1 /* $NetBSD: zutil.c,v 1.5 2024/09/22 19:12:28 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(void) { 30 return ZLIB_VERSION; 31 } 32 33 uLong ZEXPORT zlibCompileFlags(void) { 34 uLong flags; 35 36 flags = 0; 37 switch ((int)(sizeof(uInt))) { 38 case 2: break; 39 case 4: flags += 1; break; 40 case 8: flags += 2; break; 41 default: flags += 3; 42 } 43 switch ((int)(sizeof(uLong))) { 44 case 2: break; 45 case 4: flags += 1 << 2; break; 46 case 8: flags += 2 << 2; break; 47 default: flags += 3 << 2; 48 } 49 switch ((int)(sizeof(voidpf))) { 50 case 2: break; 51 case 4: flags += 1 << 4; break; 52 case 8: flags += 2 << 4; break; 53 default: flags += 3 << 4; 54 } 55 switch ((int)(sizeof(z_off_t))) { 56 case 2: break; 57 case 4: flags += 1 << 6; break; 58 case 8: flags += 2 << 6; break; 59 default: flags += 3 << 6; 60 } 61 #ifdef ZLIB_DEBUG 62 flags += 1 << 8; 63 #endif 64 /* 65 #if defined(ASMV) || defined(ASMINF) 66 flags += 1 << 9; 67 #endif 68 */ 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(char *m) { 125 fprintf(stderr, "%s\n", m); 126 exit(1); 127 } 128 #endif 129 130 /* exported to allow conversion of error code to string for compress() and 131 * uncompress() 132 */ 133 const char * ZEXPORT zError(int err) { 134 return ERR_MSG(err); 135 } 136 137 #if defined(_WIN32_WCE) && _WIN32_WCE < 0x800 138 /* The older Microsoft C Run-Time Library for Windows CE doesn't have 139 * errno. We define it as a global variable to simplify porting. 140 * Its value is always 0 and should not be used. 141 */ 142 int errno = 0; 143 #endif 144 145 #ifndef HAVE_MEMCPY 146 147 void ZLIB_INTERNAL zmemcpy(Bytef* dest, const Bytef* source, uInt len) { 148 if (len == 0) return; 149 do { 150 *dest++ = *source++; /* ??? to be unrolled */ 151 } while (--len != 0); 152 } 153 154 int ZLIB_INTERNAL zmemcmp(const Bytef* s1, const Bytef* s2, uInt len) { 155 uInt j; 156 157 for (j = 0; j < len; j++) { 158 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; 159 } 160 return 0; 161 } 162 163 void ZLIB_INTERNAL zmemzero(Bytef* dest, uInt len) { 164 if (len == 0) return; 165 do { 166 *dest++ = 0; /* ??? to be unrolled */ 167 } while (--len != 0); 168 } 169 #endif 170 171 #ifndef Z_SOLO 172 173 #ifdef SYS16BIT 174 175 #ifdef __TURBOC__ 176 /* Turbo C in 16-bit mode */ 177 178 # define MY_ZCALLOC 179 180 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes 181 * and farmalloc(64K) returns a pointer with an offset of 8, so we 182 * must fix the pointer. Warning: the pointer must be put back to its 183 * original form in order to free it, use zcfree(). 184 */ 185 186 #define MAX_PTR 10 187 /* 10*64K = 640K */ 188 189 local int next_ptr = 0; 190 191 typedef struct ptr_table_s { 192 voidpf org_ptr; 193 voidpf new_ptr; 194 } ptr_table; 195 196 local ptr_table table[MAX_PTR]; 197 /* This table is used to remember the original form of pointers 198 * to large buffers (64K). Such pointers are normalized with a zero offset. 199 * Since MSDOS is not a preemptive multitasking OS, this table is not 200 * protected from concurrent access. This hack doesn't work anyway on 201 * a protected system like OS/2. Use Microsoft C instead. 202 */ 203 204 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) { 205 voidpf buf; 206 ulg bsize = (ulg)items*size; 207 208 (void)opaque; 209 210 /* If we allocate less than 65520 bytes, we assume that farmalloc 211 * will return a usable pointer which doesn't have to be normalized. 212 */ 213 if (bsize < 65520L) { 214 buf = farmalloc(bsize); 215 if (*(ush*)&buf != 0) return buf; 216 } else { 217 buf = farmalloc(bsize + 16L); 218 } 219 if (buf == NULL || next_ptr >= MAX_PTR) return NULL; 220 table[next_ptr].org_ptr = buf; 221 222 /* Normalize the pointer to seg:0 */ 223 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; 224 *(ush*)&buf = 0; 225 table[next_ptr++].new_ptr = buf; 226 return buf; 227 } 228 229 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) { 230 int n; 231 232 (void)opaque; 233 234 if (*(ush*)&ptr != 0) { /* object < 64K */ 235 farfree(ptr); 236 return; 237 } 238 /* Find the original pointer */ 239 for (n = 0; n < next_ptr; n++) { 240 if (ptr != table[n].new_ptr) continue; 241 242 farfree(table[n].org_ptr); 243 while (++n < next_ptr) { 244 table[n-1] = table[n]; 245 } 246 next_ptr--; 247 return; 248 } 249 Assert(0, "zcfree: ptr not found"); 250 } 251 252 #endif /* __TURBOC__ */ 253 254 255 #ifdef M_I86 256 /* Microsoft C in 16-bit mode */ 257 258 # define MY_ZCALLOC 259 260 #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) 261 # define _halloc halloc 262 # define _hfree hfree 263 #endif 264 265 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, uInt items, uInt size) { 266 (void)opaque; 267 return _halloc((long)items, size); 268 } 269 270 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) { 271 (void)opaque; 272 _hfree(ptr); 273 } 274 275 #endif /* M_I86 */ 276 277 #endif /* SYS16BIT */ 278 279 280 #ifndef MY_ZCALLOC /* Any system without a special alloc function */ 281 282 #ifndef STDC 283 extern voidp malloc(uInt size); 284 extern voidp calloc(uInt items, uInt size); 285 extern void free(voidpf ptr); 286 #endif 287 288 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) { 289 (void)opaque; 290 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : 291 (voidpf)calloc(items, size); 292 } 293 294 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) { 295 (void)opaque; 296 free(ptr); 297 } 298 299 #endif /* MY_ZCALLOC */ 300 301 #endif /* !Z_SOLO */ 302