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mz_strm_os_posix.c
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mz_strm_os_posix.c
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/* mz_strm_posix.c -- Stream for filesystem access for posix/linux
part of the minizip-ng project
Copyright (C) Nathan Moinvaziri
https://github.com/zlib-ng/minizip-ng
Modifications for Zip64 support
Copyright (C) 2009-2010 Mathias Svensson
http://result42.com
Copyright (C) 1998-2010 Gilles Vollant
https://www.winimage.com/zLibDll/minizip.html
This program is distributed under the terms of the same license as zlib.
See the accompanying LICENSE file for the full text of the license.
*/
#include "mz.h"
#include "mz_strm.h"
#include "mz_strm_os.h"
#include <stdio.h> /* fopen, fread.. */
#include <errno.h>
/***************************************************************************/
#define fopen64 fopen
#ifndef MZ_FILE32_API
# ifndef NO_FSEEKO
# define ftello64 ftello
# define fseeko64 fseeko
# elif defined(_MSC_VER) && (_MSC_VER >= 1400)
# define ftello64 _ftelli64
# define fseeko64 _fseeki64
# endif
#endif
#ifndef ftello64
# define ftello64 ftell
#endif
#ifndef fseeko64
# define fseeko64 fseek
#endif
/***************************************************************************/
static mz_stream_vtbl mz_stream_os_vtbl = {
mz_stream_os_open,
mz_stream_os_is_open,
mz_stream_os_read,
mz_stream_os_write,
mz_stream_os_tell,
mz_stream_os_seek,
mz_stream_os_close,
mz_stream_os_error,
mz_stream_os_create,
mz_stream_os_delete,
NULL,
NULL
};
/***************************************************************************/
typedef struct mz_stream_posix_s {
mz_stream stream;
int32_t error;
FILE *handle;
} mz_stream_posix;
/***************************************************************************/
int32_t mz_stream_os_open(void *stream, const char *path, int32_t mode) {
mz_stream_posix *posix = (mz_stream_posix *)stream;
const char *mode_fopen = NULL;
if (!path)
return MZ_PARAM_ERROR;
if ((mode & MZ_OPEN_MODE_READWRITE) == MZ_OPEN_MODE_READ)
mode_fopen = "rb";
else if (mode & MZ_OPEN_MODE_APPEND)
mode_fopen = "r+b";
else if (mode & MZ_OPEN_MODE_CREATE)
mode_fopen = "wb";
else
return MZ_OPEN_ERROR;
posix->handle = fopen64(path, mode_fopen);
if (!posix->handle) {
posix->error = errno;
return MZ_OPEN_ERROR;
}
if (mode & MZ_OPEN_MODE_APPEND)
return mz_stream_os_seek(stream, 0, MZ_SEEK_END);
return MZ_OK;
}
int32_t mz_stream_os_is_open(void *stream) {
mz_stream_posix *posix = (mz_stream_posix *)stream;
if (!posix->handle)
return MZ_OPEN_ERROR;
return MZ_OK;
}
int32_t mz_stream_os_read(void *stream, void *buf, int32_t size) {
mz_stream_posix *posix = (mz_stream_posix *)stream;
int32_t read = (int32_t)fread(buf, 1, (size_t)size, posix->handle);
if (read < size && ferror(posix->handle)) {
posix->error = errno;
return MZ_READ_ERROR;
}
return read;
}
int32_t mz_stream_os_write(void *stream, const void *buf, int32_t size) {
mz_stream_posix *posix = (mz_stream_posix *)stream;
int32_t written = (int32_t)fwrite(buf, 1, (size_t)size, posix->handle);
if (written < size && ferror(posix->handle)) {
posix->error = errno;
return MZ_WRITE_ERROR;
}
return written;
}
int64_t mz_stream_os_tell(void *stream) {
mz_stream_posix *posix = (mz_stream_posix *)stream;
int64_t position = ftello64(posix->handle);
if (position == -1) {
posix->error = errno;
return MZ_TELL_ERROR;
}
return position;
}
int32_t mz_stream_os_seek(void *stream, int64_t offset, int32_t origin) {
mz_stream_posix *posix = (mz_stream_posix *)stream;
int32_t fseek_origin = 0;
switch (origin) {
case MZ_SEEK_CUR:
fseek_origin = SEEK_CUR;
break;
case MZ_SEEK_END:
fseek_origin = SEEK_END;
break;
case MZ_SEEK_SET:
fseek_origin = SEEK_SET;
break;
default:
return MZ_SEEK_ERROR;
}
if (fseeko64(posix->handle, offset, fseek_origin) != 0) {
posix->error = errno;
return MZ_SEEK_ERROR;
}
return MZ_OK;
}
int32_t mz_stream_os_close(void *stream) {
mz_stream_posix *posix = (mz_stream_posix *)stream;
int32_t closed = 0;
if (posix->handle) {
closed = fclose(posix->handle);
posix->handle = NULL;
}
if (closed != 0) {
posix->error = errno;
return MZ_CLOSE_ERROR;
}
return MZ_OK;
}
int32_t mz_stream_os_error(void *stream) {
mz_stream_posix *posix = (mz_stream_posix *)stream;
return posix->error;
}
void *mz_stream_os_create(void **stream) {
mz_stream_posix *posix = NULL;
posix = (mz_stream_posix *)calloc(1, sizeof(mz_stream_posix));
if (posix)
posix->stream.vtbl = &mz_stream_os_vtbl;
if (stream)
*stream = posix;
return posix;
}
void mz_stream_os_delete(void **stream) {
mz_stream_posix *posix = NULL;
if (!stream)
return;
posix = (mz_stream_posix *)*stream;
if (posix)
free(posix);
*stream = NULL;
}
void *mz_stream_os_get_interface(void) {
return (void *)&mz_stream_os_vtbl;
}