66 lines
2.5 KiB
C++
66 lines
2.5 KiB
C++
// zlib.h - originally written and placed in the public domain by Wei Dai
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/// \file zlib.h
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/// \brief ZLIB compression and decompression (RFC 1950)
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#ifndef CRYPTOPP_ZLIB_H
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#define CRYPTOPP_ZLIB_H
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#include "cryptlib.h"
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#include "adler32.h"
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#include "zdeflate.h"
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#include "zinflate.h"
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NAMESPACE_BEGIN(CryptoPP)
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/// ZLIB Compressor (RFC 1950)
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class ZlibCompressor : public Deflator
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{
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public:
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ZlibCompressor(BufferedTransformation *attachment=NULLPTR, unsigned int deflateLevel=DEFAULT_DEFLATE_LEVEL, unsigned int log2WindowSize=DEFAULT_LOG2_WINDOW_SIZE, bool detectUncompressible=true)
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: Deflator(attachment, deflateLevel, log2WindowSize, detectUncompressible) {}
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ZlibCompressor(const NameValuePairs ¶meters, BufferedTransformation *attachment=NULLPTR)
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: Deflator(parameters, attachment) {}
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unsigned int GetCompressionLevel() const;
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protected:
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void WritePrestreamHeader();
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void ProcessUncompressedData(const byte *string, size_t length);
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void WritePoststreamTail();
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Adler32 m_adler32;
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};
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/// ZLIB Decompressor (RFC 1950)
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class ZlibDecompressor : public Inflator
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{
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public:
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typedef Inflator::Err Err;
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class HeaderErr : public Err {public: HeaderErr() : Err(INVALID_DATA_FORMAT, "ZlibDecompressor: header decoding error") {}};
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class Adler32Err : public Err {public: Adler32Err() : Err(DATA_INTEGRITY_CHECK_FAILED, "ZlibDecompressor: ADLER32 check error") {}};
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class UnsupportedAlgorithm : public Err {public: UnsupportedAlgorithm() : Err(INVALID_DATA_FORMAT, "ZlibDecompressor: unsupported algorithm") {}};
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class UnsupportedPresetDictionary : public Err {public: UnsupportedPresetDictionary() : Err(INVALID_DATA_FORMAT, "ZlibDecompressor: unsupported preset dictionary") {}};
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/// \brief Construct a ZlibDecompressor
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/// \param attachment a \ BufferedTransformation to attach to this object
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/// \param repeat decompress multiple compressed streams in series
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/// \param autoSignalPropagation 0 to turn off MessageEnd signal
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ZlibDecompressor(BufferedTransformation *attachment = NULLPTR, bool repeat = false, int autoSignalPropagation = -1);
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unsigned int GetLog2WindowSize() const {return m_log2WindowSize;}
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private:
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unsigned int MaxPrestreamHeaderSize() const {return 2;}
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void ProcessPrestreamHeader();
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void ProcessDecompressedData(const byte *string, size_t length);
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unsigned int MaxPoststreamTailSize() const {return 4;}
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void ProcessPoststreamTail();
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unsigned int m_log2WindowSize;
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Adler32 m_adler32;
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};
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NAMESPACE_END
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#endif
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