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/*
* vfs_local.c
* Copyright 2009-2014 John Lindgren
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions, and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions, and the following disclaimer in the documentation
* provided with the distribution.
*
* This software is provided "as is" and without any warranty, express or
* implied. In no event shall the authors be liable for any damages arising from
* the use of this software.
*/
#include "vfs_local.h"
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <glib.h>
#include <glib/gstdio.h>
#include "audstrings.h"
#ifdef _WIN32
#define fseeko fseeko64
#define ftello ftello64
#endif
typedef enum {
OP_NONE,
OP_READ,
OP_WRITE
} LocalOp;
typedef struct {
char * path;
FILE * stream;
int64_t cached_size;
LocalOp last_op;
} LocalFile;
static void * local_fopen (const char * uri, const char * mode)
{
char * path = uri_to_filename (uri);
g_return_val_if_fail (path, NULL);
const char * suffix = "";
#ifdef _WIN32
if (! strchr (mode, 'b')) /* binary mode (Windows) */
suffix = "b";
#else
if (! strchr (mode, 'e')) /* close on exec (POSIX) */
suffix = "e";
#endif
SCONCAT2 (mode2, mode, suffix);
FILE * stream = g_fopen (path, mode2);
if (! stream)
{
perror (path);
str_unref (path);
return NULL;
}
LocalFile * local = g_slice_new (LocalFile);
local->path = path;
local->stream = stream;
local->cached_size = -1;
local->last_op = OP_NONE;
return local;
}
static int local_fclose (VFSFile * file)
{
LocalFile * local = vfs_get_handle (file);
int result = fclose (local->stream);
if (result < 0)
perror (local->path);
str_unref (local->path);
g_slice_free (LocalFile, local);
return result;
}
static int64_t local_fread (void * ptr, int64_t size, int64_t nitems, VFSFile * file)
{
LocalFile * local = vfs_get_handle (file);
if (local->last_op == OP_WRITE)
{
if (fseeko (local->stream, 0, SEEK_CUR) < 0) /* flush buffers */
{
perror (local->path);
return 0;
}
}
local->last_op = OP_READ;
clearerr (local->stream);
int64_t result = fread (ptr, size, nitems, local->stream);
if (result < nitems && ferror (local->stream))
perror (local->path);
return result;
}
static int64_t local_fwrite (const void * ptr, int64_t size, int64_t nitems, VFSFile * file)
{
LocalFile * local = vfs_get_handle (file);
if (local->last_op == OP_READ)
{
if (fseeko (local->stream, 0, SEEK_CUR) < 0) /* flush buffers */
{
perror (local->path);
return 0;
}
}
local->last_op = OP_WRITE;
local->cached_size = -1;
clearerr (local->stream);
int64_t result = fwrite (ptr, size, nitems, local->stream);
if (result < nitems && ferror (local->stream))
perror (local->path);
return result;
}
static int local_fseek (VFSFile * file, int64_t offset, int whence)
{
LocalFile * local = vfs_get_handle (file);
int result = fseeko (local->stream, offset, whence);
if (result < 0)
perror (local->path);
if (result == 0)
local->last_op = OP_NONE;
return result;
}
static int64_t local_ftell (VFSFile * file)
{
LocalFile * local = vfs_get_handle (file);
return ftello (local->stream);
}
static bool_t local_feof (VFSFile * file)
{
LocalFile * local = vfs_get_handle (file);
return feof (local->stream);
}
static int local_ftruncate (VFSFile * file, int64_t length)
{
LocalFile * local = vfs_get_handle (file);
if (local->last_op != OP_NONE)
{
if (fseeko (local->stream, 0, SEEK_CUR) < 0) /* flush buffers */
{
perror (local->path);
return 0;
}
}
int result = ftruncate (fileno (local->stream), length);
if (result < 0)
perror (local->path);
if (result == 0)
{
local->last_op = OP_NONE;
local->cached_size = length;
}
return result;
}
static int64_t local_fsize (VFSFile * file)
{
LocalFile * local = vfs_get_handle (file);
if (local->cached_size >= 0)
return local->cached_size;
int64_t saved_pos = ftello (local->stream);
if (local_fseek (file, 0, SEEK_END) < 0)
return -1;
int64_t length = ftello (local->stream);
if (local_fseek (file, saved_pos, SEEK_SET) < 0)
return -1;
return length;
}
VFSConstructor vfs_local_vtable = {
.vfs_fopen_impl = local_fopen,
.vfs_fclose_impl = local_fclose,
.vfs_fread_impl = local_fread,
.vfs_fwrite_impl = local_fwrite,
.vfs_fseek_impl = local_fseek,
.vfs_ftell_impl = local_ftell,
.vfs_feof_impl = local_feof,
.vfs_ftruncate_impl = local_ftruncate,
.vfs_fsize_impl = local_fsize
};
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