1 /* $NetBSD: zutil.c,v 1.4 2022/10/15 19:49:32 christos Exp $ */ 2 3 /* zutil.c -- target dependent utility functions for the compression library 4 * Copyright (C) 1995-2017 Jean-loup Gailly 5 * For conditions of distribution and use, see copyright notice in zlib.h 6 */ 7 8 /* @(#) Id */ 9 10 #include "zutil.h" 11 #ifndef Z_SOLO 12 # include "gzguts.h" 13 #endif 14 15 z_const char * const z_errmsg[10] = { 16 __UNCONST("need dictionary"), /* Z_NEED_DICT 2 */ 17 __UNCONST("stream end"), /* Z_STREAM_END 1 */ 18 __UNCONST(""), /* Z_OK 0 */ 19 __UNCONST("file error"), /* Z_ERRNO (-1) */ 20 __UNCONST("stream error"), /* Z_STREAM_ERROR (-2) */ 21 __UNCONST("data error"), /* Z_DATA_ERROR (-3) */ 22 __UNCONST("insufficient memory"), /* Z_MEM_ERROR (-4) */ 23 __UNCONST("buffer error"), /* Z_BUF_ERROR (-5) */ 24 __UNCONST("incompatible version"),/* Z_VERSION_ERROR (-6) */ 25 __UNCONST(""), 26 }; 27 28 29 const char * ZEXPORT zlibVersion() 30 { 31 return ZLIB_VERSION; 32 } 33 34 uLong ZEXPORT zlibCompileFlags() 35 { 36 uLong flags; 37 38 flags = 0; 39 switch ((int)(sizeof(uInt))) { 40 case 2: break; 41 case 4: flags += 1; break; 42 case 8: flags += 2; break; 43 default: flags += 3; 44 } 45 switch ((int)(sizeof(uLong))) { 46 case 2: break; 47 case 4: flags += 1 << 2; break; 48 case 8: flags += 2 << 2; break; 49 default: flags += 3 << 2; 50 } 51 switch ((int)(sizeof(voidpf))) { 52 case 2: break; 53 case 4: flags += 1 << 4; break; 54 case 8: flags += 2 << 4; break; 55 default: flags += 3 << 4; 56 } 57 switch ((int)(sizeof(z_off_t))) { 58 case 2: break; 59 case 4: flags += 1 << 6; break; 60 case 8: flags += 2 << 6; break; 61 default: flags += 3 << 6; 62 } 63 #ifdef ZLIB_DEBUG 64 flags += 1 << 8; 65 #endif 66 /* 67 #if defined(ASMV) || defined(ASMINF) 68 flags += 1 << 9; 69 #endif 70 */ 71 #ifdef ZLIB_WINAPI 72 flags += 1 << 10; 73 #endif 74 #ifdef BUILDFIXED 75 flags += 1 << 12; 76 #endif 77 #ifdef DYNAMIC_CRC_TABLE 78 flags += 1 << 13; 79 #endif 80 #ifdef NO_GZCOMPRESS 81 flags += 1L << 16; 82 #endif 83 #ifdef NO_GZIP 84 flags += 1L << 17; 85 #endif 86 #ifdef PKZIP_BUG_WORKAROUND 87 flags += 1L << 20; 88 #endif 89 #ifdef FASTEST 90 flags += 1L << 21; 91 #endif 92 #if defined(STDC) || defined(Z_HAVE_STDARG_H) 93 # ifdef NO_vsnprintf 94 flags += 1L << 25; 95 # ifdef HAS_vsprintf_void 96 flags += 1L << 26; 97 # endif 98 # else 99 # ifdef HAS_vsnprintf_void 100 flags += 1L << 26; 101 # endif 102 # endif 103 #else 104 flags += 1L << 24; 105 # ifdef NO_snprintf 106 flags += 1L << 25; 107 # ifdef HAS_sprintf_void 108 flags += 1L << 26; 109 # endif 110 # else 111 # ifdef HAS_snprintf_void 112 flags += 1L << 26; 113 # endif 114 # endif 115 #endif 116 return flags; 117 } 118 119 #ifdef ZLIB_DEBUG 120 #include <stdlib.h> 121 # ifndef verbose 122 # define verbose 0 123 # endif 124 int ZLIB_INTERNAL z_verbose = verbose; 125 126 void ZLIB_INTERNAL z_error(m) 127 char *m; 128 { 129 fprintf(stderr, "%s\n", m); 130 exit(1); 131 } 132 #endif 133 134 /* exported to allow conversion of error code to string for compress() and 135 * uncompress() 136 */ 137 const char * ZEXPORT zError(err) 138 int err; 139 { 140 return ERR_MSG(err); 141 } 142 143 #if defined(_WIN32_WCE) && _WIN32_WCE < 0x800 144 /* The older Microsoft C Run-Time Library for Windows CE doesn't have 145 * errno. We define it as a global variable to simplify porting. 146 * Its value is always 0 and should not be used. 147 */ 148 int errno = 0; 149 #endif 150 151 #ifndef HAVE_MEMCPY 152 153 void ZLIB_INTERNAL zmemcpy(dest, source, len) 154 Bytef* dest; 155 const Bytef* source; 156 uInt len; 157 { 158 if (len == 0) return; 159 do { 160 *dest++ = *source++; /* ??? to be unrolled */ 161 } while (--len != 0); 162 } 163 164 int ZLIB_INTERNAL zmemcmp(s1, s2, len) 165 const Bytef* s1; 166 const Bytef* s2; 167 uInt len; 168 { 169 uInt j; 170 171 for (j = 0; j < len; j++) { 172 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; 173 } 174 return 0; 175 } 176 177 void ZLIB_INTERNAL zmemzero(dest, len) 178 Bytef* dest; 179 uInt len; 180 { 181 if (len == 0) return; 182 do { 183 *dest++ = 0; /* ??? to be unrolled */ 184 } while (--len != 0); 185 } 186 #endif 187 188 #ifndef Z_SOLO 189 190 #ifdef SYS16BIT 191 192 #ifdef __TURBOC__ 193 /* Turbo C in 16-bit mode */ 194 195 # define MY_ZCALLOC 196 197 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes 198 * and farmalloc(64K) returns a pointer with an offset of 8, so we 199 * must fix the pointer. Warning: the pointer must be put back to its 200 * original form in order to free it, use zcfree(). 201 */ 202 203 #define MAX_PTR 10 204 /* 10*64K = 640K */ 205 206 local int next_ptr = 0; 207 208 typedef struct ptr_table_s { 209 voidpf org_ptr; 210 voidpf new_ptr; 211 } ptr_table; 212 213 local ptr_table table[MAX_PTR]; 214 /* This table is used to remember the original form of pointers 215 * to large buffers (64K). Such pointers are normalized with a zero offset. 216 * Since MSDOS is not a preemptive multitasking OS, this table is not 217 * protected from concurrent access. This hack doesn't work anyway on 218 * a protected system like OS/2. Use Microsoft C instead. 219 */ 220 221 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) 222 { 223 voidpf buf; 224 ulg bsize = (ulg)items*size; 225 226 (void)opaque; 227 228 /* If we allocate less than 65520 bytes, we assume that farmalloc 229 * will return a usable pointer which doesn't have to be normalized. 230 */ 231 if (bsize < 65520L) { 232 buf = farmalloc(bsize); 233 if (*(ush*)&buf != 0) return buf; 234 } else { 235 buf = farmalloc(bsize + 16L); 236 } 237 if (buf == NULL || next_ptr >= MAX_PTR) return NULL; 238 table[next_ptr].org_ptr = buf; 239 240 /* Normalize the pointer to seg:0 */ 241 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; 242 *(ush*)&buf = 0; 243 table[next_ptr++].new_ptr = buf; 244 return buf; 245 } 246 247 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) 248 { 249 int n; 250 251 (void)opaque; 252 253 if (*(ush*)&ptr != 0) { /* object < 64K */ 254 farfree(ptr); 255 return; 256 } 257 /* Find the original pointer */ 258 for (n = 0; n < next_ptr; n++) { 259 if (ptr != table[n].new_ptr) continue; 260 261 farfree(table[n].org_ptr); 262 while (++n < next_ptr) { 263 table[n-1] = table[n]; 264 } 265 next_ptr--; 266 return; 267 } 268 Assert(0, "zcfree: ptr not found"); 269 } 270 271 #endif /* __TURBOC__ */ 272 273 274 #ifdef M_I86 275 /* Microsoft C in 16-bit mode */ 276 277 # define MY_ZCALLOC 278 279 #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) 280 # define _halloc halloc 281 # define _hfree hfree 282 #endif 283 284 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, uInt items, uInt size) 285 { 286 (void)opaque; 287 return _halloc((long)items, size); 288 } 289 290 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) 291 { 292 (void)opaque; 293 _hfree(ptr); 294 } 295 296 #endif /* M_I86 */ 297 298 #endif /* SYS16BIT */ 299 300 301 #ifndef MY_ZCALLOC /* Any system without a special alloc function */ 302 303 #ifndef STDC 304 extern voidp malloc OF((uInt size)); 305 extern voidp calloc OF((uInt items, uInt size)); 306 extern void free OF((voidpf ptr)); 307 #endif 308 309 voidpf ZLIB_INTERNAL zcalloc(opaque, items, size) 310 voidpf opaque; 311 unsigned items; 312 unsigned size; 313 { 314 (void)opaque; 315 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : 316 (voidpf)calloc(items, size); 317 } 318 319 void ZLIB_INTERNAL zcfree(opaque, ptr) 320 voidpf opaque; 321 voidpf ptr; 322 { 323 (void)opaque; 324 free(ptr); 325 } 326 327 #endif /* MY_ZCALLOC */ 328 329 #endif /* !Z_SOLO */ 330