zlib123/zutil.c
author Ryan C. Gordon <icculus@icculus.org>
Wed, 03 Oct 2018 22:45:05 -0400
branchstable-1.0
changeset 1648 93b4c3bc6b9d
parent 719 7b4677a8de6e
permissions -rw-r--r--
Fixed Win10's GetUserProfileDirectory() bug in stable-1.0 branch.
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/* zutil.c -- target dependent utility functions for the compression library
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 * Copyright (C) 1995-2005 Jean-loup Gailly.
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 * For conditions of distribution and use, see copyright notice in zlib.h
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 */
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/* @(#) $Id$ */
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#include "zutil.h"
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#ifndef NO_DUMMY_DECL
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struct internal_state      {int dummy;}; /* for buggy compilers */
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#endif
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const char * const z_errmsg[10] = {
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"need dictionary",     /* Z_NEED_DICT       2  */
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"stream end",          /* Z_STREAM_END      1  */
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"",                    /* Z_OK              0  */
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"file error",          /* Z_ERRNO         (-1) */
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"stream error",        /* Z_STREAM_ERROR  (-2) */
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"data error",          /* Z_DATA_ERROR    (-3) */
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"insufficient memory", /* Z_MEM_ERROR     (-4) */
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"buffer error",        /* Z_BUF_ERROR     (-5) */
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"incompatible version",/* Z_VERSION_ERROR (-6) */
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""};
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const char * ZEXPORT zlibVersion()
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{
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    return ZLIB_VERSION;
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}
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uLong ZEXPORT zlibCompileFlags()
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{
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    uLong flags;
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    flags = 0;
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    switch (sizeof(uInt)) {
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    case 2:     break;
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    case 4:     flags += 1;     break;
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    case 8:     flags += 2;     break;
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    default:    flags += 3;
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    }
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    switch (sizeof(uLong)) {
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    case 2:     break;
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    case 4:     flags += 1 << 2;        break;
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    case 8:     flags += 2 << 2;        break;
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    default:    flags += 3 << 2;
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    }
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    switch (sizeof(voidpf)) {
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    case 2:     break;
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    case 4:     flags += 1 << 4;        break;
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    case 8:     flags += 2 << 4;        break;
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    default:    flags += 3 << 4;
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    }
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    switch (sizeof(z_off_t)) {
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    case 2:     break;
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    case 4:     flags += 1 << 6;        break;
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    case 8:     flags += 2 << 6;        break;
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    default:    flags += 3 << 6;
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    }
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#ifdef DEBUG
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    flags += 1 << 8;
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#endif
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#if defined(ASMV) || defined(ASMINF)
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    flags += 1 << 9;
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#endif
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#ifdef ZLIB_WINAPI
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    flags += 1 << 10;
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#endif
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#ifdef BUILDFIXED
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    flags += 1 << 12;
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#endif
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#ifdef DYNAMIC_CRC_TABLE
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    flags += 1 << 13;
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#endif
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#ifdef NO_GZCOMPRESS
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    flags += 1L << 16;
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#endif
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#ifdef NO_GZIP
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    flags += 1L << 17;
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#endif
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#ifdef PKZIP_BUG_WORKAROUND
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    flags += 1L << 20;
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#endif
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#ifdef FASTEST
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    flags += 1L << 21;
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#endif
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#ifdef STDC
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#  ifdef NO_vsnprintf
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        flags += 1L << 25;
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#    ifdef HAS_vsprintf_void
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        flags += 1L << 26;
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#    endif
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#  else
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#    ifdef HAS_vsnprintf_void
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        flags += 1L << 26;
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#    endif
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#  endif
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#else
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        flags += 1L << 24;
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#  ifdef NO_snprintf
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        flags += 1L << 25;
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#    ifdef HAS_sprintf_void
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        flags += 1L << 26;
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#    endif
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#  else
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#    ifdef HAS_snprintf_void
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        flags += 1L << 26;
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#    endif
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#  endif
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#endif
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    return flags;
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}
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#ifdef DEBUG
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#  ifndef verbose
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#    define verbose 0
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#  endif
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int z_verbose = verbose;
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void z_error (m)
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    char *m;
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{
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    fprintf(stderr, "%s\n", m);
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    exit(1);
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}
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#endif
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/* exported to allow conversion of error code to string for compress() and
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 * uncompress()
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 */
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const char * ZEXPORT zError(err)
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    int err;
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{
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    return ERR_MSG(err);
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   137
}
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   138
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   139
#if defined(_WIN32_WCE)
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   140
    /* The Microsoft C Run-Time Library for Windows CE doesn't have
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   141
     * errno.  We define it as a global variable to simplify porting.
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   142
     * Its value is always 0 and should not be used.
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   143
     */
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   144
    int errno = 0;
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   145
#endif
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   146
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#ifndef HAVE_MEMCPY
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   148
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void zmemcpy(dest, source, len)
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   150
    Bytef* dest;
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   151
    const Bytef* source;
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    uInt  len;
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{
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   154
    if (len == 0) return;
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   155
    do {
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   156
        *dest++ = *source++; /* ??? to be unrolled */
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   157
    } while (--len != 0);
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   158
}
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   159
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   160
int zmemcmp(s1, s2, len)
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   161
    const Bytef* s1;
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   162
    const Bytef* s2;
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   163
    uInt  len;
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   164
{
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   165
    uInt j;
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   166
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   167
    for (j = 0; j < len; j++) {
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   168
        if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   169
    }
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   170
    return 0;
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diff changeset
   171
}
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   172
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   173
void zmemzero(dest, len)
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   174
    Bytef* dest;
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   175
    uInt  len;
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diff changeset
   176
{
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   177
    if (len == 0) return;
7b4677a8de6e Moved to zlib 1.2.3 proper.
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diff changeset
   178
    do {
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   179
        *dest++ = 0;  /* ??? to be unrolled */
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   180
    } while (--len != 0);
7b4677a8de6e Moved to zlib 1.2.3 proper.
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diff changeset
   181
}
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   182
#endif
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   183
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   184
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   185
#ifdef SYS16BIT
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   186
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   187
#ifdef __TURBOC__
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   188
/* Turbo C in 16-bit mode */
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   189
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   190
#  define MY_ZCALLOC
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   191
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   192
/* Turbo C malloc() does not allow dynamic allocation of 64K bytes
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   193
 * and farmalloc(64K) returns a pointer with an offset of 8, so we
7b4677a8de6e Moved to zlib 1.2.3 proper.
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diff changeset
   194
 * must fix the pointer. Warning: the pointer must be put back to its
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   195
 * original form in order to free it, use zcfree().
7b4677a8de6e Moved to zlib 1.2.3 proper.
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diff changeset
   196
 */
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   197
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   198
#define MAX_PTR 10
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   199
/* 10*64K = 640K */
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   200
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   201
local int next_ptr = 0;
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   202
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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   203
typedef struct ptr_table_s {
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   204
    voidpf org_ptr;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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   205
    voidpf new_ptr;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   206
} ptr_table;
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   207
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   208
local ptr_table table[MAX_PTR];
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   209
/* This table is used to remember the original form of pointers
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   210
 * to large buffers (64K). Such pointers are normalized with a zero offset.
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   211
 * Since MSDOS is not a preemptive multitasking OS, this table is not
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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   212
 * protected from concurrent access. This hack doesn't work anyway on
7b4677a8de6e Moved to zlib 1.2.3 proper.
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   213
 * a protected system like OS/2. Use Microsoft C instead.
7b4677a8de6e Moved to zlib 1.2.3 proper.
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diff changeset
   214
 */
7b4677a8de6e Moved to zlib 1.2.3 proper.
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diff changeset
   215
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   216
voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   217
{
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   218
    voidpf buf = opaque; /* just to make some compilers happy */
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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   219
    ulg bsize = (ulg)items*size;
7b4677a8de6e Moved to zlib 1.2.3 proper.
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diff changeset
   220
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   221
    /* If we allocate less than 65520 bytes, we assume that farmalloc
7b4677a8de6e Moved to zlib 1.2.3 proper.
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diff changeset
   222
     * will return a usable pointer which doesn't have to be normalized.
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   223
     */
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   224
    if (bsize < 65520L) {
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   225
        buf = farmalloc(bsize);
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   226
        if (*(ush*)&buf != 0) return buf;
7b4677a8de6e Moved to zlib 1.2.3 proper.
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diff changeset
   227
    } else {
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   228
        buf = farmalloc(bsize + 16L);
7b4677a8de6e Moved to zlib 1.2.3 proper.
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diff changeset
   229
    }
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   230
    if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   231
    table[next_ptr].org_ptr = buf;
7b4677a8de6e Moved to zlib 1.2.3 proper.
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diff changeset
   232
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   233
    /* Normalize the pointer to seg:0 */
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   234
    *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   235
    *(ush*)&buf = 0;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   236
    table[next_ptr++].new_ptr = buf;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   237
    return buf;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   238
}
7b4677a8de6e Moved to zlib 1.2.3 proper.
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diff changeset
   239
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   240
void  zcfree (voidpf opaque, voidpf ptr)
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   241
{
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   242
    int n;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   243
    if (*(ush*)&ptr != 0) { /* object < 64K */
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   244
        farfree(ptr);
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   245
        return;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   246
    }
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   247
    /* Find the original pointer */
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   248
    for (n = 0; n < next_ptr; n++) {
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   249
        if (ptr != table[n].new_ptr) continue;
7b4677a8de6e Moved to zlib 1.2.3 proper.
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diff changeset
   250
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   251
        farfree(table[n].org_ptr);
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   252
        while (++n < next_ptr) {
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   253
            table[n-1] = table[n];
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   254
        }
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   255
        next_ptr--;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   256
        return;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   257
    }
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   258
    ptr = opaque; /* just to make some compilers happy */
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   259
    Assert(0, "zcfree: ptr not found");
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   260
}
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   261
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   262
#endif /* __TURBOC__ */
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   263
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   264
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   265
#ifdef M_I86
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   266
/* Microsoft C in 16-bit mode */
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   267
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   268
#  define MY_ZCALLOC
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   269
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   270
#if (!defined(_MSC_VER) || (_MSC_VER <= 600))
7b4677a8de6e Moved to zlib 1.2.3 proper.
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diff changeset
   271
#  define _halloc  halloc
7b4677a8de6e Moved to zlib 1.2.3 proper.
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#  define _hfree   hfree
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#endif
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voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
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{
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    if (opaque) opaque = 0; /* to make compiler happy */
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    return _halloc((long)items, size);
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}
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void  zcfree (voidpf opaque, voidpf ptr)
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{
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    if (opaque) opaque = 0; /* to make compiler happy */
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    _hfree(ptr);
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}
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#endif /* M_I86 */
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#endif /* SYS16BIT */
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#ifndef MY_ZCALLOC /* Any system without a special alloc function */
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#ifndef STDC
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extern voidp  malloc OF((uInt size));
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extern voidp  calloc OF((uInt items, uInt size));
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extern void   free   OF((voidpf ptr));
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#endif
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voidpf zcalloc (opaque, items, size)
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    voidpf opaque;
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    unsigned items;
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    unsigned size;
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{
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    if (opaque) items += size - size; /* make compiler happy */
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    return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
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                              (voidpf)calloc(items, size);
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}
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void  zcfree (opaque, ptr)
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    voidpf opaque;
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    voidpf ptr;
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{
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    free(ptr);
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    if (opaque) return; /* make compiler happy */
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}
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#endif /* MY_ZCALLOC */