common/dist/zlib/zutil.c

   1 /*      $NetBSD: zutil.c,v 1.2 2006/01/16 17:02:29 christos Exp $       */
   2
   3 /* zutil.c -- target dependent utility functions for the compression library
   4  * Copyright (C) 1995-2005 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
  12 #ifndef NO_DUMMY_DECL
  13 struct internal_state      {int dummy;}; /* for buggy compilers */
  14 #endif
  15
  16 const char * const z_errmsg[10] = {
  17 "need dictionary",     /* Z_NEED_DICT       2  */
  18 "stream end",          /* Z_STREAM_END      1  */
  19 "",                    /* Z_OK              0  */
  20 "file error",          /* Z_ERRNO         (-1) */
  21 "stream error",        /* Z_STREAM_ERROR  (-2) */
  22 "data error",          /* Z_DATA_ERROR    (-3) */
  23 "insufficient memory", /* Z_MEM_ERROR     (-4) */
  24 "buffer error",        /* Z_BUF_ERROR     (-5) */
  25 "incompatible version",/* Z_VERSION_ERROR (-6) */
  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 (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 (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 (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 (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 #ifdef STDC
  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
 119 #  ifndef verbose
 120 #    define verbose 0
 121 #  endif
 122 int z_verbose = verbose;
 123
 124 void 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 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 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 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
 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 zcalloc (voidpf opaque, unsigned items, unsigned size)
 219 {
 220     voidpf buf = opaque; /* just to make some compilers happy */
 221     ulg bsize = (ulg)items*size;
 222
 223     /* If we allocate less than 65520 bytes, we assume that farmalloc
 224      * will return a usable pointer which doesn't have to be normalized.
 225      */
 226     if (bsize < 65520L) {
 227         buf = farmalloc(bsize);
 228         if (*(ush*)&buf != 0) return buf;
 229     } else {
 230         buf = farmalloc(bsize + 16L);
 231     }
 232     if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
 233     table[next_ptr].org_ptr = buf;
 234
 235     /* Normalize the pointer to seg:0 */
 236     *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
 237     *(ush*)&buf = 0;
 238     table[next_ptr++].new_ptr = buf;
 239     return buf;
 240 }
 241
 242 void  zcfree (voidpf opaque, voidpf ptr)
 243 {
 244     int n;
 245     if (*(ush*)&ptr != 0) { /* object < 64K */
 246         farfree(ptr);
 247         return;
 248     }
 249     /* Find the original pointer */
 250     for (n = 0; n < next_ptr; n++) {
 251         if (ptr != table[n].new_ptr) continue;
 252
 253         farfree(table[n].org_ptr);
 254         while (++n < next_ptr) {
 255             table[n-1] = table[n];
 256         }
 257         next_ptr--;
 258         return;
 259     }
 260     ptr = opaque; /* just to make some compilers happy */
 261     Assert(0, "zcfree: ptr not found");
 262 }
 263
 264 #endif /* __TURBOC__ */
 265
 266
 267 #ifdef M_I86
 268 /* Microsoft C in 16-bit mode */
 269
 270 #  define MY_ZCALLOC
 271
 272 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
 273 #  define _halloc  halloc
 274 #  define _hfree   hfree
 275 #endif
 276
 277 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
 278 {
 279     if (opaque) opaque = 0; /* to make compiler happy */
 280     return _halloc((long)items, size);
 281 }
 282
 283 void  zcfree (voidpf opaque, voidpf ptr)
 284 {
 285     if (opaque) opaque = 0; /* to make compiler happy */
 286     _hfree(ptr);
 287 }
 288
 289 #endif /* M_I86 */
 290
 291 #endif /* SYS16BIT */
 292
 293
 294 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
 295
 296 #ifndef STDC
 297 extern voidp  malloc OF((uInt size));
 298 extern voidp  calloc OF((uInt items, uInt size));
 299 extern void   free   OF((voidpf ptr));
 300 #endif
 301
 302 voidpf zcalloc (opaque, items, size)
 303     voidpf opaque;
 304     unsigned items;
 305     unsigned size;
 306 {
 307     if (opaque) items += size - size; /* make compiler happy */
 308     return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
 309                               (voidpf)calloc(items, size);
 310 }
 311
 312 void  zcfree (opaque, ptr)
 313     voidpf opaque;
 314     voidpf ptr;
 315 {
 316     free(ptr);
 317     if (opaque) return; /* make compiler happy */
 318 }
 319
 320 #endif /* MY_ZCALLOC */