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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Crypto++: zdeflate.h Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.3.2 --><div class="qindex"><a class="qindex" href="index.html">Main Page</a> | <a class="qindex" href="namespaces.html">Namespace List</a> | <a class="qindex" href="hierarchy.html">Class Hierarchy</a> | <a class="qindex" href="classes.html">Alphabetical List</a> | <a class="qindex" href="annotated.html">Compound List</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="namespacemembers.html">Namespace Members</a> | <a class="qindex" href="functions.html">Compound Members</a> | <a class="qindex" href="globals.html">File Members</a></div><h1>zdeflate.h</h1><div class="fragment"><pre>00001 <span class="preprocessor">#ifndef CRYPTOPP_ZDEFLATE_H</span>00002 <span class="preprocessor"></span><span class="preprocessor">#define CRYPTOPP_ZDEFLATE_H</span>00003 <span class="preprocessor"></span>00004 <span class="preprocessor">#include "filters.h"</span>00005 <span class="preprocessor">#include "misc.h"</span>00006 00007 NAMESPACE_BEGIN(CryptoPP)00008 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><span class="keyword">class </span><a class="code" href="class_low_first_bit_writer.html">LowFirstBitWriter</a> : <span class="keyword">public</span> <a class="code" href="class_filter.html">Filter</a>00011 {00012 <span class="keyword">public</span>:00013 <a class="code" href="class_low_first_bit_writer.html">LowFirstBitWriter</a>(<a class="code" href="class_buffered_transformation.html">BufferedTransformation</a> *attachment);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);00015 <span class="keywordtype">void</span> FlushBitBuffer();00016 <span class="keywordtype">void</span> ClearBitBuffer();00017 00018 <span class="keywordtype">void</span> StartCounting();00019 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> FinishCounting();00020 00021 <span class="keyword">protected</span>:00022 <span class="keywordtype">bool</span> m_counting;00023 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> m_bitCount;00024 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> m_buffer;00025 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> m_bitsBuffered, m_bytesBuffered;00026 FixedSizeSecBlock<byte, 256> m_outputBuffer;00027 };00028 <span class="comment"></span>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">HuffmanEncoder</a>00031 {00032 <span class="keyword">public</span>:00033 <span class="keyword">typedef</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> code_t;00034 <span class="keyword">typedef</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> value_t;00035 00036 <a class="code" href="class_huffman_encoder.html">HuffmanEncoder</a>() {}00037 <a class="code" href="class_huffman_encoder.html">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);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);00039 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">unsigned</span> <span class="keywordtype">int</span> nCodes);00041 00042 <span class="keywordtype">void</span> Encode(<a class="code" href="class_low_first_bit_writer.html">LowFirstBitWriter</a> &writer, value_t value) <span class="keyword">const</span>;00043 00044 <span class="keyword">struct </span>Code00045 {00046 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> code;00047 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> len;00048 };00049 00050 <a class="code" href="class_sec_block.html">SecBlock<Code></a> m_valueToCode;00051 };00052 <span class="comment"></span>00053 <span class="comment">//! DEFLATE (RFC 1951) compressor</span>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">Deflator</a> : <span class="keyword">public</span> <a class="code" href="class_low_first_bit_writer.html">LowFirstBitWriter</a>00056 {00057 <span class="keyword">public</span>:00058 <span class="keyword">enum</span> {MIN_DEFLATE_LEVEL = 0, DEFAULT_DEFLATE_LEVEL = 6, MAX_DEFLATE_LEVEL = 9};00059 <span class="keyword">enum</span> {MIN_LOG2_WINDOW_SIZE = 9, DEFAULT_LOG2_WINDOW_SIZE = 15, MAX_LOG2_WINDOW_SIZE = 15};00060 <a class="code" href="class_deflator.html#_deflatora1">Deflator</a>(<a class="code" href="class_buffered_transformation.html">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="comment"></span>00061 <span class="comment"> //! possible parameter names: Log2WindowSize, DeflateLevel</span>00062 <span class="comment"></span> <a class="code" href="class_deflator.html#_deflatora1">Deflator</a>(<span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html">NameValuePairs</a> &parameters, <a class="code" href="class_buffered_transformation.html">BufferedTransformation</a> *attachment=NULL);00063 <span class="comment"></span>00064 <span class="comment"> //! this function can be used to set the deflate level in the middle of compression</span>00065 <span class="comment"></span> <span class="keywordtype">void</span> <a class="code" href="class_deflator.html#_zlib_compressora3">SetDeflateLevel</a>(<span class="keywordtype">int</span> deflateLevel);00066 <span class="keywordtype">int</span> GetDeflateLevel()<span class="keyword"> const </span>{<span class="keywordflow">return</span> m_deflateLevel;}00067 <span class="keywordtype">int</span> GetLog2WindowSize()<span class="keyword"> const </span>{<span class="keywordflow">return</span> m_log2WindowSize;}00068 00069 <span class="keywordtype">void</span> IsolatedInitialize(<span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html">NameValuePairs</a> &parameters);00070 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="class_deflator.html#_zlib_compressora7">Put2</a>(<span class="keyword">const</span> byte *inString, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length, <span class="keywordtype">int</span> messageEnd, <span class="keywordtype">bool</span> blocking);00071 <span class="keywordtype">bool</span> IsolatedFlush(<span class="keywordtype">bool</span> hardFlush, <span class="keywordtype">bool</span> blocking);00072 00073 <span class="keyword">private</span>:00074 <span class="keyword">virtual</span> <span class="keywordtype">void</span> WritePrestreamHeader() {}00075 <span class="keyword">virtual</span> <span class="keywordtype">void</span> ProcessUncompressedData(<span class="keyword">const</span> byte *string, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length) {}00076 <span class="keyword">virtual</span> <span class="keywordtype">void</span> WritePoststreamTail() {}00077 00078 <span class="keyword">enum</span> {STORED = 0, STATIC = 1, DYNAMIC = 2};00079 <span class="keyword">enum</span> {MIN_MATCH = 3, MAX_MATCH = 258};00080 00081 <span class="keywordtype">void</span> InitializeStaticEncoders();00082 <span class="keywordtype">void</span> Reset(<span class="keywordtype">bool</span> forceReset = <span class="keyword">false</span>);00083 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> FillWindow(<span class="keyword">const</span> byte *str, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length);00084 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> ComputeHash(<span class="keyword">const</span> byte *str) <span class="keyword">const</span>;00085 <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>;00086 <span class="keywordtype">void</span> InsertString(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> start);00087 <span class="keywordtype">void</span> ProcessBuffer();00088 00089 <span class="keywordtype">void</span> LiteralByte(byte b);00090 <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);00091 <span class="keywordtype">void</span> EncodeBlock(<span class="keywordtype">bool</span> eof, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> blockType);00092 <span class="keywordtype">void</span> EndBlock(<span class="keywordtype">bool</span> eof);00093 00094 <span class="keyword">struct </span>EncodedMatch00095 {00096 <span class="keywordtype">unsigned</span> literalCode : 9;00097 <span class="keywordtype">unsigned</span> literalExtra : 5;00098 <span class="keywordtype">unsigned</span> distanceCode : 5;00099 <span class="keywordtype">unsigned</span> distanceExtra : 13;00100 };00101 00102 <span class="keywordtype">int</span> m_deflateLevel, m_log2WindowSize;00103 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> DSIZE, DMASK, HSIZE, HMASK, GOOD_MATCH, MAX_LAZYLENGTH, MAX_CHAIN_LENGTH;00104 <span class="keywordtype">bool</span> m_headerWritten, m_matchAvailable;00105 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> m_dictionaryEnd, m_stringStart, m_lookahead, m_minLookahead, m_previousMatch, m_previousLength;00106 <a class="code" href="class_huffman_encoder.html">HuffmanEncoder</a> m_staticLiteralEncoder, m_staticDistanceEncoder, m_dynamicLiteralEncoder, m_dynamicDistanceEncoder;00107 <a class="code" href="class_sec_block.html">SecByteBlock</a> m_byteBuffer;00108 <a class="code" href="class_sec_block.html">SecBlock<word16></a> m_head, m_prev;00109 FixedSizeSecBlock<unsigned int, 286> m_literalCounts;00110 FixedSizeSecBlock<unsigned int, 30> m_distanceCounts;00111 <a class="code" href="class_sec_block.html">SecBlock<EncodedMatch></a> m_matchBuffer;00112 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> m_matchBufferEnd, m_blockStart, m_blockLength;00113 };00114 00115 NAMESPACE_END00116 00117 <span class="preprocessor">#endif</span></pre></div><hr size="1"><address style="align: right;"><small>Generated on Tue Jul 8 23:34:28 2003 for Crypto++ by<a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border=0 > </a>1.3.2 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