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1896 | serge | 1 | /* zutil.c -- target dependent utility functions for the compression library |
2 | * Copyright (C) 1995-2005, 2010 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 | |||
10 | #ifndef NO_DUMMY_DECL |
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11 | struct internal_state {int dummy;}; /* for buggy compilers */ |
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12 | #endif |
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13 | |||
14 | const char * const z_errmsg[10] = { |
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15 | "need dictionary", /* Z_NEED_DICT 2 */ |
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16 | "stream end", /* Z_STREAM_END 1 */ |
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17 | "", /* Z_OK 0 */ |
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18 | "file error", /* Z_ERRNO (-1) */ |
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19 | "stream error", /* Z_STREAM_ERROR (-2) */ |
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20 | "data error", /* Z_DATA_ERROR (-3) */ |
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21 | "insufficient memory", /* Z_MEM_ERROR (-4) */ |
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22 | "buffer error", /* Z_BUF_ERROR (-5) */ |
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23 | "incompatible version",/* Z_VERSION_ERROR (-6) */ |
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24 | ""}; |
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25 | |||
26 | |||
27 | const char * ZEXPORT zlibVersion() |
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28 | { |
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29 | return ZLIB_VERSION; |
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30 | } |
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31 | |||
32 | uLong ZEXPORT zlibCompileFlags() |
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33 | { |
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34 | uLong flags; |
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35 | |||
36 | flags = 0; |
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37 | switch ((int)(sizeof(uInt))) { |
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38 | case 2: break; |
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39 | case 4: flags += 1; break; |
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40 | case 8: flags += 2; break; |
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41 | default: flags += 3; |
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42 | } |
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43 | switch ((int)(sizeof(uLong))) { |
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44 | case 2: break; |
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45 | case 4: flags += 1 << 2; break; |
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46 | case 8: flags += 2 << 2; break; |
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47 | default: flags += 3 << 2; |
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48 | } |
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49 | switch ((int)(sizeof(voidpf))) { |
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50 | case 2: break; |
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51 | case 4: flags += 1 << 4; break; |
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52 | case 8: flags += 2 << 4; break; |
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53 | default: flags += 3 << 4; |
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54 | } |
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55 | switch ((int)(sizeof(z_off_t))) { |
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56 | case 2: break; |
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57 | case 4: flags += 1 << 6; break; |
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58 | case 8: flags += 2 << 6; break; |
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59 | default: flags += 3 << 6; |
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60 | } |
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61 | #ifdef DEBUG |
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62 | flags += 1 << 8; |
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63 | #endif |
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64 | #if defined(ASMV) || defined(ASMINF) |
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65 | flags += 1 << 9; |
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66 | #endif |
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67 | #ifdef ZLIB_WINAPI |
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68 | flags += 1 << 10; |
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69 | #endif |
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70 | #ifdef BUILDFIXED |
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71 | flags += 1 << 12; |
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72 | #endif |
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73 | #ifdef DYNAMIC_CRC_TABLE |
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74 | flags += 1 << 13; |
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75 | #endif |
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76 | #ifdef NO_GZCOMPRESS |
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77 | flags += 1L << 16; |
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78 | #endif |
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79 | #ifdef NO_GZIP |
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80 | flags += 1L << 17; |
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81 | #endif |
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82 | #ifdef PKZIP_BUG_WORKAROUND |
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83 | flags += 1L << 20; |
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84 | #endif |
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85 | #ifdef FASTEST |
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86 | flags += 1L << 21; |
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87 | #endif |
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88 | #ifdef STDC |
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89 | # ifdef NO_vsnprintf |
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90 | flags += 1L << 25; |
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91 | # ifdef HAS_vsprintf_void |
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92 | flags += 1L << 26; |
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93 | # endif |
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94 | # else |
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95 | # ifdef HAS_vsnprintf_void |
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96 | flags += 1L << 26; |
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97 | # endif |
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98 | # endif |
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99 | #else |
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100 | flags += 1L << 24; |
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101 | # ifdef NO_snprintf |
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102 | flags += 1L << 25; |
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103 | # ifdef HAS_sprintf_void |
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104 | flags += 1L << 26; |
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105 | # endif |
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106 | # else |
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107 | # ifdef HAS_snprintf_void |
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108 | flags += 1L << 26; |
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109 | # endif |
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110 | # endif |
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111 | #endif |
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112 | return flags; |
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113 | } |
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114 | |||
115 | #ifdef DEBUG |
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116 | |||
117 | # ifndef verbose |
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118 | # define verbose 0 |
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119 | # endif |
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120 | int ZLIB_INTERNAL z_verbose = verbose; |
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121 | |||
122 | void ZLIB_INTERNAL z_error (m) |
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123 | char *m; |
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124 | { |
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125 | fprintf(stderr, "%s\n", m); |
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126 | exit(1); |
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127 | } |
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128 | #endif |
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129 | |||
130 | /* exported to allow conversion of error code to string for compress() and |
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131 | * uncompress() |
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132 | */ |
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133 | const char * ZEXPORT zError(err) |
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134 | int err; |
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135 | { |
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136 | return ERR_MSG(err); |
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137 | } |
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138 | |||
139 | #if defined(_WIN32_WCE) |
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140 | /* The Microsoft C Run-Time Library for Windows CE doesn't have |
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141 | * errno. We define it as a global variable to simplify porting. |
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142 | * Its value is always 0 and should not be used. |
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143 | */ |
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144 | int errno = 0; |
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145 | #endif |
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146 | |||
147 | #ifndef HAVE_MEMCPY |
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148 | |||
149 | void ZLIB_INTERNAL zmemcpy(dest, source, len) |
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150 | Bytef* dest; |
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151 | const Bytef* source; |
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152 | uInt len; |
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153 | { |
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154 | if (len == 0) return; |
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155 | do { |
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156 | *dest++ = *source++; /* ??? to be unrolled */ |
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157 | } while (--len != 0); |
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158 | } |
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159 | |||
160 | int ZLIB_INTERNAL zmemcmp(s1, s2, len) |
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161 | const Bytef* s1; |
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162 | const Bytef* s2; |
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163 | uInt len; |
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164 | { |
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165 | uInt j; |
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166 | |||
167 | for (j = 0; j < len; j++) { |
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168 | if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; |
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169 | } |
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170 | return 0; |
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171 | } |
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172 | |||
173 | void ZLIB_INTERNAL zmemzero(dest, len) |
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174 | Bytef* dest; |
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175 | uInt len; |
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176 | { |
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177 | if (len == 0) return; |
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178 | do { |
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179 | *dest++ = 0; /* ??? to be unrolled */ |
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180 | } while (--len != 0); |
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181 | } |
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182 | #endif |
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183 | |||
184 | |||
185 | #ifdef SYS16BIT |
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186 | |||
187 | #ifdef __TURBOC__ |
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188 | /* Turbo C in 16-bit mode */ |
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189 | |||
190 | # define MY_ZCALLOC |
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191 | |||
192 | /* Turbo C malloc() does not allow dynamic allocation of 64K bytes |
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193 | * and farmalloc(64K) returns a pointer with an offset of 8, so we |
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194 | * must fix the pointer. Warning: the pointer must be put back to its |
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195 | * original form in order to free it, use zcfree(). |
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196 | */ |
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197 | |||
198 | #define MAX_PTR 10 |
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199 | /* 10*64K = 640K */ |
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200 | |||
201 | local int next_ptr = 0; |
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202 | |||
203 | typedef struct ptr_table_s { |
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204 | voidpf org_ptr; |
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205 | voidpf new_ptr; |
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206 | } ptr_table; |
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207 | |||
208 | local ptr_table table[MAX_PTR]; |
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209 | /* This table is used to remember the original form of pointers |
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210 | * to large buffers (64K). Such pointers are normalized with a zero offset. |
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211 | * Since MSDOS is not a preemptive multitasking OS, this table is not |
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212 | * protected from concurrent access. This hack doesn't work anyway on |
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213 | * a protected system like OS/2. Use Microsoft C instead. |
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214 | */ |
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215 | |||
216 | voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size) |
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217 | { |
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218 | voidpf buf = opaque; /* just to make some compilers happy */ |
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219 | ulg bsize = (ulg)items*size; |
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220 | |||
221 | /* If we allocate less than 65520 bytes, we assume that farmalloc |
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222 | * will return a usable pointer which doesn't have to be normalized. |
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223 | */ |
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224 | if (bsize < 65520L) { |
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225 | buf = farmalloc(bsize); |
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226 | if (*(ush*)&buf != 0) return buf; |
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227 | } else { |
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228 | buf = farmalloc(bsize + 16L); |
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229 | } |
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230 | if (buf == NULL || next_ptr >= MAX_PTR) return NULL; |
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231 | table[next_ptr].org_ptr = buf; |
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232 | |||
233 | /* Normalize the pointer to seg:0 */ |
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234 | *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; |
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235 | *(ush*)&buf = 0; |
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236 | table[next_ptr++].new_ptr = buf; |
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237 | return buf; |
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238 | } |
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239 | |||
240 | void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr) |
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241 | { |
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242 | int n; |
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243 | if (*(ush*)&ptr != 0) { /* object < 64K */ |
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244 | farfree(ptr); |
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245 | return; |
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246 | } |
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247 | /* Find the original pointer */ |
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248 | for (n = 0; n < next_ptr; n++) { |
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249 | if (ptr != table[n].new_ptr) continue; |
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250 | |||
251 | farfree(table[n].org_ptr); |
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252 | while (++n < next_ptr) { |
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253 | table[n-1] = table[n]; |
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254 | } |
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255 | next_ptr--; |
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256 | return; |
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257 | } |
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258 | ptr = opaque; /* just to make some compilers happy */ |
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259 | Assert(0, "zcfree: ptr not found"); |
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260 | } |
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261 | |||
262 | #endif /* __TURBOC__ */ |
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263 | |||
264 | |||
265 | #ifdef M_I86 |
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266 | /* Microsoft C in 16-bit mode */ |
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267 | |||
268 | # define MY_ZCALLOC |
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269 | |||
270 | #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) |
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271 | # define _halloc halloc |
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272 | # define _hfree hfree |
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273 | #endif |
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274 | |||
275 | voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size) |
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276 | { |
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277 | if (opaque) opaque = 0; /* to make compiler happy */ |
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278 | return _halloc((long)items, size); |
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279 | } |
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280 | |||
281 | void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr) |
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282 | { |
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283 | if (opaque) opaque = 0; /* to make compiler happy */ |
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284 | _hfree(ptr); |
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285 | } |
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286 | |||
287 | #endif /* M_I86 */ |
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288 | |||
289 | #endif /* SYS16BIT */ |
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290 | |||
291 | |||
292 | #ifndef MY_ZCALLOC /* Any system without a special alloc function */ |
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293 | |||
294 | #ifndef STDC |
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295 | extern voidp malloc OF((uInt size)); |
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296 | extern voidp calloc OF((uInt items, uInt size)); |
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297 | extern void free OF((voidpf ptr)); |
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298 | #endif |
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299 | |||
300 | voidpf ZLIB_INTERNAL zcalloc (opaque, items, size) |
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301 | voidpf opaque; |
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302 | unsigned items; |
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303 | unsigned size; |
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304 | { |
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305 | if (opaque) items += size - size; /* make compiler happy */ |
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306 | return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : |
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307 | (voidpf)calloc(items, size); |
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308 | } |
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309 | |||
310 | void ZLIB_INTERNAL zcfree (opaque, ptr) |
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311 | voidpf opaque; |
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312 | voidpf ptr; |
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313 | { |
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314 | free(ptr); |
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315 | if (opaque) return; /* make compiler happy */ |
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316 | } |
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317 | |||
318 | #endif /* MY_ZCALLOC */=>>>>>>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><> |