zutil.c (7179B)
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(void) { 28 return ZLIB_VERSION; 29 } 30 31 uLong ZEXPORT zlibCompileFlags(void) { 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 /* 63 #if defined(ASMV) || defined(ASMINF) 64 flags += 1 << 9; 65 #endif 66 */ 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(char *m) { 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 return ERR_MSG(err); 133 } 134 135 #if defined(_WIN32_WCE) && _WIN32_WCE < 0x800 136 /* The older Microsoft C Run-Time Library for Windows CE doesn't have 137 * errno. We define it as a global variable to simplify porting. 138 * Its value is always 0 and should not be used. 139 */ 140 int errno = 0; 141 #endif 142 143 #ifndef HAVE_MEMCPY 144 145 void ZLIB_INTERNAL zmemcpy(Bytef* dest, const Bytef* source, uInt len) { 146 if (len == 0) return; 147 do { 148 *dest++ = *source++; /* ??? to be unrolled */ 149 } while (--len != 0); 150 } 151 152 int ZLIB_INTERNAL zmemcmp(const Bytef* s1, const Bytef* s2, uInt len) { 153 uInt j; 154 155 for (j = 0; j < len; j++) { 156 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; 157 } 158 return 0; 159 } 160 161 void ZLIB_INTERNAL zmemzero(Bytef* dest, uInt len) { 162 if (len == 0) return; 163 do { 164 *dest++ = 0; /* ??? to be unrolled */ 165 } while (--len != 0); 166 } 167 #endif 168 169 #ifndef Z_SOLO 170 171 #ifdef SYS16BIT 172 173 #ifdef __TURBOC__ 174 /* Turbo C in 16-bit mode */ 175 176 # define MY_ZCALLOC 177 178 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes 179 * and farmalloc(64K) returns a pointer with an offset of 8, so we 180 * must fix the pointer. Warning: the pointer must be put back to its 181 * original form in order to free it, use zcfree(). 182 */ 183 184 #define MAX_PTR 10 185 /* 10*64K = 640K */ 186 187 local int next_ptr = 0; 188 189 typedef struct ptr_table_s { 190 voidpf org_ptr; 191 voidpf new_ptr; 192 } ptr_table; 193 194 local ptr_table table[MAX_PTR]; 195 /* This table is used to remember the original form of pointers 196 * to large buffers (64K). Such pointers are normalized with a zero offset. 197 * Since MSDOS is not a preemptive multitasking OS, this table is not 198 * protected from concurrent access. This hack doesn't work anyway on 199 * a protected system like OS/2. Use Microsoft C instead. 200 */ 201 202 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) { 203 voidpf buf; 204 ulg bsize = (ulg)items*size; 205 206 (void)opaque; 207 208 /* If we allocate less than 65520 bytes, we assume that farmalloc 209 * will return a usable pointer which doesn't have to be normalized. 210 */ 211 if (bsize < 65520L) { 212 buf = farmalloc(bsize); 213 if (*(ush*)&buf != 0) return buf; 214 } else { 215 buf = farmalloc(bsize + 16L); 216 } 217 if (buf == NULL || next_ptr >= MAX_PTR) return NULL; 218 table[next_ptr].org_ptr = buf; 219 220 /* Normalize the pointer to seg:0 */ 221 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; 222 *(ush*)&buf = 0; 223 table[next_ptr++].new_ptr = buf; 224 return buf; 225 } 226 227 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) { 228 int n; 229 230 (void)opaque; 231 232 if (*(ush*)&ptr != 0) { /* object < 64K */ 233 farfree(ptr); 234 return; 235 } 236 /* Find the original pointer */ 237 for (n = 0; n < next_ptr; n++) { 238 if (ptr != table[n].new_ptr) continue; 239 240 farfree(table[n].org_ptr); 241 while (++n < next_ptr) { 242 table[n-1] = table[n]; 243 } 244 next_ptr--; 245 return; 246 } 247 Assert(0, "zcfree: ptr not found"); 248 } 249 250 #endif /* __TURBOC__ */ 251 252 253 #ifdef M_I86 254 /* Microsoft C in 16-bit mode */ 255 256 # define MY_ZCALLOC 257 258 #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) 259 # define _halloc halloc 260 # define _hfree hfree 261 #endif 262 263 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, uInt items, uInt size) { 264 (void)opaque; 265 return _halloc((long)items, size); 266 } 267 268 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) { 269 (void)opaque; 270 _hfree(ptr); 271 } 272 273 #endif /* M_I86 */ 274 275 #endif /* SYS16BIT */ 276 277 278 #ifndef MY_ZCALLOC /* Any system without a special alloc function */ 279 280 #ifndef STDC 281 extern voidp malloc(uInt size); 282 extern voidp calloc(uInt items, uInt size); 283 extern void free(voidpf ptr); 284 #endif 285 286 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) { 287 (void)opaque; 288 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : 289 (voidpf)calloc(items, size); 290 } 291 292 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) { 293 (void)opaque; 294 free(ptr); 295 } 296 297 #endif /* MY_ZCALLOC */ 298 299 #endif /* !Z_SOLO */