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<h1>Filter.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// This file may be redistributed and modified only under the terms of</span>
<a name="l00002"></a>00002 <span class="comment">// the GNU Lesser General Public License (See COPYING for details).</span>
<a name="l00003"></a>00003 <span class="comment">// Copyright (C) 2000-2001 Michael Day, Stefanus Du Toit</span>
<a name="l00004"></a>00004
<a name="l00005"></a>00005 <span class="preprocessor">#ifndef ATLAS_FILTER_H</span>
<a name="l00006"></a>00006 <span class="preprocessor"></span><span class="preprocessor">#define ATLAS_FILTER_H</span>
<a name="l00007"></a>00007 <span class="preprocessor"></span>
<a name="l00008"></a>00008 <span class="preprocessor">#include <iostream></span>
<a name="l00009"></a>00009 <span class="preprocessor">#include <string></span>
<a name="l00010"></a>00010
<a name="l00011"></a>00011 <span class="keyword">namespace </span>Atlas {
<a name="l00012"></a>00012
<a name="l00027"></a><a class="code" href="class_atlas_1_1_filter.html">00027</a> <span class="keyword">class </span><a class="code" href="class_atlas_1_1_filter.html" title="Atlas stream filter.">Filter</a>
<a name="l00028"></a>00028 {
<a name="l00029"></a>00029 <span class="keyword">public</span>:
<a name="l00030"></a>00030
<a name="l00031"></a>00031 <a class="code" href="class_atlas_1_1_filter.html" title="Atlas stream filter.">Filter</a>(<a class="code" href="class_atlas_1_1_filter.html" title="Atlas stream filter.">Filter</a>* = 0);
<a name="l00032"></a>00032 <span class="keyword">virtual</span> ~<a class="code" href="class_atlas_1_1_filter.html" title="Atlas stream filter.">Filter</a>();
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="keyword">virtual</span> <span class="keywordtype">void</span> begin() = 0;
<a name="l00035"></a>00035 <span class="keyword">virtual</span> <span class="keywordtype">void</span> end() = 0;
<a name="l00036"></a>00036
<a name="l00037"></a>00037 <span class="keyword">virtual</span> std::string encode(<span class="keyword">const</span> std::string&) = 0;
<a name="l00038"></a>00038 <span class="keyword">virtual</span> std::string decode(<span class="keyword">const</span> std::string&) = 0;
<a name="l00039"></a>00039
<a name="l00040"></a>00040 <span class="keyword">enum</span> Type
<a name="l00041"></a>00041 {
<a name="l00042"></a>00042 CHECKSUM,
<a name="l00043"></a>00043 COMPRESSION,
<a name="l00044"></a>00044 ENCRYPTION
<a name="l00045"></a>00045 };
<a name="l00046"></a>00046
<a name="l00047"></a>00047 <span class="keyword">protected</span>:
<a name="l00048"></a>00048
<a name="l00049"></a>00049 <a class="code" href="class_atlas_1_1_filter.html" title="Atlas stream filter.">Filter</a>* m_next;
<a name="l00050"></a>00050 };
<a name="l00051"></a>00051
<a name="l00052"></a>00052 <span class="keyword">typedef</span> <span class="keywordtype">int</span> int_type;
<a name="l00053"></a>00053
<a name="l00054"></a>00054 <span class="keyword">class </span>filterbuf : <span class="keyword">public</span> std::streambuf {
<a name="l00055"></a>00055
<a name="l00056"></a>00056 <span class="keyword">public</span>:
<a name="l00057"></a>00057
<a name="l00058"></a>00058 filterbuf(std::streambuf& buffer,
<a name="l00059"></a>00059 <a class="code" href="class_atlas_1_1_filter.html" title="Atlas stream filter.">Filter</a>& filter)
<a name="l00060"></a>00060 : m_streamBuffer(buffer), m_filter(filter)
<a name="l00061"></a>00061 {
<a name="l00062"></a>00062 setp(m_outBuffer, m_outBuffer + (m_outBufferSize - 1));
<a name="l00063"></a>00063 setg(m_inBuffer + m_inPutback, m_inBuffer + m_inPutback,
<a name="l00064"></a>00064 m_inBuffer + m_inPutback);
<a name="l00065"></a>00065 }
<a name="l00066"></a>00066
<a name="l00067"></a>00067 <span class="keyword">virtual</span> ~filterbuf();
<a name="l00068"></a>00068
<a name="l00069"></a>00069 <span class="keyword">protected</span>:
<a name="l00070"></a>00070 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> m_outBufferSize = 10;
<a name="l00071"></a>00071 <span class="keywordtype">char</span> m_outBuffer[m_outBufferSize];
<a name="l00072"></a>00072
<a name="l00073"></a>00073 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> m_inBufferSize = 10;
<a name="l00074"></a>00074 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> m_inPutback = 4;
<a name="l00075"></a>00075 <span class="keywordtype">char</span> m_inBuffer[m_inBufferSize];
<a name="l00076"></a>00076
<a name="l00077"></a>00077 <span class="keywordtype">int</span> flushOutBuffer()
<a name="l00078"></a>00078 {
<a name="l00079"></a>00079 <span class="keywordtype">int</span> num = pptr() - pbase();
<a name="l00080"></a>00080 std::string encoded = m_filter.encode(std::string(pbase(), pptr()));
<a name="l00081"></a>00081 m_streamBuffer.sputn(encoded.c_str(), (long) encoded.size());
<a name="l00082"></a>00082 pbump(-num);
<a name="l00083"></a>00083 <span class="keywordflow">return</span> num;
<a name="l00084"></a>00084 }
<a name="l00085"></a>00085
<a name="l00086"></a>00086 <span class="keyword">virtual</span> int_type overflow(int_type c);
<a name="l00087"></a>00087 <span class="keyword">virtual</span> int_type underflow();
<a name="l00088"></a>00088 <span class="keyword">virtual</span> <span class="keywordtype">int</span> sync();
<a name="l00089"></a>00089
<a name="l00090"></a>00090 <span class="keyword">private</span>:
<a name="l00091"></a>00091
<a name="l00092"></a>00092 std::streambuf& m_streamBuffer;
<a name="l00093"></a>00093 Filter& m_filter;
<a name="l00094"></a>00094 };
<a name="l00095"></a>00095
<a name="l00096"></a>00096 } <span class="comment">// Atlas namespace</span>
<a name="l00097"></a>00097
<a name="l00098"></a>00098 <span class="preprocessor">#endif</span>
</pre></div></div>
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