' */
+
+/* Module declarations from 'cpython.exc' */
+
+/* Module declarations from 'cpython.module' */
+
+/* Module declarations from 'cpython.mem' */
+
+/* Module declarations from 'cpython.tuple' */
+
+/* Module declarations from 'cpython.list' */
+
+/* Module declarations from 'libc.string' */
+
+/* Module declarations from 'libc.stdio' */
+
+/* Module declarations from 'cpython.object' */
+
+/* Module declarations from 'cpython.sequence' */
+
+/* Module declarations from 'cpython.mapping' */
+
+/* Module declarations from 'cpython.iterator' */
+
+/* Module declarations from '__builtin__' */
+
+/* Module declarations from 'cpython.type' */
+static PyTypeObject *__pyx_ptype_7cpython_4type_type = 0;
+
+/* Module declarations from 'cpython.number' */
+
+/* Module declarations from 'cpython.int' */
+
+/* Module declarations from '__builtin__' */
+
+/* Module declarations from 'cpython.bool' */
+static PyTypeObject *__pyx_ptype_7cpython_4bool_bool = 0;
+
+/* Module declarations from 'cpython.float' */
+
+/* Module declarations from '__builtin__' */
+
+/* Module declarations from 'cpython.complex' */
+static PyTypeObject *__pyx_ptype_7cpython_7complex_complex = 0;
+
+/* Module declarations from 'cpython.string' */
+
+/* Module declarations from 'cpython.unicode' */
+
+/* Module declarations from 'cpython.dict' */
+
+/* Module declarations from 'cpython.instance' */
+
+/* Module declarations from 'cpython.function' */
+
+/* Module declarations from 'cpython.method' */
+
+/* Module declarations from 'cpython.weakref' */
+
+/* Module declarations from 'cpython.getargs' */
+
+/* Module declarations from 'cpython.pythread' */
+
+/* Module declarations from 'cpython.pystate' */
+
+/* Module declarations from 'cpython.cobject' */
+
+/* Module declarations from 'cpython.oldbuffer' */
+
+/* Module declarations from 'cpython.set' */
+
+/* Module declarations from 'cpython.buffer' */
+
+/* Module declarations from 'cpython.bytes' */
+
+/* Module declarations from 'cpython.pycapsule' */
+
+/* Module declarations from 'cpython' */
+
+/* Module declarations from 'libc.errno' */
+
+/* Module declarations from 'libc.stdlib' */
+
+/* Module declarations from 'libc.stdint' */
+
+/* Module declarations from 'posix.unistd' */
+
+/* Module declarations from 's3ql.deltadump' */
+static PyTypeObject *__pyx_ptype_4s3ql_9deltadump___pyx_scope_struct_1_load_table = 0;
+static PyTypeObject *__pyx_ptype_4s3ql_9deltadump___pyx_scope_struct__dump_table = 0;
+static int __pyx_v_4s3ql_9deltadump__INTEGER;
+static int __pyx_v_4s3ql_9deltadump__BLOB;
+static int __pyx_v_4s3ql_9deltadump__TIME;
+static uint8_t __pyx_v_4s3ql_9deltadump_INT8;
+static uint8_t __pyx_v_4s3ql_9deltadump_INT16;
+static uint8_t __pyx_v_4s3ql_9deltadump_INT32;
+static uint8_t __pyx_v_4s3ql_9deltadump_INT64;
+static double __pyx_v_4s3ql_9deltadump_time_scale;
+static CYTHON_INLINE int __pyx_f_4s3ql_9deltadump_fwrite(const void *, size_t, FILE *); /*proto*/
+static CYTHON_INLINE int __pyx_f_4s3ql_9deltadump_fread(void *, size_t, FILE *); /*proto*/
+static PyObject *__pyx_f_4s3ql_9deltadump_free(void *); /*proto*/
+static int __pyx_f_4s3ql_9deltadump_fclose(FILE *); /*proto*/
+static void *__pyx_f_4s3ql_9deltadump_calloc(size_t, size_t); /*proto*/
+static int __pyx_f_4s3ql_9deltadump_SQLITE_CHECK_RC(int, int, sqlite3 *); /*proto*/
+static int __pyx_f_4s3ql_9deltadump_prep_columns(PyObject *, int **, int **); /*proto*/
+static FILE *__pyx_f_4s3ql_9deltadump_dup_to_fp(PyObject *, PyObject *); /*proto*/
+static CYTHON_INLINE int __pyx_f_4s3ql_9deltadump_write_integer(int64_t, FILE *); /*proto*/
+static CYTHON_INLINE int __pyx_f_4s3ql_9deltadump_read_integer(int64_t *, FILE *); /*proto*/
+#define __Pyx_MODULE_NAME "s3ql.deltadump"
+int __pyx_module_is_main_s3ql__deltadump = 0;
+
+/* Implementation of 's3ql.deltadump' */
+static PyObject *__pyx_builtin_RuntimeError;
+static PyObject *__pyx_builtin_IOError;
+static PyObject *__pyx_builtin_OSError;
+static PyObject *__pyx_builtin_range;
+static PyObject *__pyx_builtin_ValueError;
+static PyObject *__pyx_pf_4s3ql_9deltadump_check_sqlite(CYTHON_UNUSED PyObject *__pyx_self); /* proto */
+static PyObject *__pyx_lambda_funcdef_lambda1(PyObject *__pyx_self); /* proto */
+static PyObject *__pyx_lambda_funcdef_lambda2(PyObject *__pyx_self); /* proto */
+static PyObject *__pyx_lambda_funcdef_lambda3(PyObject *__pyx_self); /* proto */
+static PyObject *__pyx_lambda_funcdef_lambda4(PyObject *__pyx_self); /* proto */
+static PyObject *__pyx_lambda_funcdef_lambda5(PyObject *__pyx_self); /* proto */
+static PyObject *__pyx_lambda_funcdef_lambda6(PyObject *__pyx_self); /* proto */
+static PyObject *__pyx_pf_4s3ql_9deltadump_2dump_table(CYTHON_UNUSED PyObject *__pyx_self, PyObject *__pyx_v_table, PyObject *__pyx_v_order, PyObject *__pyx_v_columns, PyObject *__pyx_v_db, PyObject *__pyx_v_fh); /* proto */
+static PyObject *__pyx_lambda_funcdef_lambda7(PyObject *__pyx_self); /* proto */
+static PyObject *__pyx_lambda_funcdef_lambda8(PyObject *__pyx_self); /* proto */
+static PyObject *__pyx_lambda_funcdef_lambda9(PyObject *__pyx_self); /* proto */
+static PyObject *__pyx_lambda_funcdef_lambda10(PyObject *__pyx_self); /* proto */
+static PyObject *__pyx_lambda_funcdef_lambda11(PyObject *__pyx_self); /* proto */
+static PyObject *__pyx_lambda_funcdef_lambda12(PyObject *__pyx_self); /* proto */
+static PyObject *__pyx_lambda_funcdef_lambda13(PyObject *__pyx_self); /* proto */
+static PyObject *__pyx_lambda_funcdef_lambda14(PyObject *__pyx_self); /* proto */
+static PyObject *__pyx_lambda_funcdef_lambda15(PyObject *__pyx_self); /* proto */
+static PyObject *__pyx_lambda_funcdef_lambda16(PyObject *__pyx_self); /* proto */
+static PyObject *__pyx_pf_4s3ql_9deltadump_4load_table(CYTHON_UNUSED PyObject *__pyx_self, PyObject *__pyx_v_table, PyObject *__pyx_v_columns, PyObject *__pyx_v_db, PyObject *__pyx_v_fh, PyObject *__pyx_v_trx_rows); /* proto */
+static PyObject *__pyx_tp_new_4s3ql_9deltadump___pyx_scope_struct_1_load_table(PyTypeObject *t, PyObject *a, PyObject *k); /*proto*/
+static PyObject *__pyx_tp_new_4s3ql_9deltadump___pyx_scope_struct__dump_table(PyTypeObject *t, PyObject *a, PyObject *k); /*proto*/
+static char __pyx_k_1[] = "apsw sqlite version: %s, s3ql sqlite version: %s";
+static char __pyx_k_2[] = "SQLite version mismatch between APSW and S3QL (%s vs %s)";
+static char __pyx_k_4[] = "apsw sqlite compile options: %s, s3ql sqlite compile options: %s";
+static char __pyx_k_5[] = "SQLite code used by APSW was compiled with different options than SQLite code available to S3QL! Differing settings: + %s, - %s";
+static char __pyx_k_6[] = "Invalid type for column %d";
+static char __pyx_k_7[] = ":memory:";
+static char __pyx_k_8[] = "Can't access in-memory databases";
+static char __pyx_k_10[] = "Opening connection to %s";
+static char __pyx_k_11[] = "dump_table.<locals>.<lambda>";
+static char __pyx_k_12[] = "s3ql.deltadump";
+static char __pyx_k_13[] = "SELECT %s FROM %s ORDER BY %s ";
+static char __pyx_k_14[] = ", ";
+static char __pyx_k_15[] = "SELECT COUNT(rowid) FROM %s";
+static char __pyx_k_16[] = "dump_table(%s): writing %d rows";
+static char __pyx_k_17[] = "Can't dump NULL values";
+static char __pyx_k_19[] = "Can not dump BLOB of size %d (max: %d)";
+static char __pyx_k_20[] = "Length %d != %d in column %d";
+static char __pyx_k_23[] = "load_table.<locals>.<lambda>";
+static char __pyx_k_25[] = "PRAGMA %s";
+static char __pyx_k_26[] = "PRAGMA %s = %s";
+static char __pyx_k_27[] = "INSERT INTO %s (%s) VALUES(%s)";
+static char __pyx_k_28[] = "?";
+static char __pyx_k_29[] = "BEGIN TRANSACTION";
+static char __pyx_k_30[] = "COMMIT TRANSACTION";
+static char __pyx_k_31[] = "load_table(%s): reading %d rows";
+static char __pyx_k_32[] = "BLOB too large to read (%d vs %d)";
+static char __pyx_k_34[] = "\n_deltadump.pyx - this file is part of S3QL (http://s3ql.googlecode.com)\n\nCopyright (C) Nikolaus Rath <Nikolaus@rath.org>\n\nThis program can be distributed under the terms of the GNU GPLv3.\n";
+static char __pyx_k_38[] = "/home/nikratio/in-progress/s3ql/src/s3ql/deltadump.pyx";
+static char __pyx_k__i[] = "i";
+static char __pyx_k__j[] = "j";
+static char __pyx_k__x[] = "x";
+static char __pyx_k__db[] = "db";
+static char __pyx_k__fh[] = "fh";
+static char __pyx_k__fp[] = "fp";
+static char __pyx_k__os[] = "os";
+static char __pyx_k__rb[] = "rb";
+static char __pyx_k__rc[] = "rc";
+static char __pyx_k__wb[] = "wb";
+static char __pyx_k__buf[] = "buf";
+static char __pyx_k__cmd[] = "cmd";
+static char __pyx_k__idx[] = "idx";
+static char __pyx_k__log[] = "log";
+static char __pyx_k__tmp[] = "tmp";
+static char __pyx_k__val[] = "val";
+static char __pyx_k__BLOB[] = "BLOB";
+static char __pyx_k__TIME[] = "TIME";
+static char __pyx_k__apsw[] = "apsw";
+static char __pyx_k__file[] = "file";
+static char __pyx_k__join[] = "join";
+static char __pyx_k__len_[] = "len_";
+static char __pyx_k__stmt[] = "stmt";
+static char __pyx_k__count[] = "count";
+static char __pyx_k__debug[] = "debug";
+static char __pyx_k__int64[] = "int64";
+static char __pyx_k__order[] = "order";
+static char __pyx_k__query[] = "query";
+static char __pyx_k__range[] = "range";
+static char __pyx_k__table[] = "table";
+static char __pyx_k__fileno[] = "fileno";
+static char __pyx_k__pragma[] = "pragma";
+static char __pyx_k__INTEGER[] = "INTEGER";
+static char __pyx_k__IOError[] = "IOError";
+static char __pyx_k__OSError[] = "OSError";
+static char __pyx_k__cleanup[] = "cleanup";
+static char __pyx_k__columns[] = "columns";
+static char __pyx_k__get_val[] = "get_val";
+static char __pyx_k__logging[] = "logging";
+static char __pyx_k____exit__[] = "__exit__";
+static char __pyx_k____main__[] = "__main__";
+static char __pyx_k____test__[] = "__test__";
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+static char __pyx_k__register[] = "register";
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+static char __pyx_k____enter__[] = "__enter__";
+static char __pyx_k__col_count[] = "col_count";
+static char __pyx_k__col_names[] = "col_names";
+static char __pyx_k__col_types[] = "col_types";
+static char __pyx_k__deltadump[] = "deltadump";
+static char __pyx_k__getLogger[] = "getLogger";
+static char __pyx_k__itertools[] = "itertools";
+static char __pyx_k__row_count[] = "row_count";
+static char __pyx_k__ValueError[] = "ValueError";
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+static char __pyx_k__dump_table[] = "dump_table";
+static char __pyx_k__int64_prev[] = "int64_prev";
+static char __pyx_k__load_table[] = "load_table";
+static char __pyx_k__sqlite3_db[] = "sqlite3_db";
+static char __pyx_k__commit_stmt[] = "commit_stmt";
+static char __pyx_k__synchronous[] = "synchronous";
+static char __pyx_k__RuntimeError[] = "RuntimeError";
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+static char __pyx_k__exceptionfor[] = "exceptionfor";
+static char __pyx_k__foreign_keys[] = "foreign_keys";
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+static char __pyx_k__CleanupManager[] = "CleanupManager";
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+static PyObject *__pyx_n_s__CleanupManager;
+static PyObject *__pyx_n_s__INTEGER;
+static PyObject *__pyx_n_s__IOError;
+static PyObject *__pyx_n_s__MAX_BLOB_SIZE;
+static PyObject *__pyx_n_s__OSError;
+static PyObject *__pyx_n_s__RuntimeError;
+static PyObject *__pyx_n_s__TIME;
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+static PyObject *__pyx_n_s____exit__;
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+static PyObject *__pyx_n_s__apsw_sqlite_version;
+static PyObject *__pyx_n_s__begin_stmt;
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+static PyObject *__pyx_n_s__check_sqlite;
+static PyObject *__pyx_n_s__cleanup;
+static PyObject *__pyx_n_s__cleanup_manager;
+static PyObject *__pyx_n_s__cmd;
+static PyObject *__pyx_n_s__col_args;
+static PyObject *__pyx_n_s__col_count;
+static PyObject *__pyx_n_s__col_names;
+static PyObject *__pyx_n_s__col_types;
+static PyObject *__pyx_n_s__columns;
+static PyObject *__pyx_n_s__commit_stmt;
+static PyObject *__pyx_n_s__compile_options;
+static PyObject *__pyx_n_s__count;
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+static PyObject *__pyx_n_s__debug;
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+static PyObject *__pyx_n_s__exceptionfor;
+static PyObject *__pyx_n_s__fh;
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+static PyObject *__pyx_n_s__fileno;
+static PyObject *__pyx_n_s__foreign_keys;
+static PyObject *__pyx_n_s__fp;
+static PyObject *__pyx_n_s__getLogger;
+static PyObject *__pyx_n_s__get_val;
+static PyObject *__pyx_n_s__i;
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+static PyObject *__pyx_n_s__int64;
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+static PyObject *__pyx_n_s__j;
+static PyObject *__pyx_n_s__join;
+static PyObject *__pyx_n_s__len_;
+static PyObject *__pyx_n_s__load_table;
+static PyObject *__pyx_n_s__log;
+static PyObject *__pyx_n_s__logging;
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+static PyObject *__pyx_n_s__os;
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+static PyObject *__pyx_n_s__register;
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+          /* "s3ql/deltadump.pyx":343
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+ */
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+            /* "s3ql/deltadump.pyx":347
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+
+            /* "s3ql/deltadump.pyx":349
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+ */
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+    /* "s3ql/deltadump.pyx":554
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+ */
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+}
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+}
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+}
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+}
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+}
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+}
+static CYTHON_INLINE PyObject *__Pyx_GetItemInt_Tuple_Fast(PyObject *o, Py_ssize_t i,
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+    return __Pyx_GetItemInt_Generic(o, PyInt_FromSsize_t(i));
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+#endif
+}
+static CYTHON_INLINE PyObject *__Pyx_GetItemInt_Fast(PyObject *o, Py_ssize_t i,
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+    if (is_list || PyList_CheckExact(o)) {
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+        if ((!boundscheck) || (likely((n >= 0) & (n < PyList_GET_SIZE(o))))) {
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+    else if (PyTuple_CheckExact(o)) {
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+}
+
+static void __Pyx_RaiseArgtupleInvalid(
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+    int exact,
+    Py_ssize_t num_min,
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+{
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+}
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+        "%s() got multiple values for keyword argument '%U'", func_name, kw_name);
+        #else
+        "%s() got multiple values for keyword argument '%s'", func_name,
+        PyString_AsString(kw_name));
+        #endif
+}
+
+static int __Pyx_ParseOptionalKeywords(
+    PyObject *kwds,
+    PyObject **argnames[],
+    PyObject *kwds2,
+    PyObject *values[],
+    Py_ssize_t num_pos_args,
+    const char* function_name)
+{
+    PyObject *key = 0, *value = 0;
+    Py_ssize_t pos = 0;
+    PyObject*** name;
+    PyObject*** first_kw_arg = argnames + num_pos_args;
+    while (PyDict_Next(kwds, &pos, &key, &value)) {
+        name = first_kw_arg;
+        while (*name && (**name != key)) name++;
+        if (*name) {
+            values[name-argnames] = value;
+            continue;
+        }
+        name = first_kw_arg;
+        #if PY_MAJOR_VERSION < 3
+        if (likely(PyString_CheckExact(key)) || likely(PyString_Check(key))) {
+            while (*name) {
+                if ((CYTHON_COMPILING_IN_PYPY || PyString_GET_SIZE(**name) == PyString_GET_SIZE(key))
+                        && _PyString_Eq(**name, key)) {
+                    values[name-argnames] = value;
+                    break;
+                }
+                name++;
+            }
+            if (*name) continue;
+            else {
+                PyObject*** argname = argnames;
+                while (argname != first_kw_arg) {
+                    if ((**argname == key) || (
+                            (CYTHON_COMPILING_IN_PYPY || PyString_GET_SIZE(**argname) == PyString_GET_SIZE(key))
+                             && _PyString_Eq(**argname, key))) {
+                        goto arg_passed_twice;
+                    }
+                    argname++;
+                }
+            }
+        } else
+        #endif
+        if (likely(PyUnicode_Check(key))) {
+            while (*name) {
+                int cmp = (**name == key) ? 0 :
+                #if !CYTHON_COMPILING_IN_PYPY && PY_MAJOR_VERSION >= 3
+                    (PyUnicode_GET_SIZE(**name) != PyUnicode_GET_SIZE(key)) ? 1 :
+                #endif
+                    PyUnicode_Compare(**name, key);
+                if (cmp < 0 && unlikely(PyErr_Occurred())) goto bad;
+                if (cmp == 0) {
+                    values[name-argnames] = value;
+                    break;
+                }
+                name++;
+            }
+            if (*name) continue;
+            else {
+                PyObject*** argname = argnames;
+                while (argname != first_kw_arg) {
+                    int cmp = (**argname == key) ? 0 :
+                    #if !CYTHON_COMPILING_IN_PYPY && PY_MAJOR_VERSION >= 3
+                        (PyUnicode_GET_SIZE(**argname) != PyUnicode_GET_SIZE(key)) ? 1 :
+                    #endif
+                        PyUnicode_Compare(**argname, key);
+                    if (cmp < 0 && unlikely(PyErr_Occurred())) goto bad;
+                    if (cmp == 0) goto arg_passed_twice;
+                    argname++;
+                }
+            }
+        } else
+            goto invalid_keyword_type;
+        if (kwds2) {
+            if (unlikely(PyDict_SetItem(kwds2, key, value))) goto bad;
+        } else {
+            goto invalid_keyword;
+        }
+    }
+    return 0;
+arg_passed_twice:
+    __Pyx_RaiseDoubleKeywordsError(function_name, key);
+    goto bad;
+invalid_keyword_type:
+    PyErr_Format(PyExc_TypeError,
+        "%s() keywords must be strings", function_name);
+    goto bad;
+invalid_keyword:
+    PyErr_Format(PyExc_TypeError,
+    #if PY_MAJOR_VERSION < 3
+        "%s() got an unexpected keyword argument '%s'",
+        function_name, PyString_AsString(key));
+    #else
+        "%s() got an unexpected keyword argument '%U'",
+        function_name, key);
+    #endif
+bad:
+    return -1;
+}
+
+static PyObject *
+__Pyx_CyFunction_get_doc(__pyx_CyFunctionObject *op, CYTHON_UNUSED void *closure)
+{
+    if (unlikely(op->func_doc == NULL)) {
+        if (op->func.m_ml->ml_doc) {
+#if PY_MAJOR_VERSION >= 3
+            op->func_doc = PyUnicode_FromString(op->func.m_ml->ml_doc);
+#else
+            op->func_doc = PyString_FromString(op->func.m_ml->ml_doc);
+#endif
+            if (unlikely(op->func_doc == NULL))
+                return NULL;
+        } else {
+            Py_INCREF(Py_None);
+            return Py_None;
+        }
+    }
+    Py_INCREF(op->func_doc);
+    return op->func_doc;
+}
+static int
+__Pyx_CyFunction_set_doc(__pyx_CyFunctionObject *op, PyObject *value)
+{
+    PyObject *tmp = op->func_doc;
+    if (value == NULL)
+        value = Py_None; /* Mark as deleted */
+    Py_INCREF(value);
+    op->func_doc = value;
+    Py_XDECREF(tmp);
+    return 0;
+}
+static PyObject *
+__Pyx_CyFunction_get_name(__pyx_CyFunctionObject *op)
+{
+    if (unlikely(op->func_name == NULL)) {
+#if PY_MAJOR_VERSION >= 3
+        op->func_name = PyUnicode_InternFromString(op->func.m_ml->ml_name);
+#else
+        op->func_name = PyString_InternFromString(op->func.m_ml->ml_name);
+#endif
+        if (unlikely(op->func_name == NULL))
+            return NULL;
+    }
+    Py_INCREF(op->func_name);
+    return op->func_name;
+}
+static int
+__Pyx_CyFunction_set_name(__pyx_CyFunctionObject *op, PyObject *value)
+{
+    PyObject *tmp;
+#if PY_MAJOR_VERSION >= 3
+    if (unlikely(value == NULL || !PyUnicode_Check(value))) {
+#else
+    if (unlikely(value == NULL || !PyString_Check(value))) {
+#endif
+        PyErr_SetString(PyExc_TypeError,
+                        "__name__ must be set to a string object");
+        return -1;
+    }
+    tmp = op->func_name;
+    Py_INCREF(value);
+    op->func_name = value;
+    Py_XDECREF(tmp);
+    return 0;
+}
+static PyObject *
+__Pyx_CyFunction_get_qualname(__pyx_CyFunctionObject *op)
+{
+    Py_INCREF(op->func_qualname);
+    return op->func_qualname;
+}
+static int
+__Pyx_CyFunction_set_qualname(__pyx_CyFunctionObject *op, PyObject *value)
+{
+    PyObject *tmp;
+#if PY_MAJOR_VERSION >= 3
+    if (unlikely(value == NULL || !PyUnicode_Check(value))) {
+#else
+    if (unlikely(value == NULL || !PyString_Check(value))) {
+#endif
+        PyErr_SetString(PyExc_TypeError,
+                        "__qualname__ must be set to a string object");
+        return -1;
+    }
+    tmp = op->func_qualname;
+    Py_INCREF(value);
+    op->func_qualname = value;
+    Py_XDECREF(tmp);
+    return 0;
+}
+static PyObject *
+__Pyx_CyFunction_get_self(__pyx_CyFunctionObject *m, CYTHON_UNUSED void *closure)
+{
+    PyObject *self;
+    self = m->func_closure;
+    if (self == NULL)
+        self = Py_None;
+    Py_INCREF(self);
+    return self;
+}
+static PyObject *
+__Pyx_CyFunction_get_dict(__pyx_CyFunctionObject *op)
+{
+    if (unlikely(op->func_dict == NULL)) {
+        op->func_dict = PyDict_New();
+        if (unlikely(op->func_dict == NULL))
+            return NULL;
+    }
+    Py_INCREF(op->func_dict);
+    return op->func_dict;
+}
+static int
+__Pyx_CyFunction_set_dict(__pyx_CyFunctionObject *op, PyObject *value)
+{
+    PyObject *tmp;
+    if (unlikely(value == NULL)) {
+        PyErr_SetString(PyExc_TypeError,
+               "function's dictionary may not be deleted");
+        return -1;
+    }
+    if (unlikely(!PyDict_Check(value))) {
+        PyErr_SetString(PyExc_TypeError,
+               "setting function's dictionary to a non-dict");
+        return -1;
+    }
+    tmp = op->func_dict;
+    Py_INCREF(value);
+    op->func_dict = value;
+    Py_XDECREF(tmp);
+    return 0;
+}
+static PyObject *
+__Pyx_CyFunction_get_globals(CYTHON_UNUSED __pyx_CyFunctionObject *op)
+{
+    PyObject* dict = PyModule_GetDict(__pyx_m);
+    Py_XINCREF(dict);
+    return dict;
+}
+static PyObject *
+__Pyx_CyFunction_get_closure(CYTHON_UNUSED __pyx_CyFunctionObject *op)
+{
+    Py_INCREF(Py_None);
+    return Py_None;
+}
+static PyObject *
+__Pyx_CyFunction_get_code(__pyx_CyFunctionObject *op)
+{
+    PyObject* result = (op->func_code) ? op->func_code : Py_None;
+    Py_INCREF(result);
+    return result;
+}
+static int
+__Pyx_CyFunction_init_defaults(__pyx_CyFunctionObject *op) {
+    PyObject *res = op->defaults_getter((PyObject *) op);
+    if (unlikely(!res))
+        return -1;
+    op->defaults_tuple = PyTuple_GET_ITEM(res, 0);
+    Py_INCREF(op->defaults_tuple);
+    op->defaults_kwdict = PyTuple_GET_ITEM(res, 1);
+    Py_INCREF(op->defaults_kwdict);
+    Py_DECREF(res);
+    return 0;
+}
+static int
+__Pyx_CyFunction_set_defaults(__pyx_CyFunctionObject *op, PyObject* value) {
+    PyObject* tmp;
+    if (!value) {
+        value = Py_None;
+    } else if (value != Py_None && !PyTuple_Check(value)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "__defaults__ must be set to a tuple object");
+        return -1;
+    }
+    Py_INCREF(value);
+    tmp = op->defaults_tuple;
+    op->defaults_tuple = value;
+    Py_XDECREF(tmp);
+    return 0;
+}
+static PyObject *
+__Pyx_CyFunction_get_defaults(__pyx_CyFunctionObject *op) {
+    PyObject* result = op->defaults_tuple;
+    if (unlikely(!result)) {
+        if (op->defaults_getter) {
+            if (__Pyx_CyFunction_init_defaults(op) < 0) return NULL;
+            result = op->defaults_tuple;
+        } else {
+            result = Py_None;
+        }
+    }
+    Py_INCREF(result);
+    return result;
+}
+static int
+__Pyx_CyFunction_set_kwdefaults(__pyx_CyFunctionObject *op, PyObject* value) {
+    PyObject* tmp;
+    if (!value) {
+        value = Py_None;
+    } else if (value != Py_None && !PyDict_Check(value)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "__kwdefaults__ must be set to a dict object");
+        return -1;
+    }
+    Py_INCREF(value);
+    tmp = op->defaults_kwdict;
+    op->defaults_kwdict = value;
+    Py_XDECREF(tmp);
+    return 0;
+}
+static PyObject *
+__Pyx_CyFunction_get_kwdefaults(__pyx_CyFunctionObject *op) {
+    PyObject* result = op->defaults_kwdict;
+    if (unlikely(!result)) {
+        if (op->defaults_getter) {
+            if (__Pyx_CyFunction_init_defaults(op) < 0) return NULL;
+            result = op->defaults_kwdict;
+        } else {
+            result = Py_None;
+        }
+    }
+    Py_INCREF(result);
+    return result;
+}
+static int
+__Pyx_CyFunction_set_annotations(__pyx_CyFunctionObject *op, PyObject* value) {
+    PyObject* tmp;
+    if (!value || value == Py_None) {
+        value = NULL;
+    } else if (!PyDict_Check(value)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "__annotations__ must be set to a dict object");
+        return -1;
+    }
+    Py_XINCREF(value);
+    tmp = op->func_annotations;
+    op->func_annotations = value;
+    Py_XDECREF(tmp);
+    return 0;
+}
+static PyObject *
+__Pyx_CyFunction_get_annotations(__pyx_CyFunctionObject *op) {
+    PyObject* result = op->func_annotations;
+    if (unlikely(!result)) {
+        result = PyDict_New();
+        if (unlikely(!result)) return NULL;
+        op->func_annotations = result;
+    }
+    Py_INCREF(result);
+    return result;
+}
+static PyGetSetDef __pyx_CyFunction_getsets[] = {
+    {(char *) "func_doc", (getter)__Pyx_CyFunction_get_doc, (setter)__Pyx_CyFunction_set_doc, 0, 0},
+    {(char *) "__doc__",  (getter)__Pyx_CyFunction_get_doc, (setter)__Pyx_CyFunction_set_doc, 0, 0},
+    {(char *) "func_name", (getter)__Pyx_CyFunction_get_name, (setter)__Pyx_CyFunction_set_name, 0, 0},
+    {(char *) "__name__", (getter)__Pyx_CyFunction_get_name, (setter)__Pyx_CyFunction_set_name, 0, 0},
+    {(char *) "__qualname__", (getter)__Pyx_CyFunction_get_qualname, (setter)__Pyx_CyFunction_set_qualname, 0, 0},
+    {(char *) "__self__", (getter)__Pyx_CyFunction_get_self, 0, 0, 0},
+    {(char *) "func_dict", (getter)__Pyx_CyFunction_get_dict, (setter)__Pyx_CyFunction_set_dict, 0, 0},
+    {(char *) "__dict__", (getter)__Pyx_CyFunction_get_dict, (setter)__Pyx_CyFunction_set_dict, 0, 0},
+    {(char *) "func_globals", (getter)__Pyx_CyFunction_get_globals, 0, 0, 0},
+    {(char *) "__globals__", (getter)__Pyx_CyFunction_get_globals, 0, 0, 0},
+    {(char *) "func_closure", (getter)__Pyx_CyFunction_get_closure, 0, 0, 0},
+    {(char *) "__closure__", (getter)__Pyx_CyFunction_get_closure, 0, 0, 0},
+    {(char *) "func_code", (getter)__Pyx_CyFunction_get_code, 0, 0, 0},
+    {(char *) "__code__", (getter)__Pyx_CyFunction_get_code, 0, 0, 0},
+    {(char *) "func_defaults", (getter)__Pyx_CyFunction_get_defaults, (setter)__Pyx_CyFunction_set_defaults, 0, 0},
+    {(char *) "__defaults__", (getter)__Pyx_CyFunction_get_defaults, (setter)__Pyx_CyFunction_set_defaults, 0, 0},
+    {(char *) "__kwdefaults__", (getter)__Pyx_CyFunction_get_kwdefaults, (setter)__Pyx_CyFunction_set_kwdefaults, 0, 0},
+    {(char *) "__annotations__", (getter)__Pyx_CyFunction_get_annotations, (setter)__Pyx_CyFunction_set_annotations, 0, 0},
+    {0, 0, 0, 0, 0}
+};
+#ifndef PY_WRITE_RESTRICTED /* < Py2.5 */
+#define PY_WRITE_RESTRICTED WRITE_RESTRICTED
+#endif
+static PyMemberDef __pyx_CyFunction_members[] = {
+    {(char *) "__module__", T_OBJECT, offsetof(__pyx_CyFunctionObject, func.m_module), PY_WRITE_RESTRICTED, 0},
+    {0, 0, 0,  0, 0}
+};
+static PyObject *
+__Pyx_CyFunction_reduce(__pyx_CyFunctionObject *m, CYTHON_UNUSED PyObject *args)
+{
+#if PY_MAJOR_VERSION >= 3
+    return PyUnicode_FromString(m->func.m_ml->ml_name);
+#else
+    return PyString_FromString(m->func.m_ml->ml_name);
+#endif
+}
+static PyMethodDef __pyx_CyFunction_methods[] = {
+    {__Pyx_NAMESTR("__reduce__"), (PyCFunction)__Pyx_CyFunction_reduce, METH_VARARGS, 0},
+    {0, 0, 0, 0}
+};
+static PyObject *__Pyx_CyFunction_New(PyTypeObject *type, PyMethodDef *ml, int flags, PyObject* qualname,
+                                      PyObject *closure, PyObject *module, PyObject* code) {
+    __pyx_CyFunctionObject *op = PyObject_GC_New(__pyx_CyFunctionObject, type);
+    if (op == NULL)
+        return NULL;
+    op->flags = flags;
+    op->func_weakreflist = NULL;
+    op->func.m_ml = ml;
+    op->func.m_self = (PyObject *) op;
+    Py_XINCREF(closure);
+    op->func_closure = closure;
+    Py_XINCREF(module);
+    op->func.m_module = module;
+    op->func_dict = NULL;
+    op->func_name = NULL;
+    Py_INCREF(qualname);
+    op->func_qualname = qualname;
+    op->func_doc = NULL;
+    op->func_classobj = NULL;
+    Py_XINCREF(code);
+    op->func_code = code;
+    op->defaults_pyobjects = 0;
+    op->defaults = NULL;
+    op->defaults_tuple = NULL;
+    op->defaults_kwdict = NULL;
+    op->defaults_getter = NULL;
+    op->func_annotations = NULL;
+    PyObject_GC_Track(op);
+    return (PyObject *) op;
+}
+static int
+__Pyx_CyFunction_clear(__pyx_CyFunctionObject *m)
+{
+    Py_CLEAR(m->func_closure);
+    Py_CLEAR(m->func.m_module);
+    Py_CLEAR(m->func_dict);
+    Py_CLEAR(m->func_name);
+    Py_CLEAR(m->func_qualname);
+    Py_CLEAR(m->func_doc);
+    Py_CLEAR(m->func_code);
+    Py_CLEAR(m->func_classobj);
+    Py_CLEAR(m->defaults_tuple);
+    Py_CLEAR(m->defaults_kwdict);
+    Py_CLEAR(m->func_annotations);
+    if (m->defaults) {
+        PyObject **pydefaults = __Pyx_CyFunction_Defaults(PyObject *, m);
+        int i;
+        for (i = 0; i < m->defaults_pyobjects; i++)
+            Py_XDECREF(pydefaults[i]);
+        PyMem_Free(m->defaults);
+        m->defaults = NULL;
+    }
+    return 0;
+}
+static void __Pyx_CyFunction_dealloc(__pyx_CyFunctionObject *m)
+{
+    PyObject_GC_UnTrack(m);
+    if (m->func_weakreflist != NULL)
+        PyObject_ClearWeakRefs((PyObject *) m);
+    __Pyx_CyFunction_clear(m);
+    PyObject_GC_Del(m);
+}
+static int __Pyx_CyFunction_traverse(__pyx_CyFunctionObject *m, visitproc visit, void *arg)
+{
+    Py_VISIT(m->func_closure);
+    Py_VISIT(m->func.m_module);
+    Py_VISIT(m->func_dict);
+    Py_VISIT(m->func_name);
+    Py_VISIT(m->func_qualname);
+    Py_VISIT(m->func_doc);
+    Py_VISIT(m->func_code);
+    Py_VISIT(m->func_classobj);
+    Py_VISIT(m->defaults_tuple);
+    Py_VISIT(m->defaults_kwdict);
+    if (m->defaults) {
+        PyObject **pydefaults = __Pyx_CyFunction_Defaults(PyObject *, m);
+        int i;
+        for (i = 0; i < m->defaults_pyobjects; i++)
+            Py_VISIT(pydefaults[i]);
+    }
+    return 0;
+}
+static PyObject *__Pyx_CyFunction_descr_get(PyObject *func, PyObject *obj, PyObject *type)
+{
+    __pyx_CyFunctionObject *m = (__pyx_CyFunctionObject *) func;
+    if (m->flags & __Pyx_CYFUNCTION_STATICMETHOD) {
+        Py_INCREF(func);
+        return func;
+    }
+    if (m->flags & __Pyx_CYFUNCTION_CLASSMETHOD) {
+        if (type == NULL)
+            type = (PyObject *)(Py_TYPE(obj));
+        return PyMethod_New(func,
+                            type, (PyObject *)(Py_TYPE(type)));
+    }
+    if (obj == Py_None)
+        obj = NULL;
+    return PyMethod_New(func, obj, type);
+}
+static PyObject*
+__Pyx_CyFunction_repr(__pyx_CyFunctionObject *op)
+{
+#if PY_MAJOR_VERSION >= 3
+    return PyUnicode_FromFormat("<cyfunction %U at %p>",
+                                op->func_qualname, (void *)op);
+#else
+    return PyString_FromFormat("<cyfunction %s at %p>",
+                               PyString_AsString(op->func_qualname), (void *)op);
+#endif
+}
+#if CYTHON_COMPILING_IN_PYPY
+static PyObject * __Pyx_CyFunction_Call(PyObject *func, PyObject *arg, PyObject *kw) {
+    PyCFunctionObject* f = (PyCFunctionObject*)func;
+    PyCFunction meth = PyCFunction_GET_FUNCTION(func);
+    PyObject *self = PyCFunction_GET_SELF(func);
+    Py_ssize_t size;
+    switch (PyCFunction_GET_FLAGS(func) & ~(METH_CLASS | METH_STATIC | METH_COEXIST)) {
+    case METH_VARARGS:
+        if (likely(kw == NULL) || PyDict_Size(kw) == 0)
+            return (*meth)(self, arg);
+        break;
+    case METH_VARARGS | METH_KEYWORDS:
+        return (*(PyCFunctionWithKeywords)meth)(self, arg, kw);
+    case METH_NOARGS:
+        if (likely(kw == NULL) || PyDict_Size(kw) == 0) {
+            size = PyTuple_GET_SIZE(arg);
+            if (size == 0)
+                return (*meth)(self, NULL);
+            PyErr_Format(PyExc_TypeError,
+                "%.200s() takes no arguments (%zd given)",
+                f->m_ml->ml_name, size);
+            return NULL;
+        }
+        break;
+    case METH_O:
+        if (likely(kw == NULL) || PyDict_Size(kw) == 0) {
+            size = PyTuple_GET_SIZE(arg);
+            if (size == 1)
+                return (*meth)(self, PyTuple_GET_ITEM(arg, 0));
+            PyErr_Format(PyExc_TypeError,
+                "%.200s() takes exactly one argument (%zd given)",
+                f->m_ml->ml_name, size);
+            return NULL;
+        }
+        break;
+    default:
+        PyErr_SetString(PyExc_SystemError, "Bad call flags in "
+                        "__Pyx_CyFunction_Call. METH_OLDARGS is no "
+                        "longer supported!");
+        return NULL;
+    }
+    PyErr_Format(PyExc_TypeError, "%.200s() takes no keyword arguments",
+                 f->m_ml->ml_name);
+    return NULL;
+}
+#else
+static PyObject * __Pyx_CyFunction_Call(PyObject *func, PyObject *arg, PyObject *kw) {
+	return PyCFunction_Call(func, arg, kw);
+}
+#endif
+static PyTypeObject __pyx_CyFunctionType_type = {
+    PyVarObject_HEAD_INIT(0, 0)
+    __Pyx_NAMESTR("cython_function_or_method"), /*tp_name*/
+    sizeof(__pyx_CyFunctionObject),   /*tp_basicsize*/
+    0,                                  /*tp_itemsize*/
+    (destructor) __Pyx_CyFunction_dealloc, /*tp_dealloc*/
+    0,                                  /*tp_print*/
+    0,                                  /*tp_getattr*/
+    0,                                  /*tp_setattr*/
+#if PY_MAJOR_VERSION < 3
+    0,                                  /*tp_compare*/
+#else
+    0,                                  /*reserved*/
+#endif
+    (reprfunc) __Pyx_CyFunction_repr,   /*tp_repr*/
+    0,                                  /*tp_as_number*/
+    0,                                  /*tp_as_sequence*/
+    0,                                  /*tp_as_mapping*/
+    0,                                  /*tp_hash*/
+    __Pyx_CyFunction_Call,              /*tp_call*/
+    0,                                  /*tp_str*/
+    0,                                  /*tp_getattro*/
+    0,                                  /*tp_setattro*/
+    0,                                  /*tp_as_buffer*/
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags*/
+    0,                                  /*tp_doc*/
+    (traverseproc) __Pyx_CyFunction_traverse,   /*tp_traverse*/
+    (inquiry) __Pyx_CyFunction_clear,   /*tp_clear*/
+    0,                                  /*tp_richcompare*/
+    offsetof(__pyx_CyFunctionObject, func_weakreflist), /* tp_weaklistoffse */
+    0,                                  /*tp_iter*/
+    0,                                  /*tp_iternext*/
+    __pyx_CyFunction_methods,           /*tp_methods*/
+    __pyx_CyFunction_members,           /*tp_members*/
+    __pyx_CyFunction_getsets,           /*tp_getset*/
+    0,                                  /*tp_base*/
+    0,                                  /*tp_dict*/
+    __Pyx_CyFunction_descr_get,         /*tp_descr_get*/
+    0,                                  /*tp_descr_set*/
+    offsetof(__pyx_CyFunctionObject, func_dict),/*tp_dictoffset*/
+    0,                                  /*tp_init*/
+    0,                                  /*tp_alloc*/
+    0,                                  /*tp_new*/
+    0,                                  /*tp_free*/
+    0,                                  /*tp_is_gc*/
+    0,                                  /*tp_bases*/
+    0,                                  /*tp_mro*/
+    0,                                  /*tp_cache*/
+    0,                                  /*tp_subclasses*/
+    0,                                  /*tp_weaklist*/
+    0,                                  /*tp_del*/
+#if PY_VERSION_HEX >= 0x02060000
+    0,                                  /*tp_version_tag*/
+#endif
+};
+static int __Pyx_CyFunction_init(void) {
+#if !CYTHON_COMPILING_IN_PYPY
+    __pyx_CyFunctionType_type.tp_call = PyCFunction_Call;
+#endif
+    if (PyType_Ready(&__pyx_CyFunctionType_type) < 0)
+        return -1;
+    __pyx_CyFunctionType = &__pyx_CyFunctionType_type;
+    return 0;
+}
+static CYTHON_INLINE void *__Pyx_CyFunction_InitDefaults(PyObject *func, size_t size, int pyobjects) {
+    __pyx_CyFunctionObject *m = (__pyx_CyFunctionObject *) func;
+    m->defaults = PyMem_Malloc(size);
+    if (!m->defaults)
+        return PyErr_NoMemory();
+    memset(m->defaults, 0, size);
+    m->defaults_pyobjects = pyobjects;
+    return m->defaults;
+}
+static CYTHON_INLINE void __Pyx_CyFunction_SetDefaultsTuple(PyObject *func, PyObject *tuple) {
+    __pyx_CyFunctionObject *m = (__pyx_CyFunctionObject *) func;
+    m->defaults_tuple = tuple;
+    Py_INCREF(tuple);
+}
+static CYTHON_INLINE void __Pyx_CyFunction_SetDefaultsKwDict(PyObject *func, PyObject *dict) {
+    __pyx_CyFunctionObject *m = (__pyx_CyFunctionObject *) func;
+    m->defaults_kwdict = dict;
+    Py_INCREF(dict);
+}
+static CYTHON_INLINE void __Pyx_CyFunction_SetAnnotationsDict(PyObject *func, PyObject *dict) {
+    __pyx_CyFunctionObject *m = (__pyx_CyFunctionObject *) func;
+    m->func_annotations = dict;
+    Py_INCREF(dict);
+}
+
+static int __Pyx_GetException(PyObject **type, PyObject **value, PyObject **tb) {
+    PyObject *local_type, *local_value, *local_tb;
+#if CYTHON_COMPILING_IN_CPYTHON
+    PyObject *tmp_type, *tmp_value, *tmp_tb;
+    PyThreadState *tstate = PyThreadState_GET();
+    local_type = tstate->curexc_type;
+    local_value = tstate->curexc_value;
+    local_tb = tstate->curexc_traceback;
+    tstate->curexc_type = 0;
+    tstate->curexc_value = 0;
+    tstate->curexc_traceback = 0;
+#else
+    PyErr_Fetch(&local_type, &local_value, &local_tb);
+#endif
+    PyErr_NormalizeException(&local_type, &local_value, &local_tb);
+#if CYTHON_COMPILING_IN_CPYTHON
+    if (unlikely(tstate->curexc_type))
+#else
+    if (unlikely(PyErr_Occurred()))
+#endif
+        goto bad;
+    #if PY_MAJOR_VERSION >= 3
+    if (unlikely(PyException_SetTraceback(local_value, local_tb) < 0))
+        goto bad;
+    #endif
+    Py_INCREF(local_type);
+    Py_INCREF(local_value);
+    Py_INCREF(local_tb);
+    *type = local_type;
+    *value = local_value;
+    *tb = local_tb;
+#if CYTHON_COMPILING_IN_CPYTHON
+    tmp_type = tstate->exc_type;
+    tmp_value = tstate->exc_value;
+    tmp_tb = tstate->exc_traceback;
+    tstate->exc_type = local_type;
+    tstate->exc_value = local_value;
+    tstate->exc_traceback = local_tb;
+    /* Make sure tstate is in a consistent state when we XDECREF
+       these objects (DECREF may run arbitrary code). */
+    Py_XDECREF(tmp_type);
+    Py_XDECREF(tmp_value);
+    Py_XDECREF(tmp_tb);
+#else
+    PyErr_SetExcInfo(local_type, local_value, local_tb);
+#endif
+    return 0;
+bad:
+    *type = 0;
+    *value = 0;
+    *tb = 0;
+    Py_XDECREF(local_type);
+    Py_XDECREF(local_value);
+    Py_XDECREF(local_tb);
+    return -1;
+}
+
+static PyObject* __Pyx_ImportFrom(PyObject* module, PyObject* name) {
+    PyObject* value = __Pyx_PyObject_GetAttrStr(module, name);
+    if (unlikely(!value) && PyErr_ExceptionMatches(PyExc_AttributeError)) {
+        PyErr_Format(PyExc_ImportError,
+        #if PY_MAJOR_VERSION < 3
+            "cannot import name %.230s", PyString_AS_STRING(name));
+        #else
+            "cannot import name %S", name);
+        #endif
+    }
+    return value;
+}
+
+static CYTHON_INLINE void __Pyx_ExceptionSave(PyObject **type, PyObject **value, PyObject **tb) {
+#if CYTHON_COMPILING_IN_CPYTHON
+    PyThreadState *tstate = PyThreadState_GET();
+    *type = tstate->exc_type;
+    *value = tstate->exc_value;
+    *tb = tstate->exc_traceback;
+    Py_XINCREF(*type);
+    Py_XINCREF(*value);
+    Py_XINCREF(*tb);
+#else
+    PyErr_GetExcInfo(type, value, tb);
+#endif
+}
+static void __Pyx_ExceptionReset(PyObject *type, PyObject *value, PyObject *tb) {
+#if CYTHON_COMPILING_IN_CPYTHON
+    PyObject *tmp_type, *tmp_value, *tmp_tb;
+    PyThreadState *tstate = PyThreadState_GET();
+    tmp_type = tstate->exc_type;
+    tmp_value = tstate->exc_value;
+    tmp_tb = tstate->exc_traceback;
+    tstate->exc_type = type;
+    tstate->exc_value = value;
+    tstate->exc_traceback = tb;
+    Py_XDECREF(tmp_type);
+    Py_XDECREF(tmp_value);
+    Py_XDECREF(tmp_tb);
+#else
+    PyErr_SetExcInfo(type, value, tb);
+#endif
+}
+
+static PyObject *__Pyx_Import(PyObject *name, PyObject *from_list, int level) {
+    PyObject *empty_list = 0;
+    PyObject *module = 0;
+    PyObject *global_dict = 0;
+    PyObject *empty_dict = 0;
+    PyObject *list;
+    #if PY_VERSION_HEX < 0x03030000
+    PyObject *py_import;
+    py_import = __Pyx_PyObject_GetAttrStr(__pyx_b, __pyx_n_s____import__);
+    if (!py_import)
+        goto bad;
+    #endif
+    if (from_list)
+        list = from_list;
+    else {
+        empty_list = PyList_New(0);
+        if (!empty_list)
+            goto bad;
+        list = empty_list;
+    }
+    global_dict = PyModule_GetDict(__pyx_m);
+    if (!global_dict)
+        goto bad;
+    empty_dict = PyDict_New();
+    if (!empty_dict)
+        goto bad;
+    #if PY_VERSION_HEX >= 0x02050000
+    {
+        #if PY_MAJOR_VERSION >= 3
+        if (level == -1) {
+            if (strchr(__Pyx_MODULE_NAME, '.')) {
+                #if PY_VERSION_HEX < 0x03030000
+                PyObject *py_level = PyInt_FromLong(1);
+                if (!py_level)
+                    goto bad;
+                module = PyObject_CallFunctionObjArgs(py_import,
+                    name, global_dict, empty_dict, list, py_level, NULL);
+                Py_DECREF(py_level);
+                #else
+                module = PyImport_ImportModuleLevelObject(
+                    name, global_dict, empty_dict, list, 1);
+                #endif
+                if (!module) {
+                    if (!PyErr_ExceptionMatches(PyExc_ImportError))
+                        goto bad;
+                    PyErr_Clear();
+                }
+            }
+            level = 0; /* try absolute import on failure */
+        }
+        #endif
+        if (!module) {
+            #if PY_VERSION_HEX < 0x03030000
+            PyObject *py_level = PyInt_FromLong(level);
+            if (!py_level)
+                goto bad;
+            module = PyObject_CallFunctionObjArgs(py_import,
+                name, global_dict, empty_dict, list, py_level, NULL);
+            Py_DECREF(py_level);
+            #else
+            module = PyImport_ImportModuleLevelObject(
+                name, global_dict, empty_dict, list, level);
+            #endif
+        }
+    }
+    #else
+    if (level>0) {
+        PyErr_SetString(PyExc_RuntimeError, "Relative import is not supported for Python <=2.4.");
+        goto bad;
+    }
+    module = PyObject_CallFunctionObjArgs(py_import,
+        name, global_dict, empty_dict, list, NULL);
+    #endif
+bad:
+    #if PY_VERSION_HEX < 0x03030000
+    Py_XDECREF(py_import);
+    #endif
+    Py_XDECREF(empty_list);
+    Py_XDECREF(empty_dict);
+    return module;
+}
+
+static CYTHON_INLINE int64_t __Pyx_PyInt_from_py_int64_t(PyObject* x) {
+    const int64_t neg_one = (int64_t)-1, const_zero = (int64_t)0;
+    const int is_unsigned = const_zero < neg_one;
+    if (sizeof(int64_t) == sizeof(char)) {
+        if (is_unsigned)
+            return (int64_t)__Pyx_PyInt_AsUnsignedChar(x);
+        else
+            return (int64_t)__Pyx_PyInt_AsSignedChar(x);
+    } else if (sizeof(int64_t) == sizeof(short)) {
+        if (is_unsigned)
+            return (int64_t)__Pyx_PyInt_AsUnsignedShort(x);
+        else
+            return (int64_t)__Pyx_PyInt_AsSignedShort(x);
+    } else if (sizeof(int64_t) == sizeof(int)) {
+        if (is_unsigned)
+            return (int64_t)__Pyx_PyInt_AsUnsignedInt(x);
+        else
+            return (int64_t)__Pyx_PyInt_AsSignedInt(x);
+    } else if (sizeof(int64_t) == sizeof(long)) {
+        if (is_unsigned)
+            return (int64_t)__Pyx_PyInt_AsUnsignedLong(x);
+        else
+            return (int64_t)__Pyx_PyInt_AsSignedLong(x);
+    } else if (sizeof(int64_t) == sizeof(PY_LONG_LONG)) {
+        if (is_unsigned)
+            return (int64_t)__Pyx_PyInt_AsUnsignedLongLong(x);
+        else
+            return (int64_t)__Pyx_PyInt_AsSignedLongLong(x);
+    }  else {
+        #if CYTHON_COMPILING_IN_PYPY && !defined(_PyLong_AsByteArray)
+        PyErr_SetString(PyExc_RuntimeError,
+                        "_PyLong_AsByteArray() not available in PyPy, cannot convert large numbers");
+        #else
+        int64_t val;
+        PyObject *v = __Pyx_PyNumber_Int(x);
+        #if PY_MAJOR_VERSION < 3
+        if (likely(v) && !PyLong_Check(v)) {
+            PyObject *tmp = v;
+            v = PyNumber_Long(tmp);
+            Py_DECREF(tmp);
+        }
+        #endif
+        if (likely(v)) {
+            int one = 1; int is_little = (int)*(unsigned char *)&one;
+            unsigned char *bytes = (unsigned char *)&val;
+            int ret = _PyLong_AsByteArray((PyLongObject *)v,
+                                          bytes, sizeof(val),
+                                          is_little, !is_unsigned);
+            Py_DECREF(v);
+            if (likely(!ret))
+                return val;
+        }
+        #endif
+        return (int64_t)-1;
+    }
+}
+
+static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_int64_t(int64_t val) {
+    const int64_t neg_one = (int64_t)-1, const_zero = (int64_t)0;
+    const int is_unsigned = const_zero < neg_one;
+    if ((sizeof(int64_t) == sizeof(char))  ||
+        (sizeof(int64_t) == sizeof(short))) {
+        return PyInt_FromLong((long)val);
+    } else if ((sizeof(int64_t) == sizeof(int)) ||
+               (sizeof(int64_t) == sizeof(long))) {
+        if (is_unsigned)
+            return PyLong_FromUnsignedLong((unsigned long)val);
+        else
+            return PyInt_FromLong((long)val);
+    } else if (sizeof(int64_t) == sizeof(PY_LONG_LONG)) {
+        if (is_unsigned)
+            return PyLong_FromUnsignedLongLong((unsigned PY_LONG_LONG)val);
+        else
+            return PyLong_FromLongLong((PY_LONG_LONG)val);
+    } else {
+        int one = 1; int little = (int)*(unsigned char *)&one;
+        unsigned char *bytes = (unsigned char *)&val;
+        return _PyLong_FromByteArray(bytes, sizeof(int64_t),
+                                     little, !is_unsigned);
+    }
+}
+
+static CYTHON_INLINE unsigned char __Pyx_PyInt_AsUnsignedChar(PyObject* x) {
+    const unsigned char neg_one = (unsigned char)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(unsigned char) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(unsigned char)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to unsigned char" :
+                    "value too large to convert to unsigned char");
+            }
+            return (unsigned char)-1;
+        }
+        return (unsigned char)val;
+    }
+    return (unsigned char)__Pyx_PyInt_AsUnsignedLong(x);
+}
+
+static CYTHON_INLINE unsigned short __Pyx_PyInt_AsUnsignedShort(PyObject* x) {
+    const unsigned short neg_one = (unsigned short)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(unsigned short) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(unsigned short)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to unsigned short" :
+                    "value too large to convert to unsigned short");
+            }
+            return (unsigned short)-1;
+        }
+        return (unsigned short)val;
+    }
+    return (unsigned short)__Pyx_PyInt_AsUnsignedLong(x);
+}
+
+static CYTHON_INLINE unsigned int __Pyx_PyInt_AsUnsignedInt(PyObject* x) {
+    const unsigned int neg_one = (unsigned int)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(unsigned int) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(unsigned int)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to unsigned int" :
+                    "value too large to convert to unsigned int");
+            }
+            return (unsigned int)-1;
+        }
+        return (unsigned int)val;
+    }
+    return (unsigned int)__Pyx_PyInt_AsUnsignedLong(x);
+}
+
+static CYTHON_INLINE char __Pyx_PyInt_AsChar(PyObject* x) {
+    const char neg_one = (char)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(char) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(char)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to char" :
+                    "value too large to convert to char");
+            }
+            return (char)-1;
+        }
+        return (char)val;
+    }
+    return (char)__Pyx_PyInt_AsLong(x);
+}
+
+static CYTHON_INLINE short __Pyx_PyInt_AsShort(PyObject* x) {
+    const short neg_one = (short)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(short) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(short)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to short" :
+                    "value too large to convert to short");
+            }
+            return (short)-1;
+        }
+        return (short)val;
+    }
+    return (short)__Pyx_PyInt_AsLong(x);
+}
+
+static CYTHON_INLINE int __Pyx_PyInt_AsInt(PyObject* x) {
+    const int neg_one = (int)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(int) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(int)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to int" :
+                    "value too large to convert to int");
+            }
+            return (int)-1;
+        }
+        return (int)val;
+    }
+    return (int)__Pyx_PyInt_AsLong(x);
+}
+
+static CYTHON_INLINE signed char __Pyx_PyInt_AsSignedChar(PyObject* x) {
+    const signed char neg_one = (signed char)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(signed char) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(signed char)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to signed char" :
+                    "value too large to convert to signed char");
+            }
+            return (signed char)-1;
+        }
+        return (signed char)val;
+    }
+    return (signed char)__Pyx_PyInt_AsSignedLong(x);
+}
+
+static CYTHON_INLINE signed short __Pyx_PyInt_AsSignedShort(PyObject* x) {
+    const signed short neg_one = (signed short)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(signed short) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(signed short)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to signed short" :
+                    "value too large to convert to signed short");
+            }
+            return (signed short)-1;
+        }
+        return (signed short)val;
+    }
+    return (signed short)__Pyx_PyInt_AsSignedLong(x);
+}
+
+static CYTHON_INLINE signed int __Pyx_PyInt_AsSignedInt(PyObject* x) {
+    const signed int neg_one = (signed int)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(signed int) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(signed int)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to signed int" :
+                    "value too large to convert to signed int");
+            }
+            return (signed int)-1;
+        }
+        return (signed int)val;
+    }
+    return (signed int)__Pyx_PyInt_AsSignedLong(x);
+}
+
+static CYTHON_INLINE int __Pyx_PyInt_AsLongDouble(PyObject* x) {
+    const int neg_one = (int)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(int) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(int)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to int" :
+                    "value too large to convert to int");
+            }
+            return (int)-1;
+        }
+        return (int)val;
+    }
+    return (int)__Pyx_PyInt_AsLong(x);
+}
+
+#if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3
+#if CYTHON_USE_PYLONG_INTERNALS
+#include "longintrepr.h"
+#endif
+#endif
+static CYTHON_INLINE unsigned long __Pyx_PyInt_AsUnsignedLong(PyObject* x) {
+    const unsigned long neg_one = (unsigned long)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_MAJOR_VERSION < 3
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to unsigned long");
+            return (unsigned long)-1;
+        }
+        return (unsigned long)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+#if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3
+#if CYTHON_USE_PYLONG_INTERNALS
+            if (sizeof(digit) <= sizeof(unsigned long)) {
+                switch (Py_SIZE(x)) {
+                    case  0: return 0;
+                    case  1: return (unsigned long) ((PyLongObject*)x)->ob_digit[0];
+                }
+            }
+#endif
+#endif
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to unsigned long");
+                return (unsigned long)-1;
+            }
+            return (unsigned long)PyLong_AsUnsignedLong(x);
+        } else {
+#if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3
+#if CYTHON_USE_PYLONG_INTERNALS
+            if (sizeof(digit) <= sizeof(unsigned long)) {
+                switch (Py_SIZE(x)) {
+                    case  0: return 0;
+                    case  1: return +(unsigned long) ((PyLongObject*)x)->ob_digit[0];
+                    case -1: return -(unsigned long) ((PyLongObject*)x)->ob_digit[0];
+                }
+            }
+#endif
+#endif
+            return (unsigned long)PyLong_AsLong(x);
+        }
+    } else {
+        unsigned long val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (unsigned long)-1;
+        val = __Pyx_PyInt_AsUnsignedLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+#if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3
+#if CYTHON_USE_PYLONG_INTERNALS
+#include "longintrepr.h"
+#endif
+#endif
+static CYTHON_INLINE unsigned PY_LONG_LONG __Pyx_PyInt_AsUnsignedLongLong(PyObject* x) {
+    const unsigned PY_LONG_LONG neg_one = (unsigned PY_LONG_LONG)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_MAJOR_VERSION < 3
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to unsigned PY_LONG_LONG");
+            return (unsigned PY_LONG_LONG)-1;
+        }
+        return (unsigned PY_LONG_LONG)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+#if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3
+#if CYTHON_USE_PYLONG_INTERNALS
+            if (sizeof(digit) <= sizeof(unsigned PY_LONG_LONG)) {
+                switch (Py_SIZE(x)) {
+                    case  0: return 0;
+                    case  1: return (unsigned PY_LONG_LONG) ((PyLongObject*)x)->ob_digit[0];
+                }
+            }
+#endif
+#endif
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to unsigned PY_LONG_LONG");
+                return (unsigned PY_LONG_LONG)-1;
+            }
+            return (unsigned PY_LONG_LONG)PyLong_AsUnsignedLongLong(x);
+        } else {
+#if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3
+#if CYTHON_USE_PYLONG_INTERNALS
+            if (sizeof(digit) <= sizeof(unsigned PY_LONG_LONG)) {
+                switch (Py_SIZE(x)) {
+                    case  0: return 0;
+                    case  1: return +(unsigned PY_LONG_LONG) ((PyLongObject*)x)->ob_digit[0];
+                    case -1: return -(unsigned PY_LONG_LONG) ((PyLongObject*)x)->ob_digit[0];
+                }
+            }
+#endif
+#endif
+            return (unsigned PY_LONG_LONG)PyLong_AsLongLong(x);
+        }
+    } else {
+        unsigned PY_LONG_LONG val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (unsigned PY_LONG_LONG)-1;
+        val = __Pyx_PyInt_AsUnsignedLongLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+#if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3
+#if CYTHON_USE_PYLONG_INTERNALS
+#include "longintrepr.h"
+#endif
+#endif
+static CYTHON_INLINE long __Pyx_PyInt_AsLong(PyObject* x) {
+    const long neg_one = (long)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_MAJOR_VERSION < 3
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to long");
+            return (long)-1;
+        }
+        return (long)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+#if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3
+#if CYTHON_USE_PYLONG_INTERNALS
+            if (sizeof(digit) <= sizeof(long)) {
+                switch (Py_SIZE(x)) {
+                    case  0: return 0;
+                    case  1: return (long) ((PyLongObject*)x)->ob_digit[0];
+                }
+            }
+#endif
+#endif
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to long");
+                return (long)-1;
+            }
+            return (long)PyLong_AsUnsignedLong(x);
+        } else {
+#if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3
+#if CYTHON_USE_PYLONG_INTERNALS
+            if (sizeof(digit) <= sizeof(long)) {
+                switch (Py_SIZE(x)) {
+                    case  0: return 0;
+                    case  1: return +(long) ((PyLongObject*)x)->ob_digit[0];
+                    case -1: return -(long) ((PyLongObject*)x)->ob_digit[0];
+                }
+            }
+#endif
+#endif
+            return (long)PyLong_AsLong(x);
+        }
+    } else {
+        long val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (long)-1;
+        val = __Pyx_PyInt_AsLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+#if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3
+#if CYTHON_USE_PYLONG_INTERNALS
+#include "longintrepr.h"
+#endif
+#endif
+static CYTHON_INLINE PY_LONG_LONG __Pyx_PyInt_AsLongLong(PyObject* x) {
+    const PY_LONG_LONG neg_one = (PY_LONG_LONG)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_MAJOR_VERSION < 3
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to PY_LONG_LONG");
+            return (PY_LONG_LONG)-1;
+        }
+        return (PY_LONG_LONG)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+#if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3
+#if CYTHON_USE_PYLONG_INTERNALS
+            if (sizeof(digit) <= sizeof(PY_LONG_LONG)) {
+                switch (Py_SIZE(x)) {
+                    case  0: return 0;
+                    case  1: return (PY_LONG_LONG) ((PyLongObject*)x)->ob_digit[0];
+                }
+            }
+#endif
+#endif
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to PY_LONG_LONG");
+                return (PY_LONG_LONG)-1;
+            }
+            return (PY_LONG_LONG)PyLong_AsUnsignedLongLong(x);
+        } else {
+#if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3
+#if CYTHON_USE_PYLONG_INTERNALS
+            if (sizeof(digit) <= sizeof(PY_LONG_LONG)) {
+                switch (Py_SIZE(x)) {
+                    case  0: return 0;
+                    case  1: return +(PY_LONG_LONG) ((PyLongObject*)x)->ob_digit[0];
+                    case -1: return -(PY_LONG_LONG) ((PyLongObject*)x)->ob_digit[0];
+                }
+            }
+#endif
+#endif
+            return (PY_LONG_LONG)PyLong_AsLongLong(x);
+        }
+    } else {
+        PY_LONG_LONG val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (PY_LONG_LONG)-1;
+        val = __Pyx_PyInt_AsLongLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+#if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3
+#if CYTHON_USE_PYLONG_INTERNALS
+#include "longintrepr.h"
+#endif
+#endif
+static CYTHON_INLINE signed long __Pyx_PyInt_AsSignedLong(PyObject* x) {
+    const signed long neg_one = (signed long)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_MAJOR_VERSION < 3
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to signed long");
+            return (signed long)-1;
+        }
+        return (signed long)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+#if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3
+#if CYTHON_USE_PYLONG_INTERNALS
+            if (sizeof(digit) <= sizeof(signed long)) {
+                switch (Py_SIZE(x)) {
+                    case  0: return 0;
+                    case  1: return (signed long) ((PyLongObject*)x)->ob_digit[0];
+                }
+            }
+#endif
+#endif
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to signed long");
+                return (signed long)-1;
+            }
+            return (signed long)PyLong_AsUnsignedLong(x);
+        } else {
+#if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3
+#if CYTHON_USE_PYLONG_INTERNALS
+            if (sizeof(digit) <= sizeof(signed long)) {
+                switch (Py_SIZE(x)) {
+                    case  0: return 0;
+                    case  1: return +(signed long) ((PyLongObject*)x)->ob_digit[0];
+                    case -1: return -(signed long) ((PyLongObject*)x)->ob_digit[0];
+                }
+            }
+#endif
+#endif
+            return (signed long)PyLong_AsLong(x);
+        }
+    } else {
+        signed long val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (signed long)-1;
+        val = __Pyx_PyInt_AsSignedLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+#if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3
+#if CYTHON_USE_PYLONG_INTERNALS
+#include "longintrepr.h"
+#endif
+#endif
+static CYTHON_INLINE signed PY_LONG_LONG __Pyx_PyInt_AsSignedLongLong(PyObject* x) {
+    const signed PY_LONG_LONG neg_one = (signed PY_LONG_LONG)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_MAJOR_VERSION < 3
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to signed PY_LONG_LONG");
+            return (signed PY_LONG_LONG)-1;
+        }
+        return (signed PY_LONG_LONG)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+#if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3
+#if CYTHON_USE_PYLONG_INTERNALS
+            if (sizeof(digit) <= sizeof(signed PY_LONG_LONG)) {
+                switch (Py_SIZE(x)) {
+                    case  0: return 0;
+                    case  1: return (signed PY_LONG_LONG) ((PyLongObject*)x)->ob_digit[0];
+                }
+            }
+#endif
+#endif
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to signed PY_LONG_LONG");
+                return (signed PY_LONG_LONG)-1;
+            }
+            return (signed PY_LONG_LONG)PyLong_AsUnsignedLongLong(x);
+        } else {
+#if CYTHON_COMPILING_IN_CPYTHON && PY_MAJOR_VERSION >= 3
+#if CYTHON_USE_PYLONG_INTERNALS
+            if (sizeof(digit) <= sizeof(signed PY_LONG_LONG)) {
+                switch (Py_SIZE(x)) {
+                    case  0: return 0;
+                    case  1: return +(signed PY_LONG_LONG) ((PyLongObject*)x)->ob_digit[0];
+                    case -1: return -(signed PY_LONG_LONG) ((PyLongObject*)x)->ob_digit[0];
+                }
+            }
+#endif
+#endif
+            return (signed PY_LONG_LONG)PyLong_AsLongLong(x);
+        }
+    } else {
+        signed PY_LONG_LONG val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (signed PY_LONG_LONG)-1;
+        val = __Pyx_PyInt_AsSignedLongLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+static int __Pyx_check_binary_version(void) {
+    char ctversion[4], rtversion[4];
+    PyOS_snprintf(ctversion, 4, "%d.%d", PY_MAJOR_VERSION, PY_MINOR_VERSION);
+    PyOS_snprintf(rtversion, 4, "%s", Py_GetVersion());
+    if (ctversion[0] != rtversion[0] || ctversion[2] != rtversion[2]) {
+        char message[200];
+        PyOS_snprintf(message, sizeof(message),
+                      "compiletime version %s of module '%.100s' "
+                      "does not match runtime version %s",
+                      ctversion, __Pyx_MODULE_NAME, rtversion);
+        #if PY_VERSION_HEX < 0x02050000
+        return PyErr_Warn(NULL, message);
+        #else
+        return PyErr_WarnEx(NULL, message, 1);
+        #endif
+    }
+    return 0;
+}
+
+#ifndef __PYX_HAVE_RT_ImportModule
+#define __PYX_HAVE_RT_ImportModule
+static PyObject *__Pyx_ImportModule(const char *name) {
+    PyObject *py_name = 0;
+    PyObject *py_module = 0;
+    py_name = __Pyx_PyIdentifier_FromString(name);
+    if (!py_name)
+        goto bad;
+    py_module = PyImport_Import(py_name);
+    Py_DECREF(py_name);
+    return py_module;
+bad:
+    Py_XDECREF(py_name);
+    return 0;
+}
+#endif
+
+#ifndef __PYX_HAVE_RT_ImportType
+#define __PYX_HAVE_RT_ImportType
+static PyTypeObject *__Pyx_ImportType(const char *module_name, const char *class_name,
+    size_t size, int strict)
+{
+    PyObject *py_module = 0;
+    PyObject *result = 0;
+    PyObject *py_name = 0;
+    char warning[200];
+    Py_ssize_t basicsize;
+#ifdef Py_LIMITED_API
+    PyObject *py_basicsize;
+#endif
+    py_module = __Pyx_ImportModule(module_name);
+    if (!py_module)
+        goto bad;
+    py_name = __Pyx_PyIdentifier_FromString(class_name);
+    if (!py_name)
+        goto bad;
+    result = PyObject_GetAttr(py_module, py_name);
+    Py_DECREF(py_name);
+    py_name = 0;
+    Py_DECREF(py_module);
+    py_module = 0;
+    if (!result)
+        goto bad;
+    if (!PyType_Check(result)) {
+        PyErr_Format(PyExc_TypeError,
+            "%s.%s is not a type object",
+            module_name, class_name);
+        goto bad;
+    }
+#ifndef Py_LIMITED_API
+    basicsize = ((PyTypeObject *)result)->tp_basicsize;
+#else
+    py_basicsize = PyObject_GetAttrString(result, "__basicsize__");
+    if (!py_basicsize)
+        goto bad;
+    basicsize = PyLong_AsSsize_t(py_basicsize);
+    Py_DECREF(py_basicsize);
+    py_basicsize = 0;
+    if (basicsize == (Py_ssize_t)-1 && PyErr_Occurred())
+        goto bad;
+#endif
+    if (!strict && (size_t)basicsize > size) {
+        PyOS_snprintf(warning, sizeof(warning),
+            "%s.%s size changed, may indicate binary incompatibility",
+            module_name, class_name);
+        #if PY_VERSION_HEX < 0x02050000
+        if (PyErr_Warn(NULL, warning) < 0) goto bad;
+        #else
+        if (PyErr_WarnEx(NULL, warning, 0) < 0) goto bad;
+        #endif
+    }
+    else if ((size_t)basicsize != size) {
+        PyErr_Format(PyExc_ValueError,
+            "%s.%s has the wrong size, try recompiling",
+            module_name, class_name);
+        goto bad;
+    }
+    return (PyTypeObject *)result;
+bad:
+    Py_XDECREF(py_module);
+    Py_XDECREF(result);
+    return NULL;
+}
+#endif
+
+static int __pyx_bisect_code_objects(__Pyx_CodeObjectCacheEntry* entries, int count, int code_line) {
+    int start = 0, mid = 0, end = count - 1;
+    if (end >= 0 && code_line > entries[end].code_line) {
+        return count;
+    }
+    while (start < end) {
+        mid = (start + end) / 2;
+        if (code_line < entries[mid].code_line) {
+            end = mid;
+        } else if (code_line > entries[mid].code_line) {
+             start = mid + 1;
+        } else {
+            return mid;
+        }
+    }
+    if (code_line <= entries[mid].code_line) {
+        return mid;
+    } else {
+        return mid + 1;
+    }
+}
+static PyCodeObject *__pyx_find_code_object(int code_line) {
+    PyCodeObject* code_object;
+    int pos;
+    if (unlikely(!code_line) || unlikely(!__pyx_code_cache.entries)) {
+        return NULL;
+    }
+    pos = __pyx_bisect_code_objects(__pyx_code_cache.entries, __pyx_code_cache.count, code_line);
+    if (unlikely(pos >= __pyx_code_cache.count) || unlikely(__pyx_code_cache.entries[pos].code_line != code_line)) {
+        return NULL;
+    }
+    code_object = __pyx_code_cache.entries[pos].code_object;
+    Py_INCREF(code_object);
+    return code_object;
+}
+static void __pyx_insert_code_object(int code_line, PyCodeObject* code_object) {
+    int pos, i;
+    __Pyx_CodeObjectCacheEntry* entries = __pyx_code_cache.entries;
+    if (unlikely(!code_line)) {
+        return;
+    }
+    if (unlikely(!entries)) {
+        entries = (__Pyx_CodeObjectCacheEntry*)PyMem_Malloc(64*sizeof(__Pyx_CodeObjectCacheEntry));
+        if (likely(entries)) {
+            __pyx_code_cache.entries = entries;
+            __pyx_code_cache.max_count = 64;
+            __pyx_code_cache.count = 1;
+            entries[0].code_line = code_line;
+            entries[0].code_object = code_object;
+            Py_INCREF(code_object);
+        }
+        return;
+    }
+    pos = __pyx_bisect_code_objects(__pyx_code_cache.entries, __pyx_code_cache.count, code_line);
+    if ((pos < __pyx_code_cache.count) && unlikely(__pyx_code_cache.entries[pos].code_line == code_line)) {
+        PyCodeObject* tmp = entries[pos].code_object;
+        entries[pos].code_object = code_object;
+        Py_DECREF(tmp);
+        return;
+    }
+    if (__pyx_code_cache.count == __pyx_code_cache.max_count) {
+        int new_max = __pyx_code_cache.max_count + 64;
+        entries = (__Pyx_CodeObjectCacheEntry*)PyMem_Realloc(
+            __pyx_code_cache.entries, new_max*sizeof(__Pyx_CodeObjectCacheEntry));
+        if (unlikely(!entries)) {
+            return;
+        }
+        __pyx_code_cache.entries = entries;
+        __pyx_code_cache.max_count = new_max;
+    }
+    for (i=__pyx_code_cache.count; i>pos; i--) {
+        entries[i] = entries[i-1];
+    }
+    entries[pos].code_line = code_line;
+    entries[pos].code_object = code_object;
+    __pyx_code_cache.count++;
+    Py_INCREF(code_object);
+}
+
+#include "compile.h"
+#include "frameobject.h"
+#include "traceback.h"
+static PyCodeObject* __Pyx_CreateCodeObjectForTraceback(
+            const char *funcname, int c_line,
+            int py_line, const char *filename) {
+    PyCodeObject *py_code = 0;
+    PyObject *py_srcfile = 0;
+    PyObject *py_funcname = 0;
+    #if PY_MAJOR_VERSION < 3
+    py_srcfile = PyString_FromString(filename);
+    #else
+    py_srcfile = PyUnicode_FromString(filename);
+    #endif
+    if (!py_srcfile) goto bad;
+    if (c_line) {
+        #if PY_MAJOR_VERSION < 3
+        py_funcname = PyString_FromFormat( "%s (%s:%d)", funcname, __pyx_cfilenm, c_line);
+        #else
+        py_funcname = PyUnicode_FromFormat( "%s (%s:%d)", funcname, __pyx_cfilenm, c_line);
+        #endif
+    }
+    else {
+        #if PY_MAJOR_VERSION < 3
+        py_funcname = PyString_FromString(funcname);
+        #else
+        py_funcname = PyUnicode_FromString(funcname);
+        #endif
+    }
+    if (!py_funcname) goto bad;
+    py_code = __Pyx_PyCode_New(
+        0,            /*int argcount,*/
+        0,            /*int kwonlyargcount,*/
+        0,            /*int nlocals,*/
+        0,            /*int stacksize,*/
+        0,            /*int flags,*/
+        __pyx_empty_bytes, /*PyObject *code,*/
+        __pyx_empty_tuple, /*PyObject *consts,*/
+        __pyx_empty_tuple, /*PyObject *names,*/
+        __pyx_empty_tuple, /*PyObject *varnames,*/
+        __pyx_empty_tuple, /*PyObject *freevars,*/
+        __pyx_empty_tuple, /*PyObject *cellvars,*/
+        py_srcfile,   /*PyObject *filename,*/
+        py_funcname,  /*PyObject *name,*/
+        py_line,      /*int firstlineno,*/
+        __pyx_empty_bytes  /*PyObject *lnotab*/
+    );
+    Py_DECREF(py_srcfile);
+    Py_DECREF(py_funcname);
+    return py_code;
+bad:
+    Py_XDECREF(py_srcfile);
+    Py_XDECREF(py_funcname);
+    return NULL;
+}
+static void __Pyx_AddTraceback(const char *funcname, int c_line,
+                               int py_line, const char *filename) {
+    PyCodeObject *py_code = 0;
+    PyObject *py_globals = 0;
+    PyFrameObject *py_frame = 0;
+    py_code = __pyx_find_code_object(c_line ? c_line : py_line);
+    if (!py_code) {
+        py_code = __Pyx_CreateCodeObjectForTraceback(
+            funcname, c_line, py_line, filename);
+        if (!py_code) goto bad;
+        __pyx_insert_code_object(c_line ? c_line : py_line, py_code);
+    }
+    py_globals = PyModule_GetDict(__pyx_m);
+    if (!py_globals) goto bad;
+    py_frame = PyFrame_New(
+        PyThreadState_GET(), /*PyThreadState *tstate,*/
+        py_code,             /*PyCodeObject *code,*/
+        py_globals,          /*PyObject *globals,*/
+        0                    /*PyObject *locals*/
+    );
+    if (!py_frame) goto bad;
+    py_frame->f_lineno = py_line;
+    PyTraceBack_Here(py_frame);
+bad:
+    Py_XDECREF(py_code);
+    Py_XDECREF(py_frame);
+}
+
+static int __Pyx_InitStrings(__Pyx_StringTabEntry *t) {
+    while (t->p) {
+        #if PY_MAJOR_VERSION < 3
+        if (t->is_unicode) {
+            *t->p = PyUnicode_DecodeUTF8(t->s, t->n - 1, NULL);
+        } else if (t->intern) {
+            *t->p = PyString_InternFromString(t->s);
+        } else {
+            *t->p = PyString_FromStringAndSize(t->s, t->n - 1);
+        }
+        #else  /* Python 3+ has unicode identifiers */
+        if (t->is_unicode | t->is_str) {
+            if (t->intern) {
+                *t->p = PyUnicode_InternFromString(t->s);
+            } else if (t->encoding) {
+                *t->p = PyUnicode_Decode(t->s, t->n - 1, t->encoding, NULL);
+            } else {
+                *t->p = PyUnicode_FromStringAndSize(t->s, t->n - 1);
+            }
+        } else {
+            *t->p = PyBytes_FromStringAndSize(t->s, t->n - 1);
+        }
+        #endif
+        if (!*t->p)
+            return -1;
+        ++t;
+    }
+    return 0;
+}
+
+static CYTHON_INLINE PyObject* __Pyx_PyUnicode_FromString(char* c_str) {
+    return __Pyx_PyUnicode_FromStringAndSize(c_str, strlen(c_str));
+}
+static CYTHON_INLINE char* __Pyx_PyObject_AsString(PyObject* o) {
+    Py_ssize_t ignore;
+    return __Pyx_PyObject_AsStringAndSize(o, &ignore);
+}
+static CYTHON_INLINE char* __Pyx_PyObject_AsStringAndSize(PyObject* o, Py_ssize_t *length) {
+#if __PYX_DEFAULT_STRING_ENCODING_IS_ASCII || __PYX_DEFAULT_STRING_ENCODING_IS_DEFAULT
+    if (
+#if PY_MAJOR_VERSION < 3 && __PYX_DEFAULT_STRING_ENCODING_IS_ASCII
+            __Pyx_sys_getdefaultencoding_not_ascii &&
+#endif
+            PyUnicode_Check(o)) {
+#if PY_VERSION_HEX < 0x03030000
+        char* defenc_c;
+        PyObject* defenc = _PyUnicode_AsDefaultEncodedString(o, NULL);
+        if (!defenc) return NULL;
+        defenc_c = PyBytes_AS_STRING(defenc);
+#if __PYX_DEFAULT_STRING_ENCODING_IS_ASCII
+        {
+            char* end = defenc_c + PyBytes_GET_SIZE(defenc);
+            char* c;
+            for (c = defenc_c; c < end; c++) {
+                if ((unsigned char) (*c) >= 128) {
+                    PyUnicode_AsASCIIString(o);
+                    return NULL;
+                }
+            }
+        }
+#endif /*__PYX_DEFAULT_STRING_ENCODING_IS_ASCII*/
+        *length = PyBytes_GET_SIZE(defenc);
+        return defenc_c;
+#else /* PY_VERSION_HEX < 0x03030000 */
+        if (PyUnicode_READY(o) == -1) return NULL;
+#if __PYX_DEFAULT_STRING_ENCODING_IS_ASCII
+        if (PyUnicode_IS_ASCII(o)) {
+            *length = PyUnicode_GET_DATA_SIZE(o);
+            return PyUnicode_AsUTF8(o);
+        } else {
+            PyUnicode_AsASCIIString(o);
+            return NULL;
+        }
+#else /* __PYX_DEFAULT_STRING_ENCODING_IS_ASCII */
+        return PyUnicode_AsUTF8AndSize(o, length);
+#endif /* __PYX_DEFAULT_STRING_ENCODING_IS_ASCII */
+#endif /* PY_VERSION_HEX < 0x03030000 */
+    } else
+#endif /* __PYX_DEFAULT_STRING_ENCODING_IS_ASCII  || __PYX_DEFAULT_STRING_ENCODING_IS_DEFAULT */
+    {
+        char* result;
+        int r = PyBytes_AsStringAndSize(o, &result, length);
+        if (r < 0) {
+            return NULL;
+        } else {
+            return result;
+        }
+    }
+}
+static CYTHON_INLINE int __Pyx_PyObject_IsTrue(PyObject* x) {
+   int is_true = x == Py_True;
+   if (is_true | (x == Py_False) | (x == Py_None)) return is_true;
+   else return PyObject_IsTrue(x);
+}
+static CYTHON_INLINE PyObject* __Pyx_PyNumber_Int(PyObject* x) {
+  PyNumberMethods *m;
+  const char *name = NULL;
+  PyObject *res = NULL;
+#if PY_MAJOR_VERSION < 3
+  if (PyInt_Check(x) || PyLong_Check(x))
+#else
+  if (PyLong_Check(x))
+#endif
+    return Py_INCREF(x), x;
+  m = Py_TYPE(x)->tp_as_number;
+#if PY_MAJOR_VERSION < 3
+  if (m && m->nb_int) {
+    name = "int";
+    res = PyNumber_Int(x);
+  }
+  else if (m && m->nb_long) {
+    name = "long";
+    res = PyNumber_Long(x);
+  }
+#else
+  if (m && m->nb_int) {
+    name = "int";
+    res = PyNumber_Long(x);
+  }
+#endif
+  if (res) {
+#if PY_MAJOR_VERSION < 3
+    if (!PyInt_Check(res) && !PyLong_Check(res)) {
+#else
+    if (!PyLong_Check(res)) {
+#endif
+      PyErr_Format(PyExc_TypeError,
+                   "__%s__ returned non-%s (type %.200s)",
+                   name, name, Py_TYPE(res)->tp_name);
+      Py_DECREF(res);
+      return NULL;
+    }
+  }
+  else if (!PyErr_Occurred()) {
+    PyErr_SetString(PyExc_TypeError,
+                    "an integer is required");
+  }
+  return res;
+}
+static CYTHON_INLINE Py_ssize_t __Pyx_PyIndex_AsSsize_t(PyObject* b) {
+  Py_ssize_t ival;
+  PyObject* x = PyNumber_Index(b);
+  if (!x) return -1;
+  ival = PyInt_AsSsize_t(x);
+  Py_DECREF(x);
+  return ival;
+}
+static CYTHON_INLINE PyObject * __Pyx_PyInt_FromSize_t(size_t ival) {
+#if PY_VERSION_HEX < 0x02050000
+   if (ival <= LONG_MAX)
+       return PyInt_FromLong((long)ival);
+   else {
+       unsigned char *bytes = (unsigned char *) &ival;
+       int one = 1; int little = (int)*(unsigned char*)&one;
+       return _PyLong_FromByteArray(bytes, sizeof(size_t), little, 0);
+   }
+#else
+   return PyInt_FromSize_t(ival);
+#endif
+}
+static CYTHON_INLINE size_t __Pyx_PyInt_AsSize_t(PyObject* x) {
+   unsigned PY_LONG_LONG val = __Pyx_PyInt_AsUnsignedLongLong(x);
+   if (unlikely(val != (unsigned PY_LONG_LONG)(size_t)val)) {
+       if ((val != (unsigned PY_LONG_LONG)-1) || !PyErr_Occurred())
+           PyErr_SetString(PyExc_OverflowError,
+                           "value too large to convert to size_t");
+       return (size_t)-1;
+   }
+   return (size_t)val;
+}
+
+
+#endif /* Py_PYTHON_H */
diff --git a/src/s3ql/deltadump.py b/src/s3ql/deltadump.py
deleted file mode 100644
index 3a943c8..0000000
--- a/src/s3ql/deltadump.py
+++ /dev/null
@@ -1,66 +0,0 @@
-'''
-deltadump.py - this file is part of S3QL (http://s3ql.googlecode.com)
-
-Copyright (C) Nikolaus Rath <Nikolaus@rath.org>
-
-This program can be distributed under the terms of the GNU GPLv3.
-'''
-
-# This is a wrapper for _deltadump to work around
-# http://trac.cython.org/cython_trac/ticket/475
-
-#@PydevCodeAnalysisIgnore
-
-from __future__ import division, print_function, absolute_import
-
-import apsw
-from . import _deltadump
-from ._deltadump import *
-import subprocess
-import re
-
-def get_libraries(pathname):
-    '''Return shared libraries required for *pathname*'''
-
-    libs = dict()
-    ldd = subprocess.Popen(['ldd', pathname], stdout=subprocess.PIPE)
-    for line in ldd.stdout:
-        if '=>' in line:
-            (soname, path) = line.split('=>')
-        else:
-            path = line.strip()
-            soname = None
-
-        hit = re.match(r'^\s*(.+)\s+\(0x[0-9a-fA-F]+\)$', path)
-        if hit:
-            path = hit.group(1).strip()
-        else:
-            path = path.strip()
-
-        if path == 'not found':
-            path = None
-
-        if not soname:
-            soname = path
-
-        libs[soname.strip()] = path
-
-    if ldd.wait() != 0:
-        raise ImportError('ldd call failed')
-
-    return libs
-
-
-# We need to make sure that apsw and _deltadump are linked against the same
-# sqlite library.
-apsw_libs = get_libraries(apsw.__file__)
-s3ql_libs = get_libraries(_deltadump.__file__)
-
-if 'libsqlite3.so.0' not in apsw_libs:
-    raise ImportError("python-apsw must be linked dynamically to sqlite3")
-
-if 'libsqlite3.so.0' not in s3ql_libs:
-    raise ImportError('s3ql._deltadump must be linked dynamically to sqlite3')
-
-if apsw_libs['libsqlite3.so.0'] != s3ql_libs['libsqlite3.so.0']:
-    raise ImportError('python-apsw and s3ql._deltadump not linked against same sqlite3 library')
diff --git a/src/s3ql/deltadump.pyx b/src/s3ql/deltadump.pyx
new file mode 100644
index 0000000..8d6148a
--- /dev/null
+++ b/src/s3ql/deltadump.pyx
@@ -0,0 +1,614 @@
+'''
+_deltadump.pyx - this file is part of S3QL (http://s3ql.googlecode.com)
+
+Copyright (C) Nikolaus Rath <Nikolaus@rath.org>
+
+This program can be distributed under the terms of the GNU GPLv3.
+'''
+
+# Analysis of Cython code not really working yet
+#@PydevCodeAnalysisIgnore
+
+from __future__ import print_function, division
+
+from cpython.long cimport PyLong_AsVoidPtr
+from cpython cimport PyString_FromString
+from cpython.exc cimport PyErr_NoMemory
+from libc.stdio cimport (FILE, const_char, const_void, fclose as fclose_c,
+                         fwrite as fwrite_c, fread as fread_c, ftell)
+from libc.string cimport strerror
+from libc.errno cimport errno
+from libc.stdlib cimport calloc as calloc_c, free as free_c
+from libc.stdint cimport (int64_t, uint8_t, uint16_t, uint32_t, uint64_t)
+from posix.unistd cimport dup, lseek, SEEK_SET
+
+cdef extern from 'stdint.h' nogil:
+    enum: UINT8_MAX
+    enum: UINT16_MAX
+    enum: UINT32_MAX
+
+cdef extern from 'stdio.h' nogil:
+    FILE * fdopen(int fd, const_char * mode)
+    int fflush(FILE * stream)
+    int fileno(FILE * stream)
+
+cdef extern from 'endian.h' nogil:
+    uint64_t htole64(uint64_t host_64bits)
+    uint64_t le64toh(uint64_t little_endian_64bits)
+
+cdef extern from 'sqlite3.h' nogil:
+    ctypedef int sqlite3
+    ctypedef int sqlite3_stmt
+    ctypedef int64_t sqlite3_int64
+
+    const_char *sqlite3_errmsg(sqlite3*)
+    int sqlite3_prepare_v2(sqlite3 * db,
+                           char * zSql,
+                           int nByte,
+                           sqlite3_stmt ** ppStmt,
+                           char ** pzTail)
+    int sqlite3_step(sqlite3_stmt *)
+    sqlite3_int64 sqlite3_column_int64(sqlite3_stmt * , int iCol)
+    const_void * sqlite3_column_blob(sqlite3_stmt * , int iCol)
+    int sqlite3_column_bytes(sqlite3_stmt * , int iCol)
+    int sqlite3_bind_blob(sqlite3_stmt * , int iCol, const_void * , int n, void(*)(void *))
+    int sqlite3_bind_int64(sqlite3_stmt * , int iCol, sqlite3_int64)
+    int sqlite3_reset(sqlite3_stmt * pStmt)
+    int sqlite3_finalize(sqlite3_stmt * pStmt)
+    int sqlite3_column_type(sqlite3_stmt * , int iCol)
+    double sqlite3_column_double(sqlite3_stmt * , int iCol)
+    int sqlite3_bind_double(sqlite3_stmt * , int, double)
+    const_char *sqlite3_compileoption_get(int N)
+    const_char *sqlite3_libversion()
+    int sqlite3_close(sqlite3*)
+    int sqlite3_open_v2(const_char *filename, sqlite3 **ppDb,
+                        int flags, const_char *zVfs)
+    int sqlite3_extended_result_codes(sqlite3*, int onoff)
+    void SQLITE_TRANSIENT(void *)
+
+    enum:
+        SQLITE_OK
+        SQLITE_DONE
+        SQLITE_ROW
+        SQLITE_NULL
+        SQLITE_OPEN_READWRITE
+        SQLITE_OPEN_READONLY
+
+from .cleanup_manager import CleanupManager
+import apsw
+import os
+import logging
+import itertools
+
+log = logging.getLogger('deltadump')
+
+def check_sqlite():
+    '''Check if deltadump and apsw module use compatible SQLite code.
+
+    This functions look at versions and compile options of the SQLite
+    code used by the *apsw* module and the *deltadump* module. If they
+    do not match exactly, a `RuntimeError` is raised.
+
+    Only if both modules use the same SQLite version compiled with the
+    same options can the database object be shared between *apsw* and
+    *deltadump*.
+    '''
+    
+    cdef const_char *buf
+
+    apsw_sqlite_version = apsw.sqlitelibversion()
+    s3ql_sqlite_version = PyString_FromString(sqlite3_libversion())
+    log.debug('apsw sqlite version: %s, '
+              's3ql sqlite version: %s',
+              apsw_sqlite_version,
+              s3ql_sqlite_version)
+    if apsw_sqlite_version != s3ql_sqlite_version:
+        raise RuntimeError('SQLite version mismatch between APSW and S3QL '
+                           '(%s vs %s)' % (apsw_sqlite_version, s3ql_sqlite_version))
+    
+    apsw_sqlite_options = set(apsw.compile_options)
+    s3ql_sqlite_options = set()
+    for idx in itertools.count(0):
+        buf = sqlite3_compileoption_get(idx)
+        if buf is NULL:
+            break
+        s3ql_sqlite_options.add(PyString_FromString(buf))
+
+    log.debug('apsw sqlite compile options: %s, '
+              's3ql sqlite compile options: %s',
+              apsw_sqlite_options,
+              s3ql_sqlite_options)
+    if apsw_sqlite_options != s3ql_sqlite_options:
+        raise RuntimeError('SQLite code used by APSW was compiled with different '
+                           'options than SQLite code available to S3QL! '
+                           'Differing settings: + %s, - %s' %
+                           (apsw_sqlite_options - s3ql_sqlite_options,
+                           s3ql_sqlite_options - apsw_sqlite_options))
+
+# Column types
+cdef int _INTEGER = 1
+cdef int _BLOB = 2
+cdef int _TIME = 3
+
+# Make column types available as Python objects
+INTEGER = _INTEGER
+BLOB = _BLOB
+TIME = _TIME
+
+# Integer length codes
+cdef uint8_t INT8 = 127
+cdef uint8_t INT16 = 126
+cdef uint8_t INT32 = 125
+cdef uint8_t INT64 = 124
+
+# Maximum size of BLOBs
+MAX_BLOB_SIZE = 4096
+
+# Scale factor from time floats to integers
+# 1e9 would be perfect, but introduces rounding errors
+cdef double time_scale = 1 << 30
+
+cdef inline int fwrite(const_void * buf, size_t len_, FILE * fp) except -1:
+    '''Call libc's fwrite() and raise exception on failure'''
+
+    if fwrite_c(buf, len_, 1, fp) != 1:
+        raise IOError(errno, strerror(errno))
+    return len_
+
+cdef inline int fread(void * buf, size_t len_, FILE * fp) except -1:
+    '''Call libc's fread() and raise exception on failure'''
+
+    if fread_c(buf, len_, 1, fp) != 1:
+        raise IOError(errno, strerror(errno))
+    return len_
+
+cdef free(void * ptr):
+    '''Call libc.free()
+
+    This is a Python wrapper, so that we can call free in e.g.
+    a lambda expression.
+    '''
+
+    free_c(ptr)
+    return None
+
+cdef int fclose(FILE * fp) except -1:
+    '''Call libc.fclose() and raise exception on failure'''
+
+    cdef ssize_t off
+
+    # Explicitly flush data that needs to be written. This is
+    # important, so that we can safely reposition the fd position
+    # below (which is necessary in case there is cached input data)
+    if fflush(fp) != 0:
+        raise OSError(errno, strerror(errno))
+    
+    # Reposition FD to position of FILE*, otherwise next read from FD will miss
+    # data currently in stream buffer. It seems that call to fflush() achieves
+    # the same thing, but this does not seem to be documented so we don't rely
+    # on it.
+    off = ftell(fp)
+    if off == -1:
+        raise OSError(errno, strerror(errno))
+
+    if lseek(fileno(fp), off, SEEK_SET) != off:
+        raise OSError(errno, strerror(errno))
+
+    if fclose_c(fp) != 0:
+        raise OSError(errno, strerror(errno))
+
+    return 0
+
+cdef void * calloc(size_t cnt, size_t size) except NULL:
+    '''Call libc.calloc and raise exception on failure'''
+
+    cdef void * ptr
+
+    ptr = calloc_c(cnt, size)
+
+    if ptr is NULL:
+        PyErr_NoMemory()
+
+    return ptr
+
+
+cdef int SQLITE_CHECK_RC(int rc, int success, sqlite3* db) except -1:
+    '''Raise correct exception if *rc* != *success*'''
+    
+    if rc != success:
+        exc = apsw.exceptionfor(rc)
+        raise type(exc)(sqlite3_errmsg(db))
+
+    return 0
+
+
+cdef int prep_columns(columns, int** col_types_p, int** col_args_p) except -1:
+    '''Allocate col_types and col_args, return number of columns
+
+    Both arrays are allocated dynamically, caller has to ensure
+    that they're freed again.
+    '''
+    cdef int col_count, *col_types, *col_args
+    
+    col_count = len(columns)
+    col_types = < int *> calloc(col_count, sizeof(int))
+    col_args = < int *> calloc(col_count, sizeof(int))
+
+    # Initialize col_args and col_types   
+    for i in range(col_count):
+        if columns[i][1] not in (BLOB, INTEGER, TIME):
+            raise ValueError("Invalid type for column %d" % i)
+        col_types[i] = columns[i][1]
+
+        if len(columns[i]) == 3:
+            col_args[i] = columns[i][2]
+        else:
+            col_args[i] = 0
+
+    col_types_p[0] = col_types
+    col_args_p[0] = col_args
+    return col_count
+
+cdef FILE* dup_to_fp(fh, mode) except NULL:
+    '''Duplicate fd from *fh* and open as FILE*'''
+
+    cdef int fd
+
+    fd = dup(fh.fileno())
+    if fd == -1:
+        raise OSError(errno, strerror(errno))
+    fp = fdopen(fd, mode)
+    if fp == NULL:
+        raise OSError(errno, strerror(errno))
+
+    return fp
+
+
+def dump_table(table, order, columns, db, fh):
+    '''Dump *columns* of *table* into *fh*
+
+    *order* specifies the order in which the rows are written and must be a
+    string that can be inserted after the "ORDER BY" clause in an SQL SELECT
+    statement.
+    
+    *db* is an `s3ql.Connection` instance for the database.
+    
+    *columns* must a list of 3-tuples, one for each column that should be
+    stored. The first element of the tuple must contain the column name and the
+    second element the type of data stored in the column (`INTEGER`, `TIME`
+    or `BLOB`). Times will be converted to nanosecond integers.
+    
+    For integers and seconds, the third tuple element specifies the expected
+    change of the values between rows. For blobs it can be either zero
+    (indicating variable length columns) or an integer specifying the length of
+    the column values in bytes.
+
+    This function will open a separate connection to the database, so
+    the *db* connection should not be in EXCLUSIVE locking mode.
+    (Using a separate connection avoids the requirement on the *apsw*
+    and *deltadump* modules be linked against against binary
+    compatible SQLite libraries).
+    '''
+
+    cdef sqlite3 *sqlite3_db
+    cdef sqlite3_stmt *stmt
+    cdef int *col_types, *col_args, col_count, rc, i, len_
+    cdef int64_t *int64_prev, int64, tmp
+    cdef FILE *fp
+    cdef const_void *buf
+    cdef int64_t row_count
+
+    if db.file == ':memory:':
+        raise ValueError("Can't access in-memory databases")
+
+    with CleanupManager(log) as cleanup:
+        # Get SQLite connection
+        log.debug('Opening connection to %s', db.file)
+        SQLITE_CHECK_RC(sqlite3_open_v2(db.file, &sqlite3_db,
+                                        SQLITE_OPEN_READONLY, NULL),
+                        SQLITE_OK, sqlite3_db)
+        cleanup.register(lambda: SQLITE_CHECK_RC(sqlite3_close(sqlite3_db),
+                                                 SQLITE_OK, sqlite3_db))
+        SQLITE_CHECK_RC(sqlite3_extended_result_codes(sqlite3_db, 1),
+                        SQLITE_OK, sqlite3_db)
+
+        # Get FILE* for buffered reading from *fh*
+        fp = dup_to_fp(fh, 'wb')
+        cleanup.register(lambda: fclose(fp))
+
+        # Allocate col_args and col_types 
+        col_count = prep_columns(columns, &col_types, &col_args)
+        cleanup.register(lambda: free(col_args))
+        cleanup.register(lambda: free(col_types))
+        
+        # Allocate int64_prev
+        int64_prev = < int64_t *> calloc(len(columns), sizeof(int64_t))
+        cleanup.register(lambda: free(int64_prev))
+
+        # Prepare statement
+        col_names = [ x[0] for x in columns ]
+        query = ("SELECT %s FROM %s ORDER BY %s " %
+                 (', '.join(col_names), table, order))
+        SQLITE_CHECK_RC(sqlite3_prepare_v2(sqlite3_db, query, -1, &stmt, NULL),
+                        SQLITE_OK, sqlite3_db)
+        cleanup.register(lambda: SQLITE_CHECK_RC(sqlite3_finalize(stmt),
+                                                 SQLITE_OK, sqlite3_db))
+
+        # Dump or load data as requested
+        row_count = db.get_val("SELECT COUNT(rowid) FROM %s" % table)
+        log.debug('dump_table(%s): writing %d rows', table, row_count)
+        write_integer(row_count, fp)
+
+        # Iterate through rows
+        while True:
+            rc = sqlite3_step(stmt)
+            if rc == SQLITE_DONE:
+                break
+            SQLITE_CHECK_RC(rc, SQLITE_ROW, sqlite3_db)
+
+            for i in range(col_count):
+                if sqlite3_column_type(stmt, i) is SQLITE_NULL:
+                    raise ValueError("Can't dump NULL values")
+
+                if col_types[i] == _INTEGER:
+                    int64 = sqlite3_column_int64(stmt, i)
+                    tmp = int64
+                    int64 -= int64_prev[i] + col_args[i]
+                    int64_prev[i] = tmp
+                    write_integer(int64, fp)
+
+                elif col_types[i] == _TIME:
+                    int64 = < int64_t > (sqlite3_column_double(stmt, i) * time_scale)
+                    tmp = int64
+                    int64 -= int64_prev[i] + col_args[i]
+                    int64_prev[i] = tmp
+                    write_integer(int64, fp)
+
+                elif col_types[i] == _BLOB:
+                    buf = sqlite3_column_blob(stmt, i)
+                    len_ = sqlite3_column_bytes(stmt, i)
+                    if len_ > MAX_BLOB_SIZE:
+                            raise ValueError('Can not dump BLOB of size %d (max: %d)',
+                                             len_, MAX_BLOB_SIZE)
+                    if col_args[i] == 0:
+                        write_integer(len_ - int64_prev[i], fp)
+                        int64_prev[i] = len_
+                    elif len_ != col_args[i]:
+                        raise ValueError("Length %d != %d in column %d" % (len_, col_args[i], i))
+
+                    if len_ != 0:
+                        fwrite(buf, len_, fp)
+
+def load_table(table, columns, db, fh, trx_rows=5000):
+    '''Load *columns* of *table* from *fh*
+
+    *db* is an `s3ql.Connection` instance for the database.
+    
+    *columns* must be the same list of 3-tuples that was passed to
+    `dump_table` when creating the dump stored in *fh*.
+
+    This function will open a separate connection to the database, so
+    the *db* connection should not be in EXCLUSIVE locking mode.
+    (Using a separate connection avoids the requirement on the *apsw*
+    and *deltadump* modules be linked against against binary
+    compatible SQLite libraries).
+
+    When writing into the table, a new transaction will be started
+    every *trx_rows* rows.
+    '''
+
+    cdef sqlite3 *sqlite3_db
+    cdef sqlite3_stmt *stmt, *begin_stmt, *commit_stmt
+    cdef int *col_types, *col_args, col_count, rc, len_, i, j
+    cdef int64_t *int64_prev
+    cdef FILE *fp
+    cdef void *buf
+    cdef int64_t row_count, int64
+
+    if db.file == ':memory:':
+        raise ValueError("Can't access in-memory databases")
+
+    with CleanupManager(log) as cleanup:
+        # Get SQLite connection
+        log.debug('Opening connection to %s', db.file)
+        SQLITE_CHECK_RC(sqlite3_open_v2(db.file, &sqlite3_db,
+                                        SQLITE_OPEN_READWRITE, NULL),
+                        SQLITE_OK, sqlite3_db)
+        cleanup.register(lambda: SQLITE_CHECK_RC(sqlite3_close(sqlite3_db),
+                                                 SQLITE_OK, sqlite3_db))
+        SQLITE_CHECK_RC(sqlite3_extended_result_codes(sqlite3_db, 1),
+                        SQLITE_OK, sqlite3_db)
+
+        # Copy settings
+        for pragma in ('synchronous', 'foreign_keys'):
+            val = db.get_val('PRAGMA %s' % pragma)
+            cmd = 'PRAGMA %s = %s' % (pragma, val)
+            SQLITE_CHECK_RC(sqlite3_prepare_v2(sqlite3_db, cmd, -1, &stmt, NULL),
+                            SQLITE_OK, sqlite3_db)
+            try:
+                rc = sqlite3_step(stmt)
+                if rc == SQLITE_ROW:
+                    rc = sqlite3_step(stmt)
+                SQLITE_CHECK_RC(rc, SQLITE_DONE, sqlite3_db)
+            finally:
+                SQLITE_CHECK_RC(sqlite3_finalize(stmt), SQLITE_OK, sqlite3_db)
+
+        # Get FILE* for buffered reading from *fh*
+        fp = dup_to_fp(fh, 'rb')
+        cleanup.register(lambda: fclose(fp))
+
+        # Allocate col_args and col_types 
+        col_count = prep_columns(columns, &col_types, &col_args)
+        cleanup.register(lambda: free(col_args))
+        cleanup.register(lambda: free(col_types))
+
+        # Allocate int64_prev
+        int64_prev = < int64_t *> calloc(len(columns), sizeof(int64_t))
+        cleanup.register(lambda: free(int64_prev))
+
+        # Prepare INSERT statement
+        col_names = [ x[0] for x in columns ]
+        query = ("INSERT INTO %s (%s) VALUES(%s)"
+                 % (table, ', '.join(col_names), ', '.join('?' * col_count)))
+        SQLITE_CHECK_RC(sqlite3_prepare_v2(sqlite3_db, query, -1, &stmt, NULL),
+                        SQLITE_OK, sqlite3_db)
+        cleanup.register(lambda: SQLITE_CHECK_RC(sqlite3_finalize(stmt),
+                                                 SQLITE_OK, sqlite3_db))
+
+        # Prepare BEGIN statement
+        query = 'BEGIN TRANSACTION'
+        SQLITE_CHECK_RC(sqlite3_prepare_v2(sqlite3_db, query, -1, &begin_stmt, NULL),
+                        SQLITE_OK, sqlite3_db)
+        cleanup.register(lambda: SQLITE_CHECK_RC(sqlite3_finalize(begin_stmt),
+                                                 SQLITE_OK, sqlite3_db))
+
+        # Prepare COMMIT statement
+        query = 'COMMIT TRANSACTION'
+        SQLITE_CHECK_RC(sqlite3_prepare_v2(sqlite3_db, query, -1, &commit_stmt, NULL),
+                        SQLITE_OK, sqlite3_db)
+        cleanup.register(lambda: SQLITE_CHECK_RC(sqlite3_finalize(commit_stmt),
+                                                 SQLITE_OK, sqlite3_db))
+
+        # Dump or load data as requested
+        buf = calloc(MAX_BLOB_SIZE, 1)
+        cleanup.register(lambda: free(buf))
+        read_integer(&row_count, fp)
+        log.debug('load_table(%s): reading %d rows', table, row_count)
+
+        # Start transaction
+        SQLITE_CHECK_RC(sqlite3_step(begin_stmt), SQLITE_DONE, sqlite3_db)
+        cleanup.register(lambda: SQLITE_CHECK_RC(sqlite3_step(commit_stmt),
+                                                 SQLITE_DONE, sqlite3_db))
+        SQLITE_CHECK_RC(sqlite3_reset(begin_stmt), SQLITE_OK, sqlite3_db)
+
+        # Iterate through rows
+        for i in range(row_count):
+            for j in range(col_count):
+                if col_types[j] == _INTEGER:
+                    read_integer(&int64, fp)
+                    int64 += col_args[j] + int64_prev[j]
+                    int64_prev[j] = int64
+                    SQLITE_CHECK_RC(sqlite3_bind_int64(stmt, j + 1, int64),
+                                    SQLITE_OK, sqlite3_db)
+
+                if col_types[j] == _TIME:
+                    read_integer(&int64, fp)
+                    int64 += col_args[j] + int64_prev[j]
+                    int64_prev[j] = int64
+                    SQLITE_CHECK_RC(sqlite3_bind_double(stmt, j + 1, int64 / time_scale),
+                                    SQLITE_OK, sqlite3_db)
+
+                elif col_types[j] == _BLOB:
+                    if col_args[j] == 0:
+                        read_integer(&int64, fp)
+                        len_ = int64_prev[j] + int64
+                        int64_prev[j] = len_
+                    else:
+                        len_ = col_args[j]
+
+                    if len_ > MAX_BLOB_SIZE:
+                        raise RuntimeError('BLOB too large to read (%d vs %d)', len_, MAX_BLOB_SIZE)
+
+                    if len_ != 0:
+                        fread(buf, len_, fp)
+                        
+                    SQLITE_CHECK_RC(sqlite3_bind_blob(stmt, j + 1, buf, len_, SQLITE_TRANSIENT),
+                                    SQLITE_OK, sqlite3_db)
+                
+            SQLITE_CHECK_RC(sqlite3_step(stmt), SQLITE_DONE, sqlite3_db)
+            SQLITE_CHECK_RC(sqlite3_reset(stmt), SQLITE_OK, sqlite3_db)
+
+            # Commit every once in a while
+            if i % trx_rows == 0:
+                # This isn't 100% ok -- if we have an exception in step(begin_stmt),
+                # we the cleanup handler will execute the commit statement again
+                # without an active transaction.
+                SQLITE_CHECK_RC(sqlite3_step(commit_stmt), SQLITE_DONE, sqlite3_db)
+                SQLITE_CHECK_RC(sqlite3_step(begin_stmt), SQLITE_DONE, sqlite3_db)
+                SQLITE_CHECK_RC(sqlite3_reset(commit_stmt), SQLITE_OK, sqlite3_db)
+                SQLITE_CHECK_RC(sqlite3_reset(begin_stmt), SQLITE_OK, sqlite3_db)
+                
+
+cdef inline int write_integer(int64_t int64, FILE * fp) except -1:
+    '''Write *int64* into *fp*, using as little space as possible
+
+    Return the number of bytes written, or -1 on error.
+    '''
+
+    cdef uint8_t int8
+    cdef size_t len_
+    cdef uint64_t uint64
+
+    if int64 < 0:
+        uint64 = < uint64_t > -int64
+        int8 = < uint8_t > 0x80 # Highest bit set
+    else:
+        uint64 = < uint64_t > int64
+        int8 = 0
+
+    if uint64 < 0x80 and uint64 not in (INT8, INT16, INT32, INT64):
+        len_ = 0
+        int8 += < uint8_t > uint64
+    elif uint64 < UINT8_MAX:
+        len_ = 1
+        int8 += INT8
+    elif uint64 < UINT16_MAX:
+        len_ = 2
+        int8 += INT16
+    elif uint64 < UINT32_MAX:
+        len_ = 4
+        int8 += INT32
+    else:
+        len_ = 8
+        int8 += INT64
+
+    fwrite(&int8, 1, fp)
+    if len_ != 0:
+        uint64 = htole64(uint64)
+        fwrite(&uint64, len_, fp)
+
+    return len_ + 1
+
+cdef inline int read_integer(int64_t * out, FILE * fp) except -1:
+    '''Read integer written using `write_integer` from *fp*
+
+    Return the number of bytes read, or -1 on error.
+    '''
+
+    cdef uint8_t int8
+    cdef size_t len_
+    cdef uint64_t uint64
+    cdef char negative
+
+    fread(&int8, 1, fp)
+
+    if int8 & 0x80 != 0:
+        negative = 1
+        int8 = int8 & (~0x80)
+    else:
+        negative = 0
+
+    if int8 == INT8:
+        len_ = 1
+    elif int8 == INT16:
+        len_ = 2
+    elif int8 == INT32:
+        len_ = 4
+    elif int8 == INT64:
+        len_ = 8
+    else:
+        len_ = 0
+        uint64 = int8
+
+    if len_ != 0:
+        uint64 = 0
+        fread(&uint64, len_, fp)
+        uint64 = le64toh(uint64)
+
+    if negative == 1:
+        out[0] = - < int64_t > uint64
+    else:
+        out[0] = < int64_t > uint64
+
+    return len_ + 1
+
diff --git a/src/s3ql/fs.py b/src/s3ql/fs.py
index 6429d97..e0369b9 100644
--- a/src/s3ql/fs.py
+++ b/src/s3ql/fs.py
@@ -76,6 +76,12 @@ class Operations(llfuse.Operations):
     :open_inodes: dict of currently opened inodes. This is used to not remove
                   the blocks of unlinked inodes that are still open.
     :upload_event: If set, triggers a metadata upload
+    :failsafe: Set when backend problems are encountered. In that case, fs only
+               allows read access.
+    :broken_blocks: Caches information about corrupted blocks to avoid repeated (pointless)
+                    attempts to retrieve them. This attribute is a dict (indexed by inodes)
+                    of sets of block indices. Broken blocks are removed from the cache
+                    when an inode is forgotten.
  
     Multithreading
     --------------
@@ -104,6 +110,8 @@ class Operations(llfuse.Operations):
         self.open_inodes = collections.defaultdict(lambda: 0)
         self.max_obj_size = max_obj_size
         self.cache = block_cache
+        self.failsafe = False
+        self.broken_blocks = collections.defaultdict(set)
         
         # Root inode is always open
         self.open_inodes[llfuse.ROOT_INODE] += 1
@@ -178,7 +186,6 @@ class Operations(llfuse.Operations):
         args.append('no_remote_lock')
 
     def readdir(self, id_, off):
-        # FIXME: Do the returned entries acquire a lookup count?
         log.debug('readdir(%d, %d): start', id_, off)
         if off == 0:
             off = -1
@@ -257,7 +264,7 @@ class Operations(llfuse.Operations):
             raise FUSEError(ACL_ERRNO)
             
         else:
-            if self.inodes[id_].locked:
+            if self.failsafe or self.inodes[id_].locked:
                 raise FUSEError(errno.EPERM)
 
             if len(value) > deltadump.MAX_BLOB_SIZE:
@@ -270,7 +277,7 @@ class Operations(llfuse.Operations):
     def removexattr(self, id_, name):
         log.debug('removexattr(%d, %r): start', id_, name)
 
-        if self.inodes[id_].locked:
+        if self.failsafe or self.inodes[id_].locked:
             raise FUSEError(errno.EPERM)
 
         try:
@@ -288,6 +295,9 @@ class Operations(llfuse.Operations):
     def lock_tree(self, id0):
         '''Lock directory tree'''
 
+        if self.failsafe:
+            raise FUSEError(errno.EPERM)
+        
         log.debug('lock_tree(%d): start', id0)
         queue = [ id0 ]
         self.inodes[id0].locked = True
@@ -322,6 +332,9 @@ class Operations(llfuse.Operations):
     def remove_tree(self, id_p0, name0):
         '''Remove directory tree'''
 
+        if self.failsafe:
+            raise FUSEError(errno.EPERM)
+
         log.debug('remove_tree(%d, %s): start', id_p0, name0)
 
         if self.inodes[id_p0].locked:
@@ -383,6 +396,9 @@ class Operations(llfuse.Operations):
     def copy_tree(self, src_id, target_id):
         '''Efficiently copy directory tree'''
 
+        if self.failsafe:
+            raise FUSEError(errno.EPERM)
+
         log.debug('copy_tree(%d, %d): start', src_id, target_id)
 
         # To avoid lookups and make code tidier
@@ -497,7 +513,10 @@ class Operations(llfuse.Operations):
         log.debug('copy_tree(%d, %d): end', src_inode.id, target_inode.id)
 
     def unlink(self, id_p, name):
-        log.debug('rmdir(%d, %r): start', id_p, name)
+        log.debug('unlink(%d, %r): start', id_p, name)
+        if self.failsafe:
+            raise FUSEError(errno.EPERM)
+        
         inode = self.lookup(id_p, name)
 
         if stat.S_ISDIR(inode.mode):
@@ -509,6 +528,9 @@ class Operations(llfuse.Operations):
 
     def rmdir(self, id_p, name):
         log.debug('rmdir(%d, %r): start', id_p, name)
+        if self.failsafe:
+            raise FUSEError(errno.EPERM)
+        
         inode = self.lookup(id_p, name)
 
         if self.inodes[id_p].locked:
@@ -575,6 +597,9 @@ class Operations(llfuse.Operations):
     def symlink(self, id_p, name, target, ctx):
         log.debug('symlink(%d, %r, %r): start', id_p, name, target)
 
+        if self.failsafe:
+            raise FUSEError(errno.EPERM)
+
         mode = (stat.S_IFLNK | stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR |
                 stat.S_IRGRP | stat.S_IWGRP | stat.S_IXGRP |
                 stat.S_IROTH | stat.S_IWOTH | stat.S_IXOTH)
@@ -591,14 +616,15 @@ class Operations(llfuse.Operations):
         return inode
 
     def rename(self, id_p_old, name_old, id_p_new, name_new):
-        log.debug('rename(%d, %r, %d, %r): start', id_p_old, name_old, id_p_new, name_new)
+        log.debug('rename(%d, %r, %d, %r): start', id_p_old, name_old, id_p_new, name_new)        
         if name_new == CTRL_NAME or name_old == CTRL_NAME:
             log.warn('Attempted to rename s3ql control file (%s -> %s)',
                       get_path(id_p_old, self.db, name_old),
                       get_path(id_p_new, self.db, name_new))
             raise llfuse.FUSEError(errno.EACCES)
 
-        if (self.inodes[id_p_old].locked
+
+        if (self.failsafe or self.inodes[id_p_old].locked
             or self.inodes[id_p_new].locked):
             raise FUSEError(errno.EPERM)
 
@@ -732,7 +758,7 @@ class Operations(llfuse.Operations):
                      new_name, new_id_p)
             raise FUSEError(errno.EINVAL)
 
-        if inode_p.locked:
+        if self.failsafe or inode_p.locked:
             raise FUSEError(errno.EPERM)
 
         inode_p.ctime = timestamp
@@ -758,7 +784,7 @@ class Operations(llfuse.Operations):
         inode = self.inodes[id_]
         timestamp = time.time()
 
-        if inode.locked:
+        if self.failsafe or inode.locked:
             raise FUSEError(errno.EPERM)
 
         if attr.st_size is not None:
@@ -817,12 +843,16 @@ class Operations(llfuse.Operations):
 
     def mknod(self, id_p, name, mode, rdev, ctx):
         log.debug('mknod(%d, %r): start', id_p, name)
+        if self.failsafe:
+            raise FUSEError(errno.EPERM)
         inode = self._create(id_p, name, mode, ctx, rdev=rdev)
         self.open_inodes[inode.id] += 1
         return inode
 
     def mkdir(self, id_p, name, mode, ctx):
         log.debug('mkdir(%d, %r): start', id_p, name)
+        if self.failsafe:
+            raise FUSEError(errno.EPERM)
         inode = self._create(id_p, name, mode, ctx)
         self.open_inodes[inode.id] += 1
         return inode
@@ -889,7 +919,7 @@ class Operations(llfuse.Operations):
     def open(self, id_, flags):
         log.debug('open(%d): start', id_)
         if ((flags & os.O_RDWR or flags & os.O_WRONLY)
-            and self.inodes[id_].locked):
+            and (self.failsafe or self.inodes[id_].locked)):
             raise FUSEError(errno.EPERM)
 
         return id_
@@ -909,6 +939,9 @@ class Operations(llfuse.Operations):
 
     def create(self, id_p, name, mode, flags, ctx):
         log.debug('create(id_p=%d, %s): started', id_p, name)
+        if self.failsafe:
+            raise FUSEError(errno.EPERM)
+        
         try:
             id_ = self.db.get_val("SELECT inode FROM contents_v WHERE name=? AND parent_inode=?",
                                   (name, id_p))
@@ -972,7 +1005,7 @@ class Operations(llfuse.Operations):
         length = min(size - offset, length)
 
         while length > 0:
-            tmp = self._read(fh, offset, length)
+            tmp = self._readwrite(fh, offset, length=length)
             buf.write(tmp)
             length -= len(tmp)
             offset += len(tmp)
@@ -985,45 +1018,7 @@ class Operations(llfuse.Operations):
 
         return buf.getvalue()
 
-    def _read(self, id_, offset, length):
-        """Reads at the specified position until the end of the block
-
-        This method may return less than `length` bytes if a max_obj_size
-        boundary is encountered. It may also read beyond the end of
-        the file, filling the buffer with additional null bytes.
-        
-        This method releases the global lock while it is running.
-        """
-
-        # Calculate required block
-        blockno = offset // self.max_obj_size
-        offset_rel = offset - blockno * self.max_obj_size
-
-        # Don't try to read into the next block
-        if offset_rel + length > self.max_obj_size:
-            length = self.max_obj_size - offset_rel
-
-        try:
-            with self.cache.get(id_, blockno) as fh:
-                fh.seek(offset_rel)
-                buf = fh.read(length)
-
-        except NoSuchObject as exc:
-            log.warn('Backend lost block %d of inode %d (id %s)!',
-                     blockno, id_, exc.key)
-            raise
-
-        except ChecksumError as exc:
-            log.warn('Backend returned malformed data for block %d of inode %d (%s)',
-                     blockno, id_, exc)
-            raise
-
-        if len(buf) == length:
-            return buf
-        else:
-            # If we can't read enough, add null bytes
-            return buf + b"\0" * (length - len(buf))
-
+ 
     def write(self, fh, offset, buf):
         '''Handle FUSE write requests.
         
@@ -1031,20 +1026,21 @@ class Operations(llfuse.Operations):
         '''
         log.debug('write(%d, %d, datalen=%d): start', fh, offset, len(buf))
 
-        if self.inodes[fh].locked:
+        if self.failsafe or self.inodes[fh].locked:
             raise FUSEError(errno.EPERM)
 
         total = len(buf)
         minsize = offset + total
         while buf:
-            written = self._write(fh, offset, buf)
+            written = self._readwrite(fh, offset, buf=buf)
             offset += written
             buf = buf[written:]
 
         # Update file size if changed
         # Fuse does not ensure that we do not get concurrent write requests,
         # so we have to be careful not to undo a size extension made by
-        # a concurrent write.
+        # a concurrent write (because _readwrite() releases the global
+        # lock).
         timestamp = time.time()
         inode = self.inodes[fh]
         inode.size = max(inode.size, minsize)
@@ -1054,11 +1050,17 @@ class Operations(llfuse.Operations):
         return total
 
 
-    def _write(self, id_, offset, buf):
-        """Write as much as we can.
+    # In Python 3, the last two should be mandatory keyword 
+    # arguments
+    def _readwrite(self, id_, offset, buf=None, length=None):
+        """Read or write as much as we can.
 
-        May write less bytes than given in `buf`, returns
-        the number of bytes written.
+        If *buf* is None, read and return up to *length* bytes.
+        
+        If *length* is None, write from *buf* and return the number of
+        bytes written.
+        
+        This is one method to reduce code duplication.
         
         This method releases the global lock while it is running.
         """
@@ -1067,27 +1069,51 @@ class Operations(llfuse.Operations):
         blockno = offset // self.max_obj_size
         offset_rel = offset - blockno * self.max_obj_size
 
-        # Don't try to write into the next block
-        if offset_rel + len(buf) > self.max_obj_size:
-            buf = buf[:self.max_obj_size - offset_rel]
-
+        if id_ in self.broken_blocks and blockno in self.broken_blocks[id_]:
+            raise FUSEError(errno.EIO)
+        
+        if length is None:
+            write = True
+            length = len(buf)
+        elif buf is None:
+            write = False
+        else:
+            raise TypeError("Don't know what to do!")
+        
+        # Don't try to write/read into the next block
+        if offset_rel + length > self.max_obj_size:
+            length = self.max_obj_size - offset_rel
+            
         try:
             with self.cache.get(id_, blockno) as fh:
                 fh.seek(offset_rel)
-                fh.write(buf)
-
+                if write:
+                    fh.write(buf[:length])
+                else:
+                    buf = fh.read(length)
+                        
         except NoSuchObject as exc:
-            log.warn('Backend lost block %d of inode %d (id %s)!',
-                     blockno, id_, exc.key)
-            raise
+            log.error('Backend lost block %d of inode %d (id %s)!',
+                      blockno, id_, exc.key)
+            self.failsafe = True
+            self.broken_blocks[id_].add(blockno)
+            raise FUSEError(errno.EIO)
 
         except ChecksumError as exc:
-            log.warn('Backend returned malformed data for block %d of inode %d (%s)',
+            log.error('Backend returned malformed data for block %d of inode %d (%s)',
                      blockno, id_, exc)
-            raise
-
-        return len(buf)
+            self.failsafe = True
+            self.broken_blocks[id_].add(blockno)
+            raise FUSEError(errno.EIO)
 
+        if write:
+            return length
+        elif len(buf) == length:
+            return buf
+        else:
+            # If we can't read enough, add null bytes
+            return buf + b"\0" * (length - len(buf))
+        
     def fsync(self, fh, datasync):
         log.debug('fsync(%d, %s): start', fh, datasync)
         if not datasync:
@@ -1103,6 +1129,8 @@ class Operations(llfuse.Operations):
 
             if self.open_inodes[id_] == 0:
                 del self.open_inodes[id_]
+                if id_ in self.broken_blocks:
+                    del self.broken_blocks[id_]
 
                 inode = self.inodes[id_]
                 if inode.refcount == 0:
@@ -1135,6 +1163,7 @@ class Operations(llfuse.Operations):
     def flush(self, fh):
         log.debug('flush(%d): start', fh)
 
+        
 def update_logging(level, modules):
     root_logger = logging.getLogger()
     if level == logging.DEBUG:
diff --git a/src/s3ql/fsck.py b/src/s3ql/fsck.py
index 7d35f40..c178ac5 100644
--- a/src/s3ql/fsck.py
+++ b/src/s3ql/fsck.py
@@ -1171,15 +1171,10 @@ def main(args=None):
             return tmpfh
         log.info('Downloading and decompressing metadata...')
         tmpfh = backend.perform_read(do_read, "s3ql_metadata")
-        os.close(os.open(cachepath + '.db.tmp', os.O_RDWR | os.O_CREAT | os.O_TRUNC,
-                         stat.S_IRUSR | stat.S_IWUSR))
-        db = Connection(cachepath + '.db.tmp', fast_mode=True)
+        
         log.info("Reading metadata...")
         tmpfh.seek(0)
-        restore_metadata(tmpfh, db)
-        db.close()
-        os.rename(cachepath + '.db.tmp', cachepath + '.db')
-        db = Connection(cachepath + '.db')
+        db = restore_metadata(tmpfh, cachepath + '.db')
 
     # Increase metadata sequence no 
     param['seq_no'] += 1
diff --git a/src/s3ql/metadata.py b/src/s3ql/metadata.py
index cc0cd49..74b44dc 100644
--- a/src/s3ql/metadata.py
+++ b/src/s3ql/metadata.py
@@ -7,9 +7,11 @@ This program can be distributed under the terms of the GNU GPLv3.
 '''
 
 from __future__ import division, print_function, absolute_import
-
-from .deltadump import (INTEGER, BLOB, TIME, dump_table, load_table)
+from .deltadump import INTEGER, BLOB, TIME, dump_table, load_table
+from .database import Connection
 import logging
+import os
+import stat
 
 log = logging.getLogger('metadata')
 
@@ -61,18 +63,47 @@ DUMP_SPEC = [
 
 
 
-def restore_metadata(fh, db):
-    '''Read metadata from *fh* and write into *db*
+def restore_metadata(fh, dbfile):
+    '''Read metadata from *fh* and write into *dbfile*
+    
+    Return database connection to *dbfile*.
     
     *fh* must be able to return an actual file descriptor from
     its `fileno` method.
+    
+    *dbfile* will be created with 0600 permissions. Data is
+    first written into a temporary file *dbfile* + '.tmp', and
+    the file is renamed once all data has been loaded.
+    
+    
     '''
 
-    create_tables(db)
-    for (table, _, columns) in DUMP_SPEC:
-        log.info('..%s..', table)
-        load_table(table, columns, db=db, fh=fh)
-    db.execute('ANALYZE')
+    tmpfile = dbfile + '.tmp'
+    fd = os.open(tmpfile, os.O_RDWR | os.O_CREAT | os.O_TRUNC,
+                 stat.S_IRUSR | stat.S_IWUSR)
+    try:
+        os.close(fd)
+    
+        db = Connection(tmpfile)
+        db.execute('PRAGMA locking_mode = NORMAL')
+        db.execute('PRAGMA synchronous = OFF')
+        db.execute('PRAGMA journal_mode = OFF')
+        create_tables(db)
+        
+        for (table, _, columns) in DUMP_SPEC:
+            log.info('..%s..', table)
+            load_table(table, columns, db=db, fh=fh)
+        db.execute('ANALYZE')
+        
+        # We must close the database to rename it
+        db.close()
+    except:
+        os.unlink(tmpfile)
+        raise
+    
+    os.rename(tmpfile, dbfile)
+    
+    return Connection(dbfile)
 
 def cycle_metadata(backend):
     from .backends.common import NoSuchObject
@@ -80,11 +111,11 @@ def cycle_metadata(backend):
     log.info('Backing up old metadata...')
     for i in reversed(range(10)):
         try:
-            backend.copy("s3ql_metadata_bak_%d" % i, "s3ql_metadata_bak_%d" % (i + 1))
+            backend.rename("s3ql_metadata_bak_%d" % i, "s3ql_metadata_bak_%d" % (i + 1))
         except NoSuchObject:
             pass
 
-    backend.copy("s3ql_metadata", "s3ql_metadata_bak_0")
+    backend.rename("s3ql_metadata", "s3ql_metadata_bak_0")
 
 def dump_metadata(db, fh):
     '''Dump metadata into fh
@@ -93,10 +124,21 @@ def dump_metadata(db, fh):
     its `fileno` method.
     '''
 
-    for (table, order, columns) in DUMP_SPEC:
-        log.info('..%s..', table)
-        dump_table(table, order, columns, db=db, fh=fh)
-
+    locking_mode = db.get_val('PRAGMA locking_mode')
+    try:
+        # Ensure that we don't hold a lock on the db
+        # (need to access DB to actually release locks)
+        db.execute('PRAGMA locking_mode = NORMAL')
+        db.has_val('SELECT rowid FROM %s LIMIT 1' % DUMP_SPEC[0][0])
+        
+        for (table, order, columns) in DUMP_SPEC:
+            log.info('..%s..', table)
+            dump_table(table, order, columns, db=db, fh=fh)
+    
+    finally:
+        db.execute('PRAGMA locking_mode = %s' % locking_mode)
+        
+        
 def create_tables(conn):
     # Table of storage objects
     # Refcount is included for performance reasons
diff --git a/src/s3ql/mount.py b/src/s3ql/mount.py
index ec19407..ae1ea4f 100644
--- a/src/s3ql/mount.py
+++ b/src/s3ql/mount.py
@@ -24,7 +24,6 @@ import llfuse
 import logging
 import os
 import signal
-import stat
 import sys
 import tempfile
 import thread
@@ -206,6 +205,9 @@ def main(args=None):
     # Do not update .params yet, dump_metadata() may fail if the database is
     # corrupted, in which case we want to force an fsck.
     param['max_inode'] = db.get_val('SELECT MAX(id) FROM inodes')
+    if operations.failsafe:
+        log.warn('File system errors encountered, marking for fsck.')
+        param['needs_fsck'] = True
     with backend_pool() as backend:
         seq_no = get_seq_no(backend)
         if metadata_upload_thread.db_mtime == os.stat(cachepath + '.db').st_mtime:
@@ -246,17 +248,15 @@ def main(args=None):
     db.close()
 
     if options.profile:
-        tmp = tempfile.NamedTemporaryFile()
-        prof.dump_stats(tmp.name)
-        fh = open('s3ql_profile.txt', 'w')
-        p = pstats.Stats(tmp.name, stream=fh)
-        tmp.close()
-        p.strip_dirs()
-        p.sort_stats('cumulative')
-        p.print_stats(50)
-        p.sort_stats('time')
-        p.print_stats(50)
-        fh.close()
+        with tempfile.NamedTemporaryFile() as tmp, \
+            open('s3ql_profile.txt', 'w') as fh:
+            prof.dump_stats(tmp.name)
+            p = pstats.Stats(tmp.name, stream=fh)
+            p.strip_dirs()
+            p.sort_stats('cumulative')
+            p.print_stats(50)
+            p.sort_stats('time')
+            p.print_stats(50)
 
 def determine_threads(options):
     '''Return optimum number of upload threads'''
@@ -341,15 +341,9 @@ def get_metadata(backend, cachepath):
             return tmpfh
         log.info('Downloading and decompressing metadata...')
         tmpfh = backend.perform_read(do_read, "s3ql_metadata")
-        os.close(os.open(cachepath + '.db.tmp', os.O_RDWR | os.O_CREAT | os.O_TRUNC,
-                         stat.S_IRUSR | stat.S_IWUSR))
-        db = Connection(cachepath + '.db.tmp', fast_mode=True)
         log.info("Reading metadata...")
         tmpfh.seek(0)
-        restore_metadata(tmpfh, db)
-        db.close()
-        os.rename(cachepath + '.db.tmp', cachepath + '.db')
-        db = Connection(cachepath + '.db')
+        db = restore_metadata(tmpfh, cachepath + '.db')
 
     # Increase metadata sequence no 
     param['seq_no'] += 1
@@ -663,7 +657,7 @@ def timed_wait(event, timeout, interval=1):
     which causes noticeable CPU consumption. Therefore, for Python 2 we we 
     implement our own poll loop that runs at a rate of our own choosing.
     '''
-    if sys.version_info[0] > 2:
+    if sys.version_info[0] > 2 or timeout is None:
         return event.wait(timeout)
 
     endtime = time.time() + timeout
diff --git a/src/s3ql/parse_args.py b/src/s3ql/parse_args.py
index de8d762..044527e 100644
--- a/src/s3ql/parse_args.py
+++ b/src/s3ql/parse_args.py
@@ -46,7 +46,7 @@ import sys
 
 DEFAULT_USAGE = object()
 
-class HelpFormatter(argparse.ArgumentDefaultsHelpFormatter):
+class HelpFormatter(argparse.HelpFormatter):
 
     def _format_usage(self, usage, actions, groups, prefix):
         '''Special handling for usage lists