1 /* |
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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3 * |
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4 * This code is free software; you can redistribute it and/or modify it |
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5 * under the terms of the GNU General Public License version 2 only, as |
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6 * published by the Free Software Foundation. Oracle designates this |
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7 * particular file as subject to the "Classpath" exception as provided |
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8 * by Oracle in the LICENSE file that accompanied this code. |
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9 * |
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10 * This code is distributed in the hope that it will be useful, but WITHOUT |
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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13 * version 2 for more details (a copy is included in the LICENSE file that |
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14 * accompanied this code). |
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15 * |
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16 * You should have received a copy of the GNU General Public License version |
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17 * 2 along with this work; if not, write to the Free Software Foundation, |
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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19 * |
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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21 * or visit www.oracle.com if you need additional information or have any |
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22 * questions. |
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23 */ |
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24 |
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25 /* zutil.c -- target dependent utility functions for the compression library |
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26 * Copyright (C) 1995-2005 Jean-loup Gailly. |
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27 * For conditions of distribution and use, see copyright notice in zlib.h |
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28 */ |
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29 |
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30 /* @(#) $Id$ */ |
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31 |
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32 #include "zutil.h" |
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33 |
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34 #ifndef NO_DUMMY_DECL |
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35 struct internal_state {int dummy;}; /* for buggy compilers */ |
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36 #endif |
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37 |
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38 const char * const z_errmsg[10] = { |
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39 "need dictionary", /* Z_NEED_DICT 2 */ |
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40 "stream end", /* Z_STREAM_END 1 */ |
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41 "", /* Z_OK 0 */ |
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42 "file error", /* Z_ERRNO (-1) */ |
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43 "stream error", /* Z_STREAM_ERROR (-2) */ |
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44 "data error", /* Z_DATA_ERROR (-3) */ |
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45 "insufficient memory", /* Z_MEM_ERROR (-4) */ |
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46 "buffer error", /* Z_BUF_ERROR (-5) */ |
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47 "incompatible version",/* Z_VERSION_ERROR (-6) */ |
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48 ""}; |
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49 |
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50 |
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51 const char * ZEXPORT zlibVersion() |
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52 { |
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53 return ZLIB_VERSION; |
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54 } |
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55 |
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56 uLong ZEXPORT zlibCompileFlags() |
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57 { |
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58 uLong flags; |
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59 |
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60 flags = 0; |
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61 switch (sizeof(uInt)) { |
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62 case 2: break; |
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63 case 4: flags += 1; break; |
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64 case 8: flags += 2; break; |
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65 default: flags += 3; |
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66 } |
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67 switch (sizeof(uLong)) { |
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68 case 2: break; |
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69 case 4: flags += 1 << 2; break; |
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70 case 8: flags += 2 << 2; break; |
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71 default: flags += 3 << 2; |
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72 } |
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73 switch (sizeof(voidpf)) { |
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74 case 2: break; |
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75 case 4: flags += 1 << 4; break; |
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76 case 8: flags += 2 << 4; break; |
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77 default: flags += 3 << 4; |
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78 } |
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79 switch (sizeof(z_off_t)) { |
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80 case 2: break; |
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81 case 4: flags += 1 << 6; break; |
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82 case 8: flags += 2 << 6; break; |
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83 default: flags += 3 << 6; |
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84 } |
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85 #ifdef DEBUG |
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86 flags += 1 << 8; |
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87 #endif |
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88 #if defined(ASMV) || defined(ASMINF) |
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89 flags += 1 << 9; |
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90 #endif |
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91 #ifdef ZLIB_WINAPI |
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92 flags += 1 << 10; |
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93 #endif |
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94 #ifdef BUILDFIXED |
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95 flags += 1 << 12; |
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96 #endif |
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97 #ifdef DYNAMIC_CRC_TABLE |
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98 flags += 1 << 13; |
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99 #endif |
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100 #ifdef NO_GZCOMPRESS |
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101 flags += 1L << 16; |
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102 #endif |
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103 #ifdef NO_GZIP |
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104 flags += 1L << 17; |
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105 #endif |
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106 #ifdef PKZIP_BUG_WORKAROUND |
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107 flags += 1L << 20; |
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108 #endif |
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109 #ifdef FASTEST |
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110 flags += 1L << 21; |
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111 #endif |
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112 #ifdef STDC |
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113 # ifdef NO_vsnprintf |
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114 flags += 1L << 25; |
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115 # ifdef HAS_vsprintf_void |
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116 flags += 1L << 26; |
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117 # endif |
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118 # else |
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119 # ifdef HAS_vsnprintf_void |
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120 flags += 1L << 26; |
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121 # endif |
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122 # endif |
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123 #else |
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124 flags += 1L << 24; |
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125 # ifdef NO_snprintf |
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126 flags += 1L << 25; |
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127 # ifdef HAS_sprintf_void |
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128 flags += 1L << 26; |
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129 # endif |
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130 # else |
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131 # ifdef HAS_snprintf_void |
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132 flags += 1L << 26; |
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133 # endif |
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134 # endif |
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135 #endif |
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136 return flags; |
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137 } |
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138 |
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139 #ifdef DEBUG |
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140 |
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141 # ifndef verbose |
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142 # define verbose 0 |
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143 # endif |
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144 int z_verbose = verbose; |
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145 |
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146 void z_error (m) |
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147 char *m; |
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148 { |
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149 fprintf(stderr, "%s\n", m); |
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150 exit(1); |
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151 } |
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152 #endif |
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153 |
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154 /* exported to allow conversion of error code to string for compress() and |
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155 * uncompress() |
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156 */ |
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157 const char * ZEXPORT zError(err) |
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158 int err; |
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159 { |
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160 return ERR_MSG(err); |
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161 } |
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162 |
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163 #if defined(_WIN32_WCE) |
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164 /* The Microsoft C Run-Time Library for Windows CE doesn't have |
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165 * errno. We define it as a global variable to simplify porting. |
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166 * Its value is always 0 and should not be used. |
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167 */ |
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168 int errno = 0; |
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169 #endif |
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170 |
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171 #ifndef HAVE_MEMCPY |
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172 |
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173 void zmemcpy(dest, source, len) |
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174 Bytef* dest; |
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175 const Bytef* source; |
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176 uInt len; |
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177 { |
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178 if (len == 0) return; |
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179 do { |
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180 *dest++ = *source++; /* ??? to be unrolled */ |
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181 } while (--len != 0); |
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182 } |
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183 |
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184 int zmemcmp(s1, s2, len) |
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185 const Bytef* s1; |
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186 const Bytef* s2; |
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187 uInt len; |
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188 { |
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189 uInt j; |
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190 |
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191 for (j = 0; j < len; j++) { |
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192 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; |
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193 } |
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194 return 0; |
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195 } |
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196 |
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197 void zmemzero(dest, len) |
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198 Bytef* dest; |
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199 uInt len; |
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200 { |
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201 if (len == 0) return; |
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202 do { |
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203 *dest++ = 0; /* ??? to be unrolled */ |
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204 } while (--len != 0); |
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205 } |
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206 #endif |
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207 |
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208 |
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209 #ifdef SYS16BIT |
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210 |
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211 #ifdef __TURBOC__ |
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212 /* Turbo C in 16-bit mode */ |
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213 |
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214 # define MY_ZCALLOC |
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215 |
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216 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes |
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217 * and farmalloc(64K) returns a pointer with an offset of 8, so we |
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218 * must fix the pointer. Warning: the pointer must be put back to its |
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219 * original form in order to free it, use zcfree(). |
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220 */ |
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221 |
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222 #define MAX_PTR 10 |
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223 /* 10*64K = 640K */ |
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224 |
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225 local int next_ptr = 0; |
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226 |
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227 typedef struct ptr_table_s { |
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228 voidpf org_ptr; |
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229 voidpf new_ptr; |
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230 } ptr_table; |
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231 |
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232 local ptr_table table[MAX_PTR]; |
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233 /* This table is used to remember the original form of pointers |
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234 * to large buffers (64K). Such pointers are normalized with a zero offset. |
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235 * Since MSDOS is not a preemptive multitasking OS, this table is not |
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236 * protected from concurrent access. This hack doesn't work anyway on |
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237 * a protected system like OS/2. Use Microsoft C instead. |
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238 */ |
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239 |
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240 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size) |
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241 { |
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242 voidpf buf = opaque; /* just to make some compilers happy */ |
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243 ulg bsize = (ulg)items*size; |
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244 |
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245 /* If we allocate less than 65520 bytes, we assume that farmalloc |
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246 * will return a usable pointer which doesn't have to be normalized. |
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247 */ |
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248 if (bsize < 65520L) { |
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249 buf = farmalloc(bsize); |
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250 if (*(ush*)&buf != 0) return buf; |
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251 } else { |
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252 buf = farmalloc(bsize + 16L); |
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253 } |
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254 if (buf == NULL || next_ptr >= MAX_PTR) return NULL; |
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255 table[next_ptr].org_ptr = buf; |
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256 |
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257 /* Normalize the pointer to seg:0 */ |
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258 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; |
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259 *(ush*)&buf = 0; |
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260 table[next_ptr++].new_ptr = buf; |
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261 return buf; |
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262 } |
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263 |
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264 void zcfree (voidpf opaque, voidpf ptr) |
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265 { |
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266 int n; |
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267 if (*(ush*)&ptr != 0) { /* object < 64K */ |
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268 farfree(ptr); |
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269 return; |
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270 } |
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271 /* Find the original pointer */ |
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272 for (n = 0; n < next_ptr; n++) { |
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273 if (ptr != table[n].new_ptr) continue; |
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274 |
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275 farfree(table[n].org_ptr); |
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276 while (++n < next_ptr) { |
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277 table[n-1] = table[n]; |
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278 } |
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279 next_ptr--; |
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280 return; |
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281 } |
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282 ptr = opaque; /* just to make some compilers happy */ |
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283 Assert(0, "zcfree: ptr not found"); |
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284 } |
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285 |
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286 #endif /* __TURBOC__ */ |
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287 |
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288 |
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289 #ifdef M_I86 |
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290 /* Microsoft C in 16-bit mode */ |
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291 |
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292 # define MY_ZCALLOC |
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293 |
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294 #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) |
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295 # define _halloc halloc |
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296 # define _hfree hfree |
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297 #endif |
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298 |
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299 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size) |
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300 { |
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301 if (opaque) opaque = 0; /* to make compiler happy */ |
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302 return _halloc((long)items, size); |
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303 } |
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304 |
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305 void zcfree (voidpf opaque, voidpf ptr) |
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306 { |
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307 if (opaque) opaque = 0; /* to make compiler happy */ |
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308 _hfree(ptr); |
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309 } |
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310 |
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311 #endif /* M_I86 */ |
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312 |
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313 #endif /* SYS16BIT */ |
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314 |
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315 |
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316 #ifndef MY_ZCALLOC /* Any system without a special alloc function */ |
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317 |
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318 #ifndef STDC |
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319 extern voidp malloc OF((uInt size)); |
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320 extern voidp calloc OF((uInt items, uInt size)); |
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321 extern void free OF((voidpf ptr)); |
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322 #endif |
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323 |
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324 voidpf zcalloc (opaque, items, size) |
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325 voidpf opaque; |
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326 unsigned items; |
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327 unsigned size; |
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328 { |
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329 if (opaque) items += size - size; /* make compiler happy */ |
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330 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : |
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331 (voidpf)calloc(items, size); |
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332 } |
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333 |
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334 void zcfree (opaque, ptr) |
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335 voidpf opaque; |
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336 voidpf ptr; |
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337 { |
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338 free(ptr); |
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339 if (opaque) return; /* make compiler happy */ |
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340 } |
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341 |
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342 #endif /* MY_ZCALLOC */ |
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