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102 lines
3.6 KiB
C++
102 lines
3.6 KiB
C++
// gzip.h - originally 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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#include "cryptlib.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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//! \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=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), 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=NULLPTR)
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: Deflator(parameters, attachment), m_totalLen(0) {}
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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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void WritePoststreamTail();
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word32 m_totalLen;
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CRC32 m_crc;
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};
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//! \class Gunzip
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//! \brief 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
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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 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 = NULLPTR, bool repeat = false, int autoSignalPropagation = -1);
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protected:
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enum {
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//! \brief First header magic value
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MAGIC1=0x1f,
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//! \brief Second header magic value
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MAGIC2=0x8b,
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//! \brief Deflated flag
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DEFLATED=8
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};
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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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void ProcessDecompressedData(const byte *string, size_t length);
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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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