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#ifndef CRYPTOPP_ZLIB_H
#define CRYPTOPP_ZLIB_H
#include "cryptlib.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 ¶meters, 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") {}};
//! \brief Construct a ZlibDecompressor
//! \param attachment a \ BufferedTransformation to attach to this object
//! \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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