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annotate libs/zlib/zutil.c @ 35:643f4ab609a4

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added readme and license
author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 31 Oct 2015 05:45:35 +0200
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nuclear@2 1 /* zutil.c -- target dependent utility functions for the compression library
nuclear@2 2 * Copyright (C) 1995-2005 Jean-loup Gailly.
nuclear@2 3 * For conditions of distribution and use, see copyright notice in zlib.h
nuclear@2 4 */
nuclear@2 5
nuclear@2 6 /* @(#) $Id$ */
nuclear@2 7
nuclear@2 8 #include "zutil.h"
nuclear@2 9
nuclear@2 10 #ifndef NO_DUMMY_DECL
nuclear@2 11 struct internal_state {int dummy;}; /* for buggy compilers */
nuclear@2 12 #endif
nuclear@2 13
nuclear@2 14 const char * const z_errmsg[10] = {
nuclear@2 15 "need dictionary", /* Z_NEED_DICT 2 */
nuclear@2 16 "stream end", /* Z_STREAM_END 1 */
nuclear@2 17 "", /* Z_OK 0 */
nuclear@2 18 "file error", /* Z_ERRNO (-1) */
nuclear@2 19 "stream error", /* Z_STREAM_ERROR (-2) */
nuclear@2 20 "data error", /* Z_DATA_ERROR (-3) */
nuclear@2 21 "insufficient memory", /* Z_MEM_ERROR (-4) */
nuclear@2 22 "buffer error", /* Z_BUF_ERROR (-5) */
nuclear@2 23 "incompatible version",/* Z_VERSION_ERROR (-6) */
nuclear@2 24 ""};
nuclear@2 25
nuclear@2 26
nuclear@2 27 const char * ZEXPORT zlibVersion()
nuclear@2 28 {
nuclear@2 29 return ZLIB_VERSION;
nuclear@2 30 }
nuclear@2 31
nuclear@2 32 uLong ZEXPORT zlibCompileFlags()
nuclear@2 33 {
nuclear@2 34 uLong flags;
nuclear@2 35
nuclear@2 36 flags = 0;
nuclear@2 37 switch (sizeof(uInt)) {
nuclear@2 38 case 2: break;
nuclear@2 39 case 4: flags += 1; break;
nuclear@2 40 case 8: flags += 2; break;
nuclear@2 41 default: flags += 3;
nuclear@2 42 }
nuclear@2 43 switch (sizeof(uLong)) {
nuclear@2 44 case 2: break;
nuclear@2 45 case 4: flags += 1 << 2; break;
nuclear@2 46 case 8: flags += 2 << 2; break;
nuclear@2 47 default: flags += 3 << 2;
nuclear@2 48 }
nuclear@2 49 switch (sizeof(voidpf)) {
nuclear@2 50 case 2: break;
nuclear@2 51 case 4: flags += 1 << 4; break;
nuclear@2 52 case 8: flags += 2 << 4; break;
nuclear@2 53 default: flags += 3 << 4;
nuclear@2 54 }
nuclear@2 55 switch (sizeof(z_off_t)) {
nuclear@2 56 case 2: break;
nuclear@2 57 case 4: flags += 1 << 6; break;
nuclear@2 58 case 8: flags += 2 << 6; break;
nuclear@2 59 default: flags += 3 << 6;
nuclear@2 60 }
nuclear@2 61 #ifdef DEBUG
nuclear@2 62 flags += 1 << 8;
nuclear@2 63 #endif
nuclear@2 64 #if defined(ASMV) || defined(ASMINF)
nuclear@2 65 flags += 1 << 9;
nuclear@2 66 #endif
nuclear@2 67 #ifdef ZLIB_WINAPI
nuclear@2 68 flags += 1 << 10;
nuclear@2 69 #endif
nuclear@2 70 #ifdef BUILDFIXED
nuclear@2 71 flags += 1 << 12;
nuclear@2 72 #endif
nuclear@2 73 #ifdef DYNAMIC_CRC_TABLE
nuclear@2 74 flags += 1 << 13;
nuclear@2 75 #endif
nuclear@2 76 #ifdef NO_GZCOMPRESS
nuclear@2 77 flags += 1L << 16;
nuclear@2 78 #endif
nuclear@2 79 #ifdef NO_GZIP
nuclear@2 80 flags += 1L << 17;
nuclear@2 81 #endif
nuclear@2 82 #ifdef PKZIP_BUG_WORKAROUND
nuclear@2 83 flags += 1L << 20;
nuclear@2 84 #endif
nuclear@2 85 #ifdef FASTEST
nuclear@2 86 flags += 1L << 21;
nuclear@2 87 #endif
nuclear@2 88 #ifdef STDC
nuclear@2 89 # ifdef NO_vsnprintf
nuclear@2 90 flags += 1L << 25;
nuclear@2 91 # ifdef HAS_vsprintf_void
nuclear@2 92 flags += 1L << 26;
nuclear@2 93 # endif
nuclear@2 94 # else
nuclear@2 95 # ifdef HAS_vsnprintf_void
nuclear@2 96 flags += 1L << 26;
nuclear@2 97 # endif
nuclear@2 98 # endif
nuclear@2 99 #else
nuclear@2 100 flags += 1L << 24;
nuclear@2 101 # ifdef NO_snprintf
nuclear@2 102 flags += 1L << 25;
nuclear@2 103 # ifdef HAS_sprintf_void
nuclear@2 104 flags += 1L << 26;
nuclear@2 105 # endif
nuclear@2 106 # else
nuclear@2 107 # ifdef HAS_snprintf_void
nuclear@2 108 flags += 1L << 26;
nuclear@2 109 # endif
nuclear@2 110 # endif
nuclear@2 111 #endif
nuclear@2 112 return flags;
nuclear@2 113 }
nuclear@2 114
nuclear@2 115 #ifdef DEBUG
nuclear@2 116
nuclear@2 117 # ifndef verbose
nuclear@2 118 # define verbose 0
nuclear@2 119 # endif
nuclear@2 120 int z_verbose = verbose;
nuclear@2 121
nuclear@2 122 void z_error (m)
nuclear@2 123 char *m;
nuclear@2 124 {
nuclear@2 125 fprintf(stderr, "%s\n", m);
nuclear@2 126 exit(1);
nuclear@2 127 }
nuclear@2 128 #endif
nuclear@2 129
nuclear@2 130 /* exported to allow conversion of error code to string for compress() and
nuclear@2 131 * uncompress()
nuclear@2 132 */
nuclear@2 133 const char * ZEXPORT zError(err)
nuclear@2 134 int err;
nuclear@2 135 {
nuclear@2 136 return ERR_MSG(err);
nuclear@2 137 }
nuclear@2 138
nuclear@2 139 #if defined(_WIN32_WCE)
nuclear@2 140 /* The Microsoft C Run-Time Library for Windows CE doesn't have
nuclear@2 141 * errno. We define it as a global variable to simplify porting.
nuclear@2 142 * Its value is always 0 and should not be used.
nuclear@2 143 */
nuclear@2 144 int errno = 0;
nuclear@2 145 #endif
nuclear@2 146
nuclear@2 147 #ifndef HAVE_MEMCPY
nuclear@2 148
nuclear@2 149 void zmemcpy(dest, source, len)
nuclear@2 150 Bytef* dest;
nuclear@2 151 const Bytef* source;
nuclear@2 152 uInt len;
nuclear@2 153 {
nuclear@2 154 if (len == 0) return;
nuclear@2 155 do {
nuclear@2 156 *dest++ = *source++; /* ??? to be unrolled */
nuclear@2 157 } while (--len != 0);
nuclear@2 158 }
nuclear@2 159
nuclear@2 160 int zmemcmp(s1, s2, len)
nuclear@2 161 const Bytef* s1;
nuclear@2 162 const Bytef* s2;
nuclear@2 163 uInt len;
nuclear@2 164 {
nuclear@2 165 uInt j;
nuclear@2 166
nuclear@2 167 for (j = 0; j < len; j++) {
nuclear@2 168 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
nuclear@2 169 }
nuclear@2 170 return 0;
nuclear@2 171 }
nuclear@2 172
nuclear@2 173 void zmemzero(dest, len)
nuclear@2 174 Bytef* dest;
nuclear@2 175 uInt len;
nuclear@2 176 {
nuclear@2 177 if (len == 0) return;
nuclear@2 178 do {
nuclear@2 179 *dest++ = 0; /* ??? to be unrolled */
nuclear@2 180 } while (--len != 0);
nuclear@2 181 }
nuclear@2 182 #endif
nuclear@2 183
nuclear@2 184
nuclear@2 185 #ifdef SYS16BIT
nuclear@2 186
nuclear@2 187 #ifdef __TURBOC__
nuclear@2 188 /* Turbo C in 16-bit mode */
nuclear@2 189
nuclear@2 190 # define MY_ZCALLOC
nuclear@2 191
nuclear@2 192 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
nuclear@2 193 * and farmalloc(64K) returns a pointer with an offset of 8, so we
nuclear@2 194 * must fix the pointer. Warning: the pointer must be put back to its
nuclear@2 195 * original form in order to free it, use zcfree().
nuclear@2 196 */
nuclear@2 197
nuclear@2 198 #define MAX_PTR 10
nuclear@2 199 /* 10*64K = 640K */
nuclear@2 200
nuclear@2 201 local int next_ptr = 0;
nuclear@2 202
nuclear@2 203 typedef struct ptr_table_s {
nuclear@2 204 voidpf org_ptr;
nuclear@2 205 voidpf new_ptr;
nuclear@2 206 } ptr_table;
nuclear@2 207
nuclear@2 208 local ptr_table table[MAX_PTR];
nuclear@2 209 /* This table is used to remember the original form of pointers
nuclear@2 210 * to large buffers (64K). Such pointers are normalized with a zero offset.
nuclear@2 211 * Since MSDOS is not a preemptive multitasking OS, this table is not
nuclear@2 212 * protected from concurrent access. This hack doesn't work anyway on
nuclear@2 213 * a protected system like OS/2. Use Microsoft C instead.
nuclear@2 214 */
nuclear@2 215
nuclear@2 216 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
nuclear@2 217 {
nuclear@2 218 voidpf buf = opaque; /* just to make some compilers happy */
nuclear@2 219 ulg bsize = (ulg)items*size;
nuclear@2 220
nuclear@2 221 /* If we allocate less than 65520 bytes, we assume that farmalloc
nuclear@2 222 * will return a usable pointer which doesn't have to be normalized.
nuclear@2 223 */
nuclear@2 224 if (bsize < 65520L) {
nuclear@2 225 buf = farmalloc(bsize);
nuclear@2 226 if (*(ush*)&buf != 0) return buf;
nuclear@2 227 } else {
nuclear@2 228 buf = farmalloc(bsize + 16L);
nuclear@2 229 }
nuclear@2 230 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
nuclear@2 231 table[next_ptr].org_ptr = buf;
nuclear@2 232
nuclear@2 233 /* Normalize the pointer to seg:0 */
nuclear@2 234 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
nuclear@2 235 *(ush*)&buf = 0;
nuclear@2 236 table[next_ptr++].new_ptr = buf;
nuclear@2 237 return buf;
nuclear@2 238 }
nuclear@2 239
nuclear@2 240 void zcfree (voidpf opaque, voidpf ptr)
nuclear@2 241 {
nuclear@2 242 int n;
nuclear@2 243 if (*(ush*)&ptr != 0) { /* object < 64K */
nuclear@2 244 farfree(ptr);
nuclear@2 245 return;
nuclear@2 246 }
nuclear@2 247 /* Find the original pointer */
nuclear@2 248 for (n = 0; n < next_ptr; n++) {
nuclear@2 249 if (ptr != table[n].new_ptr) continue;
nuclear@2 250
nuclear@2 251 farfree(table[n].org_ptr);
nuclear@2 252 while (++n < next_ptr) {
nuclear@2 253 table[n-1] = table[n];
nuclear@2 254 }
nuclear@2 255 next_ptr--;
nuclear@2 256 return;
nuclear@2 257 }
nuclear@2 258 ptr = opaque; /* just to make some compilers happy */
nuclear@2 259 Assert(0, "zcfree: ptr not found");
nuclear@2 260 }
nuclear@2 261
nuclear@2 262 #endif /* __TURBOC__ */
nuclear@2 263
nuclear@2 264
nuclear@2 265 #ifdef M_I86
nuclear@2 266 /* Microsoft C in 16-bit mode */
nuclear@2 267
nuclear@2 268 # define MY_ZCALLOC
nuclear@2 269
nuclear@2 270 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
nuclear@2 271 # define _halloc halloc
nuclear@2 272 # define _hfree hfree
nuclear@2 273 #endif
nuclear@2 274
nuclear@2 275 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
nuclear@2 276 {
nuclear@2 277 if (opaque) opaque = 0; /* to make compiler happy */
nuclear@2 278 return _halloc((long)items, size);
nuclear@2 279 }
nuclear@2 280
nuclear@2 281 void zcfree (voidpf opaque, voidpf ptr)
nuclear@2 282 {
nuclear@2 283 if (opaque) opaque = 0; /* to make compiler happy */
nuclear@2 284 _hfree(ptr);
nuclear@2 285 }
nuclear@2 286
nuclear@2 287 #endif /* M_I86 */
nuclear@2 288
nuclear@2 289 #endif /* SYS16BIT */
nuclear@2 290
nuclear@2 291
nuclear@2 292 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
nuclear@2 293
nuclear@2 294 #ifndef STDC
nuclear@2 295 extern voidp malloc OF((uInt size));
nuclear@2 296 extern voidp calloc OF((uInt items, uInt size));
nuclear@2 297 extern void free OF((voidpf ptr));
nuclear@2 298 #endif
nuclear@2 299
nuclear@2 300 voidpf zcalloc (opaque, items, size)
nuclear@2 301 voidpf opaque;
nuclear@2 302 unsigned items;
nuclear@2 303 unsigned size;
nuclear@2 304 {
nuclear@2 305 if (opaque) items += size - size; /* make compiler happy */
nuclear@2 306 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
nuclear@2 307 (voidpf)calloc(items, size);
nuclear@2 308 }
nuclear@2 309
nuclear@2 310 void zcfree (opaque, ptr)
nuclear@2 311 voidpf opaque;
nuclear@2 312 voidpf ptr;
nuclear@2 313 {
nuclear@2 314 free(ptr);
nuclear@2 315 if (opaque) return; /* make compiler happy */
nuclear@2 316 }
nuclear@2 317
nuclear@2 318 #endif /* MY_ZCALLOC */