You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
74 lines
2.4 KiB
74 lines
2.4 KiB
#ifndef CRYPTOPP_GZIP_H |
|
#define CRYPTOPP_GZIP_H |
|
|
|
#include "cryptlib.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), m_totalLen(0) {} |
|
Gzip(const NameValuePairs ¶meters, BufferedTransformation *attachment=NULL) |
|
: Deflator(parameters, attachment), m_totalLen(0) {} |
|
|
|
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; |
|
}; |
|
|
|
//! \class Gunzip |
|
//! \brief 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") {}}; |
|
|
|
//! \brief Construct a Gunzip |
|
//! \param attachment a \ BufferedTransformation to attach to this object |
|
//! \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 { |
|
//! \brief First header magic value |
|
MAGIC1=0x1f, |
|
//! \brief Second header magic value |
|
MAGIC2=0x8b, |
|
//! \brief Deflated flag |
|
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
|
|
|