1 // zlib.h - originally written and placed in the public domain by Wei Dai
2
3 /// \file zlib.h
4 /// \brief ZLIB compression and decompression (RFC 1950)
5
6 #ifndef CRYPTOPP_ZLIB_H
7 #define CRYPTOPP_ZLIB_H
8
9 #include "cryptlib.h"
10 #include "adler32.h"
11 #include "zdeflate.h"
12 #include "zinflate.h"
13
NAMESPACE_BEGIN(CryptoPP)14 NAMESPACE_BEGIN(CryptoPP)
15
16 /// ZLIB Compressor (RFC 1950)
17 class ZlibCompressor : public Deflator
18 {
19 public:
20 ZlibCompressor(BufferedTransformation *attachment=NULLPTR, unsigned int deflateLevel=DEFAULT_DEFLATE_LEVEL, unsigned int log2WindowSize=DEFAULT_LOG2_WINDOW_SIZE, bool detectUncompressible=true)
21 : Deflator(attachment, deflateLevel, log2WindowSize, detectUncompressible) {}
22 ZlibCompressor(const NameValuePairs ¶meters, BufferedTransformation *attachment=NULLPTR)
23 : Deflator(parameters, attachment) {}
24
25 unsigned int GetCompressionLevel() const;
26
27 protected:
28 void WritePrestreamHeader();
29 void ProcessUncompressedData(const byte *string, size_t length);
30 void WritePoststreamTail();
31
32 Adler32 m_adler32;
33 };
34
35 /// ZLIB Decompressor (RFC 1950)
36 class ZlibDecompressor : public Inflator
37 {
38 public:
39 typedef Inflator::Err Err;
HeaderErr()40 class HeaderErr : public Err {public: HeaderErr() : Err(INVALID_DATA_FORMAT, "ZlibDecompressor: header decoding error") {}};
Adler32Err()41 class Adler32Err : public Err {public: Adler32Err() : Err(DATA_INTEGRITY_CHECK_FAILED, "ZlibDecompressor: ADLER32 check error") {}};
UnsupportedAlgorithm()42 class UnsupportedAlgorithm : public Err {public: UnsupportedAlgorithm() : Err(INVALID_DATA_FORMAT, "ZlibDecompressor: unsupported algorithm") {}};
UnsupportedPresetDictionary()43 class UnsupportedPresetDictionary : public Err {public: UnsupportedPresetDictionary() : Err(INVALID_DATA_FORMAT, "ZlibDecompressor: unsupported preset dictionary") {}};
44
45 /// \brief Construct a ZlibDecompressor
46 /// \param attachment a \ BufferedTransformation to attach to this object
47 /// \param repeat decompress multiple compressed streams in series
48 /// \param autoSignalPropagation 0 to turn off MessageEnd signal
49 ZlibDecompressor(BufferedTransformation *attachment = NULLPTR, bool repeat = false, int autoSignalPropagation = -1);
GetLog2WindowSize()50 unsigned int GetLog2WindowSize() const {return m_log2WindowSize;}
51
52 private:
MaxPrestreamHeaderSize()53 unsigned int MaxPrestreamHeaderSize() const {return 2;}
54 void ProcessPrestreamHeader();
55 void ProcessDecompressedData(const byte *string, size_t length);
MaxPoststreamTailSize()56 unsigned int MaxPoststreamTailSize() const {return 4;}
57 void ProcessPoststreamTail();
58
59 unsigned int m_log2WindowSize;
60 Adler32 m_adler32;
61 };
62
63 NAMESPACE_END
64
65 #endif
66