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Add zlib LICENSE file to zlib subdir
author Michael Pavone <pavone@retrodev.com>
date Sun, 15 Jun 2025 15:41:38 -0700
parents 9ef72ee5c0b0
children
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1 /* zutil.c -- target dependent utility functions for the compression library
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2 * Copyright (C) 1995-2017 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
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6 /* @(#) $Id$ */
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7
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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
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13 z_const char * const z_errmsg[10] = {
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14 (z_const char *)"need dictionary", /* Z_NEED_DICT 2 */
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15 (z_const char *)"stream end", /* Z_STREAM_END 1 */
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16 (z_const char *)"", /* Z_OK 0 */
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17 (z_const char *)"file error", /* Z_ERRNO (-1) */
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18 (z_const char *)"stream error", /* Z_STREAM_ERROR (-2) */
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19 (z_const char *)"data error", /* Z_DATA_ERROR (-3) */
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20 (z_const char *)"insufficient memory", /* Z_MEM_ERROR (-4) */
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21 (z_const char *)"buffer error", /* Z_BUF_ERROR (-5) */
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22 (z_const char *)"incompatible version",/* Z_VERSION_ERROR (-6) */
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23 (z_const char *)""
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24 };
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25
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26
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27 const char * ZEXPORT zlibVersion(void) {
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28 return ZLIB_VERSION;
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29 }
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30
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31 uLong ZEXPORT zlibCompileFlags(void) {
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32 uLong flags;
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33
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34 flags = 0;
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35 switch ((int)(sizeof(uInt))) {
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36 case 2: break;
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37 case 4: flags += 1; break;
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38 case 8: flags += 2; break;
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39 default: flags += 3;
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40 }
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41 switch ((int)(sizeof(uLong))) {
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42 case 2: break;
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43 case 4: flags += 1 << 2; break;
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44 case 8: flags += 2 << 2; break;
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45 default: flags += 3 << 2;
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46 }
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47 switch ((int)(sizeof(voidpf))) {
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48 case 2: break;
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49 case 4: flags += 1 << 4; break;
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50 case 8: flags += 2 << 4; break;
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51 default: flags += 3 << 4;
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52 }
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53 switch ((int)(sizeof(z_off_t))) {
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54 case 2: break;
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55 case 4: flags += 1 << 6; break;
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56 case 8: flags += 2 << 6; break;
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57 default: flags += 3 << 6;
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58 }
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59 #ifdef ZLIB_DEBUG
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60 flags += 1 << 8;
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61 #endif
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62 /*
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63 #if defined(ASMV) || defined(ASMINF)
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64 flags += 1 << 9;
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65 #endif
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66 */
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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 #if defined(STDC) || defined(Z_HAVE_STDARG_H)
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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
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115 #ifdef ZLIB_DEBUG
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116 #include <stdlib.h>
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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
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122 void ZLIB_INTERNAL z_error(char *m) {
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123 fprintf(stderr, "%s\n", m);
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124 exit(1);
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125 }
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126 #endif
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127
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128 /* exported to allow conversion of error code to string for compress() and
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129 * uncompress()
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130 */
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131 const char * ZEXPORT zError(int err) {
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132 return ERR_MSG(err);
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133 }
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134
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135 #if defined(_WIN32_WCE) && _WIN32_WCE < 0x800
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136 /* The older Microsoft C Run-Time Library for Windows CE doesn't have
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137 * errno. We define it as a global variable to simplify porting.
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138 * Its value is always 0 and should not be used.
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139 */
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140 int errno = 0;
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141 #endif
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142
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143 #ifndef HAVE_MEMCPY
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144
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145 void ZLIB_INTERNAL zmemcpy(Bytef* dest, const Bytef* source, uInt len) {
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146 if (len == 0) return;
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147 do {
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148 *dest++ = *source++; /* ??? to be unrolled */
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149 } while (--len != 0);
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150 }
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151
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152 int ZLIB_INTERNAL zmemcmp(const Bytef* s1, const Bytef* s2, uInt len) {
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153 uInt j;
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154
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155 for (j = 0; j < len; j++) {
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156 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
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157 }
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158 return 0;
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159 }
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160
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161 void ZLIB_INTERNAL zmemzero(Bytef* dest, uInt len) {
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162 if (len == 0) return;
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163 do {
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164 *dest++ = 0; /* ??? to be unrolled */
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165 } while (--len != 0);
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166 }
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167 #endif
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168
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169 #ifndef Z_SOLO
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170
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171 #ifdef SYS16BIT
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172
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173 #ifdef __TURBOC__
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174 /* Turbo C in 16-bit mode */
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175
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176 # define MY_ZCALLOC
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177
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178 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
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179 * and farmalloc(64K) returns a pointer with an offset of 8, so we
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180 * must fix the pointer. Warning: the pointer must be put back to its
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181 * original form in order to free it, use zcfree().
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182 */
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183
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184 #define MAX_PTR 10
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185 /* 10*64K = 640K */
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186
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187 local int next_ptr = 0;
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188
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189 typedef struct ptr_table_s {
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190 voidpf org_ptr;
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191 voidpf new_ptr;
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192 } ptr_table;
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193
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194 local ptr_table table[MAX_PTR];
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195 /* This table is used to remember the original form of pointers
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196 * to large buffers (64K). Such pointers are normalized with a zero offset.
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197 * Since MSDOS is not a preemptive multitasking OS, this table is not
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198 * protected from concurrent access. This hack doesn't work anyway on
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199 * a protected system like OS/2. Use Microsoft C instead.
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200 */
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201
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202 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) {
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203 voidpf buf;
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204 ulg bsize = (ulg)items*size;
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205
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206 (void)opaque;
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207
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208 /* If we allocate less than 65520 bytes, we assume that farmalloc
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209 * will return a usable pointer which doesn't have to be normalized.
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210 */
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211 if (bsize < 65520L) {
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212 buf = farmalloc(bsize);
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213 if (*(ush*)&buf != 0) return buf;
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214 } else {
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215 buf = farmalloc(bsize + 16L);
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216 }
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217 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
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218 table[next_ptr].org_ptr = buf;
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219
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220 /* Normalize the pointer to seg:0 */
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221 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
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222 *(ush*)&buf = 0;
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223 table[next_ptr++].new_ptr = buf;
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224 return buf;
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225 }
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226
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227 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) {
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228 int n;
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229
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230 (void)opaque;
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231
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232 if (*(ush*)&ptr != 0) { /* object < 64K */
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233 farfree(ptr);
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234 return;
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235 }
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236 /* Find the original pointer */
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237 for (n = 0; n < next_ptr; n++) {
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238 if (ptr != table[n].new_ptr) continue;
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239
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240 farfree(table[n].org_ptr);
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241 while (++n < next_ptr) {
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242 table[n-1] = table[n];
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243 }
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244 next_ptr--;
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245 return;
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246 }
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247 Assert(0, "zcfree: ptr not found");
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248 }
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249
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250 #endif /* __TURBOC__ */
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251
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252
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253 #ifdef M_I86
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254 /* Microsoft C in 16-bit mode */
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255
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256 # define MY_ZCALLOC
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257
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258 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
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259 # define _halloc halloc
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260 # define _hfree hfree
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261 #endif
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262
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263 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, uInt items, uInt size) {
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264 (void)opaque;
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265 return _halloc((long)items, size);
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266 }
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267
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268 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) {
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269 (void)opaque;
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270 _hfree(ptr);
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271 }
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272
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273 #endif /* M_I86 */
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274
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275 #endif /* SYS16BIT */
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276
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277
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278 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
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279
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280 #ifndef STDC
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281 extern voidp malloc(uInt size);
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282 extern voidp calloc(uInt items, uInt size);
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283 extern void free(voidpf ptr);
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284 #endif
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285
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286 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) {
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287 (void)opaque;
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288 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
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289 (voidpf)calloc(items, size);
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290 }
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291
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292 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) {
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293 (void)opaque;
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294 free(ptr);
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295 }
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296
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297 #endif /* MY_ZCALLOC */
00d788dac91a Added support for reading gzipped ROMs
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298
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
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299 #endif /* !Z_SOLO */