1 /* zutil.c -- target dependent utility functions for the compression library 2 * Copyright (C) 1995-2005, 2010, 2011, 2012 Jean-loup Gailly. 3 * For conditions of distribution and use, see copyright notice in zlib.h 4 */ 5 6 /* @(#) $Id$ */ 7 8 #include "zutil.h" 9 #ifndef Z_SOLO 10 # include "gzguts.h" 11 #endif 12 13 #ifndef NO_DUMMY_DECL 14 struct internal_state {int dummy;}; /* for buggy compilers */ 15 #endif 16 17 z_const char * const z_errmsg[10] = { 18 "need dictionary", /* Z_NEED_DICT 2 */ 19 "stream end", /* Z_STREAM_END 1 */ 20 "", /* Z_OK 0 */ 21 "file error", /* Z_ERRNO (-1) */ 22 "stream error", /* Z_STREAM_ERROR (-2) */ 23 "data error", /* Z_DATA_ERROR (-3) */ 24 "insufficient memory", /* Z_MEM_ERROR (-4) */ 25 "buffer error", /* Z_BUF_ERROR (-5) */ 26 "incompatible version",/* Z_VERSION_ERROR (-6) */ 27 ""}; 28 29 30 const char * ZEXPORT zlibVersion() 31 { 32 return ZLIB_VERSION; 33 } 34 35 uLong ZEXPORT zlibCompileFlags() 36 { 37 uLong flags; 38 39 flags = 0; 40 switch ((int)(sizeof(uInt))) { 41 case 2: break; 42 case 4: flags += 1; break; 43 case 8: flags += 2; break; 44 default: flags += 3; 45 } 46 switch ((int)(sizeof(uLong))) { 47 case 2: break; 48 case 4: flags += 1 << 2; break; 49 case 8: flags += 2 << 2; break; 50 default: flags += 3 << 2; 51 } 52 switch ((int)(sizeof(voidpf))) { 53 case 2: break; 54 case 4: flags += 1 << 4; break; 55 case 8: flags += 2 << 4; break; 56 default: flags += 3 << 4; 57 } 58 switch ((int)(sizeof(z_off_t))) { 59 case 2: break; 60 case 4: flags += 1 << 6; break; 61 case 8: flags += 2 << 6; break; 62 default: flags += 3 << 6; 63 } 64 #ifdef DEBUG 65 flags += 1 << 8; 66 #endif 67 #if defined(ASMV) || defined(ASMINF) 68 flags += 1 << 9; 69 #endif 70 #ifdef ZLIB_WINAPI 71 flags += 1 << 10; 72 #endif 73 #ifdef BUILDFIXED 74 flags += 1 << 12; 75 #endif 76 #ifdef DYNAMIC_CRC_TABLE 77 flags += 1 << 13; 78 #endif 79 #ifdef NO_GZCOMPRESS 80 flags += 1L << 16; 81 #endif 82 #ifdef NO_GZIP 83 flags += 1L << 17; 84 #endif 85 #ifdef PKZIP_BUG_WORKAROUND 86 flags += 1L << 20; 87 #endif 88 #ifdef FASTEST 89 flags += 1L << 21; 90 #endif 91 #if defined(STDC) || defined(Z_HAVE_STDARG_H) 92 # ifdef NO_vsnprintf 93 flags += 1L << 25; 94 # ifdef HAS_vsprintf_void 95 flags += 1L << 26; 96 # endif 97 # else 98 # ifdef HAS_vsnprintf_void 99 flags += 1L << 26; 100 # endif 101 # endif 102 #else 103 flags += 1L << 24; 104 # ifdef NO_snprintf 105 flags += 1L << 25; 106 # ifdef HAS_sprintf_void 107 flags += 1L << 26; 108 # endif 109 # else 110 # ifdef HAS_snprintf_void 111 flags += 1L << 26; 112 # endif 113 # endif 114 #endif 115 return flags; 116 } 117 118 #ifdef DEBUG 119 120 # ifndef verbose 121 # define verbose 0 122 # endif 123 int ZLIB_INTERNAL z_verbose = verbose; 124 125 void ZLIB_INTERNAL z_error ( 126 char *m) 127 { 128 fprintf(stderr, "%s\n", m); 129 exit(1); 130 } 131 #endif 132 133 /* exported to allow conversion of error code to string for compress() and 134 * uncompress() 135 */ 136 const char * ZEXPORT zError( 137 int err) 138 { 139 return ERR_MSG(err); 140 } 141 142 #if defined(_WIN32_WCE) 143 /* The Microsoft C Run-Time Library for Windows CE doesn't have 144 * errno. We define it as a global variable to simplify porting. 145 * Its value is always 0 and should not be used. 146 */ 147 /* does not exist on WCE. XYQ: and we don't need it! */ 148 /*int errno = 0;*/ 149 #endif 150 151 #ifndef HAVE_MEMCPY 152 153 void ZLIB_INTERNAL zmemcpy( 154 Bytef* dest, 155 const Bytef* source, 156 uInt len) 157 { 158 if (len == 0) return; 159 do { 160 *dest++ = *source++; /* ??? to be unrolled */ 161 } while (--len != 0); 162 } 163 164 int ZLIB_INTERNAL zmemcmp( 165 const Bytef* s1, 166 const Bytef* s2, 167 uInt len) 168 { 169 uInt j; 170 171 for (j = 0; j < len; j++) { 172 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; 173 } 174 return 0; 175 } 176 177 void ZLIB_INTERNAL zmemzero( 178 Bytef* dest, 179 uInt len) 180 { 181 if (len == 0) return; 182 do { 183 *dest++ = 0; /* ??? to be unrolled */ 184 } while (--len != 0); 185 } 186 #endif 187 188 #if 0 189 #ifndef Z_SOLO 190 191 #ifdef SYS16BIT 192 193 #ifdef __TURBOC__ 194 /* Turbo C in 16-bit mode */ 195 196 # define MY_ZCALLOC 197 198 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes 199 * and farmalloc(64K) returns a pointer with an offset of 8, so we 200 * must fix the pointer. Warning: the pointer must be put back to its 201 * original form in order to free it, use zcfree(). 202 */ 203 204 #define MAX_PTR 10 205 /* 10*64K = 640K */ 206 207 local int next_ptr = 0; 208 209 typedef struct ptr_table_s { 210 voidpf org_ptr; 211 voidpf new_ptr; 212 } ptr_table; 213 214 local ptr_table table[MAX_PTR]; 215 /* This table is used to remember the original form of pointers 216 * to large buffers (64K). Such pointers are normalized with a zero offset. 217 * Since MSDOS is not a preemptive multitasking OS, this table is not 218 * protected from concurrent access. This hack doesn't work anyway on 219 * a protected system like OS/2. Use Microsoft C instead. 220 */ 221 222 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size) 223 { 224 voidpf buf = opaque; /* just to make some compilers happy */ 225 ulg bsize = (ulg)items*size; 226 227 /* If we allocate less than 65520 bytes, we assume that farmalloc 228 * will return a usable pointer which doesn't have to be normalized. 229 */ 230 if (bsize < 65520L) { 231 buf = farmalloc(bsize); 232 if (*(ush*)&buf != 0) return buf; 233 } else { 234 buf = farmalloc(bsize + 16L); 235 } 236 if (buf == NULL || next_ptr >= MAX_PTR) return NULL; 237 table[next_ptr].org_ptr = buf; 238 239 /* Normalize the pointer to seg:0 */ 240 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; 241 *(ush*)&buf = 0; 242 table[next_ptr++].new_ptr = buf; 243 return buf; 244 } 245 246 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr) 247 { 248 int n; 249 if (*(ush*)&ptr != 0) { /* object < 64K */ 250 farfree(ptr); 251 return; 252 } 253 /* Find the original pointer */ 254 for (n = 0; n < next_ptr; n++) { 255 if (ptr != table[n].new_ptr) continue; 256 257 farfree(table[n].org_ptr); 258 while (++n < next_ptr) { 259 table[n-1] = table[n]; 260 } 261 next_ptr--; 262 return; 263 } 264 ptr = opaque; /* just to make some compilers happy */ 265 Assert(0, "zcfree: ptr not found"); 266 } 267 268 #endif /* __TURBOC__ */ 269 270 271 #ifdef M_I86 272 /* Microsoft C in 16-bit mode */ 273 274 # define MY_ZCALLOC 275 276 #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) 277 # define _halloc halloc 278 # define _hfree hfree 279 #endif 280 281 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size) 282 { 283 if (opaque) opaque = 0; /* to make compiler happy */ 284 return _halloc((long)items, size); 285 } 286 287 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr) 288 { 289 if (opaque) opaque = 0; /* to make compiler happy */ 290 _hfree(ptr); 291 } 292 293 #endif /* M_I86 */ 294 295 #endif /* SYS16BIT */ 296 297 298 #ifndef MY_ZCALLOC /* Any system without a special alloc function */ 299 300 #ifndef STDC 301 extern voidp malloc OF((uInt size)); 302 extern voidp calloc OF((uInt items, uInt size)); 303 extern void free OF((voidpf ptr)); 304 #endif 305 306 voidpf ZLIB_INTERNAL zcalloc (opaque, items, size) 307 voidpf opaque; 308 unsigned items; 309 unsigned size; 310 { 311 if (opaque) items += size - size; /* make compiler happy */ 312 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : 313 (voidpf)calloc(items, size); 314 } 315 316 void ZLIB_INTERNAL zcfree (opaque, ptr) 317 voidpf opaque; 318 voidpf ptr; 319 { 320 free(ptr); 321 if (opaque) return; /* make compiler happy */ 322 } 323 324 #endif /* MY_ZCALLOC */ 325 326 #endif /* !Z_SOLO */ 327 #endif /* 0 */ 328 329 #if defined(_FX_MANAGED_CODE_) && defined(__cplusplus) 330 extern "C" { 331 #endif 332 333 extern void* FXMEM_DefaultAlloc(size_t, int); 334 extern void FXMEM_DefaultFree(void*, int); 335 336 #if defined(_FX_MANAGED_CODE_) && defined(__cplusplus) 337 } 338 #endif 339 340 /* XYQ 2007-1-19 */ 341 voidpf zcalloc(voidpf opaque, unsigned items, unsigned size) 342 { 343 return FXMEM_DefaultAlloc(items * size, 0); 344 } 345 346 void zcfree(voidpf opaque, voidpf ptr) 347 { 348 FXMEM_DefaultFree(ptr, 0); 349 } 350
