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zlib.h

    00001 #ifndef CRYPTOPP_ZLIB_H
    00002 #define CRYPTOPP_ZLIB_H
    00003
    00004 #include "adler32.h"
    00005 #include "zdeflate.h"
    00006 #include "zinflate.h"
    00007
    00008 NAMESPACE_BEGIN(CryptoPP)
    00009
    00010 /// ZLIB Compressor (RFC 1950)
    00011 class ZlibCompressor : public Deflator
    00012 {
    00013 public:
    00014     ZlibCompressor(BufferedTransformation *attachment=NULL, unsigned int deflateLevel=DEFAULT_DEFLATE_LEVEL, unsigned int log2WindowSize=DEFAULT_LOG2_WINDOW_SIZE, bool detectUncompressible=true)
    00015         : Deflator(attachment, deflateLevel, log2WindowSize, detectUncompressible) {}
    00016     ZlibCompressor(const NameValuePairs &parameters, BufferedTransformation *attachment=NULL)
    00017         : Deflator(parameters, attachment) {}
    00018
    00019     unsigned int GetCompressionLevel() const;
    00020
    00021 protected:
    00022     void WritePrestreamHeader();
    00023     void ProcessUncompressedData(const byte *string, size_t length);
    00024     void WritePoststreamTail();
    00025
    00026     Adler32 m_adler32;
    00027 };
    00028
    00029 /// ZLIB Decompressor (RFC 1950)
    00030 class ZlibDecompressor : public Inflator
    00031 {
    00032 public:
    00033     typedef Inflator::Err Err;
    00034     class HeaderErr : public Err {public: HeaderErr() : Err(INVALID_DATA_FORMAT, "ZlibDecompressor: header decoding error") {}};
    00035     class Adler32Err : public Err {public: Adler32Err() : Err(DATA_INTEGRITY_CHECK_FAILED, "ZlibDecompressor: ADLER32 check error") {}};
    00036     class UnsupportedAlgorithm : public Err {public: UnsupportedAlgorithm() : Err(INVALID_DATA_FORMAT, "ZlibDecompressor: unsupported algorithm") {}};
    00037     class UnsupportedPresetDictionary : public Err {public: UnsupportedPresetDictionary() : Err(INVALID_DATA_FORMAT, "ZlibDecompressor: unsupported preset dictionary") {}};
    00038
    00039     /*! \param repeat decompress multiple compressed streams in series
    00040         \param autoSignalPropagation 0 to turn off MessageEnd signal
    00041     */
    00042     ZlibDecompressor(BufferedTransformation *attachment = NULL, bool repeat = false, int autoSignalPropagation = -1);
    00043     unsigned int GetLog2WindowSize() const {return m_log2WindowSize;}
    00044
    00045 private:
    00046     unsigned int MaxPrestreamHeaderSize() const {return 2;}
    00047     void ProcessPrestreamHeader();
    00048     void ProcessDecompressedData(const byte *string, size_t length);
    00049     unsigned int MaxPoststreamTailSize() const {return 4;}
    00050     void ProcessPoststreamTail();
    00051
    00052     unsigned int m_log2WindowSize;
    00053     Adler32 m_adler32;
    00054 };
    00055
    00056 NAMESPACE_END
    00057
    00058 #endif