gzip.h
#ifndef CRYPTOPP_GZIP_H
#define CRYPTOPP_GZIP_H
#include "zdeflate.h"
#include "zinflate.h"
#include "crc.h"
NAMESPACE_BEGIN(CryptoPP)
/// GZIP Compression (RFC 1952)
class Gzip : public Deflator
{
public:
Gzip(BufferedTransformation *attachment=NULL, unsigned int deflateLevel=DEFAULT_DEFLATE_LEVEL, unsigned int log2WindowSize=DEFAULT_LOG2_WINDOW_SIZE, bool detectUncompressible=true)
: Deflator(attachment, deflateLevel, log2WindowSize, detectUncompressible) {}
Gzip(const NameValuePairs &parameters, BufferedTransformation *attachment=NULL)
: Deflator(parameters, attachment) {}
protected:
enum {MAGIC1=0x1f, MAGIC2=0x8b, // flags for the header
DEFLATED=8, FAST=4, SLOW=2};
void WritePrestreamHeader();
void ProcessUncompressedData(const byte *string, size_t length);
void WritePoststreamTail();
word32 m_totalLen;
CRC32 m_crc;
};
/// GZIP Decompression (RFC 1952)
class Gunzip : public Inflator
{
public:
typedef Inflator::Err Err;
class HeaderErr : public Err {public: HeaderErr() : Err(INVALID_DATA_FORMAT, "Gunzip: header decoding error") {}};
class TailErr : public Err {public: TailErr() : Err(INVALID_DATA_FORMAT, "Gunzip: tail too short") {}};
class CrcErr : public Err {public: CrcErr() : Err(DATA_INTEGRITY_CHECK_FAILED, "Gunzip: CRC check error") {}};
class LengthErr : public Err {public: LengthErr() : Err(DATA_INTEGRITY_CHECK_FAILED, "Gunzip: length check error") {}};
/*! \param repeat decompress multiple compressed streams in series
\param autoSignalPropagation 0 to turn off MessageEnd signal
*/
Gunzip(BufferedTransformation *attachment = NULL, bool repeat = false, int autoSignalPropagation = -1);
protected:
enum {MAGIC1=0x1f, MAGIC2=0x8b, // flags for the header
DEFLATED=8};
enum FLAG_MASKS {
CONTINUED=2, EXTRA_FIELDS=4, FILENAME=8, COMMENTS=16, ENCRYPTED=32};
unsigned int MaxPrestreamHeaderSize() const {return 1024;}
void ProcessPrestreamHeader();
void ProcessDecompressedData(const byte *string, size_t length);
unsigned int MaxPoststreamTailSize() const {return 8;}
void ProcessPoststreamTail();
word32 m_length;
CRC32 m_crc;
};
NAMESPACE_END
#endif
Gunzip
GZIP Decompression (RFC 1952)
Definition: gzip.h:32
Gunzip::CrcErr
Definition: gzip.h:38
Deflator
DEFLATE (RFC 1951) compressor.
Definition: zdeflate.h:55
Gunzip::LengthErr
Definition: gzip.h:39
Inflator::Err
Definition: zinflate.h:88
BufferedTransformation
interface for buffered transformations
Definition: cryptlib.h:770
Exception::DATA_INTEGRITY_CHECK_FAILED
data integerity check (such as CRC or MAC) failed
Definition: cryptlib.h:121
Gunzip::Gunzip
Gunzip(BufferedTransformation *attachment=NULL, bool repeat=false, int autoSignalPropagation=-1)
Exception::INVALID_DATA_FORMAT
received input data that doesn't conform to expected format
Definition: cryptlib.h:123
Gunzip::TailErr
Definition: gzip.h:37
Gunzip::HeaderErr
Definition: gzip.h:36
Inflator
DEFLATE (RFC 1951) decompressor.
Definition: zinflate.h:85
Gzip
GZIP Compression (RFC 1952)
Definition: gzip.h:11
CRC32
CRC Checksum Calculation.
Definition: crc.h:19
NameValuePairs
interface for retrieving values given their names
Definition: cryptlib.h:224