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 #if !defined(Z_SOLO) && !defined(_KERNEL) 8 # include "gzguts.h" 9 #endif 10 11 z_const char * const z_errmsg[10] = { 12 (z_const char *)"need dictionary", /* Z_NEED_DICT 2 */ 13 (z_const char *)"stream end", /* Z_STREAM_END 1 */ 14 (z_const char *)"", /* Z_OK 0 */ 15 (z_const char *)"file error", /* Z_ERRNO (-1) */ 16 (z_const char *)"stream error", /* Z_STREAM_ERROR (-2) */ 17 (z_const char *)"data error", /* Z_DATA_ERROR (-3) */ 18 (z_const char *)"insufficient memory", /* Z_MEM_ERROR (-4) */ 19 (z_const char *)"buffer error", /* Z_BUF_ERROR (-5) */ 20 (z_const char *)"incompatible version",/* Z_VERSION_ERROR (-6) */ 21 (z_const char *)"" 22 }; 23 24 25 const char * ZEXPORT zlibVersion(void) 26 { 27 return ZLIB_VERSION; 28 } 29 30 uLong ZEXPORT zlibCompileFlags(void) 31 { 32 uLong flags; 33 34 flags = 0; 35 switch ((int)(sizeof(uInt))) { 36 case 2: break; 37 case 4: flags += 1; break; 38 case 8: flags += 2; break; 39 default: flags += 3; 40 } 41 switch ((int)(sizeof(uLong))) { 42 case 2: break; 43 case 4: flags += 1 << 2; break; 44 case 8: flags += 2 << 2; break; 45 default: flags += 3 << 2; 46 } 47 switch ((int)(sizeof(voidpf))) { 48 case 2: break; 49 case 4: flags += 1 << 4; break; 50 case 8: flags += 2 << 4; break; 51 default: flags += 3 << 4; 52 } 53 switch ((int)(sizeof(z_off_t))) { 54 case 2: break; 55 case 4: flags += 1 << 6; break; 56 case 8: flags += 2 << 6; break; 57 default: flags += 3 << 6; 58 } 59 #ifdef ZLIB_DEBUG 60 flags += 1 << 8; 61 #endif 62 #if defined(ASMV) || defined(ASMINF) 63 flags += 1 << 9; 64 #endif 65 #ifdef ZLIB_WINAPI 66 flags += 1 << 10; 67 #endif 68 #ifdef BUILDFIXED 69 flags += 1 << 12; 70 #endif 71 #ifdef DYNAMIC_CRC_TABLE 72 flags += 1 << 13; 73 #endif 74 #ifdef NO_GZCOMPRESS 75 flags += 1L << 16; 76 #endif 77 #ifdef NO_GZIP 78 flags += 1L << 17; 79 #endif 80 #ifdef PKZIP_BUG_WORKAROUND 81 flags += 1L << 20; 82 #endif 83 #ifdef FASTEST 84 flags += 1L << 21; 85 #endif 86 #if defined(STDC) || defined(Z_HAVE_STDARG_H) 87 # ifdef NO_vsnprintf 88 flags += 1L << 25; 89 # ifdef HAS_vsprintf_void 90 flags += 1L << 26; 91 # endif 92 # else 93 # ifdef HAS_vsnprintf_void 94 flags += 1L << 26; 95 # endif 96 # endif 97 #else 98 flags += 1L << 24; 99 # ifdef NO_snprintf 100 flags += 1L << 25; 101 # ifdef HAS_sprintf_void 102 flags += 1L << 26; 103 # endif 104 # else 105 # ifdef HAS_snprintf_void 106 flags += 1L << 26; 107 # endif 108 # endif 109 #endif 110 return flags; 111 } 112 113 #ifdef ZLIB_DEBUG 114 #include <stdlib.h> 115 # ifndef verbose 116 # define verbose 0 117 # endif 118 int ZLIB_INTERNAL z_verbose = verbose; 119 120 void ZLIB_INTERNAL z_error (m) 121 char *m; 122 { 123 fprintf(stderr, "%s\n", m); 124 exit(1); 125 } 126 #endif 127 128 /* exported to allow conversion of error code to string for compress() and 129 * uncompress() 130 */ 131 const char * ZEXPORT zError(int err) 132 { 133 return ERR_MSG(err); 134 } 135 136 #if defined(_WIN32_WCE) && _WIN32_WCE < 0x800 137 /* The older 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 #if !defined(HAVE_MEMCPY) && !defined(_KERNEL) 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 (voidpf opaque, unsigned items, unsigned size) 303 { 304 (void)opaque; 305 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : 306 (voidpf)calloc(items, size); 307 } 308 309 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr) 310 { 311 (void)opaque; 312 free(ptr); 313 } 314 315 #endif /* MY_ZCALLOC */ 316 317 #endif /* !Z_SOLO */ 318