zlib123/compress.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.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
719
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
     1
/* compress.c -- compress a memory buffer
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
     2
 * Copyright (C) 1995-2003 Jean-loup Gailly.
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
     3
 * For conditions of distribution and use, see copyright notice in zlib.h
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
     4
 */
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
     5
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
     6
/* @(#) $Id$ */
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
     7
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
     8
#define ZLIB_INTERNAL
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
     9
#include "zlib.h"
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    10
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    11
/* ===========================================================================
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    12
     Compresses the source buffer into the destination buffer. The level
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    13
   parameter has the same meaning as in deflateInit.  sourceLen is the byte
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    14
   length of the source buffer. Upon entry, destLen is the total size of the
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    15
   destination buffer, which must be at least 0.1% larger than sourceLen plus
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    16
   12 bytes. Upon exit, destLen is the actual size of the compressed buffer.
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    17
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    18
     compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    19
   memory, Z_BUF_ERROR if there was not enough room in the output buffer,
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    20
   Z_STREAM_ERROR if the level parameter is invalid.
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    21
*/
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    22
int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    23
    Bytef *dest;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    24
    uLongf *destLen;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    25
    const Bytef *source;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    26
    uLong sourceLen;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    27
    int level;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    28
{
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    29
    z_stream stream;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    30
    int err;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    31
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    32
    stream.next_in = (Bytef*)source;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    33
    stream.avail_in = (uInt)sourceLen;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    34
#ifdef MAXSEG_64K
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    35
    /* Check for source > 64K on 16-bit machine: */
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    36
    if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    37
#endif
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    38
    stream.next_out = dest;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    39
    stream.avail_out = (uInt)*destLen;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    40
    if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    41
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    42
    stream.zalloc = (alloc_func)0;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    43
    stream.zfree = (free_func)0;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    44
    stream.opaque = (voidpf)0;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    45
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    46
    err = deflateInit(&stream, level);
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    47
    if (err != Z_OK) return err;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    48
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    49
    err = deflate(&stream, Z_FINISH);
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    50
    if (err != Z_STREAM_END) {
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    51
        deflateEnd(&stream);
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    52
        return err == Z_OK ? Z_BUF_ERROR : err;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    53
    }
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    54
    *destLen = stream.total_out;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    55
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    56
    err = deflateEnd(&stream);
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    57
    return err;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    58
}
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    59
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    60
/* ===========================================================================
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    61
 */
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    62
int ZEXPORT compress (dest, destLen, source, sourceLen)
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    63
    Bytef *dest;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    64
    uLongf *destLen;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    65
    const Bytef *source;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    66
    uLong sourceLen;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    67
{
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    68
    return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    69
}
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    70
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    71
/* ===========================================================================
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    72
     If the default memLevel or windowBits for deflateInit() is changed, then
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    73
   this function needs to be updated.
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    74
 */
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    75
uLong ZEXPORT compressBound (sourceLen)
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    76
    uLong sourceLen;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    77
{
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    78
    return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) + 11;
7b4677a8de6e Moved to zlib 1.2.3 proper.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
    79
}