1 /* $OpenBSD: zutil.c,v 1.3 2021/07/04 14:24:49 tb Exp $ */ 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 #include "zutil.h" 8 9 #ifndef _KERNEL 10 #ifndef Z_SOLO 11 # include "gzguts.h" 12 #endif 13 #endif 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() 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 #if defined(ASMV) || defined(ASMINF) 67 flags += 1 << 9; 68 #endif 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 (m) 125 char *m; 126 { 127 fprintf(stderr, "%s\n", m); 128 exit(1); 129 } 130 #endif 131 132 /* exported to allow conversion of error code to string for compress() and 133 * uncompress() 134 */ 135 const char * ZEXPORT zError(err) 136 int err; 137 { 138 return ERR_MSG(err); 139 } 140 141 #if defined(_WIN32_WCE) 142 /* The Microsoft C Run-Time Library for Windows CE doesn't have 143 * errno. We define it as a global variable to simplify porting. 144 * Its value is always 0 and should not be used. 145 */ 146 int errno = 0; 147 #endif 148 149 #ifndef HAVE_MEMCPY 150 151 void ZLIB_INTERNAL zmemcpy(dest, source, len) 152 Bytef* dest; 153 const Bytef* source; 154 uInt len; 155 { 156 if (len == 0) return; 157 do { 158 *dest++ = *source++; /* ??? to be unrolled */ 159 } while (--len != 0); 160 } 161 162 int ZLIB_INTERNAL zmemcmp(s1, s2, len) 163 const Bytef* s1; 164 const Bytef* s2; 165 uInt len; 166 { 167 uInt j; 168 169 for (j = 0; j < len; j++) { 170 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; 171 } 172 return 0; 173 } 174 175 void ZLIB_INTERNAL zmemzero(dest, len) 176 Bytef* dest; 177 uInt len; 178 { 179 if (len == 0) return; 180 do { 181 *dest++ = 0; /* ??? to be unrolled */ 182 } while (--len != 0); 183 } 184 #endif 185 186 #ifndef Z_SOLO 187 188 #ifdef SYS16BIT 189 190 #ifdef __TURBOC__ 191 /* Turbo C in 16-bit mode */ 192 193 # define MY_ZCALLOC 194 195 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes 196 * and farmalloc(64K) returns a pointer with an offset of 8, so we 197 * must fix the pointer. Warning: the pointer must be put back to its 198 * original form in order to free it, use zcfree(). 199 */ 200 201 #define MAX_PTR 10 202 /* 10*64K = 640K */ 203 204 local int next_ptr = 0; 205 206 typedef struct ptr_table_s { 207 voidpf org_ptr; 208 voidpf new_ptr; 209 } ptr_table; 210 211 local ptr_table table[MAX_PTR]; 212 /* This table is used to remember the original form of pointers 213 * to large buffers (64K). Such pointers are normalized with a zero offset. 214 * Since MSDOS is not a preemptive multitasking OS, this table is not 215 * protected from concurrent access. This hack doesn't work anyway on 216 * a protected system like OS/2. Use Microsoft C instead. 217 */ 218 219 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size) 220 { 221 voidpf buf; 222 ulg bsize = (ulg)items*size; 223 224 (void)opaque; 225 226 /* If we allocate less than 65520 bytes, we assume that farmalloc 227 * will return a usable pointer which doesn't have to be normalized. 228 */ 229 if (bsize < 65520L) { 230 buf = farmalloc(bsize); 231 if (*(ush*)&buf != 0) return buf; 232 } else { 233 buf = farmalloc(bsize + 16L); 234 } 235 if (buf == NULL || next_ptr >= MAX_PTR) return NULL; 236 table[next_ptr].org_ptr = buf; 237 238 /* Normalize the pointer to seg:0 */ 239 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; 240 *(ush*)&buf = 0; 241 table[next_ptr++].new_ptr = buf; 242 return buf; 243 } 244 245 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr) 246 { 247 int n; 248 249 (void)opaque; 250 251 if (*(ush*)&ptr != 0) { /* object < 64K */ 252 farfree(ptr); 253 return; 254 } 255 /* Find the original pointer */ 256 for (n = 0; n < next_ptr; n++) { 257 if (ptr != table[n].new_ptr) continue; 258 259 farfree(table[n].org_ptr); 260 while (++n < next_ptr) { 261 table[n-1] = table[n]; 262 } 263 next_ptr--; 264 return; 265 } 266 Assert(0, "zcfree: ptr not found"); 267 } 268 269 #endif /* __TURBOC__ */ 270 271 272 #ifdef M_I86 273 /* Microsoft C in 16-bit mode */ 274 275 # define MY_ZCALLOC 276 277 #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) 278 # define _halloc halloc 279 # define _hfree hfree 280 #endif 281 282 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size) 283 { 284 (void)opaque; 285 return _halloc((long)items, size); 286 } 287 288 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr) 289 { 290 (void)opaque; 291 _hfree(ptr); 292 } 293 294 #endif /* M_I86 */ 295 296 #endif /* SYS16BIT */ 297 298 299 #ifndef MY_ZCALLOC /* Any system without a special alloc function */ 300 301 #ifndef STDC 302 extern voidp malloc OF((uInt size)); 303 extern voidp calloc OF((uInt items, uInt size)); 304 extern void free OF((voidpf ptr)); 305 #endif 306 307 voidpf ZLIB_INTERNAL zcalloc (opaque, items, size) 308 voidpf opaque; 309 unsigned items; 310 unsigned size; 311 { 312 (void)opaque; 313 if (items == 0 || size == 0) 314 return (NULL); 315 return reallocarray(NULL, items, size); 316 } 317 318 void ZLIB_INTERNAL zcfree (opaque, ptr) 319 voidpf opaque; 320 voidpf ptr; 321 { 322 (void)opaque; 323 free(ptr); 324 } 325 326 #endif /* MY_ZCALLOC */ 327 328 #endif /* !Z_SOLO */ 329