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externals/cryptopp/zlib.h

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+// zlib.h - originally written and placed in the public domain by Wei Dai
+
+/// \file zlib.h
+/// \brief ZLIB compression and decompression (RFC 1950)
+
+#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=NULLPTR, 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=NULLPTR)
+		: 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 = NULLPTR, 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