SecurityServer/MacYarrow/zlib/zutil.c

   1 /*
   2  * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * The contents of this file constitute Original Code as defined in and are
   5  * subject to the Apple Public Source License Version 1.2 (the 'License').
   6  * You may not use this file except in compliance with the License. Please obtain
   7  * a copy of the License at http://www.apple.com/publicsource and read it before
   8  * using this file.
   9  *
  10  * This Original Code and all software distributed under the License are
  11  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
  12  * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
  13  * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  14  * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
  15  * specific language governing rights and limitations under the License.
  16  */
  17
  18
  19 /* zutil.c -- target dependent utility functions for the compression library
  20  * Copyright (C) 1995-1998 Jean-loup Gailly.
  21  * For conditions of distribution and use, see copyright notice in zlib.h
  22  */
  23
  24 /* @(#) $Id: zutil.c,v 1.1.1.1 2001/05/18 23:14:03 mb Exp $ */
  25
  26 #include "zutil.h"
  27
  28 struct internal_state      {int dummy;}; /* for buggy compilers */
  29
  30 #ifndef STDC
  31 extern void exit OF((int));
  32 #endif
  33
  34 const char *z_errmsg[10] = {
  35 "need dictionary",     /* Z_NEED_DICT       2  */
  36 "stream end",          /* Z_STREAM_END      1  */
  37 "",                    /* Z_OK              0  */
  38 "file error",          /* Z_ERRNO         (-1) */
  39 "stream error",        /* Z_STREAM_ERROR  (-2) */
  40 "data error",          /* Z_DATA_ERROR    (-3) */
  41 "insufficient memory", /* Z_MEM_ERROR     (-4) */
  42 "buffer error",        /* Z_BUF_ERROR     (-5) */
  43 "incompatible version",/* Z_VERSION_ERROR (-6) */
  44 ""};
  45
  46
  47 const char * ZEXPORT zlibVersion()
  48 {
  49     return ZLIB_VERSION;
  50 }
  51
  52 #ifdef DEBUG
  53
  54 #  ifndef verbose
  55 #    define verbose 0
  56 #  endif
  57 int z_verbose = verbose;
  58
  59 void z_error (m)
  60     char *m;
  61 {
  62     fprintf(stderr, "%s\n", m);
  63     exit(1);
  64 }
  65 #endif
  66
  67 /* exported to allow conversion of error code to string for compress() and
  68  * uncompress()
  69  */
  70 const char * ZEXPORT zError(err)
  71     int err;
  72 {
  73     return ERR_MSG(err);
  74 }
  75
  76
  77 #ifndef HAVE_MEMCPY
  78
  79 void zmemcpy(dest, source, len)
  80     Bytef* dest;
  81     const Bytef* source;
  82     uInt  len;
  83 {
  84     if (len == 0) return;
  85     do {
  86         *dest++ = *source++; /* ??? to be unrolled */
  87     } while (--len != 0);
  88 }
  89
  90 int zmemcmp(s1, s2, len)
  91     const Bytef* s1;
  92     const Bytef* s2;
  93     uInt  len;
  94 {
  95     uInt j;
  96
  97     for (j = 0; j < len; j++) {
  98         if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
  99     }
 100     return 0;
 101 }
 102
 103 void zmemzero(dest, len)
 104     Bytef* dest;
 105     uInt  len;
 106 {
 107     if (len == 0) return;
 108     do {
 109         *dest++ = 0;  /* ??? to be unrolled */
 110     } while (--len != 0);
 111 }
 112 #endif
 113
 114 #ifdef __TURBOC__
 115 #if (defined( __BORLANDC__) || !defined(SMALL_MEDIUM)) && !defined(__32BIT__)
 116 /* Small and medium model in Turbo C are for now limited to near allocation
 117  * with reduced MAX_WBITS and MAX_MEM_LEVEL
 118  */
 119 #  define MY_ZCALLOC
 120
 121 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
 122  * and farmalloc(64K) returns a pointer with an offset of 8, so we
 123  * must fix the pointer. Warning: the pointer must be put back to its
 124  * original form in order to free it, use zcfree().
 125  */
 126
 127 #define MAX_PTR 10
 128 /* 10*64K = 640K */
 129
 130 local int next_ptr = 0;
 131
 132 typedef struct ptr_table_s {
 133     voidpf org_ptr;
 134     voidpf new_ptr;
 135 } ptr_table;
 136
 137 local ptr_table table[MAX_PTR];
 138 /* This table is used to remember the original form of pointers
 139  * to large buffers (64K). Such pointers are normalized with a zero offset.
 140  * Since MSDOS is not a preemptive multitasking OS, this table is not
 141  * protected from concurrent access. This hack doesn't work anyway on
 142  * a protected system like OS/2. Use Microsoft C instead.
 143  */
 144
 145 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
 146 {
 147     voidpf buf = opaque; /* just to make some compilers happy */
 148     ulg bsize = (ulg)items*size;
 149
 150     /* If we allocate less than 65520 bytes, we assume that farmalloc
 151      * will return a usable pointer which doesn't have to be normalized.
 152      */
 153     if (bsize < 65520L) {
 154         buf = farmalloc(bsize);
 155         if (*(ush*)&buf != 0) return buf;
 156     } else {
 157         buf = farmalloc(bsize + 16L);
 158     }
 159     if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
 160     table[next_ptr].org_ptr = buf;
 161
 162     /* Normalize the pointer to seg:0 */
 163     *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
 164     *(ush*)&buf = 0;
 165     table[next_ptr++].new_ptr = buf;
 166     return buf;
 167 }
 168
 169 void  zcfree (voidpf opaque, voidpf ptr)
 170 {
 171     int n;
 172     if (*(ush*)&ptr != 0) { /* object < 64K */
 173         farfree(ptr);
 174         return;
 175     }
 176     /* Find the original pointer */
 177     for (n = 0; n < next_ptr; n++) {
 178         if (ptr != table[n].new_ptr) continue;
 179
 180         farfree(table[n].org_ptr);
 181         while (++n < next_ptr) {
 182             table[n-1] = table[n];
 183         }
 184         next_ptr--;
 185         return;
 186     }
 187     ptr = opaque; /* just to make some compilers happy */
 188     Assert(0, "zcfree: ptr not found");
 189 }
 190 #endif
 191 #endif /* __TURBOC__ */
 192
 193
 194 #if defined(M_I86) && !defined(__32BIT__)
 195 /* Microsoft C in 16-bit mode */
 196
 197 #  define MY_ZCALLOC
 198
 199 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
 200 #  define _halloc  halloc
 201 #  define _hfree   hfree
 202 #endif
 203
 204 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
 205 {
 206     if (opaque) opaque = 0; /* to make compiler happy */
 207     return _halloc((long)items, size);
 208 }
 209
 210 void  zcfree (voidpf opaque, voidpf ptr)
 211 {
 212     if (opaque) opaque = 0; /* to make compiler happy */
 213     _hfree(ptr);
 214 }
 215
 216 #endif /* MSC */
 217
 218
 219 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
 220
 221 #ifndef STDC
 222 extern voidp  calloc OF((uInt items, uInt size));
 223 extern void   free   OF((voidpf ptr));
 224 #endif
 225
 226 voidpf zcalloc (opaque, items, size)
 227     voidpf opaque;
 228     unsigned items;
 229     unsigned size;
 230 {
 231     if (opaque) items += size - size; /* make compiler happy */
 232     return (voidpf)calloc(items, size);
 233 }
 234
 235 void  zcfree (opaque, ptr)
 236     voidpf opaque;
 237     voidpf ptr;
 238 {
 239     free(ptr);
 240     if (opaque) return; /* make compiler happy */
 241 }
 242
 243 #endif /* MY_ZCALLOC */