1 /* ioapi.c -- IO base function header for compress/uncompress .zip 2 files using zlib + zip or unzip API 3 4 Version 1.01e, February 12th, 2005 5 6 Copyright (C) 1998-2005 Gilles Vollant 7 */ 8 9 #include <stdio.h> 10 #include <stdlib.h> 11 #include <string.h> 12 13 #if defined(USE_SYSTEM_ZLIB) 14 #include <zlib.h> 15 #else 16 #include "third_party/zlib/zlib.h" 17 #endif 18 19 #include "ioapi.h" 20 21 /* I've found an old Unix (a SunOS 4.1.3_U1) without all SEEK_* defined.... */ 22 23 #ifndef SEEK_CUR 24 #define SEEK_CUR 1 25 #endif 26 27 #ifndef SEEK_END 28 #define SEEK_END 2 29 #endif 30 31 #ifndef SEEK_SET 32 #define SEEK_SET 0 33 #endif 34 35 voidpf ZCALLBACK fopen_file_func OF(( 36 voidpf opaque, 37 const char* filename, 38 int mode)); 39 40 uLong ZCALLBACK fread_file_func OF(( 41 voidpf opaque, 42 voidpf stream, 43 void* buf, 44 uLong size)); 45 46 uLong ZCALLBACK fwrite_file_func OF(( 47 voidpf opaque, 48 voidpf stream, 49 const void* buf, 50 uLong size)); 51 52 long ZCALLBACK ftell_file_func OF(( 53 voidpf opaque, 54 voidpf stream)); 55 56 long ZCALLBACK fseek_file_func OF(( 57 voidpf opaque, 58 voidpf stream, 59 uLong offset, 60 int origin)); 61 62 int ZCALLBACK fclose_file_func OF(( 63 voidpf opaque, 64 voidpf stream)); 65 66 int ZCALLBACK ferror_file_func OF(( 67 voidpf opaque, 68 voidpf stream)); 69 70 71 voidpf ZCALLBACK fopen_file_func (opaque, filename, mode) 72 voidpf opaque; 73 const char* filename; 74 int mode; 75 { 76 FILE* file = NULL; 77 const char* mode_fopen = NULL; 78 if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER)==ZLIB_FILEFUNC_MODE_READ) 79 mode_fopen = "rb"; 80 else 81 if (mode & ZLIB_FILEFUNC_MODE_EXISTING) 82 mode_fopen = "r+b"; 83 else 84 if (mode & ZLIB_FILEFUNC_MODE_CREATE) 85 mode_fopen = "wb"; 86 87 if ((filename!=NULL) && (mode_fopen != NULL)) 88 file = fopen(filename, mode_fopen); 89 return file; 90 } 91 92 93 uLong ZCALLBACK fread_file_func (opaque, stream, buf, size) 94 voidpf opaque; 95 voidpf stream; 96 void* buf; 97 uLong size; 98 { 99 uLong ret; 100 ret = (uLong)fread(buf, 1, (size_t)size, (FILE *)stream); 101 return ret; 102 } 103 104 105 uLong ZCALLBACK fwrite_file_func (opaque, stream, buf, size) 106 voidpf opaque; 107 voidpf stream; 108 const void* buf; 109 uLong size; 110 { 111 uLong ret; 112 ret = (uLong)fwrite(buf, 1, (size_t)size, (FILE *)stream); 113 return ret; 114 } 115 116 long ZCALLBACK ftell_file_func (opaque, stream) 117 voidpf opaque; 118 voidpf stream; 119 { 120 long ret; 121 ret = ftell((FILE *)stream); 122 return ret; 123 } 124 125 long ZCALLBACK fseek_file_func (opaque, stream, offset, origin) 126 voidpf opaque; 127 voidpf stream; 128 uLong offset; 129 int origin; 130 { 131 int fseek_origin=0; 132 long ret; 133 switch (origin) 134 { 135 case ZLIB_FILEFUNC_SEEK_CUR : 136 fseek_origin = SEEK_CUR; 137 break; 138 case ZLIB_FILEFUNC_SEEK_END : 139 fseek_origin = SEEK_END; 140 break; 141 case ZLIB_FILEFUNC_SEEK_SET : 142 fseek_origin = SEEK_SET; 143 break; 144 default: return -1; 145 } 146 ret = 0; 147 fseek((FILE *)stream, offset, fseek_origin); 148 return ret; 149 } 150 151 int ZCALLBACK fclose_file_func (opaque, stream) 152 voidpf opaque; 153 voidpf stream; 154 { 155 int ret; 156 ret = fclose((FILE *)stream); 157 return ret; 158 } 159 160 int ZCALLBACK ferror_file_func (opaque, stream) 161 voidpf opaque; 162 voidpf stream; 163 { 164 int ret; 165 ret = ferror((FILE *)stream); 166 return ret; 167 } 168 169 void fill_fopen_filefunc (pzlib_filefunc_def) 170 zlib_filefunc_def* pzlib_filefunc_def; 171 { 172 pzlib_filefunc_def->zopen_file = fopen_file_func; 173 pzlib_filefunc_def->zread_file = fread_file_func; 174 pzlib_filefunc_def->zwrite_file = fwrite_file_func; 175 pzlib_filefunc_def->ztell_file = ftell_file_func; 176 pzlib_filefunc_def->zseek_file = fseek_file_func; 177 pzlib_filefunc_def->zclose_file = fclose_file_func; 178 pzlib_filefunc_def->zerror_file = ferror_file_func; 179 pzlib_filefunc_def->opaque = NULL; 180 } 181
