Crypto++
5.6.5
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
23 void PutBits(
unsigned long value,
unsigned int length);
24 void FlushBitBuffer();
25 void ClearBitBuffer();
28 unsigned long FinishCounting();
32 unsigned long m_bitCount;
33 unsigned long m_buffer;
34 unsigned int m_bitsBuffered, m_bytesBuffered;
42 typedef unsigned int code_t;
43 typedef unsigned int value_t;
56 void Initialize(
const unsigned int *codeBits,
unsigned int nCodes);
58 static void GenerateCodeLengths(
unsigned int *codeBits,
unsigned int maxCodeBits,
const unsigned int *codeCounts,
size_t nCodes);
123 size_t Put2(
const byte *inString,
size_t length,
int messageEnd,
bool blocking);
127 virtual void WritePrestreamHeader() {}
128 virtual void ProcessUncompressedData(
const byte *
string,
size_t length)
129 {CRYPTOPP_UNUSED(
string), CRYPTOPP_UNUSED(length);}
130 virtual void WritePoststreamTail() {}
132 enum {STORED = 0, STATIC = 1, DYNAMIC = 2};
133 enum {MIN_MATCH = 3, MAX_MATCH = 258};
135 void InitializeStaticEncoders();
136 void Reset(
bool forceReset =
false);
137 unsigned int FillWindow(
const byte *str,
size_t length);
138 unsigned int ComputeHash(
const byte *str)
const;
139 unsigned int LongestMatch(
unsigned int &bestMatch)
const;
140 void InsertString(
unsigned int start);
141 void ProcessBuffer();
143 void LiteralByte(
byte b);
144 void MatchFound(
unsigned int distance,
unsigned int length);
145 void EncodeBlock(
bool eof,
unsigned int blockType);
146 void EndBlock(
bool eof);
150 unsigned literalCode : 9;
151 unsigned literalExtra : 5;
152 unsigned distanceCode : 5;
153 unsigned distanceExtra : 13;
156 int m_deflateLevel, m_log2WindowSize, m_compressibleDeflateLevel;
157 unsigned int m_detectSkip, m_detectCount;
158 unsigned int DSIZE, DMASK, HSIZE, HMASK, GOOD_MATCH, MAX_LAZYLENGTH, MAX_CHAIN_LENGTH;
159 bool m_headerWritten, m_matchAvailable;
160 unsigned int m_dictionaryEnd, m_stringStart, m_lookahead, m_minLookahead, m_previousMatch, m_previousLength;
161 HuffmanEncoder m_staticLiteralEncoder, m_staticDistanceEncoder, m_dynamicLiteralEncoder, m_dynamicDistanceEncoder;
167 unsigned int m_matchBufferEnd, m_blockStart, m_blockLength;
@ MIN_DEFLATE_LEVEL
Minimum deflation level, fastest speed (0)
@ DEFAULT_DEFLATE_LEVEL
Default deflation level, compromise between speed (6)
HuffmanEncoder()
Construct a HuffmanEncoder.
DEFLATE compressor (RFC 1951)
@ MIN_LOG2_WINDOW_SIZE
Minimum window size, smallest table (9)
void Initialize(const unsigned int *codeBits, unsigned int nCodes)
Initialize or reinitialize this object.
Implementation of BufferedTransformation's attachment interface.
@ DEFAULT_LOG2_WINDOW_SIZE
Default window size (15)
Utility functions for the Crypto++ library.
Implementation of BufferedTransformation's attachment interface.
@ MAX_LOG2_WINDOW_SIZE
Maximum window size, largest table (15)
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.
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.
@ MAX_DEFLATE_LEVEL
Minimum deflation level, slowest speed (9)
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.