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by weidai
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#ifndef CRYPTOPP_GZIP_H
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#define CRYPTOPP_GZIP_H
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#include "zdeflate.h" |
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#include "zinflate.h" |
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#include "crc.h" |
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NAMESPACE_BEGIN(CryptoPP) |
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/// 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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by weidai
add detection of uncompressibilty |
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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) {} |
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by weidai
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Gzip(const NameValuePairs ¶meters, BufferedTransformation *attachment=NULL) |
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: Deflator(parameters, attachment) {} |
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protected: |
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enum {MAGIC1=0x1f, MAGIC2=0x8b, // flags for the header |
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DEFLATED=8, FAST=4, SLOW=2}; |
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void WritePrestreamHeader(); |
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void ProcessUncompressedData(const byte *string, size_t length); |
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by weidai
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void WritePoststreamTail(); |
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word32 m_totalLen; |
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by weidai
Initial revision |
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CRC32 m_crc; |
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};
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/// GZIP Decompression (RFC 1952)
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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 : public Err {public: HeaderErr() : Err(INVALID_DATA_FORMAT, "Gunzip: header decoding error") {}}; |
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class TailErr : public Err {public: TailErr() : Err(INVALID_DATA_FORMAT, "Gunzip: tail too short") {}}; |
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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 : public Err {public: LengthErr() : Err(DATA_INTEGRITY_CHECK_FAILED, "Gunzip: length check error") {}}; |
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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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*/
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Gunzip(BufferedTransformation *attachment = NULL, bool repeat = false, int autoSignalPropagation = -1); |
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protected: |
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enum {MAGIC1=0x1f, MAGIC2=0x8b, // flags for the header |
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DEFLATED=8}; |
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enum FLAG_MASKS { |
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CONTINUED=2, EXTRA_FIELDS=4, FILENAME=8, COMMENTS=16, ENCRYPTED=32}; |
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unsigned int MaxPrestreamHeaderSize() const {return 1024;} |
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void ProcessPrestreamHeader(); |
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port to MSVC .NET 2005 beta 2 |
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void ProcessDecompressedData(const byte *string, size_t length); |
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by weidai
Initial revision |
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unsigned int MaxPoststreamTailSize() const {return 8;} |
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void ProcessPoststreamTail(); |
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word32 m_length; |
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CRC32 m_crc; |
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};
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NAMESPACE_END
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#endif
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