1/* 2 * Copyright (c) 2008 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28/* zutil.c -- target dependent utility functions for the compression library 29 * Copyright (C) 1995-2005 Jean-loup Gailly. 30 * For conditions of distribution and use, see copyright notice in zlib.h 31 */ 32 33/* @(#) $Id$ */ 34 35#include "zutil.h" 36 37#ifndef NO_DUMMY_DECL 38struct internal_state {int dummy;}; /* for buggy compilers */ 39#endif 40 41const char * const z_errmsg[10] = { 42"need dictionary", /* Z_NEED_DICT 2 */ 43"stream end", /* Z_STREAM_END 1 */ 44"", /* Z_OK 0 */ 45"file error", /* Z_ERRNO (-1) */ 46"stream error", /* Z_STREAM_ERROR (-2) */ 47"data error", /* Z_DATA_ERROR (-3) */ 48"insufficient memory", /* Z_MEM_ERROR (-4) */ 49"buffer error", /* Z_BUF_ERROR (-5) */ 50"incompatible version",/* Z_VERSION_ERROR (-6) */ 51""}; 52 53 54const char * ZEXPORT zlibVersion() 55{ 56 return ZLIB_VERSION; 57} 58 59uLong ZEXPORT zlibCompileFlags() 60{ 61 uLong flags; 62 63 flags = 0; 64 switch (sizeof(uInt)) { 65 case 2: break; 66 case 4: flags += 1; break; 67 case 8: flags += 2; break; 68 default: flags += 3; 69 } 70 switch (sizeof(uLong)) { 71 case 2: break; 72 case 4: flags += 1 << 2; break; 73 case 8: flags += 2 << 2; break; 74 default: flags += 3 << 2; 75 } 76 switch (sizeof(voidpf)) { 77 case 2: break; 78 case 4: flags += 1 << 4; break; 79 case 8: flags += 2 << 4; break; 80 default: flags += 3 << 4; 81 } 82 switch (sizeof(z_off_t)) { 83 case 2: break; 84 case 4: flags += 1 << 6; break; 85 case 8: flags += 2 << 6; break; 86 default: flags += 3 << 6; 87 } 88#ifdef DEBUG 89 flags += 1 << 8; 90#endif 91#if defined(ASMV) || defined(ASMINF) 92 flags += 1 << 9; 93#endif 94#ifdef ZLIB_WINAPI 95 flags += 1 << 10; 96#endif 97#ifdef BUILDFIXED 98 flags += 1 << 12; 99#endif 100#ifdef DYNAMIC_CRC_TABLE 101 flags += 1 << 13; 102#endif 103#ifdef NO_GZCOMPRESS 104 flags += 1L << 16; 105#endif 106#ifdef NO_GZIP 107 flags += 1L << 17; 108#endif 109#ifdef PKZIP_BUG_WORKAROUND 110 flags += 1L << 20; 111#endif 112#ifdef FASTEST 113 flags += 1L << 21; 114#endif 115#ifdef STDC 116# ifdef NO_vsnprintf 117 flags += 1L << 25; 118# ifdef HAS_vsprintf_void 119 flags += 1L << 26; 120# endif 121# else 122# ifdef HAS_vsnprintf_void 123 flags += 1L << 26; 124# endif 125# endif 126#else 127 flags += 1L << 24; 128# ifdef NO_snprintf 129 flags += 1L << 25; 130# ifdef HAS_sprintf_void 131 flags += 1L << 26; 132# endif 133# else 134# ifdef HAS_snprintf_void 135 flags += 1L << 26; 136# endif 137# endif 138#endif 139 return flags; 140} 141 142#ifdef DEBUG 143 144# ifndef verbose 145# define verbose 0 146# endif 147int z_verbose = verbose; 148 149void z_error (m) 150 char *m; 151{ 152 fprintf(stderr, "%s\n", m); 153 exit(1); 154} 155#endif 156 157/* exported to allow conversion of error code to string for compress() and 158 * uncompress() 159 */ 160const char * ZEXPORT zError(err) 161 int err; 162{ 163 return ERR_MSG(err); 164} 165 166#if defined(_WIN32_WCE) 167 /* The Microsoft C Run-Time Library for Windows CE doesn't have 168 * errno. We define it as a global variable to simplify porting. 169 * Its value is always 0 and should not be used. 170 */ 171 int errno = 0; 172#endif 173 174#ifndef HAVE_MEMCPY 175 176void zmemcpy(dest, source, len) 177 Bytef* dest; 178 const Bytef* source; 179 uInt len; 180{ 181 if (len == 0) return; 182 do { 183 *dest++ = *source++; /* ??? to be unrolled */ 184 } while (--len != 0); 185} 186 187int zmemcmp(s1, s2, len) 188 const Bytef* s1; 189 const Bytef* s2; 190 uInt len; 191{ 192 uInt j; 193 194 for (j = 0; j < len; j++) { 195 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; 196 } 197 return 0; 198} 199 200void zmemzero(dest, len) 201 Bytef* dest; 202 uInt len; 203{ 204 if (len == 0) return; 205 do { 206 *dest++ = 0; /* ??? to be unrolled */ 207 } while (--len != 0); 208} 209#endif 210 211#ifndef NO_ZCFUNCS 212 213#ifdef SYS16BIT 214 215#ifdef __TURBOC__ 216/* Turbo C in 16-bit mode */ 217 218# define MY_ZCALLOC 219 220/* Turbo C malloc() does not allow dynamic allocation of 64K bytes 221 * and farmalloc(64K) returns a pointer with an offset of 8, so we 222 * must fix the pointer. Warning: the pointer must be put back to its 223 * original form in order to free it, use zcfree(). 224 */ 225 226#define MAX_PTR 10 227/* 10*64K = 640K */ 228 229local int next_ptr = 0; 230 231typedef struct ptr_table_s { 232 voidpf org_ptr; 233 voidpf new_ptr; 234} ptr_table; 235 236local ptr_table table[MAX_PTR]; 237/* This table is used to remember the original form of pointers 238 * to large buffers (64K). Such pointers are normalized with a zero offset. 239 * Since MSDOS is not a preemptive multitasking OS, this table is not 240 * protected from concurrent access. This hack doesn't work anyway on 241 * a protected system like OS/2. Use Microsoft C instead. 242 */ 243 244voidpf zcalloc (voidpf opaque, unsigned items, unsigned size) 245{ 246 voidpf buf = opaque; /* just to make some compilers happy */ 247 ulg bsize = (ulg)items*size; 248 249 /* If we allocate less than 65520 bytes, we assume that farmalloc 250 * will return a usable pointer which doesn't have to be normalized. 251 */ 252 if (bsize < 65520L) { 253 buf = farmalloc(bsize); 254 if (*(ush*)&buf != 0) return buf; 255 } else { 256 buf = farmalloc(bsize + 16L); 257 } 258 if (buf == NULL || next_ptr >= MAX_PTR) return NULL; 259 table[next_ptr].org_ptr = buf; 260 261 /* Normalize the pointer to seg:0 */ 262 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; 263 *(ush*)&buf = 0; 264 table[next_ptr++].new_ptr = buf; 265 return buf; 266} 267 268void zcfree (voidpf opaque, voidpf ptr) 269{ 270 int n; 271 if (*(ush*)&ptr != 0) { /* object < 64K */ 272 farfree(ptr); 273 return; 274 } 275 /* Find the original pointer */ 276 for (n = 0; n < next_ptr; n++) { 277 if (ptr != table[n].new_ptr) continue; 278 279 farfree(table[n].org_ptr); 280 while (++n < next_ptr) { 281 table[n-1] = table[n]; 282 } 283 next_ptr--; 284 return; 285 } 286 ptr = opaque; /* just to make some compilers happy */ 287 Assert(0, "zcfree: ptr not found"); 288} 289 290#endif /* __TURBOC__ */ 291 292 293#ifdef M_I86 294/* Microsoft C in 16-bit mode */ 295 296# define MY_ZCALLOC 297 298#if (!defined(_MSC_VER) || (_MSC_VER <= 600)) 299# define _halloc halloc 300# define _hfree hfree 301#endif 302 303voidpf zcalloc (voidpf opaque, unsigned items, unsigned size) 304{ 305 if (opaque) opaque = 0; /* to make compiler happy */ 306 return _halloc((long)items, size); 307} 308 309void zcfree (voidpf opaque, voidpf ptr) 310{ 311 if (opaque) opaque = 0; /* to make compiler happy */ 312 _hfree(ptr); 313} 314 315#endif /* M_I86 */ 316 317#endif /* SYS16BIT */ 318 319 320#ifndef MY_ZCALLOC /* Any system without a special alloc function */ 321 322#ifndef STDC 323extern voidp malloc OF((uInt size)); 324extern voidp calloc OF((uInt items, uInt size)); 325extern void free OF((voidpf ptr)); 326#endif 327 328voidpf zcalloc (opaque, items, size) 329 voidpf opaque; 330 unsigned items; 331 unsigned size; 332{ 333 if (opaque) items += size - size; /* make compiler happy */ 334 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : 335 (voidpf)calloc(items, size); 336} 337 338void zcfree (opaque, ptr) 339 voidpf opaque; 340 voidpf ptr; 341{ 342 free(ptr); 343 if (opaque) return; /* make compiler happy */ 344} 345 346#endif /* MY_ZCALLOC */ 347 348#endif /* NO_CZFUNCS */ 349