tabbinblockmanager.h

linux下一款GIS程序源码

// tabbinblockmanager.h: interface for the TABBinBlockManager class.
//
/*---------------------------------------------------------------------
 *                      class TABBinBlockManager
 *
 * This class is used to keep track of allocated blocks and is used
 * by various classes that need to allocate a new block in a .MAP file.
 *--------------------------------------------------------------------*/
#ifndef  TABBinBlockManager_H
#define  TABBinBlockManager_H

#include "ugkglobal.h"

class TABBinBlockManager  
{
  protected:
    int         m_nBlockSize;
    UGKInt32      m_nLastAllocatedBlock;  //上一次分配块的地址
public:
	TABBinBlockManager(int nBlockSize=512){m_nBlockSize=nBlockSize;
	                                       m_nLastAllocatedBlock = -1;}
	virtual ~TABBinBlockManager(){};

    UGKInt32      AllocNewBlock()   {if (m_nLastAllocatedBlock==-1)
                                        m_nLastAllocatedBlock = 0;
                                   else
                                        m_nLastAllocatedBlock+=m_nBlockSize;
                                   return m_nLastAllocatedBlock; };
    void        Reset()  {m_nLastAllocatedBlock=-1; };
    void        SetLastPtr(int nBlockPtr) {m_nLastAllocatedBlock=nBlockPtr; };

};

#endif