zinflate.h

300种加密解密的算法源代码

#ifndef CRYPTOPP_ZINFLATE_H
#define CRYPTOPP_ZINFLATE_H

#include "forkjoin.h"
#include "misc.h"
#include "queue.h"

NAMESPACE_BEGIN(CryptoPP)

class Inflator : public Fork
{
public:
	class Err : public Exception {public: Err(const char *message) : Exception(message) {}};
	class UnexpectedEndErr : public Err {public: UnexpectedEndErr() : Err("Inflator: unexpected end of compressed block") {}};

	Inflator(BufferedTransformation *output = NULL,
			 BufferedTransformation *bypassed = NULL);

	void Put(byte b)
		{Inflator::Put(&b, 1);}

	void Put(const byte *inString, unsigned int length);
	void InputFinished();

private:
	struct huft {
	  byte e;                /* number of extra bits or operation */
	  byte b;                /* number of bits in this code or subcode */
	  union {
		word16 n;              /* literal, length base, or distance base */
		struct huft *t;     /* pointer to next level of table */
	  } v;
	};

	int huft_build (unsigned *, unsigned, unsigned, const word16 *, const word16 *,
					   huft **, int *);
	int huft_free (huft *);
	int inflate_codes (huft *, huft *, int, int);
	int inflate_stored (void);
	int inflate_fixed (void);
	int inflate_dynamic (void);
	int inflate_block (bool &);
	void flush_output(unsigned int w);

	static const word16 border[19];
	static const word16 cplens[31];
	static const word16 cplext[31];
	static const word16 cpdist[31];
	static const word16 cpdext[31];

	static const word16 mask_bits[18];

	ByteQueue inQueue;
	byte NEXTBYTE();

	SecByteBlock slide;
	unsigned int wp;
	word32 bb;                         /* bit buffer */
	unsigned bk;                    /* bits in bit buffer */

	bool afterEnd;
};

NAMESPACE_END

#endif