Updated documentation
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gzip.h
33
gzip.h
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// gzip.h - written and placed in the public domain by Wei Dai
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//! \file gzip.h
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//! \brief GZIP compression and decompression (RFC 1952)
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#ifndef CRYPTOPP_GZIP_H
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#define CRYPTOPP_GZIP_H
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NAMESPACE_BEGIN(CryptoPP)
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/// GZIP Compression (RFC 1952)
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//! \class Gzip
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//! \brief GZIP Compression (RFC 1952)
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class Gzip : public Deflator
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{
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public:
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//! \brief Construct a Gzip compressor
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//! \param attachment an attached transformation
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//! \param deflateLevel the deflate level
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//! \param log2WindowSize the window size
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//! \param detectUncompressible flag to detect if data is compressible
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//! \details detectUncompressible makes it faster to process uncompressible files, but
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//! if a file has both compressible and uncompressible parts, it may fail to compress
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//! some of the compressible parts.
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Gzip(BufferedTransformation *attachment=NULL, 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), m_totalLen(0) {}
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//! \brief Construct a Gzip compressor
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//! \param parameters a set of NameValuePairs to initialize this object
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//! \param attachment an attached transformation
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//! \details Possible parameter names: Log2WindowSize, DeflateLevel, DetectUncompressible
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Gzip(const NameValuePairs ¶meters, BufferedTransformation *attachment=NULL)
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: Deflator(parameters, attachment), m_totalLen(0) {}
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@ -35,13 +53,22 @@ class Gunzip : 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
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//! \brief Exception thrown when a header decoding error occurs
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class HeaderErr : public Err {public: HeaderErr() : Err(INVALID_DATA_FORMAT, "Gunzip: header decoding error") {}};
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//! \class TailErr
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//! \brief Exception thrown when the tail is too short
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class TailErr : public Err {public: TailErr() : Err(INVALID_DATA_FORMAT, "Gunzip: tail too short") {}};
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//! \class CrcErr
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//! \brief Exception thrown when a CRC error occurs
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class CrcErr : public Err {public: CrcErr() : Err(DATA_INTEGRITY_CHECK_FAILED, "Gunzip: CRC check error") {}};
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//! \class LengthErr
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//! \brief Exception thrown when a length error occurs
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class LengthErr : public Err {public: LengthErr() : Err(DATA_INTEGRITY_CHECK_FAILED, "Gunzip: length check error") {}};
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//! \brief Construct a Gunzip
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//! \param attachment a \ BufferedTransformation to attach to this object
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//! \brief Construct a Gunzip decompressor
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//! \param attachment an attached transformation
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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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Gunzip(BufferedTransformation *attachment = NULL, bool repeat = false, int autoSignalPropagation = -1);
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60
zdeflate.h
60
zdeflate.h
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@ -1,3 +1,8 @@
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// zdeflate.h - written and placed in the public domain by Wei Dai
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//! \file zdeflate.h
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//! \brief DEFLATE compression and decompression (RFC 1951)
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#ifndef CRYPTOPP_ZDEFLATE_H
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#define CRYPTOPP_ZDEFLATE_H
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NAMESPACE_BEGIN(CryptoPP)
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//! _
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//! \brief Encoding table writer
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class LowFirstBitWriter : public Filter
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{
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public:
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//! \brief Construct a LowFirstBitWriter
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//! \param attachment an attached transformation
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LowFirstBitWriter(BufferedTransformation *attachment);
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void PutBits(unsigned long value, unsigned int length);
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void FlushBitBuffer();
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void ClearBitBuffer();
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SecBlock<Code> m_valueToCode;
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};
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//! DEFLATE (RFC 1951) compressor
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//! \class Deflator
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//! \brief DEFLATE compressor (RFC 1951)
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class Deflator : public LowFirstBitWriter
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{
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public:
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enum {MIN_DEFLATE_LEVEL = 0, DEFAULT_DEFLATE_LEVEL = 6, MAX_DEFLATE_LEVEL = 9};
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enum {MIN_LOG2_WINDOW_SIZE = 9, DEFAULT_LOG2_WINDOW_SIZE = 15, MAX_LOG2_WINDOW_SIZE = 15};
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/*! \note detectUncompressible makes it faster to process uncompressible files, but
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if a file has both compressible and uncompressible parts, it may fail to compress some of the
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compressible parts. */
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//! \brief Deflate level as enumerated values.
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enum {
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//! \brief Minimum deflation level, fastest speed (0)
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MIN_DEFLATE_LEVEL = 0,
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//! \brief Default deflation level, compromise between speed (6)
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DEFAULT_DEFLATE_LEVEL = 6,
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//! \brief Minimum deflation level, slowest speed (9)
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MAX_DEFLATE_LEVEL = 9};
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//! \brief Windows size as enumerated values.
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enum {
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//! \brief Minimum window size, smallest table (9)
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MIN_LOG2_WINDOW_SIZE = 9,
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//! \brief Default window size (15)
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DEFAULT_LOG2_WINDOW_SIZE = 15,
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//! \brief Maximum window size, largest table (15)
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MAX_LOG2_WINDOW_SIZE = 15};
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//! \brief Construct a Deflator compressor
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//! \param attachment an attached transformation
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//! \param deflateLevel the deflate level
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//! \param log2WindowSize the window size
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//! \param detectUncompressible flag to detect if data is compressible
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//! \details detectUncompressible makes it faster to process uncompressible files, but
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//! if a file has both compressible and uncompressible parts, it may fail to compress
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//! some of the compressible parts.
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Deflator(BufferedTransformation *attachment=NULL, int deflateLevel=DEFAULT_DEFLATE_LEVEL, int log2WindowSize=DEFAULT_LOG2_WINDOW_SIZE, bool detectUncompressible=true);
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//! possible parameter names: Log2WindowSize, DeflateLevel, DetectUncompressible
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//! \brief Construct a Deflator compressor
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//! \param parameters a set of NameValuePairs to initialize this object
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//! \param attachment an attached transformation
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//! \details Possible parameter names: Log2WindowSize, DeflateLevel, DetectUncompressible
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Deflator(const NameValuePairs ¶meters, BufferedTransformation *attachment=NULL);
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//! this function can be used to set the deflate level in the middle of compression
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//! \brief Sets the deflation level
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//! \param deflateLevel the level of deflation
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//! \details SetDeflateLevel can be used to set the deflate level in the middle of compression
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void SetDeflateLevel(int deflateLevel);
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//! \brief Retrieves the deflation level
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//! \returns the level of deflation
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int GetDeflateLevel() const {return m_deflateLevel;}
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//! \brief Retrieves the window size
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//! \returns the windows size
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int GetLog2WindowSize() const {return m_log2WindowSize;}
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void IsolatedInitialize(const NameValuePairs ¶meters);
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