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Rev | Author | Line No. | Line |
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4349 | Serge | 1 | /* zutil.c -- target dependent utility functions for the compression library |
2 | * Copyright (C) 1995-2005, 2010, 2011, 2012 Jean-loup Gailly. |
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3 | * For conditions of distribution and use, see copyright notice in zlib.h |
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4 | */ |
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5 | |||
6 | /* @(#) $Id$ */ |
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7 | |||
8 | #include "zutil.h" |
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9 | #ifndef Z_SOLO |
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10 | # include "gzguts.h" |
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11 | #endif |
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12 | |||
13 | #ifndef NO_DUMMY_DECL |
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14 | struct internal_state {int dummy;}; /* for buggy compilers */ |
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15 | #endif |
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16 | |||
17 | z_const char * const z_errmsg[10] = { |
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18 | "need dictionary", /* Z_NEED_DICT 2 */ |
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19 | "stream end", /* Z_STREAM_END 1 */ |
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20 | "", /* Z_OK 0 */ |
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21 | "file error", /* Z_ERRNO (-1) */ |
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22 | "stream error", /* Z_STREAM_ERROR (-2) */ |
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23 | "data error", /* Z_DATA_ERROR (-3) */ |
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24 | "insufficient memory", /* Z_MEM_ERROR (-4) */ |
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25 | "buffer error", /* Z_BUF_ERROR (-5) */ |
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26 | "incompatible version",/* Z_VERSION_ERROR (-6) */ |
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27 | ""}; |
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28 | |||
29 | |||
30 | const char * ZEXPORT zlibVersion() |
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31 | { |
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32 | return ZLIB_VERSION; |
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33 | } |
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34 | |||
35 | uLong ZEXPORT zlibCompileFlags() |
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36 | { |
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37 | uLong flags; |
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38 | |||
39 | flags = 0; |
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40 | switch ((int)(sizeof(uInt))) { |
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41 | case 2: break; |
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42 | case 4: flags += 1; break; |
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43 | case 8: flags += 2; break; |
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44 | default: flags += 3; |
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45 | } |
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46 | switch ((int)(sizeof(uLong))) { |
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47 | case 2: break; |
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48 | case 4: flags += 1 << 2; break; |
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49 | case 8: flags += 2 << 2; break; |
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50 | default: flags += 3 << 2; |
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51 | } |
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52 | switch ((int)(sizeof(voidpf))) { |
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53 | case 2: break; |
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54 | case 4: flags += 1 << 4; break; |
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55 | case 8: flags += 2 << 4; break; |
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56 | default: flags += 3 << 4; |
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57 | } |
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58 | switch ((int)(sizeof(z_off_t))) { |
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59 | case 2: break; |
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60 | case 4: flags += 1 << 6; break; |
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61 | case 8: flags += 2 << 6; break; |
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62 | default: flags += 3 << 6; |
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63 | } |
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64 | #ifdef DEBUG |
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65 | flags += 1 << 8; |
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66 | #endif |
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67 | #if defined(ASMV) || defined(ASMINF) |
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68 | flags += 1 << 9; |
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69 | #endif |
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70 | #ifdef ZLIB_WINAPI |
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71 | flags += 1 << 10; |
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72 | #endif |
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73 | #ifdef BUILDFIXED |
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74 | flags += 1 << 12; |
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75 | #endif |
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76 | #ifdef DYNAMIC_CRC_TABLE |
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77 | flags += 1 << 13; |
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78 | #endif |
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79 | #ifdef NO_GZCOMPRESS |
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80 | flags += 1L << 16; |
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81 | #endif |
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82 | #ifdef NO_GZIP |
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83 | flags += 1L << 17; |
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84 | #endif |
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85 | #ifdef PKZIP_BUG_WORKAROUND |
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86 | flags += 1L << 20; |
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87 | #endif |
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88 | #ifdef FASTEST |
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89 | flags += 1L << 21; |
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90 | #endif |
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91 | #if defined(STDC) || defined(Z_HAVE_STDARG_H) |
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92 | # ifdef NO_vsnprintf |
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93 | flags += 1L << 25; |
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94 | # ifdef HAS_vsprintf_void |
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95 | flags += 1L << 26; |
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96 | # endif |
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97 | # else |
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98 | # ifdef HAS_vsnprintf_void |
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99 | flags += 1L << 26; |
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100 | # endif |
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101 | # endif |
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102 | #else |
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103 | flags += 1L << 24; |
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104 | # ifdef NO_snprintf |
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105 | flags += 1L << 25; |
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106 | # ifdef HAS_sprintf_void |
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107 | flags += 1L << 26; |
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108 | # endif |
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109 | # else |
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110 | # ifdef HAS_snprintf_void |
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111 | flags += 1L << 26; |
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112 | # endif |
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113 | # endif |
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114 | #endif |
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115 | return flags; |
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116 | } |
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117 | |||
118 | #ifdef DEBUG |
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119 | |||
120 | # ifndef verbose |
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121 | # define verbose 0 |
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122 | # endif |
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123 | int ZLIB_INTERNAL z_verbose = verbose; |
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124 | |||
125 | void ZLIB_INTERNAL z_error (m) |
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126 | char *m; |
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127 | { |
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128 | fprintf(stderr, "%s\n", m); |
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129 | exit(1); |
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130 | } |
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131 | #endif |
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132 | |||
133 | /* exported to allow conversion of error code to string for compress() and |
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134 | * uncompress() |
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135 | */ |
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136 | const char * ZEXPORT zError(err) |
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137 | int err; |
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138 | { |
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139 | return ERR_MSG(err); |
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140 | } |
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141 | |||
142 | #if defined(_WIN32_WCE) |
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143 | /* The Microsoft C Run-Time Library for Windows CE doesn't have |
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144 | * errno. We define it as a global variable to simplify porting. |
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145 | * Its value is always 0 and should not be used. |
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146 | */ |
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147 | int errno = 0; |
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148 | #endif |
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149 | |||
150 | #ifndef HAVE_MEMCPY |
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151 | |||
152 | void ZLIB_INTERNAL zmemcpy(dest, source, len) |
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153 | Bytef* dest; |
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154 | const Bytef* source; |
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155 | uInt len; |
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156 | { |
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157 | if (len == 0) return; |
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158 | do { |
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159 | *dest++ = *source++; /* ??? to be unrolled */ |
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160 | } while (--len != 0); |
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161 | } |
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162 | |||
163 | int ZLIB_INTERNAL zmemcmp(s1, s2, len) |
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164 | const Bytef* s1; |
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165 | const Bytef* s2; |
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166 | uInt len; |
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167 | { |
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168 | uInt j; |
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169 | |||
170 | for (j = 0; j < len; j++) { |
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171 | if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; |
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172 | } |
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173 | return 0; |
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174 | } |
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175 | |||
176 | void ZLIB_INTERNAL zmemzero(dest, len) |
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177 | Bytef* dest; |
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178 | uInt len; |
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179 | { |
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180 | if (len == 0) return; |
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181 | do { |
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182 | *dest++ = 0; /* ??? to be unrolled */ |
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183 | } while (--len != 0); |
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184 | } |
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185 | #endif |
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186 | |||
187 | #ifndef Z_SOLO |
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188 | |||
189 | #ifdef SYS16BIT |
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190 | |||
191 | #ifdef __TURBOC__ |
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192 | /* Turbo C in 16-bit mode */ |
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193 | |||
194 | # define MY_ZCALLOC |
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195 | |||
196 | /* Turbo C malloc() does not allow dynamic allocation of 64K bytes |
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197 | * and farmalloc(64K) returns a pointer with an offset of 8, so we |
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198 | * must fix the pointer. Warning: the pointer must be put back to its |
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199 | * original form in order to free it, use zcfree(). |
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200 | */ |
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201 | |||
202 | #define MAX_PTR 10 |
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203 | /* 10*64K = 640K */ |
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204 | |||
205 | local int next_ptr = 0; |
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206 | |||
207 | typedef struct ptr_table_s { |
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208 | voidpf org_ptr; |
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209 | voidpf new_ptr; |
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210 | } ptr_table; |
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211 | |||
212 | local ptr_table table[MAX_PTR]; |
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213 | /* This table is used to remember the original form of pointers |
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214 | * to large buffers (64K). Such pointers are normalized with a zero offset. |
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215 | * Since MSDOS is not a preemptive multitasking OS, this table is not |
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216 | * protected from concurrent access. This hack doesn't work anyway on |
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217 | * a protected system like OS/2. Use Microsoft C instead. |
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218 | */ |
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219 | |||
220 | voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size) |
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221 | { |
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222 | voidpf buf = opaque; /* just to make some compilers happy */ |
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223 | ulg bsize = (ulg)items*size; |
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224 | |||
225 | /* If we allocate less than 65520 bytes, we assume that farmalloc |
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226 | * will return a usable pointer which doesn't have to be normalized. |
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227 | */ |
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228 | if (bsize < 65520L) { |
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229 | buf = farmalloc(bsize); |
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230 | if (*(ush*)&buf != 0) return buf; |
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231 | } else { |
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232 | buf = farmalloc(bsize + 16L); |
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233 | } |
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234 | if (buf == NULL || next_ptr >= MAX_PTR) return NULL; |
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235 | table[next_ptr].org_ptr = buf; |
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236 | |||
237 | /* Normalize the pointer to seg:0 */ |
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238 | *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; |
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239 | *(ush*)&buf = 0; |
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240 | table[next_ptr++].new_ptr = buf; |
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241 | return buf; |
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242 | } |
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243 | |||
244 | void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr) |
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245 | { |
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246 | int n; |
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247 | if (*(ush*)&ptr != 0) { /* object < 64K */ |
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248 | farfree(ptr); |
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249 | return; |
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250 | } |
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251 | /* Find the original pointer */ |
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252 | for (n = 0; n < next_ptr; n++) { |
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253 | if (ptr != table[n].new_ptr) continue; |
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254 | |||
255 | farfree(table[n].org_ptr); |
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256 | while (++n < next_ptr) { |
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257 | table[n-1] = table[n]; |
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258 | } |
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259 | next_ptr--; |
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260 | return; |
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261 | } |
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262 | ptr = opaque; /* just to make some compilers happy */ |
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263 | Assert(0, "zcfree: ptr not found"); |
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264 | } |
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265 | |||
266 | #endif /* __TURBOC__ */ |
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267 | |||
268 | |||
269 | #ifdef M_I86 |
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270 | /* Microsoft C in 16-bit mode */ |
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271 | |||
272 | # define MY_ZCALLOC |
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273 | |||
274 | #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) |
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275 | # define _halloc halloc |
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276 | # define _hfree hfree |
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277 | #endif |
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278 | |||
279 | voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size) |
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280 | { |
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281 | if (opaque) opaque = 0; /* to make compiler happy */ |
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282 | return _halloc((long)items, size); |
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283 | } |
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284 | |||
285 | void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr) |
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286 | { |
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287 | if (opaque) opaque = 0; /* to make compiler happy */ |
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288 | _hfree(ptr); |
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289 | } |
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290 | |||
291 | #endif /* M_I86 */ |
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292 | |||
293 | #endif /* SYS16BIT */ |
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294 | |||
295 | |||
296 | #ifndef MY_ZCALLOC /* Any system without a special alloc function */ |
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297 | |||
298 | #ifndef STDC |
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299 | extern voidp malloc OF((uInt size)); |
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300 | extern voidp calloc OF((uInt items, uInt size)); |
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301 | extern void free OF((voidpf ptr)); |
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302 | #endif |
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303 | |||
304 | voidpf ZLIB_INTERNAL zcalloc (opaque, items, size) |
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305 | voidpf opaque; |
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306 | unsigned items; |
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307 | unsigned size; |
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308 | { |
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309 | if (opaque) items += size - size; /* make compiler happy */ |
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310 | return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : |
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311 | (voidpf)calloc(items, size); |
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312 | } |
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313 | |||
314 | void ZLIB_INTERNAL zcfree (opaque, ptr) |
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315 | voidpf opaque; |
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316 | voidpf ptr; |
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317 | { |
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318 | free(ptr); |
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319 | if (opaque) return; /* make compiler happy */ |
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320 | } |
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321 | |||
322 | #endif /* MY_ZCALLOC */ |
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323 | |||
324 | #endif /* !Z_SOLO */=>>>>>>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><> |