gzip.h

来自「各种加密算法的集合」· C头文件 代码 · 共 92 行

#ifndef CRYPTOPP_GZIP_H 
#define CRYPTOPP_GZIP_H 
 
#include "zdeflate.h" 
#include "zinflate.h" 
#include "crc.h" 
 
NAMESPACE_BEGIN(CryptoPP) 
 
class Gzip : public Deflator 
{ 
public: 
	Gzip(int deflate_level, BufferedTransformation *bt = NULL); 
 
	void Put(byte inByte); 
	void Put(const byte *inString, unsigned int length); 
	void InputFinished(); 
 
protected: 
	enum {MAGIC1=0x1f, MAGIC2=0x8b,   // flags for the header 
		  DEFLATED=8, FAST=4, SLOW=2}; 
 
	unsigned long totalLen; 
	CRC32 crc; 
}; 
 
class Gunzip : public Fork 
{ 
public: 
	class Err : public Exception {public: Err(const char *message) : Exception(message) {}}; 
	class HeaderErr : public Err {public: HeaderErr() : Err("Gunzip: header decoding error") {}}; 
	class CrcErr : public Err {public: CrcErr() : Err("Gunzip: CRC check error") {}}; 
	class LengthErr : public Err {public: LengthErr() : Err("Gunzip: length check error") {}}; 
 
	Gunzip(BufferedTransformation *output = NULL, 
		   BufferedTransformation *bypassed = NULL); 
 
	void Put(byte inByte) {Put(&inByte, 1);} 
	void Put(const byte *inString, unsigned int length); 
	void InputFinished(); 
 
protected: 
	enum {MAGIC1=0x1f, MAGIC2=0x8b,   // flags for the header 
		  DEFLATED=8, 
		  MAX_HEADERSIZE=1024}; 
 
	enum FLAG_MASKS { 
		CONTINUED=2, EXTRA_FIELDS=4, FILENAME=8, COMMENTS=16, ENCRYPTED=32}; 
 
	class BodyProcesser : public Sink 
	{ 
	public: 
		BodyProcesser(Gunzip &parent); 
		void Put(byte inByte) {Put(&inByte, 1);} 
		void Put(const byte *inString, unsigned int length); 
	private: 
		Gunzip &parent; 
	}; 
 
	class TailProcesser : public Sink 
	{ 
	public: 
		TailProcesser(Gunzip &parent); 
		void Put(byte inByte) {Put(&inByte, 1);} 
		void Put(const byte *inString, unsigned int length); 
	private: 
		Gunzip &parent; 
	}; 
 
	friend BodyProcesser; 
	friend TailProcesser; 
 
	void ProcessHeader(); 
	void ProcessTail(); 
 
	Inflator inflater; 
	ByteQueue inQueue; 
 
	unsigned long totalLen; 
	CRC32 crc; 
 
	byte tail[8]; 
	unsigned int tailLen; 
 
	enum State {PROCESS_HEADER, PROCESS_BODY, AFTER_END}; 
	State state; 
}; 
 
NAMESPACE_END 
 
#endif