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 #include "zutil.h" 7 8 #ifndef _KERNEL 9 #ifndef Z_SOLO 10 # include "gzguts.h" 11 #endif 12 #endif 13 14 z_const char * const z_errmsg[10] = { 15 (z_const char *)"need dictionary", /* Z_NEED_DICT 2 */ 16 (z_const char *)"stream end", /* Z_STREAM_END 1 */ 17 (z_const char *)"", /* Z_OK 0 */ 18 (z_const char *)"file error", /* Z_ERRNO (-1) */ 19 (z_const char *)"stream error", /* Z_STREAM_ERROR (-2) */ 20 (z_const char *)"data error", /* Z_DATA_ERROR (-3) */ 21 (z_const char *)"insufficient memory", /* Z_MEM_ERROR (-4) */ 22 (z_const char *)"buffer error", /* Z_BUF_ERROR (-5) */ 23 (z_const char *)"incompatible version",/* Z_VERSION_ERROR (-6) */ 24 (z_const char *)"" 25 }; 26 27 28 const char * ZEXPORT zlibVersion() 29 { 30 return ZLIB_VERSION; 31 } 32 33 uLong ZEXPORT zlibCompileFlags() 34 { 35 uLong flags; 36 37 flags = 0; 38 switch ((int)(sizeof(uInt))) { 39 case 2: break; 40 case 4: flags += 1; break; 41 case 8: flags += 2; break; 42 default: flags += 3; 43 } 44 switch ((int)(sizeof(uLong))) { 45 case 2: break; 46 case 4: flags += 1 << 2; break; 47 case 8: flags += 2 << 2; break; 48 default: flags += 3 << 2; 49 } 50 switch ((int)(sizeof(voidpf))) { 51 case 2: break; 52 case 4: flags += 1 << 4; break; 53 case 8: flags += 2 << 4; break; 54 default: flags += 3 << 4; 55 } 56 switch ((int)(sizeof(z_off_t))) { 57 case 2: break; 58 case 4: flags += 1 << 6; break; 59 case 8: flags += 2 << 6; break; 60 default: flags += 3 << 6; 61 } 62 #ifdef ZLIB_DEBUG 63 flags += 1 << 8; 64 #endif 65 /* 66 #if defined(ASMV) || defined(ASMINF) 67 flags += 1 << 9; 68 #endif 69 */ 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 ZLIB_DEBUG 119 #include <stdlib.h> 120 # ifndef verbose 121 # define verbose 0 122 # endif 123 int ZLIB_INTERNAL z_verbose = verbose; 124 125 void ZLIB_INTERNAL z_error(m) 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(err) 137 int err; 138 { 139 return ERR_MSG(err); 140 } 141 142 #if defined(_WIN32_WCE) && _WIN32_WCE < 0x800 143 /* The older 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 int errno = 0; 148 #endif 149 150 #ifndef HAVE_MEMCPY 151 152 void ZLIB_INTERNAL zmemcpy(dest, source, len) 153 Bytef* dest; 154 const Bytef* source; 155 uInt len; 156 { 157 if (len == 0) return; 158 do { 159 *dest++ = *source++; /* ??? to be unrolled */ 160 } while (--len != 0); 161 } 162 163 int ZLIB_INTERNAL zmemcmp(s1, s2, len) 164 const Bytef* s1; 165 const Bytef* s2; 166 uInt len; 167 { 168 uInt j; 169 170 for (j = 0; j < len; j++) { 171 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; 172 } 173 return 0; 174 } 175 176 void ZLIB_INTERNAL zmemzero(dest, len) 177 Bytef* dest; 178 uInt len; 179 { 180 if (len == 0) return; 181 do { 182 *dest++ = 0; /* ??? to be unrolled */ 183 } while (--len != 0); 184 } 185 #endif 186 187 #ifndef Z_SOLO 188 189 #ifdef SYS16BIT 190 191 #ifdef __TURBOC__ 192 /* Turbo C in 16-bit mode */ 193 194 # define MY_ZCALLOC 195 196 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes 197 * and farmalloc(64K) returns a pointer with an offset of 8, so we 198 * must fix the pointer. Warning: the pointer must be put back to its 199 * original form in order to free it, use zcfree(). 200 */ 201 202 #define MAX_PTR 10 203 /* 10*64K = 640K */ 204 205 local int next_ptr = 0; 206 207 typedef struct ptr_table_s { 208 voidpf org_ptr; 209 voidpf new_ptr; 210 } ptr_table; 211 212 local ptr_table table[MAX_PTR]; 213 /* This table is used to remember the original form of pointers 214 * to large buffers (64K). Such pointers are normalized with a zero offset. 215 * Since MSDOS is not a preemptive multitasking OS, this table is not 216 * protected from concurrent access. This hack doesn't work anyway on 217 * a protected system like OS/2. Use Microsoft C instead. 218 */ 219 220 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) 221 { 222 voidpf buf; 223 ulg bsize = (ulg)items*size; 224 225 (void)opaque; 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; 249 250 (void)opaque; 251 252 if (*(ush*)&ptr != 0) { /* object < 64K */ 253 farfree(ptr); 254 return; 255 } 256 /* Find the original pointer */ 257 for (n = 0; n < next_ptr; n++) { 258 if (ptr != table[n].new_ptr) continue; 259 260 farfree(table[n].org_ptr); 261 while (++n < next_ptr) { 262 table[n-1] = table[n]; 263 } 264 next_ptr--; 265 return; 266 } 267 Assert(0, "zcfree: ptr not found"); 268 } 269 270 #endif /* __TURBOC__ */ 271 272 273 #ifdef M_I86 274 /* Microsoft C in 16-bit mode */ 275 276 # define MY_ZCALLOC 277 278 #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) 279 # define _halloc halloc 280 # define _hfree hfree 281 #endif 282 283 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, uInt items, uInt size) 284 { 285 (void)opaque; 286 return _halloc((long)items, size); 287 } 288 289 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) 290 { 291 (void)opaque; 292 _hfree(ptr); 293 } 294 295 #endif /* M_I86 */ 296 297 #endif /* SYS16BIT */ 298 299 300 #ifndef MY_ZCALLOC /* Any system without a special alloc function */ 301 302 #ifndef STDC 303 extern voidp malloc OF((uInt size)); 304 extern voidp calloc OF((uInt items, uInt size)); 305 extern void free OF((voidpf ptr)); 306 #endif 307 308 voidpf ZLIB_INTERNAL zcalloc(opaque, items, size) 309 voidpf opaque; 310 unsigned items; 311 unsigned size; 312 { 313 (void)opaque; 314 if (items == 0 || size == 0) 315 return (NULL); 316 return reallocarray(NULL, items, size); 317 } 318 319 void ZLIB_INTERNAL zcfree(opaque, ptr) 320 voidpf opaque; 321 voidpf ptr; 322 { 323 (void)opaque; 324 free(ptr); 325 } 326 327 #endif /* MY_ZCALLOC */ 328 329 #endif /* !Z_SOLO */ 330