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annotate libs/zlib/zutil.c @ 0:b2f14e535253

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initial commit
author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 01 Feb 2014 19:58:19 +0200
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nuclear@0 1 /* zutil.c -- target dependent utility functions for the compression library
nuclear@0 2 * Copyright (C) 1995-2005 Jean-loup Gailly.
nuclear@0 3 * For conditions of distribution and use, see copyright notice in zlib.h
nuclear@0 4 */
nuclear@0 5
nuclear@0 6 /* @(#) $Id$ */
nuclear@0 7
nuclear@0 8 #include "zutil.h"
nuclear@0 9
nuclear@0 10 #ifndef NO_DUMMY_DECL
nuclear@0 11 struct internal_state {int dummy;}; /* for buggy compilers */
nuclear@0 12 #endif
nuclear@0 13
nuclear@0 14 const char * const z_errmsg[10] = {
nuclear@0 15 "need dictionary", /* Z_NEED_DICT 2 */
nuclear@0 16 "stream end", /* Z_STREAM_END 1 */
nuclear@0 17 "", /* Z_OK 0 */
nuclear@0 18 "file error", /* Z_ERRNO (-1) */
nuclear@0 19 "stream error", /* Z_STREAM_ERROR (-2) */
nuclear@0 20 "data error", /* Z_DATA_ERROR (-3) */
nuclear@0 21 "insufficient memory", /* Z_MEM_ERROR (-4) */
nuclear@0 22 "buffer error", /* Z_BUF_ERROR (-5) */
nuclear@0 23 "incompatible version",/* Z_VERSION_ERROR (-6) */
nuclear@0 24 ""};
nuclear@0 25
nuclear@0 26
nuclear@0 27 const char * ZEXPORT zlibVersion()
nuclear@0 28 {
nuclear@0 29 return ZLIB_VERSION;
nuclear@0 30 }
nuclear@0 31
nuclear@0 32 uLong ZEXPORT zlibCompileFlags()
nuclear@0 33 {
nuclear@0 34 uLong flags;
nuclear@0 35
nuclear@0 36 flags = 0;
nuclear@0 37 switch (sizeof(uInt)) {
nuclear@0 38 case 2: break;
nuclear@0 39 case 4: flags += 1; break;
nuclear@0 40 case 8: flags += 2; break;
nuclear@0 41 default: flags += 3;
nuclear@0 42 }
nuclear@0 43 switch (sizeof(uLong)) {
nuclear@0 44 case 2: break;
nuclear@0 45 case 4: flags += 1 << 2; break;
nuclear@0 46 case 8: flags += 2 << 2; break;
nuclear@0 47 default: flags += 3 << 2;
nuclear@0 48 }
nuclear@0 49 switch (sizeof(voidpf)) {
nuclear@0 50 case 2: break;
nuclear@0 51 case 4: flags += 1 << 4; break;
nuclear@0 52 case 8: flags += 2 << 4; break;
nuclear@0 53 default: flags += 3 << 4;
nuclear@0 54 }
nuclear@0 55 switch (sizeof(z_off_t)) {
nuclear@0 56 case 2: break;
nuclear@0 57 case 4: flags += 1 << 6; break;
nuclear@0 58 case 8: flags += 2 << 6; break;
nuclear@0 59 default: flags += 3 << 6;
nuclear@0 60 }
nuclear@0 61 #ifdef DEBUG
nuclear@0 62 flags += 1 << 8;
nuclear@0 63 #endif
nuclear@0 64 #if defined(ASMV) || defined(ASMINF)
nuclear@0 65 flags += 1 << 9;
nuclear@0 66 #endif
nuclear@0 67 #ifdef ZLIB_WINAPI
nuclear@0 68 flags += 1 << 10;
nuclear@0 69 #endif
nuclear@0 70 #ifdef BUILDFIXED
nuclear@0 71 flags += 1 << 12;
nuclear@0 72 #endif
nuclear@0 73 #ifdef DYNAMIC_CRC_TABLE
nuclear@0 74 flags += 1 << 13;
nuclear@0 75 #endif
nuclear@0 76 #ifdef NO_GZCOMPRESS
nuclear@0 77 flags += 1L << 16;
nuclear@0 78 #endif
nuclear@0 79 #ifdef NO_GZIP
nuclear@0 80 flags += 1L << 17;
nuclear@0 81 #endif
nuclear@0 82 #ifdef PKZIP_BUG_WORKAROUND
nuclear@0 83 flags += 1L << 20;
nuclear@0 84 #endif
nuclear@0 85 #ifdef FASTEST
nuclear@0 86 flags += 1L << 21;
nuclear@0 87 #endif
nuclear@0 88 #ifdef STDC
nuclear@0 89 # ifdef NO_vsnprintf
nuclear@0 90 flags += 1L << 25;
nuclear@0 91 # ifdef HAS_vsprintf_void
nuclear@0 92 flags += 1L << 26;
nuclear@0 93 # endif
nuclear@0 94 # else
nuclear@0 95 # ifdef HAS_vsnprintf_void
nuclear@0 96 flags += 1L << 26;
nuclear@0 97 # endif
nuclear@0 98 # endif
nuclear@0 99 #else
nuclear@0 100 flags += 1L << 24;
nuclear@0 101 # ifdef NO_snprintf
nuclear@0 102 flags += 1L << 25;
nuclear@0 103 # ifdef HAS_sprintf_void
nuclear@0 104 flags += 1L << 26;
nuclear@0 105 # endif
nuclear@0 106 # else
nuclear@0 107 # ifdef HAS_snprintf_void
nuclear@0 108 flags += 1L << 26;
nuclear@0 109 # endif
nuclear@0 110 # endif
nuclear@0 111 #endif
nuclear@0 112 return flags;
nuclear@0 113 }
nuclear@0 114
nuclear@0 115 #ifdef DEBUG
nuclear@0 116
nuclear@0 117 # ifndef verbose
nuclear@0 118 # define verbose 0
nuclear@0 119 # endif
nuclear@0 120 int z_verbose = verbose;
nuclear@0 121
nuclear@0 122 void z_error (m)
nuclear@0 123 char *m;
nuclear@0 124 {
nuclear@0 125 fprintf(stderr, "%s\n", m);
nuclear@0 126 exit(1);
nuclear@0 127 }
nuclear@0 128 #endif
nuclear@0 129
nuclear@0 130 /* exported to allow conversion of error code to string for compress() and
nuclear@0 131 * uncompress()
nuclear@0 132 */
nuclear@0 133 const char * ZEXPORT zError(err)
nuclear@0 134 int err;
nuclear@0 135 {
nuclear@0 136 return ERR_MSG(err);
nuclear@0 137 }
nuclear@0 138
nuclear@0 139 #if defined(_WIN32_WCE)
nuclear@0 140 /* The Microsoft C Run-Time Library for Windows CE doesn't have
nuclear@0 141 * errno. We define it as a global variable to simplify porting.
nuclear@0 142 * Its value is always 0 and should not be used.
nuclear@0 143 */
nuclear@0 144 int errno = 0;
nuclear@0 145 #endif
nuclear@0 146
nuclear@0 147 #ifndef HAVE_MEMCPY
nuclear@0 148
nuclear@0 149 void zmemcpy(dest, source, len)
nuclear@0 150 Bytef* dest;
nuclear@0 151 const Bytef* source;
nuclear@0 152 uInt len;
nuclear@0 153 {
nuclear@0 154 if (len == 0) return;
nuclear@0 155 do {
nuclear@0 156 *dest++ = *source++; /* ??? to be unrolled */
nuclear@0 157 } while (--len != 0);
nuclear@0 158 }
nuclear@0 159
nuclear@0 160 int zmemcmp(s1, s2, len)
nuclear@0 161 const Bytef* s1;
nuclear@0 162 const Bytef* s2;
nuclear@0 163 uInt len;
nuclear@0 164 {
nuclear@0 165 uInt j;
nuclear@0 166
nuclear@0 167 for (j = 0; j < len; j++) {
nuclear@0 168 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
nuclear@0 169 }
nuclear@0 170 return 0;
nuclear@0 171 }
nuclear@0 172
nuclear@0 173 void zmemzero(dest, len)
nuclear@0 174 Bytef* dest;
nuclear@0 175 uInt len;
nuclear@0 176 {
nuclear@0 177 if (len == 0) return;
nuclear@0 178 do {
nuclear@0 179 *dest++ = 0; /* ??? to be unrolled */
nuclear@0 180 } while (--len != 0);
nuclear@0 181 }
nuclear@0 182 #endif
nuclear@0 183
nuclear@0 184
nuclear@0 185 #ifdef SYS16BIT
nuclear@0 186
nuclear@0 187 #ifdef __TURBOC__
nuclear@0 188 /* Turbo C in 16-bit mode */
nuclear@0 189
nuclear@0 190 # define MY_ZCALLOC
nuclear@0 191
nuclear@0 192 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
nuclear@0 193 * and farmalloc(64K) returns a pointer with an offset of 8, so we
nuclear@0 194 * must fix the pointer. Warning: the pointer must be put back to its
nuclear@0 195 * original form in order to free it, use zcfree().
nuclear@0 196 */
nuclear@0 197
nuclear@0 198 #define MAX_PTR 10
nuclear@0 199 /* 10*64K = 640K */
nuclear@0 200
nuclear@0 201 local int next_ptr = 0;
nuclear@0 202
nuclear@0 203 typedef struct ptr_table_s {
nuclear@0 204 voidpf org_ptr;
nuclear@0 205 voidpf new_ptr;
nuclear@0 206 } ptr_table;
nuclear@0 207
nuclear@0 208 local ptr_table table[MAX_PTR];
nuclear@0 209 /* This table is used to remember the original form of pointers
nuclear@0 210 * to large buffers (64K). Such pointers are normalized with a zero offset.
nuclear@0 211 * Since MSDOS is not a preemptive multitasking OS, this table is not
nuclear@0 212 * protected from concurrent access. This hack doesn't work anyway on
nuclear@0 213 * a protected system like OS/2. Use Microsoft C instead.
nuclear@0 214 */
nuclear@0 215
nuclear@0 216 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
nuclear@0 217 {
nuclear@0 218 voidpf buf = opaque; /* just to make some compilers happy */
nuclear@0 219 ulg bsize = (ulg)items*size;
nuclear@0 220
nuclear@0 221 /* If we allocate less than 65520 bytes, we assume that farmalloc
nuclear@0 222 * will return a usable pointer which doesn't have to be normalized.
nuclear@0 223 */
nuclear@0 224 if (bsize < 65520L) {
nuclear@0 225 buf = farmalloc(bsize);
nuclear@0 226 if (*(ush*)&buf != 0) return buf;
nuclear@0 227 } else {
nuclear@0 228 buf = farmalloc(bsize + 16L);
nuclear@0 229 }
nuclear@0 230 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
nuclear@0 231 table[next_ptr].org_ptr = buf;
nuclear@0 232
nuclear@0 233 /* Normalize the pointer to seg:0 */
nuclear@0 234 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
nuclear@0 235 *(ush*)&buf = 0;
nuclear@0 236 table[next_ptr++].new_ptr = buf;
nuclear@0 237 return buf;
nuclear@0 238 }
nuclear@0 239
nuclear@0 240 void zcfree (voidpf opaque, voidpf ptr)
nuclear@0 241 {
nuclear@0 242 int n;
nuclear@0 243 if (*(ush*)&ptr != 0) { /* object < 64K */
nuclear@0 244 farfree(ptr);
nuclear@0 245 return;
nuclear@0 246 }
nuclear@0 247 /* Find the original pointer */
nuclear@0 248 for (n = 0; n < next_ptr; n++) {
nuclear@0 249 if (ptr != table[n].new_ptr) continue;
nuclear@0 250
nuclear@0 251 farfree(table[n].org_ptr);
nuclear@0 252 while (++n < next_ptr) {
nuclear@0 253 table[n-1] = table[n];
nuclear@0 254 }
nuclear@0 255 next_ptr--;
nuclear@0 256 return;
nuclear@0 257 }
nuclear@0 258 ptr = opaque; /* just to make some compilers happy */
nuclear@0 259 Assert(0, "zcfree: ptr not found");
nuclear@0 260 }
nuclear@0 261
nuclear@0 262 #endif /* __TURBOC__ */
nuclear@0 263
nuclear@0 264
nuclear@0 265 #ifdef M_I86
nuclear@0 266 /* Microsoft C in 16-bit mode */
nuclear@0 267
nuclear@0 268 # define MY_ZCALLOC
nuclear@0 269
nuclear@0 270 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
nuclear@0 271 # define _halloc halloc
nuclear@0 272 # define _hfree hfree
nuclear@0 273 #endif
nuclear@0 274
nuclear@0 275 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
nuclear@0 276 {
nuclear@0 277 if (opaque) opaque = 0; /* to make compiler happy */
nuclear@0 278 return _halloc((long)items, size);
nuclear@0 279 }
nuclear@0 280
nuclear@0 281 void zcfree (voidpf opaque, voidpf ptr)
nuclear@0 282 {
nuclear@0 283 if (opaque) opaque = 0; /* to make compiler happy */
nuclear@0 284 _hfree(ptr);
nuclear@0 285 }
nuclear@0 286
nuclear@0 287 #endif /* M_I86 */
nuclear@0 288
nuclear@0 289 #endif /* SYS16BIT */
nuclear@0 290
nuclear@0 291
nuclear@0 292 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
nuclear@0 293
nuclear@0 294 #ifndef STDC
nuclear@0 295 extern voidp malloc OF((uInt size));
nuclear@0 296 extern voidp calloc OF((uInt items, uInt size));
nuclear@0 297 extern void free OF((voidpf ptr));
nuclear@0 298 #endif
nuclear@0 299
nuclear@0 300 voidpf zcalloc (opaque, items, size)
nuclear@0 301 voidpf opaque;
nuclear@0 302 unsigned items;
nuclear@0 303 unsigned size;
nuclear@0 304 {
nuclear@0 305 if (opaque) items += size - size; /* make compiler happy */
nuclear@0 306 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
nuclear@0 307 (voidpf)calloc(items, size);
nuclear@0 308 }
nuclear@0 309
nuclear@0 310 void zcfree (opaque, ptr)
nuclear@0 311 voidpf opaque;
nuclear@0 312 voidpf ptr;
nuclear@0 313 {
nuclear@0 314 free(ptr);
nuclear@0 315 if (opaque) return; /* make compiler happy */
nuclear@0 316 }
nuclear@0 317
nuclear@0 318 #endif /* MY_ZCALLOC */