1 // SPDX-License-Identifier: Zlib 2 /* zutil.c -- target dependent utility functions for the compression library 3 * Copyright (C) 1995-2017 Jean-loup Gailly 4 * For conditions of distribution and use, see copyright notice in zlib.h 5 */ 6 7 /* @(#) $Id$ */ 8 9 #include "zutil.h" 10 #ifndef Z_SOLO 11 # include "gzguts.h" 12 #endif 13 14 z_const char * const z_errmsg[10] = { 15 (z_const char *)"need dictionary", /* Z_NEED_DICT 2 */ 16 (z_const char *)"stream end", /* Z_STREAM_END 1 */ 17 (z_const char *)"", /* Z_OK 0 */ 18 (z_const char *)"file error", /* Z_ERRNO (-1) */ 19 (z_const char *)"stream error", /* Z_STREAM_ERROR (-2) */ 20 (z_const char *)"data error", /* Z_DATA_ERROR (-3) */ 21 (z_const char *)"insufficient memory", /* Z_MEM_ERROR (-4) */ 22 (z_const char *)"buffer error", /* Z_BUF_ERROR (-5) */ 23 (z_const char *)"incompatible version",/* Z_VERSION_ERROR (-6) */ 24 (z_const char *)"" 25 }; 26 27 28 const char * ZEXPORT zlibVersion() 29 { 30 return ZLIB_VERSION; 31 } 32 33 uLong ZEXPORT zlibCompileFlags() 34 { 35 uLong flags; 36 37 flags = 0; 38 switch ((int)(sizeof(uInt))) { 39 case 2: break; 40 case 4: flags += 1; break; 41 case 8: flags += 2; break; 42 default: flags += 3; 43 } 44 switch ((int)(sizeof(uLong))) { 45 case 2: break; 46 case 4: flags += 1 << 2; break; 47 case 8: flags += 2 << 2; break; 48 default: flags += 3 << 2; 49 } 50 switch ((int)(sizeof(voidpf))) { 51 case 2: break; 52 case 4: flags += 1 << 4; break; 53 case 8: flags += 2 << 4; break; 54 default: flags += 3 << 4; 55 } 56 switch ((int)(sizeof(z_off_t))) { 57 case 2: break; 58 case 4: flags += 1 << 6; break; 59 case 8: flags += 2 << 6; break; 60 default: flags += 3 << 6; 61 } 62 #ifdef ZLIB_DEBUG 63 flags += 1 << 8; 64 #endif 65 #if defined(ASMV) || defined(ASMINF) 66 flags += 1 << 9; 67 #endif 68 #ifdef ZLIB_WINAPI 69 flags += 1 << 10; 70 #endif 71 #ifdef BUILDFIXED 72 flags += 1 << 12; 73 #endif 74 #ifdef DYNAMIC_CRC_TABLE 75 flags += 1 << 13; 76 #endif 77 #ifdef NO_GZCOMPRESS 78 flags += 1L << 16; 79 #endif 80 #ifdef NO_GZIP 81 flags += 1L << 17; 82 #endif 83 #ifdef PKZIP_BUG_WORKAROUND 84 flags += 1L << 20; 85 #endif 86 #ifdef FASTEST 87 flags += 1L << 21; 88 #endif 89 #if defined(STDC) || defined(Z_HAVE_STDARG_H) 90 # ifdef NO_vsnprintf 91 flags += 1L << 25; 92 # ifdef HAS_vsprintf_void 93 flags += 1L << 26; 94 # endif 95 # else 96 # ifdef HAS_vsnprintf_void 97 flags += 1L << 26; 98 # endif 99 # endif 100 #else 101 flags += 1L << 24; 102 # ifdef NO_snprintf 103 flags += 1L << 25; 104 # ifdef HAS_sprintf_void 105 flags += 1L << 26; 106 # endif 107 # else 108 # ifdef HAS_snprintf_void 109 flags += 1L << 26; 110 # endif 111 # endif 112 #endif 113 return flags; 114 } 115 116 #ifdef ZLIB_DEBUG 117 #include <stdlib.h> 118 # ifndef verbose 119 # define verbose 0 120 # endif 121 int ZLIB_INTERNAL z_verbose = verbose; 122 123 void ZLIB_INTERNAL z_error (m) 124 char *m; 125 { 126 fprintf(stderr, "%s\n", m); 127 exit(1); 128 } 129 #endif 130 131 /* exported to allow conversion of error code to string for compress() and 132 * uncompress() 133 */ 134 const char * ZEXPORT zError(err) 135 int err; 136 { 137 return ERR_MSG(err); 138 } 139 140 #if defined(_WIN32_WCE) && _WIN32_WCE < 0x800 141 /* The older Microsoft C Run-Time Library for Windows CE doesn't have 142 * errno. We define it as a global variable to simplify porting. 143 * Its value is always 0 and should not be used. 144 */ 145 int errno = 0; 146 #endif 147 148 #ifndef HAVE_MEMCPY 149 150 void ZLIB_INTERNAL zmemcpy(dest, source, len) 151 Bytef* dest; 152 const Bytef* source; 153 uInt len; 154 { 155 if (len == 0) return; 156 do { 157 *dest++ = *source++; /* ??? to be unrolled */ 158 } while (--len != 0); 159 } 160 161 int ZLIB_INTERNAL zmemcmp(s1, s2, len) 162 const Bytef* s1; 163 const Bytef* s2; 164 uInt len; 165 { 166 uInt j; 167 168 for (j = 0; j < len; j++) { 169 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; 170 } 171 return 0; 172 } 173 174 void ZLIB_INTERNAL zmemzero(dest, len) 175 Bytef* dest; 176 uInt len; 177 { 178 if (len == 0) return; 179 do { 180 *dest++ = 0; /* ??? to be unrolled */ 181 } while (--len != 0); 182 } 183 #endif 184 185 #ifndef Z_SOLO 186 187 #ifdef SYS16BIT 188 189 #ifdef __TURBOC__ 190 /* Turbo C in 16-bit mode */ 191 192 # define MY_ZCALLOC 193 194 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes 195 * and farmalloc(64K) returns a pointer with an offset of 8, so we 196 * must fix the pointer. Warning: the pointer must be put back to its 197 * original form in order to free it, use zcfree(). 198 */ 199 200 #define MAX_PTR 10 201 /* 10*64K = 640K */ 202 203 local int next_ptr = 0; 204 205 typedef struct ptr_table_s { 206 voidpf org_ptr; 207 voidpf new_ptr; 208 } ptr_table; 209 210 local ptr_table table[MAX_PTR]; 211 /* This table is used to remember the original form of pointers 212 * to large buffers (64K). Such pointers are normalized with a zero offset. 213 * Since MSDOS is not a preemptive multitasking OS, this table is not 214 * protected from concurrent access. This hack doesn't work anyway on 215 * a protected system like OS/2. Use Microsoft C instead. 216 */ 217 218 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size) 219 { 220 voidpf buf; 221 ulg bsize = (ulg)items*size; 222 223 (void)opaque; 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; 247 248 (void)opaque; 249 250 if (*(ush*)&ptr != 0) { /* object < 64K */ 251 farfree(ptr); 252 return; 253 } 254 /* Find the original pointer */ 255 for (n = 0; n < next_ptr; n++) { 256 if (ptr != table[n].new_ptr) continue; 257 258 farfree(table[n].org_ptr); 259 while (++n < next_ptr) { 260 table[n-1] = table[n]; 261 } 262 next_ptr--; 263 return; 264 } 265 Assert(0, "zcfree: ptr not found"); 266 } 267 268 #endif /* __TURBOC__ */ 269 270 271 #ifdef M_I86 272 /* Microsoft C in 16-bit mode */ 273 274 # define MY_ZCALLOC 275 276 #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) 277 # define _halloc halloc 278 # define _hfree hfree 279 #endif 280 281 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size) 282 { 283 (void)opaque; 284 return _halloc((long)items, size); 285 } 286 287 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr) 288 { 289 (void)opaque; 290 _hfree(ptr); 291 } 292 293 #endif /* M_I86 */ 294 295 #endif /* SYS16BIT */ 296 297 298 #ifndef MY_ZCALLOC /* Any system without a special alloc function */ 299 300 #ifndef STDC 301 extern voidp malloc OF((uInt size)); 302 extern voidp calloc OF((uInt items, uInt size)); 303 extern void free OF((voidpf ptr)); 304 #endif 305 306 voidpf ZLIB_INTERNAL zcalloc (opaque, items, size) 307 voidpf opaque; 308 unsigned items; 309 unsigned size; 310 { 311 (void)opaque; 312 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : 313 (voidpf)calloc(items, size); 314 } 315 316 void ZLIB_INTERNAL zcfree (opaque, ptr) 317 voidpf opaque; 318 voidpf ptr; 319 { 320 (void)opaque; 321 free(ptr); 322 } 323 324 #endif /* MY_ZCALLOC */ 325 326 #endif /* !Z_SOLO */ 327