1 /* zutil.c -- target dependent utility functions for the compression library 2 * Copyright (C) 1995-2005, 2010, 2011, 2012 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 NO_DUMMY_DECL 14 struct internal_state {int dummy;}; /* for buggy compilers */ 15 #endif 16 17 z_const char * const z_errmsg[10] = { 18 "need dictionary", /* Z_NEED_DICT 2 */ 19 "stream end", /* Z_STREAM_END 1 */ 20 "", /* Z_OK 0 */ 21 "file error", /* Z_ERRNO (-1) */ 22 "stream error", /* Z_STREAM_ERROR (-2) */ 23 "data error", /* Z_DATA_ERROR (-3) */ 24 "insufficient memory", /* Z_MEM_ERROR (-4) */ 25 "buffer error", /* Z_BUF_ERROR (-5) */ 26 "incompatible version",/* Z_VERSION_ERROR (-6) */ 27 ""}; 28 29 30 const char * ZEXPORT zlibVersion() 31 { 32 return ZLIB_VERSION; 33 } 34 35 uLong ZEXPORT zlibCompileFlags() 36 { 37 uLong flags; 38 39 flags = 0; 40 switch ((int)(sizeof(uInt))) { 41 case 2: break; 42 case 4: flags += 1; break; 43 case 8: flags += 2; break; 44 default: flags += 3; 45 } 46 switch ((int)(sizeof(uLong))) { 47 case 2: break; 48 case 4: flags += 1 << 2; break; 49 case 8: flags += 2 << 2; break; 50 default: flags += 3 << 2; 51 } 52 switch ((int)(sizeof(voidpf))) { 53 case 2: break; 54 case 4: flags += 1 << 4; break; 55 case 8: flags += 2 << 4; break; 56 default: flags += 3 << 4; 57 } 58 switch ((int)(sizeof(z_off_t))) { 59 case 2: break; 60 case 4: flags += 1 << 6; break; 61 case 8: flags += 2 << 6; break; 62 default: flags += 3 << 6; 63 } 64 #ifdef DEBUG 65 flags += 1 << 8; 66 #endif 67 #if defined(ASMV) || defined(ASMINF) 68 flags += 1 << 9; 69 #endif 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 DEBUG 119 120 # 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) 143 /* The 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 = opaque; /* just to make some compilers happy */ 223 ulg bsize = (ulg)items*size; 224 225 /* If we allocate less than 65520 bytes, we assume that farmalloc 226 * will return a usable pointer which doesn't have to be normalized. 227 */ 228 if (bsize < 65520L) { 229 buf = farmalloc(bsize); 230 if (*(ush*)&buf != 0) return buf; 231 } else { 232 buf = farmalloc(bsize + 16L); 233 } 234 if (buf == NULL || next_ptr >= MAX_PTR) return NULL; 235 table[next_ptr].org_ptr = buf; 236 237 /* Normalize the pointer to seg:0 */ 238 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; 239 *(ush*)&buf = 0; 240 table[next_ptr++].new_ptr = buf; 241 return buf; 242 } 243 244 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr) 245 { 246 int n; 247 if (*(ush*)&ptr != 0) { /* object < 64K */ 248 farfree(ptr); 249 return; 250 } 251 /* Find the original pointer */ 252 for (n = 0; n < next_ptr; n++) { 253 if (ptr != table[n].new_ptr) continue; 254 255 farfree(table[n].org_ptr); 256 while (++n < next_ptr) { 257 table[n-1] = table[n]; 258 } 259 next_ptr--; 260 return; 261 } 262 ptr = opaque; /* just to make some compilers happy */ 263 Assert(0, "zcfree: ptr not found"); 264 } 265 266 #endif /* __TURBOC__ */ 267 268 269 #ifdef M_I86 270 /* Microsoft C in 16-bit mode */ 271 272 # define MY_ZCALLOC 273 274 #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) 275 # define _halloc halloc 276 # define _hfree hfree 277 #endif 278 279 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size) 280 { 281 if (opaque) opaque = 0; /* to make compiler happy */ 282 return _halloc((long)items, size); 283 } 284 285 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr) 286 { 287 if (opaque) opaque = 0; /* to make compiler happy */ 288 _hfree(ptr); 289 } 290 291 #endif /* M_I86 */ 292 293 #endif /* SYS16BIT */ 294 295 296 #ifndef MY_ZCALLOC /* Any system without a special alloc function */ 297 298 #ifndef STDC 299 extern voidp malloc OF((uInt size)); 300 extern voidp calloc OF((uInt items, uInt size)); 301 extern void free OF((voidpf ptr)); 302 #endif 303 304 voidpf ZLIB_INTERNAL zcalloc (opaque, items, size) 305 voidpf opaque; 306 unsigned items; 307 unsigned size; 308 { 309 if (opaque) items += size - size; /* make compiler happy */ 310 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : 311 (voidpf)calloc(items, size); 312 } 313 314 void ZLIB_INTERNAL zcfree (opaque, ptr) 315 voidpf opaque; 316 voidpf ptr; 317 { 318 free(ptr); 319 if (opaque) return; /* make compiler happy */ 320 } 321 322 #endif /* MY_ZCALLOC */ 323 324 #endif /* !Z_SOLO */ 325