1 /* Portions Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).

     2  * All rights reserved.

     3  */

     4 

     5 /* compress.cpp -- compress a memory buffer

     6  * Copyright (C) 1995-2003 Jean-loup Gailly.

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

     8  */

     9 

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

    11 

    12 #define ZLIB_INTERNAL

    13 #include "libzcore.h"

    14 

    15 /* ===========================================================================

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

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

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

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

    20    12 bytes. Upon exit, destLen is the actual size of the compressed buffer.

    21 

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

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

    24    Z_STREAM_ERROR if the level parameter is invalid.

    25 */

    26 

    27 #ifdef __SYMBIAN32__

    28 EXPORT_C int  compress2_r (Bytef * dest, uLongf * destLen,const Bytef *  source,uLong  sourceLen,int level)

    29 #else

    30 int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)

    31     Bytef *dest;

    32     uLongf *destLen;

    33     const Bytef *source;

    34     uLong sourceLen;

    35     int level;

    36 #endif //__SYMBIAN32__

    37 {

    38     z_stream stream;

    39     int err;

    40 

    41     stream.next_in = (Bytef*)source;

    42     stream.avail_in = (uInt)sourceLen;

    43 #ifdef MAXSEG_64K

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

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

    46 #endif

    47     stream.next_out = dest;

    48     stream.avail_out = (uInt)*destLen;

    49     if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;

    50 

    51     stream.zalloc = (alloc_func)0;

    52     stream.zfree = (free_func)0;

    53     stream.opaque = (voidpf)0;

    54 

    55     err = deflateInit_r(&stream, level);

    56     if (err != Z_OK) return err;

    57 

    58     err = deflate_r(&stream, Z_FINISH);

    59     if (err != Z_STREAM_END) {

    60         deflateEnd_r(&stream);

    61         return err == Z_OK ? Z_BUF_ERROR : err;

    62     }

    63     *destLen = stream.total_out;

    64 

    65     err = deflateEnd_r(&stream);

    66     return err;

    67 }

    68 

    69 /* ===========================================================================

    70  */

    71 

    72 #ifdef __SYMBIAN32__

    73 EXPORT_C  int compress_r (Bytef * dest,    uLongf *  destLen,   const Bytef * source,  uLong  sourceLen)

    74 #else

    75 int ZEXPORT compress (dest, destLen, source, sourceLen)

    76     Bytef *dest;

    77     uLongf *destLen;

    78     const Bytef *source;

    79     uLong sourceLen;

    80 #endif //__SYMBIAN32__

    81 {

    82     return compress2_r(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);

    83 }

    84 

    85 

    86 /* ===========================================================================

    87      If the default memLevel or windowBits for deflateInit() is changed, then

    88    this function needs to be updated.

    89  */

    90  

    91 

    92 #ifdef __SYMBIAN32__

    93 EXPORT_C  uLong  compressBound_r (uLong sourceLen)

    94 #else  

    95 uLong ZEXPORT compressBound (sourceLen)

    96     uLong sourceLen;

    97 #endif //__SYMBIAN32__

    98 {

    99     return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) + 11;

   100 }

   101 

   102 

   103