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 8#ifndef _KERNEL 9#ifndef Z_SOLO 10# include "gzguts.h" 11#endif 12#endif 13 14z_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 28const char * ZEXPORT zlibVersion(void) { 29 return ZLIB_VERSION; 30} 31 32uLong ZEXPORT zlibCompileFlags(void) { 33 uLong flags; 34 35 flags = 0; 36 switch ((int)(sizeof(uInt))) { 37 case 2: break; 38 case 4: flags += 1; break; 39 case 8: flags += 2; break; 40 default: flags += 3; 41 } 42 switch ((int)(sizeof(uLong))) { 43 case 2: break; 44 case 4: flags += 1 << 2; break; 45 case 8: flags += 2 << 2; break; 46 default: flags += 3 << 2; 47 } 48 switch ((int)(sizeof(voidpf))) { 49 case 2: break; 50 case 4: flags += 1 << 4; break; 51 case 8: flags += 2 << 4; break; 52 default: flags += 3 << 4; 53 } 54 switch ((int)(sizeof(z_off_t))) { 55 case 2: break; 56 case 4: flags += 1 << 6; break; 57 case 8: flags += 2 << 6; break; 58 default: flags += 3 << 6; 59 } 60#ifdef ZLIB_DEBUG 61 flags += 1 << 8; 62#endif 63 /* 64#if defined(ASMV) || defined(ASMINF) 65 flags += 1 << 9; 66#endif 67 */ 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 121int ZLIB_INTERNAL z_verbose = verbose; 122 123void ZLIB_INTERNAL z_error(char *m) { 124 fprintf(stderr, "%s\n", m); 125 exit(1); 126} 127#endif 128 129/* exported to allow conversion of error code to string for compress() and 130 * uncompress() 131 */ 132const char * ZEXPORT zError(int err) { 133 return ERR_MSG(err); 134} 135 136#if defined(_WIN32_WCE) && _WIN32_WCE < 0x800 137 /* The older Microsoft C Run-Time Library for Windows CE doesn't have 138 * errno. We define it as a global variable to simplify porting. 139 * Its value is always 0 and should not be used. 140 */ 141 int errno = 0; 142#endif 143 144#ifndef HAVE_MEMCPY 145 146void ZLIB_INTERNAL zmemcpy(Bytef* dest, const Bytef* source, uInt len) { 147 if (len == 0) return; 148 do { 149 *dest++ = *source++; /* ??? to be unrolled */ 150 } while (--len != 0); 151} 152 153int ZLIB_INTERNAL zmemcmp(const Bytef* s1, const Bytef* s2, uInt len) { 154 uInt j; 155 156 for (j = 0; j < len; j++) { 157 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; 158 } 159 return 0; 160} 161 162void ZLIB_INTERNAL zmemzero(Bytef* dest, uInt len) { 163 if (len == 0) return; 164 do { 165 *dest++ = 0; /* ??? to be unrolled */ 166 } while (--len != 0); 167} 168#endif 169 170#ifndef Z_SOLO 171 172#ifdef SYS16BIT 173 174#ifdef __TURBOC__ 175/* Turbo C in 16-bit mode */ 176 177# define MY_ZCALLOC 178 179/* Turbo C malloc() does not allow dynamic allocation of 64K bytes 180 * and farmalloc(64K) returns a pointer with an offset of 8, so we 181 * must fix the pointer. Warning: the pointer must be put back to its 182 * original form in order to free it, use zcfree(). 183 */ 184 185#define MAX_PTR 10 186/* 10*64K = 640K */ 187 188local int next_ptr = 0; 189 190typedef struct ptr_table_s { 191 voidpf org_ptr; 192 voidpf new_ptr; 193} ptr_table; 194 195local ptr_table table[MAX_PTR]; 196/* This table is used to remember the original form of pointers 197 * to large buffers (64K). Such pointers are normalized with a zero offset. 198 * Since MSDOS is not a preemptive multitasking OS, this table is not 199 * protected from concurrent access. This hack doesn't work anyway on 200 * a protected system like OS/2. Use Microsoft C instead. 201 */ 202 203voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) { 204 voidpf buf; 205 ulg bsize = (ulg)items*size; 206 207 (void)opaque; 208 209 /* If we allocate less than 65520 bytes, we assume that farmalloc 210 * will return a usable pointer which doesn't have to be normalized. 211 */ 212 if (bsize < 65520L) { 213 buf = farmalloc(bsize); 214 if (*(ush*)&buf != 0) return buf; 215 } else { 216 buf = farmalloc(bsize + 16L); 217 } 218 if (buf == NULL || next_ptr >= MAX_PTR) return NULL; 219 table[next_ptr].org_ptr = buf; 220 221 /* Normalize the pointer to seg:0 */ 222 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; 223 *(ush*)&buf = 0; 224 table[next_ptr++].new_ptr = buf; 225 return buf; 226} 227 228void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) { 229 int n; 230 231 (void)opaque; 232 233 if (*(ush*)&ptr != 0) { /* object < 64K */ 234 farfree(ptr); 235 return; 236 } 237 /* Find the original pointer */ 238 for (n = 0; n < next_ptr; n++) { 239 if (ptr != table[n].new_ptr) continue; 240 241 farfree(table[n].org_ptr); 242 while (++n < next_ptr) { 243 table[n-1] = table[n]; 244 } 245 next_ptr--; 246 return; 247 } 248 Assert(0, "zcfree: ptr not found"); 249} 250 251#endif /* __TURBOC__ */ 252 253 254#ifdef M_I86 255/* Microsoft C in 16-bit mode */ 256 257# define MY_ZCALLOC 258 259#if (!defined(_MSC_VER) || (_MSC_VER <= 600)) 260# define _halloc halloc 261# define _hfree hfree 262#endif 263 264voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, uInt items, uInt size) { 265 (void)opaque; 266 return _halloc((long)items, size); 267} 268 269void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) { 270 (void)opaque; 271 _hfree(ptr); 272} 273 274#endif /* M_I86 */ 275 276#endif /* SYS16BIT */ 277 278 279#ifndef MY_ZCALLOC /* Any system without a special alloc function */ 280 281#ifndef STDC 282extern voidp malloc(uInt size); 283extern voidp calloc(uInt items, uInt size); 284extern void free(voidpf ptr); 285#endif 286 287voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) { 288 (void)opaque; 289 if (items == 0 || size == 0) 290 return (NULL); 291 return reallocarray(NULL, items, size); 292} 293 294void 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