zlib.h
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// zlib.h - originally written and placed in the public domain by Wei Dai
/// \file zlib.h
/// \brief ZLIB compression and decompression (RFC 1950)
#ifndef CRYPTOPP_ZLIB_H
#define CRYPTOPP_ZLIB_H
#include "cryptlib.h"
#include "adler32.h"
#include "zdeflate.h"
#include "zinflate.h"
NAMESPACE_BEGIN(CryptoPP)
/// ZLIB Compressor (RFC 1950)
class ZlibCompressor : public Deflator
{
public:
ZlibCompressor(BufferedTransformation *attachment=NULLPTR, unsigned int deflateLevel=DEFAULT_DEFLATE_LEVEL, unsigned int log2WindowSize=DEFAULT_LOG2_WINDOW_SIZE, bool detectUncompressible=true)
: Deflator(attachment, deflateLevel, log2WindowSize, detectUncompressible) {}
ZlibCompressor(const NameValuePairs &parameters, BufferedTransformation *attachment=NULLPTR)
: Deflator(parameters, attachment) {}
unsigned int GetCompressionLevel() const;
protected:
void WritePrestreamHeader();
void ProcessUncompressedData(const byte *string, size_t length);
void WritePoststreamTail();
Adler32 m_adler32;
};
/// ZLIB Decompressor (RFC 1950)
class ZlibDecompressor : public Inflator
{
public:
typedef Inflator::Err Err;
class HeaderErr : public Err {public: HeaderErr() : Err(INVALID_DATA_FORMAT, "ZlibDecompressor: header decoding error") {}};
class Adler32Err : public Err {public: Adler32Err() : Err(DATA_INTEGRITY_CHECK_FAILED, "ZlibDecompressor: ADLER32 check error") {}};
class UnsupportedAlgorithm : public Err {public: UnsupportedAlgorithm() : Err(INVALID_DATA_FORMAT, "ZlibDecompressor: unsupported algorithm") {}};
class UnsupportedPresetDictionary : public Err {public: UnsupportedPresetDictionary() : Err(INVALID_DATA_FORMAT, "ZlibDecompressor: unsupported preset dictionary") {}};
/// \brief Construct a ZlibDecompressor
/// \param attachment a \ BufferedTransformation to attach to this object
/// \param repeat decompress multiple compressed streams in series
/// \param autoSignalPropagation 0 to turn off MessageEnd signal
ZlibDecompressor(BufferedTransformation *attachment = NULLPTR, bool repeat = false, int autoSignalPropagation = -1);
unsigned int GetLog2WindowSize() const {return m_log2WindowSize;}
private:
unsigned int MaxPrestreamHeaderSize() const {return 2;}
void ProcessPrestreamHeader();
void ProcessDecompressedData(const byte *string, size_t length);
unsigned int MaxPoststreamTailSize() const {return 4;}
void ProcessPoststreamTail();
unsigned int m_log2WindowSize;
Adler32 m_adler32;
};
NAMESPACE_END
#endif
adler32.h
Class file for ADLER-32 checksum calculations.
Adler32
ADLER-32 checksum calculations.
Definition: adler32.h:15
BufferedTransformation
Interface for buffered transformations.
Definition: cryptlib.h:1652
Deflator
DEFLATE compressor (RFC 1951)
Definition: zdeflate.h:76
Exception::INVALID_DATA_FORMAT
@ INVALID_DATA_FORMAT
Input data was received that did not conform to expected format.
Definition: cryptlib.h:173
Exception::DATA_INTEGRITY_CHECK_FAILED
@ DATA_INTEGRITY_CHECK_FAILED
Data integerity check, such as CRC or MAC, failed.
Definition: cryptlib.h:171
Inflator::Err
Definition: zinflate.h:98
Inflator
DEFLATE decompressor (RFC 1951)
Definition: zinflate.h:95
NameValuePairs
Interface for retrieving values given their names.
Definition: cryptlib.h:322
ZlibCompressor
ZLIB Compressor (RFC 1950)
Definition: zlib.h:18
ZlibDecompressor::Adler32Err
Definition: zlib.h:41
ZlibDecompressor::HeaderErr
Definition: zlib.h:40
ZlibDecompressor::UnsupportedAlgorithm
Definition: zlib.h:42
ZlibDecompressor::UnsupportedPresetDictionary
Definition: zlib.h:43
ZlibDecompressor
ZLIB Decompressor (RFC 1950)
Definition: zlib.h:37
ZlibDecompressor::ZlibDecompressor
ZlibDecompressor(BufferedTransformation *attachment=NULL, bool repeat=false, int autoSignalPropagation=-1)
Construct a ZlibDecompressor.
Definition: zlib.cpp:51
cryptlib.h
Abstract base classes that provide a uniform interface to this library.
CryptoPP
Crypto++ library namespace.
zdeflate.h
DEFLATE compression and decompression (RFC 1951)
zinflate.h
DEFLATE compression and decompression (RFC 1951)