1 | /* ioapi.c -- IO base function header for compress/uncompress .zip |
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2 | files using zlib + zip or unzip API |
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3 | |
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4 | Version 1.01, May 8th, 2004 |
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5 | |
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6 | Copyright (C) 1998-2004 Gilles Vollant |
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7 | */ |
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8 | |
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9 | #include <stdio.h> |
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10 | #include <stdlib.h> |
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11 | #include <string.h> |
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12 | |
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13 | #include "zlib.h" |
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14 | #include "ioapi.h" |
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15 | |
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16 | |
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17 | |
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18 | /* I've found an old Unix (a SunOS 4.1.3_U1) without all SEEK_* defined.... */ |
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19 | |
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20 | #ifndef SEEK_CUR |
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21 | #define SEEK_CUR 1 |
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22 | #endif |
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23 | |
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24 | #ifndef SEEK_END |
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25 | #define SEEK_END 2 |
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26 | #endif |
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27 | |
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28 | #ifndef SEEK_SET |
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29 | #define SEEK_SET 0 |
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30 | #endif |
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31 | |
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32 | voidpf ZCALLBACK fopen_file_func OF(( |
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33 | voidpf opaque, |
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34 | const char* filename, |
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35 | int mode)); |
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36 | |
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37 | uLong ZCALLBACK fread_file_func OF(( |
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38 | voidpf opaque, |
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39 | voidpf stream, |
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40 | void* buf, |
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41 | uLong size)); |
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42 | |
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43 | uLong ZCALLBACK fwrite_file_func OF(( |
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44 | voidpf opaque, |
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45 | voidpf stream, |
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46 | const void* buf, |
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47 | uLong size)); |
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48 | |
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49 | long ZCALLBACK ftell_file_func OF(( |
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50 | voidpf opaque, |
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51 | voidpf stream)); |
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52 | |
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53 | long ZCALLBACK fseek_file_func OF(( |
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54 | voidpf opaque, |
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55 | voidpf stream, |
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56 | uLong offset, |
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57 | int origin)); |
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58 | |
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59 | int ZCALLBACK fclose_file_func OF(( |
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60 | voidpf opaque, |
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61 | voidpf stream)); |
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62 | |
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63 | int ZCALLBACK ferror_file_func OF(( |
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64 | voidpf opaque, |
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65 | voidpf stream)); |
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66 | |
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67 | |
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68 | voidpf ZCALLBACK fopen_file_func (opaque, filename, mode) |
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69 | voidpf opaque; |
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70 | const char* filename; |
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71 | int mode; |
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72 | { |
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73 | FILE* file = NULL; |
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74 | const char* mode_fopen = NULL; |
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75 | if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER)==ZLIB_FILEFUNC_MODE_READ) |
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76 | mode_fopen = "rb"; |
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77 | else |
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78 | if (mode & ZLIB_FILEFUNC_MODE_EXISTING) |
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79 | mode_fopen = "r+b"; |
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80 | else |
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81 | if (mode & ZLIB_FILEFUNC_MODE_CREATE) |
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82 | mode_fopen = "wb"; |
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83 | |
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84 | if ((filename!=NULL) && (mode_fopen != NULL)) |
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85 | file = fopen(filename, mode_fopen); |
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86 | return file; |
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87 | } |
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88 | |
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89 | |
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90 | uLong ZCALLBACK fread_file_func (opaque, stream, buf, size) |
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91 | voidpf opaque; |
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92 | voidpf stream; |
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93 | void* buf; |
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94 | uLong size; |
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95 | { |
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96 | uLong ret; |
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97 | ret = (uLong)fread(buf, 1, (size_t)size, (FILE *)stream); |
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98 | return ret; |
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99 | } |
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100 | |
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101 | |
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102 | uLong ZCALLBACK fwrite_file_func (opaque, stream, buf, size) |
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103 | voidpf opaque; |
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104 | voidpf stream; |
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105 | const void* buf; |
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106 | uLong size; |
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107 | { |
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108 | uLong ret; |
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109 | ret = (uLong)fwrite(buf, 1, (size_t)size, (FILE *)stream); |
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110 | return ret; |
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111 | } |
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112 | |
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113 | long ZCALLBACK ftell_file_func (opaque, stream) |
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114 | voidpf opaque; |
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115 | voidpf stream; |
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116 | { |
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117 | long ret; |
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118 | ret = ftell((FILE *)stream); |
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119 | return ret; |
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120 | } |
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121 | |
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122 | long ZCALLBACK fseek_file_func (opaque, stream, offset, origin) |
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123 | voidpf opaque; |
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124 | voidpf stream; |
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125 | uLong offset; |
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126 | int origin; |
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127 | { |
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128 | int fseek_origin=0; |
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129 | long ret; |
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130 | switch (origin) |
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131 | { |
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132 | case ZLIB_FILEFUNC_SEEK_CUR : |
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133 | fseek_origin = SEEK_CUR; |
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134 | break; |
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135 | case ZLIB_FILEFUNC_SEEK_END : |
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136 | fseek_origin = SEEK_END; |
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137 | break; |
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138 | case ZLIB_FILEFUNC_SEEK_SET : |
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139 | fseek_origin = SEEK_SET; |
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140 | break; |
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141 | default: return -1; |
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142 | } |
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143 | ret = 0; |
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144 | fseek((FILE *)stream, offset, fseek_origin); |
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145 | return ret; |
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146 | } |
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147 | |
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148 | int ZCALLBACK fclose_file_func (opaque, stream) |
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149 | voidpf opaque; |
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150 | voidpf stream; |
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151 | { |
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152 | int ret; |
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153 | ret = fclose((FILE *)stream); |
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154 | return ret; |
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155 | } |
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156 | |
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157 | int ZCALLBACK ferror_file_func (opaque, stream) |
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158 | voidpf opaque; |
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159 | voidpf stream; |
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160 | { |
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161 | int ret; |
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162 | ret = ferror((FILE *)stream); |
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163 | return ret; |
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164 | } |
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165 | |
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166 | void fill_fopen_filefunc (pzlib_filefunc_def) |
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167 | zlib_filefunc_def* pzlib_filefunc_def; |
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168 | { |
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169 | pzlib_filefunc_def->zopen_file = fopen_file_func; |
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170 | pzlib_filefunc_def->zread_file = fread_file_func; |
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171 | pzlib_filefunc_def->zwrite_file = fwrite_file_func; |
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172 | pzlib_filefunc_def->ztell_file = ftell_file_func; |
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173 | pzlib_filefunc_def->zseek_file = fseek_file_func; |
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174 | pzlib_filefunc_def->zclose_file = fclose_file_func; |
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175 | pzlib_filefunc_def->zerror_file = ferror_file_func; |
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176 | pzlib_filefunc_def->opaque = NULL; |
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177 | } |
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