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3
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1 /* zutil.c -- target dependent utility functions for the compression library
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2 * Copyright (C) 1995 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 1.1.1.1 1997/12/06 05:41:38 darius Exp $ */
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7
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8 #include <stdio.h>
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9
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10 #include "zutil.h"
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11
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12 #ifndef __GO32__
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13 extern void exit __P((int));
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14 #endif
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15
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16 char *zlib_version = ZLIB_VERSION;
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17
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18 char *z_errmsg[] = {
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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 ""};
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27
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28
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29 void z_error (m)
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30 char *m;
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31 {
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32 fprintf(stderr, "%s\n", m);
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33 exit(1);
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34 }
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35
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36 #ifndef HAVE_MEMCPY
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37
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38 void zmemcpy(dest, source, len)
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39 Byte* dest;
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40 Byte* source;
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41 uInt len;
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42 {
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43 if (len == 0) return;
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44 do {
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45 *dest++ = *source++; /* ??? to be unrolled */
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46 } while (--len != 0);
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47 }
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48
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49 void zmemzero(dest, len)
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50 Byte* dest;
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51 uInt len;
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52 {
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53 if (len == 0) return;
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54 do {
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55 *dest++ = 0; /* ??? to be unrolled */
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56 } while (--len != 0);
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57 }
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58 #endif
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59
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60 #if defined(__TURBOC__) && !defined(__SMALL__)
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61
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62 # define MY_ZCALLOC
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63
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64 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
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65 * and farmalloc(64K) returns a pointer with an offset of 8, so we
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66 * must fix the pointer. Warning: the pointer must be put back to its
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67 * original form in order to free it, use zcfree().
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68 */
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69
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70 #define MAX_PTR 10
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71 /* 10*64K = 640K */
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72
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73 local int next_ptr = 0;
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74
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75 typedef struct ptr_table_s {
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76 voidp org_ptr;
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77 voidp new_ptr;
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78 } ptr_table;
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79
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80 local ptr_table table[MAX_PTR];
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81 /* This table is used to remember the original form of pointers
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82 * to large buffers (64K). Such pointers are normalized with a zero offset.
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83 * Since MSDOS is not a preemptive multitasking OS, this table is not
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84 * protected from concurrent access. This hack doesn't work anyway on
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85 * a protected system like OS/2. Use Microsoft C instead.
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86 */
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87
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88 voidp zcalloc (voidp opaque, unsigned items, unsigned size)
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89 {
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90 voidp buf = opaque; /* just to make some compilers happy */
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91 ulg bsize = (ulg)items*size;
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92
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93 if (bsize < 65536L) {
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94 buf = farmalloc(bsize);
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95 if (*(ush*)&buf != 0) return buf;
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96 } else {
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97 buf = farmalloc(bsize + 16L);
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98 }
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99 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
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100 table[next_ptr].org_ptr = buf;
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101
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102 /* Normalize the pointer to seg:0 */
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103 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
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104 *(ush*)&buf = 0;
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105 table[next_ptr++].new_ptr = buf;
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106 return buf;
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107 }
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108
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109 void zcfree (voidp opaque, voidp ptr)
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110 {
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111 int n;
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112 if (*(ush*)&ptr != 0) { /* object < 64K */
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113 farfree(ptr);
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114 return;
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115 }
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116 /* Find the original pointer */
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117 for (n = 0; n < next_ptr; n++) {
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118 if (ptr != table[n].new_ptr) continue;
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119
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120 farfree(table[n].org_ptr);
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121 while (++n < next_ptr) {
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122 table[n-1] = table[n];
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123 }
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124 next_ptr--;
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125 return;
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126 }
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127 ptr = opaque; /* just to make some compilers happy */
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128 z_error("zcfree: ptr not found");
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129 }
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130 #endif /* __TURBOC__ */
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131
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132 #if defined(M_I86CM) || defined(M_I86LM) /* MSC compact or large model */
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133
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134 # define MY_ZCALLOC
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135
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136 #if (!defined(_MSC_VER) || (_MSC_VER < 600))
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137 # define _halloc halloc
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138 # define _hfree hfree
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139 #endif
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140
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141 voidp zcalloc (voidp opaque, unsigned items, unsigned size)
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142 {
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143 if (opaque) opaque = 0; /* to make compiler happy */
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144 return _halloc((long)items, size);
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145 }
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146
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147 void zcfree (voidp opaque, voidp ptr)
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148 {
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149 if (opaque) opaque = 0; /* to make compiler happy */
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150 _hfree(ptr);
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151 }
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152
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153 #endif /* defined(M_I86CM) || defined(M_I86LM) */
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154
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155
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156 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
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157
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158 #ifndef __GO32__
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159 extern voidp calloc __P((uInt items, uInt size));
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160 extern void free __P((voidp ptr));
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161 #endif
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162
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163 voidp zcalloc (opaque, items, size)
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164 voidp opaque;
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165 unsigned items;
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166 unsigned size;
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167 {
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168 return calloc(items, size);
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169 }
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170
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171 void zcfree (opaque, ptr)
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172 voidp opaque;
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173 voidp ptr;
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174 {
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175 free(ptr);
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176 }
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177
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178 #endif /* MY_ZCALLOC */
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