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/*****************************************************************************
* zstr.h - code for class 'zStr'- a module that reads compressed text
* files.
* and provides lookup and parsing functions based on
* class StrKey
*
* $Id: zstr.h 2303 2009-04-06 13:38:34Z scribe $
*
* Copyright 1998 CrossWire Bible Society (http://www.crosswire.org)
* CrossWire Bible Society
* P. O. Box 2528
* Tempe, AZ 85280-2528
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
*/
#ifndef ZSTR_H
#define ZSTR_H
#include <defs.h>
SWORD_NAMESPACE_START
class SWCompress;
class EntriesBlock;
class FileDesc;
class SWBuf;
class SWDLLEXPORT zStr {
private:
static int instance; // number of instantiated zStr objects or derivitives
EntriesBlock *cacheBlock;
long cacheBlockIndex;
bool cacheDirty;
char *path;
mutable long lastoff; // for caching and optimization
long blockCount;
SWCompress *compressor;
protected:
FileDesc *idxfd;
FileDesc *datfd;
FileDesc *zdxfd;
FileDesc *zdtfd;
static const int IDXENTRYSIZE;
static const int ZDXENTRYSIZE;
void getCompressedText(long block, long entry, char **buf);
void flushCache();
void getKeyFromDatOffset(long ioffset, char **buf) const;
void getKeyFromIdxOffset(long ioffset, char **buf) const;
public:
char nl;
zStr(const char *ipath, int fileMode = -1, long blockCount = 100, SWCompress *icomp = 0);
virtual ~zStr();
signed char findKeyIndex(const char *ikey, long *idxoff, long away = 0) const;
void getText(long index, char **idxbuf, char **buf);
void setText(const char *ikey, const char *buf, long len = -1);
void linkEntry(const char *destkey, const char *srckey);
virtual void rawZFilter(SWBuf &buf, char direction = 0) {}
static signed char createModule (const char *path);
};
SWORD_NAMESPACE_END
#endif
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