00001 #ifndef CRYPTOPP_GZIP_H
00002 #define CRYPTOPP_GZIP_H
00003
00004 #include "zdeflate.h"
00005 #include "zinflate.h"
00006 #include "crc.h"
00007
00008 NAMESPACE_BEGIN(CryptoPP)
00009
00010
00011 class Gzip : public Deflator
00012 {
00013 public:
00014 Gzip(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 Gzip(const NameValuePairs ¶meters, BufferedTransformation *attachment=NULL)
00017 : Deflator(parameters, attachment) {}
00018
00019 protected:
00020 enum {MAGIC1=0x1f, MAGIC2=0x8b,
00021 DEFLATED=8, FAST=4, SLOW=2};
00022
00023 void WritePrestreamHeader();
00024 void ProcessUncompressedData(const byte *string, size_t length);
00025 void WritePoststreamTail();
00026
00027 word32 m_totalLen;
00028 CRC32 m_crc;
00029 };
00030
00031
00032 class Gunzip : public Inflator
00033 {
00034 public:
00035 typedef Inflator::Err Err;
00036 class HeaderErr : public Err {public: HeaderErr() : Err(INVALID_DATA_FORMAT, "Gunzip: header decoding error") {}};
00037 class TailErr : public Err {public: TailErr() : Err(INVALID_DATA_FORMAT, "Gunzip: tail too short") {}};
00038 class CrcErr : public Err {public: CrcErr() : Err(DATA_INTEGRITY_CHECK_FAILED, "Gunzip: CRC check error") {}};
00039 class LengthErr : public Err {public: LengthErr() : Err(DATA_INTEGRITY_CHECK_FAILED, "Gunzip: length check error") {}};
00040
00041
00042
00043
00044 Gunzip(BufferedTransformation *attachment = NULL, bool repeat = false, int autoSignalPropagation = -1);
00045
00046 protected:
00047 enum {MAGIC1=0x1f, MAGIC2=0x8b,
00048 DEFLATED=8};
00049
00050 enum FLAG_MASKS {
00051 CONTINUED=2, EXTRA_FIELDS=4, FILENAME=8, COMMENTS=16, ENCRYPTED=32};
00052
00053 unsigned int MaxPrestreamHeaderSize() const {return 1024;}
00054 void ProcessPrestreamHeader();
00055 void ProcessDecompressedData(const byte *string, size_t length);
00056 unsigned int MaxPoststreamTailSize() const {return 8;}
00057 void ProcessPoststreamTail();
00058
00059 word32 m_length;
00060 CRC32 m_crc;
00061 };
00062
00063 NAMESPACE_END
00064
00065 #endif