Crypto++
8.6
Free C++ class library of cryptographic schemes
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Go to the documentation of this file.
6 #ifndef CRYPTOPP_ZDEFLATE_H
7 #define CRYPTOPP_ZDEFLATE_H
24 void PutBits(
unsigned long value,
unsigned int length);
25 void FlushBitBuffer();
26 void ClearBitBuffer();
29 unsigned long FinishCounting();
33 unsigned long m_bitCount;
34 unsigned long m_buffer;
35 unsigned int m_bitsBuffered, m_bytesBuffered;
44 typedef unsigned int code_t;
45 typedef unsigned int value_t;
58 void Initialize(
const unsigned int *codeBits,
unsigned int nCodes);
60 static void GenerateCodeLengths(
unsigned int *codeBits,
unsigned int maxCodeBits,
const unsigned int *codeCounts,
size_t nCodes);
125 size_t Put2(
const byte *inString,
size_t length,
int messageEnd,
bool blocking);
129 virtual void WritePrestreamHeader() {}
130 virtual void ProcessUncompressedData(
const byte *
string,
size_t length)
131 {CRYPTOPP_UNUSED(
string), CRYPTOPP_UNUSED(length);}
132 virtual void WritePoststreamTail() {}
134 enum {STORED = 0, STATIC = 1, DYNAMIC = 2};
135 enum {MIN_MATCH = 3, MAX_MATCH = 258};
137 void InitializeStaticEncoders();
138 void Reset(
bool forceReset =
false);
139 unsigned int FillWindow(
const byte *str,
size_t length);
140 unsigned int ComputeHash(
const byte *str)
const;
141 unsigned int LongestMatch(
unsigned int &bestMatch)
const;
142 void InsertString(
unsigned int start);
143 void ProcessBuffer();
145 void LiteralByte(
byte b);
146 void MatchFound(
unsigned int distance,
unsigned int length);
147 void EncodeBlock(
bool eof,
unsigned int blockType);
148 void EndBlock(
bool eof);
152 unsigned literalCode : 9;
153 unsigned literalExtra : 5;
154 unsigned distanceCode : 5;
155 unsigned distanceExtra : 13;
158 int m_deflateLevel, m_log2WindowSize, m_compressibleDeflateLevel;
159 unsigned int m_detectSkip, m_detectCount;
160 unsigned int DSIZE, DMASK, HSIZE, HMASK, GOOD_MATCH, MAX_LAZYLENGTH, MAX_CHAIN_LENGTH;
161 bool m_headerWritten, m_matchAvailable;
162 unsigned int m_dictionaryEnd, m_stringStart, m_lookahead, m_minLookahead, m_previousMatch, m_previousLength;
163 HuffmanEncoder m_staticLiteralEncoder, m_staticDistanceEncoder, m_dynamicLiteralEncoder, m_dynamicDistanceEncoder;
169 unsigned int m_matchBufferEnd, m_blockStart, m_blockLength;
HuffmanEncoder()
Construct a HuffmanEncoder.
DEFLATE compressor (RFC 1951)
void Initialize(const unsigned int *codeBits, unsigned int nCodes)
Initialize or reinitialize this object.
@ MIN_LOG2_WINDOW_SIZE
Minimum window size, smallest table (9)
Implementation of BufferedTransformation's attachment interface.
Utility functions for the Crypto++ library.
@ DEFAULT_LOG2_WINDOW_SIZE
Default window size (15)
Implementation of BufferedTransformation's attachment interface.
@ DEFAULT_DEFLATE_LEVEL
Default deflation level, compromise between speed (6)
@ MAX_DEFLATE_LEVEL
Minimum deflation level, slowest speed (9)
void IsolatedInitialize(const NameValuePairs ¶meters)
Initialize or reinitialize this object, without signal propagation.
int GetDeflateLevel() const
Retrieves the deflation level.
void SetDeflateLevel(int deflateLevel)
Sets the deflation level.
int GetLog2WindowSize() const
Retrieves the window size.
@ MIN_DEFLATE_LEVEL
Minimum deflation level, fastest speed (0)
Crypto++ library namespace.
Secure memory block with allocator and cleanup.
Deflator(BufferedTransformation *attachment=NULL, int deflateLevel=DEFAULT_DEFLATE_LEVEL, int log2WindowSize=DEFAULT_LOG2_WINDOW_SIZE, bool detectUncompressible=true)
Construct a Deflator compressor.
size_t Put2(const byte *inString, size_t length, int messageEnd, bool blocking)
Input multiple bytes for processing.
Interface for retrieving values given their names.
Abstract base classes that provide a uniform interface to this library.
bool IsolatedFlush(bool hardFlush, bool blocking)
Flushes data buffered by this object, without signal propagation.
@ MAX_LOG2_WINDOW_SIZE
Maximum window size, largest table (15)