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<title>Crypto++: zdeflate.h Source File</title>
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<h1>zdeflate.h</h1> </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#ifndef CRYPTOPP_ZDEFLATE_H</span>
<a name="l00002"></a>00002 <span class="preprocessor"></span><span class="preprocessor">#define CRYPTOPP_ZDEFLATE_H</span>
<a name="l00003"></a>00003 <span class="preprocessor"></span>
<a name="l00004"></a>00004 <span class="preprocessor">#include "<a class="code" href="filters_8h.html">filters.h</a>"</span>
<a name="l00005"></a>00005 <span class="preprocessor">#include "misc.h"</span>
<a name="l00006"></a>00006
<a name="l00007"></a>00007 NAMESPACE_BEGIN(CryptoPP)
<a name="l00008"></a>00008
<a name="l00009"></a>00009 <span class="comment">//! _</span>
<a name="l00010"></a><a class="code" href="class_low_first_bit_writer.html">00010</a> <span class="comment"></span>class <a class="code" href="class_low_first_bit_writer.html" title="_">LowFirstBitWriter</a> : public <a class="code" href="class_filter.html" title="provides an implementation of BufferedTransformation&#39;s attachment interface">Filter</a>
<a name="l00011"></a>00011 {
<a name="l00012"></a>00012 <span class="keyword">public</span>:
<a name="l00013"></a>00013 <a class="code" href="class_low_first_bit_writer.html" title="_">LowFirstBitWriter</a>(<a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> *attachment);
<a name="l00014"></a>00014 <span class="keywordtype">void</span> PutBits(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> value, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length);
<a name="l00015"></a>00015 <span class="keywordtype">void</span> FlushBitBuffer();
<a name="l00016"></a>00016 <span class="keywordtype">void</span> ClearBitBuffer();
<a name="l00017"></a>00017
<a name="l00018"></a>00018 <span class="keywordtype">void</span> StartCounting();
<a name="l00019"></a>00019 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> FinishCounting();
<a name="l00020"></a>00020
<a name="l00021"></a>00021 <span class="keyword">protected</span>:
<a name="l00022"></a>00022 <span class="keywordtype">bool</span> m_counting;
<a name="l00023"></a>00023 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> m_bitCount;
<a name="l00024"></a>00024 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> m_buffer;
<a name="l00025"></a>00025 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> m_bitsBuffered, m_bytesBuffered;
<a name="l00026"></a>00026 <a class="code" href="class_fixed_size_sec_block.html">FixedSizeSecBlock<byte, 256></a> m_outputBuffer;
<a name="l00027"></a>00027 };
<a name="l00028"></a>00028 <span class="comment"></span>
<a name="l00029"></a>00029 <span class="comment">//! Huffman Encoder</span>
<a name="l00030"></a><a class="code" href="class_huffman_encoder.html">00030</a> <span class="comment"></span><span class="keyword">class </span><a class="code" href="class_huffman_encoder.html" title="Huffman Encoder.">HuffmanEncoder</a>
<a name="l00031"></a>00031 {
<a name="l00032"></a>00032 <span class="keyword">public</span>:
<a name="l00033"></a>00033 <span class="keyword">typedef</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> code_t;
<a name="l00034"></a>00034 <span class="keyword">typedef</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> value_t;
<a name="l00035"></a>00035
<a name="l00036"></a>00036 <a class="code" href="class_huffman_encoder.html" title="Huffman Encoder.">HuffmanEncoder</a>() {}
<a name="l00037"></a>00037 <a class="code" href="class_huffman_encoder.html" title="Huffman Encoder.">HuffmanEncoder</a>(<span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> *codeBits, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> nCodes);
<a name="l00038"></a>00038 <span class="keywordtype">void</span> Initialize(<span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> *codeBits, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> nCodes);
<a name="l00039"></a>00039
<a name="l00040"></a>00040 <span class="keyword">static</span> <span class="keywordtype">void</span> GenerateCodeLengths(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> *codeBits, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> maxCodeBits, <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> *codeCounts, <span class="keywordtype">size_t</span> nCodes);
<a name="l00041"></a>00041
<a name="l00042"></a>00042 <span class="keywordtype">void</span> Encode(<a class="code" href="class_low_first_bit_writer.html" title="_">LowFirstBitWriter</a> &writer, value_t value) <span class="keyword">const</span>;
<a name="l00043"></a>00043
<a name="l00044"></a><a class="code" href="struct_huffman_encoder_1_1_code.html">00044</a> <span class="keyword">struct </span><a class="code" href="struct_huffman_encoder_1_1_code.html">Code</a>
<a name="l00045"></a>00045 {
<a name="l00046"></a>00046 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> code;
<a name="l00047"></a>00047 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> len;
<a name="l00048"></a>00048 };
<a name="l00049"></a>00049
<a name="l00050"></a>00050 <a class="code" href="class_sec_block.html">SecBlock<Code></a> m_valueToCode;
<a name="l00051"></a>00051 };
<a name="l00052"></a>00052 <span class="comment"></span>
<a name="l00053"></a>00053 <span class="comment">//! DEFLATE (RFC 1951) compressor</span>
<a name="l00054"></a>00054 <span class="comment"></span>
<a name="l00055"></a><a class="code" href="class_deflator.html">00055</a> <span class="keyword">class </span><a class="code" href="class_deflator.html" title="DEFLATE (RFC 1951) compressor.">Deflator</a> : <span class="keyword">public</span> <a class="code" href="class_low_first_bit_writer.html" title="_">LowFirstBitWriter</a>
<a name="l00056"></a>00056 {
<a name="l00057"></a>00057 <span class="keyword">public</span>:
<a name="l00058"></a>00058 <span class="keyword">enum</span> {MIN_DEFLATE_LEVEL = 0, DEFAULT_DEFLATE_LEVEL = 6, MAX_DEFLATE_LEVEL = 9};
<a name="l00059"></a>00059 <span class="keyword">enum</span> {MIN_LOG2_WINDOW_SIZE = 9, DEFAULT_LOG2_WINDOW_SIZE = 15, MAX_LOG2_WINDOW_SIZE = 15};<span class="comment"></span>
<a name="l00060"></a>00060 <span class="comment"> /*! \note detectUncompressible makes it faster to process uncompressible files, but</span>
<a name="l00061"></a>00061 <span class="comment"> if a file has both compressible and uncompressible parts, it may fail to compress some of the</span>
<a name="l00062"></a>00062 <span class="comment"> compressible parts. */</span>
<a name="l00063"></a>00063 <a class="code" href="class_deflator.html#aee81a8ccc99647834b079bbcb70e4027">Deflator</a>(<a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> *attachment=NULL, <span class="keywordtype">int</span> deflateLevel=DEFAULT_DEFLATE_LEVEL, <span class="keywordtype">int</span> log2WindowSize=DEFAULT_LOG2_WINDOW_SIZE, <span class="keywordtype">bool</span> detectUncompressible=<span class="keyword">true</span>);<span class="comment"></span>
<a name="l00064"></a>00064 <span class="comment"> //! possible parameter names: Log2WindowSize, DeflateLevel, DetectUncompressible</span>
<a name="l00065"></a>00065 <span class="comment"></span> <a class="code" href="class_deflator.html#aee81a8ccc99647834b079bbcb70e4027">Deflator</a>(<span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html" title="interface for retrieving values given their names">NameValuePairs</a> &parameters, <a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> *attachment=NULL);
<a name="l00066"></a>00066 <span class="comment"></span>
<a name="l00067"></a>00067 <span class="comment"> //! this function can be used to set the deflate level in the middle of compression</span>
<a name="l00068"></a>00068 <span class="comment"></span> <span class="keywordtype">void</span> <a class="code" href="class_deflator.html#a5b19de812080b7b12d0a6cc974f60b33" title="this function can be used to set the deflate level in the middle of compression">SetDeflateLevel</a>(<span class="keywordtype">int</span> deflateLevel);
<a name="l00069"></a>00069 <span class="keywordtype">int</span> GetDeflateLevel()<span class="keyword"> const </span>{<span class="keywordflow">return</span> m_deflateLevel;}
<a name="l00070"></a>00070 <span class="keywordtype">int</span> GetLog2WindowSize()<span class="keyword"> const </span>{<span class="keywordflow">return</span> m_log2WindowSize;}
<a name="l00071"></a>00071
<a name="l00072"></a>00072 <span class="keywordtype">void</span> IsolatedInitialize(<span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html" title="interface for retrieving values given their names">NameValuePairs</a> &parameters);
<a name="l00073"></a>00073 <span class="keywordtype">size_t</span> <a class="code" href="class_deflator.html#ab3ba26f52807a9b5d4af6948d56cd4a9" title="input multiple bytes for blocking or non-blocking processing">Put2</a>(<span class="keyword">const</span> byte *inString, <span class="keywordtype">size_t</span> length, <span class="keywordtype">int</span> messageEnd, <span class="keywordtype">bool</span> blocking);
<a name="l00074"></a>00074 <span class="keywordtype">bool</span> IsolatedFlush(<span class="keywordtype">bool</span> hardFlush, <span class="keywordtype">bool</span> blocking);
<a name="l00075"></a>00075
<a name="l00076"></a>00076 <span class="keyword">protected</span>:
<a name="l00077"></a>00077 <span class="keyword">virtual</span> <span class="keywordtype">void</span> WritePrestreamHeader() {}
<a name="l00078"></a>00078 <span class="keyword">virtual</span> <span class="keywordtype">void</span> ProcessUncompressedData(<span class="keyword">const</span> byte *<span class="keywordtype">string</span>, <span class="keywordtype">size_t</span> length) {}
<a name="l00079"></a>00079 <span class="keyword">virtual</span> <span class="keywordtype">void</span> WritePoststreamTail() {}
<a name="l00080"></a>00080
<a name="l00081"></a>00081 <span class="keyword">enum</span> {STORED = 0, STATIC = 1, DYNAMIC = 2};
<a name="l00082"></a>00082 <span class="keyword">enum</span> {MIN_MATCH = 3, MAX_MATCH = 258};
<a name="l00083"></a>00083
<a name="l00084"></a>00084 <span class="keywordtype">void</span> InitializeStaticEncoders();
<a name="l00085"></a>00085 <span class="keywordtype">void</span> Reset(<span class="keywordtype">bool</span> forceReset = <span class="keyword">false</span>);
<a name="l00086"></a>00086 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> FillWindow(<span class="keyword">const</span> byte *str, <span class="keywordtype">size_t</span> length);
<a name="l00087"></a>00087 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> ComputeHash(<span class="keyword">const</span> byte *str) <span class="keyword">const</span>;
<a name="l00088"></a>00088 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> LongestMatch(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> &bestMatch) <span class="keyword">const</span>;
<a name="l00089"></a>00089 <span class="keywordtype">void</span> InsertString(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> start);
<a name="l00090"></a>00090 <span class="keywordtype">void</span> ProcessBuffer();
<a name="l00091"></a>00091
<a name="l00092"></a>00092 <span class="keywordtype">void</span> LiteralByte(byte b);
<a name="l00093"></a>00093 <span class="keywordtype">void</span> MatchFound(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> distance, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length);
<a name="l00094"></a>00094 <span class="keywordtype">void</span> EncodeBlock(<span class="keywordtype">bool</span> eof, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> blockType);
<a name="l00095"></a>00095 <span class="keywordtype">void</span> EndBlock(<span class="keywordtype">bool</span> eof);
<a name="l00096"></a>00096
<a name="l00097"></a><a class="code" href="struct_deflator_1_1_encoded_match.html">00097</a> <span class="keyword">struct </span><a class="code" href="struct_deflator_1_1_encoded_match.html">EncodedMatch</a>
<a name="l00098"></a>00098 {
<a name="l00099"></a>00099 <span class="keywordtype">unsigned</span> literalCode : 9;
<a name="l00100"></a>00100 <span class="keywordtype">unsigned</span> literalExtra : 5;
<a name="l00101"></a>00101 <span class="keywordtype">unsigned</span> distanceCode : 5;
<a name="l00102"></a>00102 <span class="keywordtype">unsigned</span> distanceExtra : 13;
<a name="l00103"></a>00103 };
<a name="l00104"></a>00104
<a name="l00105"></a>00105 <span class="keywordtype">int</span> m_deflateLevel, m_log2WindowSize, m_compressibleDeflateLevel;
<a name="l00106"></a>00106 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> m_detectSkip, m_detectCount;
<a name="l00107"></a>00107 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> DSIZE, DMASK, HSIZE, HMASK, GOOD_MATCH, MAX_LAZYLENGTH, MAX_CHAIN_LENGTH;
<a name="l00108"></a>00108 <span class="keywordtype">bool</span> m_headerWritten, m_matchAvailable;
<a name="l00109"></a>00109 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> m_dictionaryEnd, m_stringStart, m_lookahead, m_minLookahead, m_previousMatch, m_previousLength;
<a name="l00110"></a>00110 <a class="code" href="class_huffman_encoder.html" title="Huffman Encoder.">HuffmanEncoder</a> m_staticLiteralEncoder, m_staticDistanceEncoder, m_dynamicLiteralEncoder, m_dynamicDistanceEncoder;
<a name="l00111"></a>00111 <a class="code" href="class_sec_block.html">SecByteBlock</a> m_byteBuffer;
<a name="l00112"></a>00112 <a class="code" href="class_sec_block.html">SecBlock<word16></a> m_head, m_prev;
<a name="l00113"></a>00113 <a class="code" href="class_fixed_size_sec_block.html">FixedSizeSecBlock<unsigned int, 286></a> m_literalCounts;
<a name="l00114"></a>00114 <a class="code" href="class_fixed_size_sec_block.html">FixedSizeSecBlock<unsigned int, 30></a> m_distanceCounts;
<a name="l00115"></a>00115 <a class="code" href="class_sec_block.html">SecBlock<EncodedMatch></a> m_matchBuffer;
<a name="l00116"></a>00116 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> m_matchBufferEnd, m_blockStart, m_blockLength;
<a name="l00117"></a>00117 };
<a name="l00118"></a>00118
<a name="l00119"></a>00119 NAMESPACE_END
<a name="l00120"></a>00120
<a name="l00121"></a>00121 <span class="preprocessor">#endif</span>
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