1 /* compress.c -- compress a memory buffer

     2  * Copyright (C) 1995-1998 Jean-loup Gailly.

     3  * For conditions of distribution and use, see copyright notice in zlib.h 

     4  */

     5 

     6 /* @(#) $Id$ */

     7 

     8 #include "OldEZlib.h"

     9 

    10 /* ===========================================================================

    11      Compresses the source buffer into the destination buffer. The level

    12    parameter has the same meaning as in deflateInit.  sourceLen is the byte

    13    length of the source buffer. Upon entry, destLen is the total size of the

    14    destination buffer, which must be at least 0.1% larger than sourceLen plus

    15    12 bytes. Upon exit, destLen is the actual size of the compressed buffer.

    16 

    17      compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough

    18    memory, Z_BUF_ERROR if there was not enough room in the output buffer,

    19    Z_STREAM_ERROR if the level parameter is invalid.

    20 */

    21 EXPORT_C int ZEXPORT compress2 (

    22     Bytef *dest,

    23     uLongf *destLen,

    24     const Bytef *source,

    25     uLong sourceLen,

    26     int level)

    27 {

    28     z_stream stream;

    29     int err;

    30 

    31     stream.next_in = (Bytef*)source;

    32     stream.avail_in = (uInt)sourceLen;

    33 #ifdef MAXSEG_64K

    34     /* Check for source > 64K on 16-bit machine: */

    35     if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;

    36 #endif

    37     stream.next_out = dest;

    38     stream.avail_out = (uInt)*destLen;

    39 //  if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR; Commented out by Markr to alleviate warnings

    40 

    41     stream.zalloc = (alloc_func)0;

    42     stream.zfree = (free_func)0;

    43     stream.opaque = (voidpf)0;

    44 

    45     err = deflateInit(&stream, level);

    46     if (err != Z_OK) return err;

    47 

    48     err = deflate(&stream, Z_FINISH);

    49     if (err != Z_STREAM_END) {

    50         deflateEnd(&stream);

    51         return err == Z_OK ? Z_BUF_ERROR : err;

    52     }

    53     *destLen = stream.total_out;

    54 

    55     err = deflateEnd(&stream);

    56     return err;

    57 }

    58 

    59 /* ===========================================================================

    60  */

    61 EXPORT_C int ZEXPORT compress (

    62     Bytef *dest,

    63     uLongf *destLen,

    64     const Bytef *source,

    65     uLong sourceLen)

    66 {

    67     return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);

    68 }