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1 /* zutil.c -- target dependent utility functions for the compression library |
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2 * Copyright (C) 1995-1998 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 <e32base.h> |
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9 #include "zutil.h" |
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10 |
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11 |
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12 struct internal_state {int dummy;}; /* for buggy compilers */ |
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13 |
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14 #ifndef STDC |
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15 extern void exit OF((int)); |
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16 #endif |
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17 |
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18 const char * const z_errmsg[10] = { |
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19 "need dictionary", /* Z_NEED_DICT 2 */ |
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20 "stream end", /* Z_STREAM_END 1 */ |
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21 "", /* Z_OK 0 */ |
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22 "file error", /* Z_ERRNO (-1) */ |
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23 "stream error", /* Z_STREAM_ERROR (-2) */ |
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24 "data error", /* Z_DATA_ERROR (-3) */ |
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25 "insufficient memory", /* Z_MEM_ERROR (-4) */ |
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26 "buffer error", /* Z_BUF_ERROR (-5) */ |
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27 "incompatible version",/* Z_VERSION_ERROR (-6) */ |
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28 ""}; |
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29 |
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30 |
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31 EXPORT_C const char * ZEXPORT zlibVersion() |
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32 { |
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33 return ZLIB_VERSION; |
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34 } |
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35 |
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36 #ifdef DEBUG |
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37 |
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38 # ifndef verbose |
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39 # define verbose 0 |
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40 # endif |
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41 const int z_verbose = verbose; |
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42 |
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43 void z_error (m) |
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44 char *m; |
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45 { |
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46 fprintf(stderr, "%s\n", m); |
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47 exit(1); |
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48 } |
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49 #endif |
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50 |
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51 /* exported to allow conversion of error code to string for compress() and |
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52 * uncompress() |
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53 */ |
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54 EXPORT_C const char * ZEXPORT zError( |
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55 int err) |
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56 { |
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57 return ERR_MSG(err); |
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58 } |
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59 |
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60 |
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61 #ifndef HAVE_MEMCPY |
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62 |
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63 void zmemcpy(dest, source, len) |
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64 Bytef* dest; |
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65 const Bytef* source; |
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66 uInt len; |
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67 { |
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68 if (len == 0) return; |
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69 do { |
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70 *dest++ = *source++; /* ??? to be unrolled */ |
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71 } while (--len != 0); |
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72 } |
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73 |
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74 int zmemcmp(s1, s2, len) |
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75 const Bytef* s1; |
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76 const Bytef* s2; |
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77 uInt len; |
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78 { |
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79 uInt j; |
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80 |
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81 for (j = 0; j < len; j++) { |
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82 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; |
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83 } |
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84 return 0; |
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85 } |
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86 |
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87 void zmemzero(dest, len) |
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88 Bytef* dest; |
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89 uInt len; |
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90 { |
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91 if (len == 0) return; |
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92 do { |
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93 *dest++ = 0; /* ??? to be unrolled */ |
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94 } while (--len != 0); |
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95 } |
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96 #endif |
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97 |
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98 #ifdef __TURBOC__ |
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99 #if (defined( __BORLANDC__) || !defined(SMALL_MEDIUM)) && !defined(__32BIT__) |
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100 /* Small and medium model in Turbo C are for now limited to near allocation |
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101 * with reduced MAX_WBITS and MAX_MEM_LEVEL |
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102 */ |
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103 # define MY_ZCALLOC |
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104 |
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105 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes |
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106 * and farmalloc(64K) returns a pointer with an offset of 8, so we |
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107 * must fix the pointer. Warning: the pointer must be put back to its |
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108 * original form in order to free it, use zcfree(). |
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109 */ |
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110 |
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111 #define MAX_PTR 10 |
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112 /* 10*64K = 640K */ |
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113 |
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114 local int next_ptr = 0; |
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115 |
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116 typedef struct ptr_table_s { |
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117 voidpf org_ptr; |
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118 voidpf new_ptr; |
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119 } ptr_table; |
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120 |
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121 const local ptr_table table[MAX_PTR]; |
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122 /* This table is used to remember the original form of pointers |
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123 * to large buffers (64K). Such pointers are normalized with a zero offset. |
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124 * Since MSDOS is not a preemptive multitasking OS, this table is not |
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125 * protected from concurrent access. This hack doesn't work anyway on |
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126 * a protected system like OS/2. Use Microsoft C instead. |
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127 */ |
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128 |
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129 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size) |
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130 { |
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131 voidpf buf = opaque; /* just to make some compilers happy */ |
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132 ulg bsize = (ulg)items*size; |
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133 |
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134 /* If we allocate less than 65520 bytes, we assume that farmalloc |
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135 * will return a usable pointer which doesn't have to be normalized. |
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136 */ |
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137 if (bsize < 65520L) { |
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138 buf = farmalloc(bsize); |
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139 if (*(ush*)&buf != 0) return buf; |
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140 } else { |
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141 buf = farmalloc(bsize + 16L); |
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142 } |
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143 if (buf == NULL || next_ptr >= MAX_PTR) return NULL; |
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144 table[next_ptr].org_ptr = buf; |
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145 |
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146 /* Normalize the pointer to seg:0 */ |
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147 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; |
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148 *(ush*)&buf = 0; |
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149 table[next_ptr++].new_ptr = buf; |
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150 return buf; |
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151 } |
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152 |
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153 void zcfree (voidpf opaque, voidpf ptr) |
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154 { |
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155 int n; |
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156 if (*(ush*)&ptr != 0) { /* object < 64K */ |
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157 farfree(ptr); |
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158 return; |
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159 } |
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160 /* Find the original pointer */ |
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161 for (n = 0; n < next_ptr; n++) { |
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162 if (ptr != table[n].new_ptr) continue; |
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163 |
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164 farfree(table[n].org_ptr); |
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165 while (++n < next_ptr) { |
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166 table[n-1] = table[n]; |
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167 } |
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168 next_ptr--; |
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169 return; |
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170 } |
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171 ptr = opaque; /* just to make some compilers happy */ |
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172 Assert(0, "zcfree: ptr not found"); |
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173 } |
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174 #endif |
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175 #endif /* __TURBOC__ */ |
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176 |
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177 |
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178 #if defined(M_I86) && !defined(__32BIT__) |
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179 /* Microsoft C in 16-bit mode */ |
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180 |
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181 # define MY_ZCALLOC |
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182 |
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183 #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) |
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184 # define _halloc halloc |
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185 # define _hfree hfree |
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186 #endif |
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187 |
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188 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size) |
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189 { |
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190 if (opaque) opaque = 0; /* to make compiler happy */ |
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191 return _halloc((long)items, size); |
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192 } |
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193 |
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194 void zcfree (voidpf opaque, voidpf ptr) |
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195 { |
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196 if (opaque) opaque = 0; /* to make compiler happy */ |
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197 _hfree(ptr); |
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198 } |
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199 |
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200 #endif /* MSC */ |
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201 |
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202 |
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203 #ifndef MY_ZCALLOC /* Any system without a special alloc function */ |
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204 |
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205 #ifndef STDC |
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206 extern voidp calloc OF((uInt items, uInt size)); |
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207 extern void free OF((voidpf ptr)); |
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208 #endif |
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209 |
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210 voidpf zcalloc ( |
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211 voidpf opaque, |
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212 unsigned items, |
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213 unsigned size) |
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214 { |
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215 if (opaque) items += size - size; /* make compiler happy */ |
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216 // return (voidpf)calloc(items, size); |
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217 TInt bytes = items*size; |
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218 TAny *ptr = User::Alloc(bytes); |
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219 if (ptr) |
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220 Mem::FillZ(ptr,bytes); |
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221 return (voidpf) ptr; // Mark Ryan, Symbian 14/9/99 |
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222 } |
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223 |
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224 void zcfree ( |
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225 voidpf opaque, |
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226 voidpf ptr) |
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227 { |
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228 //free(ptr); |
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229 User::Free(ptr); // Mark Ryan, Symbian 14/9/99 |
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230 if (opaque) return; /* make compiler happy */ |
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231 } |
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232 |
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233 #endif /* MY_ZCALLOC */ |