Crypto++ 8.2 Free C++ class library of cryptographic schemes

zlib.h
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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
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 &parameters, 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;
40 class HeaderErr : public Err {public: HeaderErr() : Err(INVALID_DATA_FORMAT, "ZlibDecompressor: header decoding error") {}};
41 class Adler32Err : public Err {public: Adler32Err() : Err(DATA_INTEGRITY_CHECK_FAILED, "ZlibDecompressor: ADLER32 check error") {}};
42 class UnsupportedAlgorithm : public Err {public: UnsupportedAlgorithm() : Err(INVALID_DATA_FORMAT, "ZlibDecompressor: unsupported algorithm") {}};
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);
50 unsigned int GetLog2WindowSize() const {return m_log2WindowSize;}
51
52 private:
53 unsigned int MaxPrestreamHeaderSize() const {return 2;}
54 void ProcessPrestreamHeader();
55 void ProcessDecompressedData(const byte *string, size_t length);
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
ZlibDecompressor::ZlibDecompressor
ZlibDecompressor(BufferedTransformation *attachment=NULL, bool repeat=false, int autoSignalPropagation=-1)
Construct a ZlibDecompressor.
Definition: zlib.cpp:51
ZlibDecompressor::Adler32Err
Definition: zlib.h:41
cryptlib.h
Abstract base classes that provide a uniform interface to this library.
Deflator
DEFLATE compressor (RFC 1951)
Definition: zdeflate.h:75
ZlibDecompressor::UnsupportedAlgorithm
Definition: zlib.h:42
Inflator::Err
Definition: zinflate.h:97
BufferedTransformation
Interface for buffered transformations.
Definition: cryptlib.h:1630
zdeflate.h
DEFLATE compression and decompression (RFC 1951)
Exception::DATA_INTEGRITY_CHECK_FAILED
Data integerity check, such as CRC or MAC, failed.
Definition: cryptlib.h:171
Adler32
ADLER-32 checksum calculations.
Definition: adler32.h:14
Exception::INVALID_DATA_FORMAT
Input data was received that did not conform to expected format.
Definition: cryptlib.h:173
ZlibCompressor
ZLIB Compressor (RFC 1950)
Definition: zlib.h:17
ZlibDecompressor::HeaderErr
Definition: zlib.h:40
ZlibDecompressor
ZLIB Decompressor (RFC 1950)
Definition: zlib.h:36
adler32.h
Class file for ADLER-32 checksum calculations.
zinflate.h
DEFLATE compression and decompression (RFC 1951)
Inflator
DEFLATE decompressor (RFC 1951)
Definition: zinflate.h:94
ZlibDecompressor::UnsupportedPresetDictionary
Definition: zlib.h:43
CryptoPP
Crypto++ library namespace.
NameValuePairs
Interface for retrieving values given their names.
Definition: cryptlib.h:321