1 #ifndef CRYPTOPP_ZLIB_H
2 #define CRYPTOPP_ZLIB_H
3
4 #include "cryptlib.h"
5 #include "adler32.h"
6 #include "zdeflate.h"
7 #include "zinflate.h"
8
NAMESPACE_BEGIN(CryptoPP)9 NAMESPACE_BEGIN(CryptoPP)
10
11 /// ZLIB Compressor (RFC 1950)
12 class ZlibCompressor : public Deflator
13 {
14 public:
15 ZlibCompressor(BufferedTransformation *attachment=NULL, unsigned int deflateLevel=DEFAULT_DEFLATE_LEVEL, unsigned int log2WindowSize=DEFAULT_LOG2_WINDOW_SIZE, bool detectUncompressible=true)
16 : Deflator(attachment, deflateLevel, log2WindowSize, detectUncompressible) {}
17 ZlibCompressor(const NameValuePairs ¶meters, BufferedTransformation *attachment=NULL)
18 : Deflator(parameters, attachment) {}
19
20 unsigned int GetCompressionLevel() const;
21
22 protected:
23 void WritePrestreamHeader();
24 void ProcessUncompressedData(const byte *string, size_t length);
25 void WritePoststreamTail();
26
27 Adler32 m_adler32;
28 };
29
30 /// ZLIB Decompressor (RFC 1950)
31 class ZlibDecompressor : public Inflator
32 {
33 public:
34 typedef Inflator::Err Err;
HeaderErr()35 class HeaderErr : public Err {public: HeaderErr() : Err(INVALID_DATA_FORMAT, "ZlibDecompressor: header decoding error") {}};
Adler32Err()36 class Adler32Err : public Err {public: Adler32Err() : Err(DATA_INTEGRITY_CHECK_FAILED, "ZlibDecompressor: ADLER32 check error") {}};
UnsupportedAlgorithm()37 class UnsupportedAlgorithm : public Err {public: UnsupportedAlgorithm() : Err(INVALID_DATA_FORMAT, "ZlibDecompressor: unsupported algorithm") {}};
UnsupportedPresetDictionary()38 class UnsupportedPresetDictionary : public Err {public: UnsupportedPresetDictionary() : Err(INVALID_DATA_FORMAT, "ZlibDecompressor: unsupported preset dictionary") {}};
39
40 //! \brief Construct a ZlibDecompressor
41 //! \param attachment a \ BufferedTransformation to attach to this object
42 //! \param repeat decompress multiple compressed streams in series
43 //! \param autoSignalPropagation 0 to turn off MessageEnd signal
44 ZlibDecompressor(BufferedTransformation *attachment = NULL, bool repeat = false, int autoSignalPropagation = -1);
GetLog2WindowSize()45 unsigned int GetLog2WindowSize() const {return m_log2WindowSize;}
46
47 private:
MaxPrestreamHeaderSize()48 unsigned int MaxPrestreamHeaderSize() const {return 2;}
49 void ProcessPrestreamHeader();
50 void ProcessDecompressedData(const byte *string, size_t length);
MaxPoststreamTailSize()51 unsigned int MaxPoststreamTailSize() const {return 4;}
52 void ProcessPoststreamTail();
53
54 unsigned int m_log2WindowSize;
55 Adler32 m_adler32;
56 };
57
58 NAMESPACE_END
59
60 #endif
61