• Main Page
  • Namespaces
  • Classes
  • Files
  • File List
  • File Members

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

Generated on Sun Oct 17 2010 02:13:04 for Crypto++ by  doxygen 1.7.1