1 /* zutil.c -- target dependent utility functions for the compression library 2 * Copyright (C) 1995-2017 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 10 z_const char * const z_errmsg[10] = { 11 (z_const char *)"need dictionary", /* Z_NEED_DICT 2 */ 12 (z_const char *)"stream end", /* Z_STREAM_END 1 */ 13 (z_const char *)"", /* Z_OK 0 */ 14 (z_const char *)"file error", /* Z_ERRNO (-1) */ 15 (z_const char *)"stream error", /* Z_STREAM_ERROR (-2) */ 16 (z_const char *)"data error", /* Z_DATA_ERROR (-3) */ 17 (z_const char *)"insufficient memory", /* Z_MEM_ERROR (-4) */ 18 (z_const char *)"buffer error", /* Z_BUF_ERROR (-5) */ 19 (z_const char *)"incompatible version",/* Z_VERSION_ERROR (-6) */ 20 (z_const char *)"" 21 }; 22 23 24 const char * ZEXPORT zlibVersion() 25 { 26 return ZLIB_VERSION; 27 } 28 29 uLong ZEXPORT zlibCompileFlags() 30 { 31 uLong flags; 32 33 flags = 0; 34 switch ((int)(sizeof(uInt))) { 35 case 2: break; 36 case 4: flags += 1; break; 37 case 8: flags += 2; break; 38 default: flags += 3; 39 } 40 switch ((int)(sizeof(uLong))) { 41 case 2: break; 42 case 4: flags += 1 << 2; break; 43 case 8: flags += 2 << 2; break; 44 default: flags += 3 << 2; 45 } 46 switch ((int)(sizeof(voidpf))) { 47 case 2: break; 48 case 4: flags += 1 << 4; break; 49 case 8: flags += 2 << 4; break; 50 default: flags += 3 << 4; 51 } 52 switch ((int)(sizeof(z_off_t))) { 53 case 2: break; 54 case 4: flags += 1 << 6; break; 55 case 8: flags += 2 << 6; break; 56 default: flags += 3 << 6; 57 } 58 #ifdef ZLIB_DEBUG 59 flags += 1 << 8; 60 #endif 61 #if defined(ASMV) || defined(ASMINF) 62 flags += 1 << 9; 63 #endif 64 #ifdef ZLIB_WINAPI 65 flags += 1 << 10; 66 #endif 67 #ifdef BUILDFIXED 68 flags += 1 << 12; 69 #endif 70 #ifdef DYNAMIC_CRC_TABLE 71 flags += 1 << 13; 72 #endif 73 #ifdef NO_GZCOMPRESS 74 flags += 1L << 16; 75 #endif 76 #ifdef NO_GZIP 77 flags += 1L << 17; 78 #endif 79 #ifdef PKZIP_BUG_WORKAROUND 80 flags += 1L << 20; 81 #endif 82 #ifdef FASTEST 83 flags += 1L << 21; 84 #endif 85 #if defined(STDC) || defined(Z_HAVE_STDARG_H) 86 # ifdef NO_vsnprintf 87 flags += 1L << 25; 88 # ifdef HAS_vsprintf_void 89 flags += 1L << 26; 90 # endif 91 # else 92 # ifdef HAS_vsnprintf_void 93 flags += 1L << 26; 94 # endif 95 # endif 96 #else 97 flags += 1L << 24; 98 # ifdef NO_snprintf 99 flags += 1L << 25; 100 # ifdef HAS_sprintf_void 101 flags += 1L << 26; 102 # endif 103 # else 104 # ifdef HAS_snprintf_void 105 flags += 1L << 26; 106 # endif 107 # endif 108 #endif 109 return flags; 110 } 111 112 #ifdef ZLIB_DEBUG 113 #include <stdlib.h> 114 # ifndef verbose 115 # define verbose 0 116 # endif 117 int ZLIB_INTERNAL z_verbose = verbose; 118 119 void ZLIB_INTERNAL z_error (m) 120 char *m; 121 { 122 fprintf(stderr, "%s\n", m); 123 exit(1); 124 } 125 #endif 126 127 /* exported to allow conversion of error code to string for compress() and 128 * uncompress() 129 */ 130 const char * ZEXPORT zError(err) 131 int err; 132 { 133 return ERR_MSG(err); 134 } 135 136 #if defined(_WIN32_WCE) 137 /* The Microsoft C Run-Time Library for Windows CE doesn't have 138 * errno. We define it as a global variable to simplify porting. 139 * Its value is always 0 and should not be used. 140 */ 141 int errno = 0; 142 #endif 143 144 #ifndef HAVE_MEMCPY 145 146 void ZLIB_INTERNAL zmemcpy(dest, source, len) 147 Bytef* dest; 148 const Bytef* source; 149 uInt len; 150 { 151 if (len == 0) return; 152 do { 153 *dest++ = *source++; /* ??? to be unrolled */ 154 } while (--len != 0); 155 } 156 157 int ZLIB_INTERNAL zmemcmp(s1, s2, len) 158 const Bytef* s1; 159 const Bytef* s2; 160 uInt len; 161 { 162 uInt j; 163 164 for (j = 0; j < len; j++) { 165 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; 166 } 167 return 0; 168 } 169 170 void ZLIB_INTERNAL zmemzero(dest, len) 171 Bytef* dest; 172 uInt len; 173 { 174 if (len == 0) return; 175 do { 176 *dest++ = 0; /* ??? to be unrolled */ 177 } while (--len != 0); 178 } 179 #endif 180 181 #ifndef Z_SOLO 182 183 #ifdef SYS16BIT 184 185 #ifdef __TURBOC__ 186 /* Turbo C in 16-bit mode */ 187 188 # define MY_ZCALLOC 189 190 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes 191 * and farmalloc(64K) returns a pointer with an offset of 8, so we 192 * must fix the pointer. Warning: the pointer must be put back to its 193 * original form in order to free it, use zcfree(). 194 */ 195 196 #define MAX_PTR 10 197 /* 10*64K = 640K */ 198 199 local int next_ptr = 0; 200 201 typedef struct ptr_table_s { 202 voidpf org_ptr; 203 voidpf new_ptr; 204 } ptr_table; 205 206 local ptr_table table[MAX_PTR]; 207 /* This table is used to remember the original form of pointers 208 * to large buffers (64K). Such pointers are normalized with a zero offset. 209 * Since MSDOS is not a preemptive multitasking OS, this table is not 210 * protected from concurrent access. This hack doesn't work anyway on 211 * a protected system like OS/2. Use Microsoft C instead. 212 */ 213 214 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size) 215 { 216 voidpf buf; 217 ulg bsize = (ulg)items*size; 218 219 (void)opaque; 220 221 /* If we allocate less than 65520 bytes, we assume that farmalloc 222 * will return a usable pointer which doesn't have to be normalized. 223 */ 224 if (bsize < 65520L) { 225 buf = farmalloc(bsize); 226 if (*(ush*)&buf != 0) return buf; 227 } else { 228 buf = farmalloc(bsize + 16L); 229 } 230 if (buf == NULL || next_ptr >= MAX_PTR) return NULL; 231 table[next_ptr].org_ptr = buf; 232 233 /* Normalize the pointer to seg:0 */ 234 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; 235 *(ush*)&buf = 0; 236 table[next_ptr++].new_ptr = buf; 237 return buf; 238 } 239 240 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr) 241 { 242 int n; 243 244 (void)opaque; 245 246 if (*(ush*)&ptr != 0) { /* object < 64K */ 247 farfree(ptr); 248 return; 249 } 250 /* Find the original pointer */ 251 for (n = 0; n < next_ptr; n++) { 252 if (ptr != table[n].new_ptr) continue; 253 254 farfree(table[n].org_ptr); 255 while (++n < next_ptr) { 256 table[n-1] = table[n]; 257 } 258 next_ptr--; 259 return; 260 } 261 Assert(0, "zcfree: ptr not found"); 262 } 263 264 #endif /* __TURBOC__ */ 265 266 267 #ifdef M_I86 268 /* Microsoft C in 16-bit mode */ 269 270 # define MY_ZCALLOC 271 272 #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) 273 # define _halloc halloc 274 # define _hfree hfree 275 #endif 276 277 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size) 278 { 279 (void)opaque; 280 return _halloc((long)items, size); 281 } 282 283 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr) 284 { 285 (void)opaque; 286 _hfree(ptr); 287 } 288 289 #endif /* M_I86 */ 290 291 #endif /* SYS16BIT */ 292 293 294 #ifndef MY_ZCALLOC /* Any system without a special alloc function */ 295 296 #ifndef STDC 297 extern voidp malloc OF((uInt size)); 298 extern voidp calloc OF((uInt items, uInt size)); 299 extern void free OF((voidpf ptr)); 300 #endif 301 302 voidpf ZLIB_INTERNAL zcalloc (opaque, items, size) 303 voidpf opaque; 304 unsigned items; 305 unsigned size; 306 { 307 (void)opaque; 308 #if 0 309 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : 310 (voidpf)calloc(items, size); 311 #else 312 return AllocatePool (items * size); 313 #endif 314 } 315 316 void ZLIB_INTERNAL zcfree (opaque, ptr) 317 voidpf opaque; 318 voidpf ptr; 319 { 320 (void)opaque; 321 #if 0 322 free(ptr); 323 #else 324 FreePool (ptr); 325 #endif 326 } 327 328 #endif /* MY_ZCALLOC */ 329 330 #endif /* !Z_SOLO */ 331
