zutil.c (7271B)
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 #ifndef Z_FREETYPE 14 15 z_const char * const z_errmsg[10] = { 16 (z_const char *)"need dictionary", /* Z_NEED_DICT 2 */ 17 (z_const char *)"stream end", /* Z_STREAM_END 1 */ 18 (z_const char *)"", /* Z_OK 0 */ 19 (z_const char *)"file error", /* Z_ERRNO (-1) */ 20 (z_const char *)"stream error", /* Z_STREAM_ERROR (-2) */ 21 (z_const char *)"data error", /* Z_DATA_ERROR (-3) */ 22 (z_const char *)"insufficient memory", /* Z_MEM_ERROR (-4) */ 23 (z_const char *)"buffer error", /* Z_BUF_ERROR (-5) */ 24 (z_const char *)"incompatible version",/* Z_VERSION_ERROR (-6) */ 25 (z_const char *)"" 26 }; 27 28 29 const char * ZEXPORT zlibVersion(void) { 30 return ZLIB_VERSION; 31 } 32 33 uLong ZEXPORT zlibCompileFlags(void) { 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 /* 65 #if defined(ASMV) || defined(ASMINF) 66 flags += 1 << 9; 67 #endif 68 */ 69 #ifdef ZLIB_WINAPI 70 flags += 1 << 10; 71 #endif 72 #ifdef BUILDFIXED 73 flags += 1 << 12; 74 #endif 75 #ifdef DYNAMIC_CRC_TABLE 76 flags += 1 << 13; 77 #endif 78 #ifdef NO_GZCOMPRESS 79 flags += 1L << 16; 80 #endif 81 #ifdef NO_GZIP 82 flags += 1L << 17; 83 #endif 84 #ifdef PKZIP_BUG_WORKAROUND 85 flags += 1L << 20; 86 #endif 87 #ifdef FASTEST 88 flags += 1L << 21; 89 #endif 90 #if defined(STDC) || defined(Z_HAVE_STDARG_H) 91 # ifdef NO_vsnprintf 92 flags += 1L << 25; 93 # ifdef HAS_vsprintf_void 94 flags += 1L << 26; 95 # endif 96 # else 97 # ifdef HAS_vsnprintf_void 98 flags += 1L << 26; 99 # endif 100 # endif 101 #else 102 flags += 1L << 24; 103 # ifdef NO_snprintf 104 flags += 1L << 25; 105 # ifdef HAS_sprintf_void 106 flags += 1L << 26; 107 # endif 108 # else 109 # ifdef HAS_snprintf_void 110 flags += 1L << 26; 111 # endif 112 # endif 113 #endif 114 return flags; 115 } 116 117 #ifdef ZLIB_DEBUG 118 #include <stdlib.h> 119 # ifndef verbose 120 # define verbose 0 121 # endif 122 int ZLIB_INTERNAL z_verbose = verbose; 123 124 void ZLIB_INTERNAL z_error(char *m) { 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(int err) { 134 return ERR_MSG(err); 135 } 136 137 #endif /* !Z_FREETYPE */ 138 139 #if defined(_WIN32_WCE) && _WIN32_WCE < 0x800 140 /* The older 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(Bytef* dest, const Bytef* source, uInt len) { 150 if (len == 0) return; 151 do { 152 *dest++ = *source++; /* ??? to be unrolled */ 153 } while (--len != 0); 154 } 155 156 #ifndef Z_FREETYPE 157 int ZLIB_INTERNAL zmemcmp(const Bytef* s1, const Bytef* s2, uInt len) { 158 uInt j; 159 160 for (j = 0; j < len; j++) { 161 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; 162 } 163 return 0; 164 } 165 166 void ZLIB_INTERNAL zmemzero(Bytef* dest, uInt len) { 167 if (len == 0) return; 168 do { 169 *dest++ = 0; /* ??? to be unrolled */ 170 } while (--len != 0); 171 } 172 #endif /* !Z_FREETYPE */ 173 #endif 174 175 #ifndef Z_SOLO 176 177 #ifdef SYS16BIT 178 179 #ifdef __TURBOC__ 180 /* Turbo C in 16-bit mode */ 181 182 # define MY_ZCALLOC 183 184 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes 185 * and farmalloc(64K) returns a pointer with an offset of 8, so we 186 * must fix the pointer. Warning: the pointer must be put back to its 187 * original form in order to free it, use zcfree(). 188 */ 189 190 #define MAX_PTR 10 191 /* 10*64K = 640K */ 192 193 local int next_ptr = 0; 194 195 typedef struct ptr_table_s { 196 voidpf org_ptr; 197 voidpf new_ptr; 198 } ptr_table; 199 200 local ptr_table table[MAX_PTR]; 201 /* This table is used to remember the original form of pointers 202 * to large buffers (64K). Such pointers are normalized with a zero offset. 203 * Since MSDOS is not a preemptive multitasking OS, this table is not 204 * protected from concurrent access. This hack doesn't work anyway on 205 * a protected system like OS/2. Use Microsoft C instead. 206 */ 207 208 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) { 209 voidpf buf; 210 ulg bsize = (ulg)items*size; 211 212 (void)opaque; 213 214 /* If we allocate less than 65520 bytes, we assume that farmalloc 215 * will return a usable pointer which doesn't have to be normalized. 216 */ 217 if (bsize < 65520L) { 218 buf = farmalloc(bsize); 219 if (*(ush*)&buf != 0) return buf; 220 } else { 221 buf = farmalloc(bsize + 16L); 222 } 223 if (buf == NULL || next_ptr >= MAX_PTR) return NULL; 224 table[next_ptr].org_ptr = buf; 225 226 /* Normalize the pointer to seg:0 */ 227 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; 228 *(ush*)&buf = 0; 229 table[next_ptr++].new_ptr = buf; 230 return buf; 231 } 232 233 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) { 234 int n; 235 236 (void)opaque; 237 238 if (*(ush*)&ptr != 0) { /* object < 64K */ 239 farfree(ptr); 240 return; 241 } 242 /* Find the original pointer */ 243 for (n = 0; n < next_ptr; n++) { 244 if (ptr != table[n].new_ptr) continue; 245 246 farfree(table[n].org_ptr); 247 while (++n < next_ptr) { 248 table[n-1] = table[n]; 249 } 250 next_ptr--; 251 return; 252 } 253 Assert(0, "zcfree: ptr not found"); 254 } 255 256 #endif /* __TURBOC__ */ 257 258 259 #ifdef M_I86 260 /* Microsoft C in 16-bit mode */ 261 262 # define MY_ZCALLOC 263 264 #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) 265 # define _halloc halloc 266 # define _hfree hfree 267 #endif 268 269 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, uInt items, uInt size) { 270 (void)opaque; 271 return _halloc((long)items, size); 272 } 273 274 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) { 275 (void)opaque; 276 _hfree(ptr); 277 } 278 279 #endif /* M_I86 */ 280 281 #endif /* SYS16BIT */ 282 283 284 #ifndef MY_ZCALLOC /* Any system without a special alloc function */ 285 286 #ifndef STDC 287 extern voidp malloc(uInt size); 288 extern voidp calloc(uInt items, uInt size); 289 extern void free(voidpf ptr); 290 #endif 291 292 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) { 293 (void)opaque; 294 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : 295 (voidpf)calloc(items, size); 296 } 297 298 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) { 299 (void)opaque; 300 free(ptr); 301 } 302 303 #endif /* MY_ZCALLOC */ 304 305 #endif /* !Z_SOLO */