1 | /* zutil.c -- target dependent utility functions for the compression library |
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2 | * Copyright (C) 1995-2002 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: zutil.c,v 1.1.1.2 2002-03-12 17:19:03 zacheiss Exp $ */ |
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7 | |
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8 | #include "zutil.h" |
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9 | |
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10 | struct internal_state {int dummy;}; /* for buggy compilers */ |
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11 | |
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12 | #ifndef STDC |
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13 | extern void exit OF((int)); |
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14 | #endif |
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15 | |
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16 | const char *z_errmsg[10] = { |
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17 | "need dictionary", /* Z_NEED_DICT 2 */ |
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18 | "stream end", /* Z_STREAM_END 1 */ |
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19 | "", /* Z_OK 0 */ |
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20 | "file error", /* Z_ERRNO (-1) */ |
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21 | "stream error", /* Z_STREAM_ERROR (-2) */ |
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22 | "data error", /* Z_DATA_ERROR (-3) */ |
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23 | "insufficient memory", /* Z_MEM_ERROR (-4) */ |
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24 | "buffer error", /* Z_BUF_ERROR (-5) */ |
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25 | "incompatible version",/* Z_VERSION_ERROR (-6) */ |
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26 | ""}; |
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27 | |
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28 | |
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29 | const char * ZEXPORT zlibVersion() |
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30 | { |
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31 | return ZLIB_VERSION; |
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32 | } |
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33 | |
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34 | #ifdef DEBUG |
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35 | |
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36 | # ifndef verbose |
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37 | # define verbose 0 |
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38 | # endif |
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39 | int z_verbose = verbose; |
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40 | |
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41 | void z_error (m) |
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42 | char *m; |
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43 | { |
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44 | fprintf(stderr, "%s\n", m); |
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45 | exit(1); |
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46 | } |
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47 | #endif |
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48 | |
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49 | /* exported to allow conversion of error code to string for compress() and |
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50 | * uncompress() |
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51 | */ |
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52 | const char * ZEXPORT zError(err) |
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53 | int err; |
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54 | { |
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55 | return ERR_MSG(err); |
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56 | } |
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57 | |
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58 | |
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59 | #ifndef HAVE_MEMCPY |
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60 | |
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61 | void zmemcpy(dest, source, len) |
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62 | Bytef* dest; |
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63 | const Bytef* source; |
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64 | uInt len; |
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65 | { |
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66 | if (len == 0) return; |
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67 | do { |
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68 | *dest++ = *source++; /* ??? to be unrolled */ |
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69 | } while (--len != 0); |
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70 | } |
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71 | |
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72 | int zmemcmp(s1, s2, len) |
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73 | const Bytef* s1; |
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74 | const Bytef* s2; |
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75 | uInt len; |
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76 | { |
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77 | uInt j; |
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78 | |
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79 | for (j = 0; j < len; j++) { |
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80 | if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; |
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81 | } |
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82 | return 0; |
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83 | } |
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84 | |
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85 | void zmemzero(dest, len) |
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86 | Bytef* dest; |
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87 | uInt len; |
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88 | { |
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89 | if (len == 0) return; |
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90 | do { |
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91 | *dest++ = 0; /* ??? to be unrolled */ |
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92 | } while (--len != 0); |
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93 | } |
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94 | #endif |
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95 | |
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96 | #ifdef __TURBOC__ |
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97 | #if (defined( __BORLANDC__) || !defined(SMALL_MEDIUM)) && !defined(__32BIT__) |
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98 | /* Small and medium model in Turbo C are for now limited to near allocation |
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99 | * with reduced MAX_WBITS and MAX_MEM_LEVEL |
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100 | */ |
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101 | # define MY_ZCALLOC |
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102 | |
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103 | /* Turbo C malloc() does not allow dynamic allocation of 64K bytes |
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104 | * and farmalloc(64K) returns a pointer with an offset of 8, so we |
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105 | * must fix the pointer. Warning: the pointer must be put back to its |
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106 | * original form in order to free it, use zcfree(). |
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107 | */ |
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108 | |
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109 | #define MAX_PTR 10 |
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110 | /* 10*64K = 640K */ |
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111 | |
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112 | local int next_ptr = 0; |
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113 | |
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114 | typedef struct ptr_table_s { |
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115 | voidpf org_ptr; |
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116 | voidpf new_ptr; |
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117 | } ptr_table; |
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118 | |
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119 | local ptr_table table[MAX_PTR]; |
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120 | /* This table is used to remember the original form of pointers |
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121 | * to large buffers (64K). Such pointers are normalized with a zero offset. |
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122 | * Since MSDOS is not a preemptive multitasking OS, this table is not |
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123 | * protected from concurrent access. This hack doesn't work anyway on |
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124 | * a protected system like OS/2. Use Microsoft C instead. |
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125 | */ |
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126 | |
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127 | voidpf zcalloc (voidpf opaque, unsigned items, unsigned size) |
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128 | { |
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129 | voidpf buf = opaque; /* just to make some compilers happy */ |
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130 | ulg bsize = (ulg)items*size; |
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131 | |
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132 | /* If we allocate less than 65520 bytes, we assume that farmalloc |
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133 | * will return a usable pointer which doesn't have to be normalized. |
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134 | */ |
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135 | if (bsize < 65520L) { |
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136 | buf = farmalloc(bsize); |
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137 | if (*(ush*)&buf != 0) return buf; |
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138 | } else { |
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139 | buf = farmalloc(bsize + 16L); |
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140 | } |
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141 | if (buf == NULL || next_ptr >= MAX_PTR) return NULL; |
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142 | table[next_ptr].org_ptr = buf; |
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143 | |
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144 | /* Normalize the pointer to seg:0 */ |
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145 | *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; |
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146 | *(ush*)&buf = 0; |
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147 | table[next_ptr++].new_ptr = buf; |
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148 | return buf; |
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149 | } |
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150 | |
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151 | void zcfree (voidpf opaque, voidpf ptr) |
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152 | { |
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153 | int n; |
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154 | if (*(ush*)&ptr != 0) { /* object < 64K */ |
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155 | farfree(ptr); |
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156 | return; |
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157 | } |
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158 | /* Find the original pointer */ |
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159 | for (n = 0; n < next_ptr; n++) { |
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160 | if (ptr != table[n].new_ptr) continue; |
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161 | |
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162 | farfree(table[n].org_ptr); |
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163 | while (++n < next_ptr) { |
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164 | table[n-1] = table[n]; |
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165 | } |
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166 | next_ptr--; |
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167 | return; |
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168 | } |
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169 | ptr = opaque; /* just to make some compilers happy */ |
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170 | Assert(0, "zcfree: ptr not found"); |
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171 | } |
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172 | #endif |
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173 | #endif /* __TURBOC__ */ |
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174 | |
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175 | |
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176 | #if defined(M_I86) && !defined(__32BIT__) |
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177 | /* Microsoft C in 16-bit mode */ |
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178 | |
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179 | # define MY_ZCALLOC |
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180 | |
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181 | #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) |
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182 | # define _halloc halloc |
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183 | # define _hfree hfree |
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184 | #endif |
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185 | |
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186 | voidpf zcalloc (voidpf opaque, unsigned items, unsigned size) |
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187 | { |
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188 | if (opaque) opaque = 0; /* to make compiler happy */ |
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189 | return _halloc((long)items, size); |
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190 | } |
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191 | |
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192 | void zcfree (voidpf opaque, voidpf ptr) |
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193 | { |
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194 | if (opaque) opaque = 0; /* to make compiler happy */ |
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195 | _hfree(ptr); |
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196 | } |
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197 | |
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198 | #endif /* MSC */ |
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199 | |
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200 | |
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201 | #ifndef MY_ZCALLOC /* Any system without a special alloc function */ |
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202 | |
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203 | #ifndef STDC |
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204 | extern voidp calloc OF((uInt items, uInt size)); |
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205 | extern void free OF((voidpf ptr)); |
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206 | #endif |
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207 | |
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208 | voidpf zcalloc (opaque, items, size) |
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209 | voidpf opaque; |
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210 | unsigned items; |
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211 | unsigned size; |
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212 | { |
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213 | if (opaque) items += size - size; /* make compiler happy */ |
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214 | return (voidpf)calloc(items, size); |
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215 | } |
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216 | |
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217 | void zcfree (opaque, ptr) |
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218 | voidpf opaque; |
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219 | voidpf ptr; |
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220 | { |
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221 | free(ptr); |
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222 | if (opaque) return; /* make compiler happy */ |
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223 | } |
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224 | |
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225 | #endif /* MY_ZCALLOC */ |
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