//-----------------------------------------------------------------------------+
// Copyright (C), 1998-2007, Beijing Tangent Software Co. Ltd.
// = FileName	:   TWArchive.h
// = Version	:   ver2.0
// = Author		:   xlc
// = CreateDate	:   2002-09-09
// = Description:   类的声明
// = Maintainers: 
//                  
//-----------------------------------------------------------------------------+
#ifndef _TWARCHIVE_H_
#define _TWARCHIVE_H_

//数据流
class GEOAPI TWArchive
{
public:

	TWArchive();
	
	virtual ~TWArchive();

	//清空并初始化为初始状态
	virtual void Clear();
	
	//移动游标
	virtual void MoveTo(long i);

	//当前游标处读取数据，不移动游标
	virtual void Read(void *p, long size) = 0;

	//当前游标处写入数据，自动增长数据长度!不移动游标
	virtual void Write(void *p, long size) = 0;

	long GetLength()const;

	long GetCur()const;

	bool IsOut()const;

	//移动游标
	void MoveToFirst();
	
	void MoveToLast();
	
	void MoveOut();

	void MoveToNext(long step = 1);
	
	void MoveToPre(long step = 1);

	//当前游标位置读取，不移动游标
	void Read(char &val);
	void Read(bool &val);
	void Read(short &val);
	void Read(int &val);
	void Read(long &val);
	void Read(float &val);
	void Read(double &val);
	void Read(long double &val);

	//当前游标位置写，不移动游标
	void Write(char val);
	void Write(bool val);
	void Write(short val);
	void Write(int val);
	void Write(long val);
	void Write(float val);
	void Write(double val);
	void Write(long double val);

	//末尾添加并后移游标
	void Append(void *p,long size);
	
	TWArchive& operator << (char val);
	TWArchive& operator << (bool val);
	TWArchive& operator << (short val);
	TWArchive& operator << (int  val);
	TWArchive& operator << (long val);
	TWArchive& operator << (float val);
	TWArchive& operator << (double val);
	TWArchive& operator << (long double val);

	//当前游标位置读数据并后移游标
	TWArchive& operator >> (char &val);
	TWArchive& operator >> (bool &val);
	TWArchive& operator >> (short  &val);
	TWArchive& operator >> (int  &val);
	TWArchive& operator >> (long &val);
	TWArchive& operator >> (float &val);
	TWArchive& operator >> (double &val);
	TWArchive& operator >> (long double &val);

	bool operator > (const TWArchive &ar)const;
	bool operator < (const TWArchive &ar)const;

protected:

	//字节数
	long m_iLength;
	
	//游标,始终>=0!
	long m_iCur;
};

#endif