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