Initial revision

git-svn-id: svn://svn.code.sf.net/p/cryptopp/code/trunk/c5@2 57ff6487-cd31-0410-9ec3-f628ee90f5f0

1 files changed, 65 insertions, 0 deletions

diff --git a/gzip.h b/gzip.h
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index 0000000..134f694
--- /dev/null
+++ b/gzip.h
@@ -0,0 +1,65 @@
+#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)
+		: Deflator(attachment, deflateLevel, log2WindowSize) {}
+	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, unsigned int length);
+	void WritePoststreamTail();
+
+	unsigned long 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, unsigned int length);
+	unsigned int MaxPoststreamTailSize() const {return 8;}
+	void ProcessPoststreamTail();
+
+	unsigned long m_length;
+	CRC32 m_crc;
+};
+
+NAMESPACE_END
+
+#endif