178 lines
3.6 KiB
C
178 lines
3.6 KiB
C
/* ioapi.c -- IO base function header for compress/uncompress .zip
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files using zlib + zip or unzip API
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Version 1.01e, February 12th, 2005
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Copyright (C) 1998-2005 Gilles Vollant
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "zlib.h"
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#include "ioapi.h"
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/* I've found an old Unix (a SunOS 4.1.3_U1) without all SEEK_* defined.... */
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#ifndef SEEK_CUR
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#define SEEK_CUR 1
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#endif
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#ifndef SEEK_END
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#define SEEK_END 2
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#endif
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#ifndef SEEK_SET
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#define SEEK_SET 0
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#endif
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voidpf ZCALLBACK fopen_file_func OF((
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voidpf opaque,
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const char* filename,
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int mode));
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uLong ZCALLBACK fread_file_func OF((
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voidpf opaque,
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voidpf stream,
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void* buf,
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uLong size));
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uLong ZCALLBACK fwrite_file_func OF((
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voidpf opaque,
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voidpf stream,
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const void* buf,
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uLong size));
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long ZCALLBACK ftell_file_func OF((
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voidpf opaque,
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voidpf stream));
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long ZCALLBACK fseek_file_func OF((
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voidpf opaque,
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voidpf stream,
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uLong offset,
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int origin));
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int ZCALLBACK fclose_file_func OF((
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voidpf opaque,
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voidpf stream));
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int ZCALLBACK ferror_file_func OF((
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voidpf opaque,
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voidpf stream));
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voidpf ZCALLBACK fopen_file_func (opaque, filename, mode)
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voidpf opaque;
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const char* filename;
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int mode;
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{
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FILE* file = NULL;
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const char* mode_fopen = NULL;
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if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER)==ZLIB_FILEFUNC_MODE_READ)
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mode_fopen = "rb";
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else
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if (mode & ZLIB_FILEFUNC_MODE_EXISTING)
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mode_fopen = "r+b";
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else
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if (mode & ZLIB_FILEFUNC_MODE_CREATE)
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mode_fopen = "wb";
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if ((filename!=NULL) && (mode_fopen != NULL))
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file = fopen(filename, mode_fopen);
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return file;
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}
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uLong ZCALLBACK fread_file_func (opaque, stream, buf, size)
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voidpf opaque;
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voidpf stream;
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void* buf;
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uLong size;
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{
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uLong ret;
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ret = (uLong)fread(buf, 1, (size_t)size, (FILE *)stream);
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return ret;
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}
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uLong ZCALLBACK fwrite_file_func (opaque, stream, buf, size)
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voidpf opaque;
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voidpf stream;
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const void* buf;
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uLong size;
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{
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uLong ret;
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ret = (uLong)fwrite(buf, 1, (size_t)size, (FILE *)stream);
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return ret;
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}
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long ZCALLBACK ftell_file_func (opaque, stream)
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voidpf opaque;
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voidpf stream;
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{
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long ret;
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ret = ftell((FILE *)stream);
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return ret;
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}
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long ZCALLBACK fseek_file_func (opaque, stream, offset, origin)
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voidpf opaque;
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voidpf stream;
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uLong offset;
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int origin;
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{
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int fseek_origin=0;
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long ret;
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switch (origin)
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{
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case ZLIB_FILEFUNC_SEEK_CUR :
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fseek_origin = SEEK_CUR;
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break;
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case ZLIB_FILEFUNC_SEEK_END :
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fseek_origin = SEEK_END;
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break;
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case ZLIB_FILEFUNC_SEEK_SET :
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fseek_origin = SEEK_SET;
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break;
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default: return -1;
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}
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ret = 0;
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fseek((FILE *)stream, offset, fseek_origin);
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return ret;
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}
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int ZCALLBACK fclose_file_func (opaque, stream)
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voidpf opaque;
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voidpf stream;
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{
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int ret;
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ret = fclose((FILE *)stream);
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return ret;
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}
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int ZCALLBACK ferror_file_func (opaque, stream)
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voidpf opaque;
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voidpf stream;
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{
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int ret;
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ret = ferror((FILE *)stream);
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return ret;
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}
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void fill_fopen_filefunc (pzlib_filefunc_def)
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zlib_filefunc_def* pzlib_filefunc_def;
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{
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pzlib_filefunc_def->zopen_file = fopen_file_func;
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pzlib_filefunc_def->zread_file = fread_file_func;
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pzlib_filefunc_def->zwrite_file = fwrite_file_func;
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pzlib_filefunc_def->ztell_file = ftell_file_func;
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pzlib_filefunc_def->zseek_file = fseek_file_func;
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pzlib_filefunc_def->zclose_file = fclose_file_func;
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pzlib_filefunc_def->zerror_file = ferror_file_func;
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pzlib_filefunc_def->opaque = NULL;
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}
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