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author | weidai <weidai11@users.noreply.github.com> | 2002-10-04 17:31:41 +0000 |
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committer | weidai <weidai11@users.noreply.github.com> | 2002-10-04 17:31:41 +0000 |
commit | a3b6ece7ab341b5b14135baeccea7d5e4c086771 (patch) | |
tree | 8b045309c238226c32a563b1df6b9c30a2f0e0b3 /zlib.h | |
download | cryptopp-git-a3b6ece7ab341b5b14135baeccea7d5e4c086771.tar.gz |
Initial revision
Diffstat (limited to 'zlib.h')
-rw-r--r-- | zlib.h | 58 |
1 files changed, 58 insertions, 0 deletions
@@ -0,0 +1,58 @@ +#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) + : Deflator(attachment, deflateLevel, log2WindowSize) {} + ZlibCompressor(const NameValuePairs ¶meters, BufferedTransformation *attachment=NULL) + : Deflator(parameters, attachment) {} + + unsigned int GetCompressionLevel() const; + +private: + void WritePrestreamHeader(); + void ProcessUncompressedData(const byte *string, unsigned int 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, unsigned int length); + unsigned int MaxPoststreamTailSize() const {return 4;} + void ProcessPoststreamTail(); + + unsigned int m_log2WindowSize; + Adler32 m_adler32; +}; + +NAMESPACE_END + +#endif |