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 #ifndef Z_SOLO 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 return ZLIB_VERSION; 27 } 28 29 uLong ZEXPORT zlibCompileFlags(void) { 30 uLong flags; 31 32 flags = 0; 33 switch ((int)(sizeof(uInt))) { 34 case 2: break; 35 case 4: flags += 1; break; 36 case 8: flags += 2; break; 37 default: flags += 3; 38 } 39 switch ((int)(sizeof(uLong))) { 40 case 2: break; 41 case 4: flags += 1 << 2; break; 42 case 8: flags += 2 << 2; break; 43 default: flags += 3 << 2; 44 } 45 switch ((int)(sizeof(voidpf))) { 46 case 2: break; 47 case 4: flags += 1 << 4; break; 48 case 8: flags += 2 << 4; break; 49 default: flags += 3 << 4; 50 } 51 switch ((int)(sizeof(z_off_t))) { 52 case 2: break; 53 case 4: flags += 1 << 6; break; 54 case 8: flags += 2 << 6; break; 55 default: flags += 3 << 6; 56 } 57 #ifdef ZLIB_DEBUG 58 flags += 1 << 8; 59 #endif 60 /* 61 #if defined(ASMV) || defined(ASMINF) 62 flags += 1 << 9; 63 #endif 64 */ 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(char *m) { 121 fprintf(stderr, "%s\n", m); 122 exit(1); 123 } 124 #endif 125 126 /* exported to allow conversion of error code to string for compress() and 127 * uncompress() 128 */ 129 const char * ZEXPORT zError(int err) { 130 return ERR_MSG(err); 131 } 132 133 #if defined(_WIN32_WCE) && _WIN32_WCE < 0x800 134 /* The older Microsoft C Run-Time Library for Windows CE doesn't have 135 * errno. We define it as a global variable to simplify porting. 136 * Its value is always 0 and should not be used. 137 */ 138 int errno = 0; 139 #endif 140 141 #ifndef HAVE_MEMCPY 142 143 void ZLIB_INTERNAL zmemcpy(Bytef* dest, const Bytef* source, uInt len) { 144 if (len == 0) return; 145 do { 146 *dest++ = *source++; /* ??? to be unrolled */ 147 } while (--len != 0); 148 } 149 150 int ZLIB_INTERNAL zmemcmp(const Bytef* s1, const Bytef* s2, uInt len) { 151 uInt j; 152 153 for (j = 0; j < len; j++) { 154 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; 155 } 156 return 0; 157 } 158 159 void ZLIB_INTERNAL zmemzero(Bytef* dest, uInt len) { 160 if (len == 0) return; 161 do { 162 *dest++ = 0; /* ??? to be unrolled */ 163 } while (--len != 0); 164 } 165 #endif 166 167 #ifndef Z_SOLO 168 169 #ifdef SYS16BIT 170 171 #ifdef __TURBOC__ 172 /* Turbo C in 16-bit mode */ 173 174 # define MY_ZCALLOC 175 176 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes 177 * and farmalloc(64K) returns a pointer with an offset of 8, so we 178 * must fix the pointer. Warning: the pointer must be put back to its 179 * original form in order to free it, use zcfree(). 180 */ 181 182 #define MAX_PTR 10 183 /* 10*64K = 640K */ 184 185 local int next_ptr = 0; 186 187 typedef struct ptr_table_s { 188 voidpf org_ptr; 189 voidpf new_ptr; 190 } ptr_table; 191 192 local ptr_table table[MAX_PTR]; 193 /* This table is used to remember the original form of pointers 194 * to large buffers (64K). Such pointers are normalized with a zero offset. 195 * Since MSDOS is not a preemptive multitasking OS, this table is not 196 * protected from concurrent access. This hack doesn't work anyway on 197 * a protected system like OS/2. Use Microsoft C instead. 198 */ 199 200 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) { 201 voidpf buf; 202 ulg bsize = (ulg)items*size; 203 204 (void)opaque; 205 206 /* If we allocate less than 65520 bytes, we assume that farmalloc 207 * will return a usable pointer which doesn't have to be normalized. 208 */ 209 if (bsize < 65520L) { 210 buf = farmalloc(bsize); 211 if (*(ush*)&buf != 0) return buf; 212 } else { 213 buf = farmalloc(bsize + 16L); 214 } 215 if (buf == NULL || next_ptr >= MAX_PTR) return NULL; 216 table[next_ptr].org_ptr = buf; 217 218 /* Normalize the pointer to seg:0 */ 219 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; 220 *(ush*)&buf = 0; 221 table[next_ptr++].new_ptr = buf; 222 return buf; 223 } 224 225 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) { 226 int n; 227 228 (void)opaque; 229 230 if (*(ush*)&ptr != 0) { /* object < 64K */ 231 farfree(ptr); 232 return; 233 } 234 /* Find the original pointer */ 235 for (n = 0; n < next_ptr; n++) { 236 if (ptr != table[n].new_ptr) continue; 237 238 farfree(table[n].org_ptr); 239 while (++n < next_ptr) { 240 table[n-1] = table[n]; 241 } 242 next_ptr--; 243 return; 244 } 245 Assert(0, "zcfree: ptr not found"); 246 } 247 248 #endif /* __TURBOC__ */ 249 250 251 #ifdef M_I86 252 /* Microsoft C in 16-bit mode */ 253 254 # define MY_ZCALLOC 255 256 #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) 257 # define _halloc halloc 258 # define _hfree hfree 259 #endif 260 261 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, uInt items, uInt size) { 262 (void)opaque; 263 return _halloc((long)items, size); 264 } 265 266 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) { 267 (void)opaque; 268 _hfree(ptr); 269 } 270 271 #endif /* M_I86 */ 272 273 #endif /* SYS16BIT */ 274 275 276 #ifndef MY_ZCALLOC /* Any system without a special alloc function */ 277 278 #ifndef STDC 279 extern voidp malloc(uInt size); 280 extern voidp calloc(uInt items, uInt size); 281 extern void free(voidpf ptr); 282 #endif 283 284 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) { 285 (void)opaque; 286 if (items == 0 || size == 0) 287 return (NULL); 288 return reallocarray(NULL, items, size); 289 } 290 291 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) { 292 (void)opaque; 293 free(ptr); 294 } 295 296 #endif /* MY_ZCALLOC */ 297 298 #endif /* !Z_SOLO */ 299