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<html><!-- Created using the cpp_pretty_printer from the dlib C++ library.  See http://dlib.net for updates. --><head><title>dlib C++ Library - compress.c</title></head><body bgcolor='white'><pre>
<font color='#009900'>/* compress.c -- compress a memory buffer
 * Copyright (C) 1995-2005 Jean-loup Gailly.
 * For conditions of distribution and use, see copyright notice in zlib.h
 */</font>

<font color='#009900'>/* @(#) $Id$ */</font>

<font color='#0000FF'>#define</font> ZLIB_INTERNAL
<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='zlib.h.html'>zlib.h</a>"

<font color='#009900'>/* ===========================================================================
     Compresses the source buffer into the destination buffer. The level
   parameter has the same meaning as in deflateInit.  sourceLen is the byte
   length of the source buffer. Upon entry, destLen is the total size of the
   destination buffer, which must be at least 0.1% larger than sourceLen plus
   12 bytes. Upon exit, destLen is the actual size of the compressed buffer.

     compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
   memory, Z_BUF_ERROR if there was not enough room in the output buffer,
   Z_STREAM_ERROR if the level parameter is invalid.
*/</font>
<font color='#0000FF'><u>int</u></font> ZEXPORT <b><a name='compress2'></a>compress2</b> <font face='Lucida Console'>(</font>dest, destLen, source, sourceLen, level<font face='Lucida Console'>)</font>
    Bytef <font color='#5555FF'>*</font>dest;
    uLongf <font color='#5555FF'>*</font>destLen;
    <font color='#0000FF'>const</font> Bytef <font color='#5555FF'>*</font>source;
    uLong sourceLen;
    <font color='#0000FF'><u>int</u></font> level;
<b>{</b>
    z_stream stream;
    <font color='#0000FF'><u>int</u></font> err;

    stream.next_in <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>z_const Bytef <font color='#5555FF'>*</font><font face='Lucida Console'>)</font>source;
    stream.avail_in <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>uInt<font face='Lucida Console'>)</font>sourceLen;
<font color='#0000FF'>#ifdef</font> MAXSEG_64K
    <font color='#009900'>/* Check for source &gt; 64K on 16-bit machine: */</font>
    <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>uLong<font face='Lucida Console'>)</font>stream.avail_in <font color='#5555FF'>!</font><font color='#5555FF'>=</font> sourceLen<font face='Lucida Console'>)</font> <font color='#0000FF'>return</font> Z_BUF_ERROR;
<font color='#0000FF'>#endif</font>
    stream.next_out <font color='#5555FF'>=</font> dest;
    stream.avail_out <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>uInt<font face='Lucida Console'>)</font><font color='#5555FF'>*</font>destLen;
    <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>uLong<font face='Lucida Console'>)</font>stream.avail_out <font color='#5555FF'>!</font><font color='#5555FF'>=</font> <font color='#5555FF'>*</font>destLen<font face='Lucida Console'>)</font> <font color='#0000FF'>return</font> Z_BUF_ERROR;

    stream.zalloc <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>alloc_func<font face='Lucida Console'>)</font><font color='#979000'>0</font>;
    stream.zfree <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>free_func<font face='Lucida Console'>)</font><font color='#979000'>0</font>;
    stream.opaque <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>voidpf<font face='Lucida Console'>)</font><font color='#979000'>0</font>;

    err <font color='#5555FF'>=</font> <font color='#BB00BB'>deflateInit</font><font face='Lucida Console'>(</font><font color='#5555FF'>&amp;</font>stream, level<font face='Lucida Console'>)</font>;
    <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>err <font color='#5555FF'>!</font><font color='#5555FF'>=</font> Z_OK<font face='Lucida Console'>)</font> <font color='#0000FF'>return</font> err;

    err <font color='#5555FF'>=</font> <font color='#BB00BB'>deflate</font><font face='Lucida Console'>(</font><font color='#5555FF'>&amp;</font>stream, Z_FINISH<font face='Lucida Console'>)</font>;
    <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>err <font color='#5555FF'>!</font><font color='#5555FF'>=</font> Z_STREAM_END<font face='Lucida Console'>)</font> <b>{</b>
        <font color='#BB00BB'>deflateEnd</font><font face='Lucida Console'>(</font><font color='#5555FF'>&amp;</font>stream<font face='Lucida Console'>)</font>;
        <font color='#0000FF'>return</font> err <font color='#5555FF'>=</font><font color='#5555FF'>=</font> Z_OK ? Z_BUF_ERROR : err;
    <b>}</b>
    <font color='#5555FF'>*</font>destLen <font color='#5555FF'>=</font> stream.total_out;

    err <font color='#5555FF'>=</font> <font color='#BB00BB'>deflateEnd</font><font face='Lucida Console'>(</font><font color='#5555FF'>&amp;</font>stream<font face='Lucida Console'>)</font>;
    <font color='#0000FF'>return</font> err;
<b>}</b>

<font color='#009900'>/* ===========================================================================
 */</font>
<font color='#0000FF'><u>int</u></font> ZEXPORT <b><a name='compress'></a>compress</b> <font face='Lucida Console'>(</font>dest, destLen, source, sourceLen<font face='Lucida Console'>)</font>
    Bytef <font color='#5555FF'>*</font>dest;
    uLongf <font color='#5555FF'>*</font>destLen;
    <font color='#0000FF'>const</font> Bytef <font color='#5555FF'>*</font>source;
    uLong sourceLen;
<b>{</b>
    <font color='#0000FF'>return</font> <font color='#BB00BB'>compress2</font><font face='Lucida Console'>(</font>dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION<font face='Lucida Console'>)</font>;
<b>}</b>

<font color='#009900'>/* ===========================================================================
     If the default memLevel or windowBits for deflateInit() is changed, then
   this function needs to be updated.
 */</font>
uLong ZEXPORT <b><a name='compressBound'></a>compressBound</b> <font face='Lucida Console'>(</font>sourceLen<font face='Lucida Console'>)</font>
    uLong sourceLen;
<b>{</b>
    <font color='#0000FF'>return</font> sourceLen <font color='#5555FF'>+</font> <font face='Lucida Console'>(</font>sourceLen <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font> <font color='#979000'>12</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font face='Lucida Console'>(</font>sourceLen <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font> <font color='#979000'>14</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font>
           <font face='Lucida Console'>(</font>sourceLen <font color='#5555FF'>&gt;</font><font color='#5555FF'>&gt;</font> <font color='#979000'>25</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> <font color='#979000'>13</font>;
<b>}</b>

</pre></body></html>