zlib.h

#ifndef CRYPTOPP_ZLIB_H
#define CRYPTOPP_ZLIB_H

#include "adler32.h"
#include "zdeflate.h"
#include "zinflate.h"

NAMESPACE_BEGIN(CryptoPP)

/// ZLIB Compressor (RFC 1950)
class ZlibCompressor : public Deflator
{
public:
        ZlibCompressor(BufferedTransformation *attachment=NULL, unsigned int deflateLevel=DEFAULT_DEFLATE_LEVEL, unsigned int log2WindowSize=DEFAULT_LOG2_WINDOW_SIZE, bool detectUncompressible=true)
                : Deflator(attachment, deflateLevel, log2WindowSize, detectUncompressible) {}
        ZlibCompressor(const NameValuePairs &parameters, BufferedTransformation *attachment=NULL)
                : Deflator(parameters, attachment) {}

        unsigned int GetCompressionLevel() const;

protected:
        void WritePrestreamHeader();
        void ProcessUncompressedData(const byte *string, size_t length);
        void WritePoststreamTail();

        Adler32 m_adler32;
};

/// ZLIB Decompressor (RFC 1950)
class ZlibDecompressor : public Inflator
{
public:
        typedef Inflator::Err Err;
        class HeaderErr : public Err {public: HeaderErr() : Err(INVALID_DATA_FORMAT, "ZlibDecompressor: header decoding error") {}};
        class Adler32Err : public Err {public: Adler32Err() : Err(DATA_INTEGRITY_CHECK_FAILED, "ZlibDecompressor: ADLER32 check error") {}};
        class UnsupportedAlgorithm : public Err {public: UnsupportedAlgorithm() : Err(INVALID_DATA_FORMAT, "ZlibDecompressor: unsupported algorithm") {}};
        class UnsupportedPresetDictionary : public Err {public: UnsupportedPresetDictionary() : Err(INVALID_DATA_FORMAT, "ZlibDecompressor: unsupported preset dictionary") {}};

        /*! \param repeat decompress multiple compressed streams in series
                \param autoSignalPropagation 0 to turn off MessageEnd signal
        */
        ZlibDecompressor(BufferedTransformation *attachment = NULL, bool repeat = false, int autoSignalPropagation = -1);
        unsigned int GetLog2WindowSize() const {return m_log2WindowSize;}

private:
        unsigned int MaxPrestreamHeaderSize() const {return 2;}
        void ProcessPrestreamHeader();
        void ProcessDecompressedData(const byte *string, size_t length);
        unsigned int MaxPoststreamTailSize() const {return 4;}
        void ProcessPoststreamTail();

        unsigned int m_log2WindowSize;
        Adler32 m_adler32;
};

NAMESPACE_END

#endif

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