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/********************************************************************
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Created Date: 2009-11-05
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Author: wuding
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Version: 2.0
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Last Version Date: 2010-06-13
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Modified History:
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version Date Author Description
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2009-11-05 wuding version 1.0 加入堆内存，为了缓解内存碎片问题
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2010-06-13 wuding version 2.0 修正几个LoadFromFile引起的bug,重写IncreaseSize,SetBlobContent等方法，优化内存分配。
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2012-12-13 wuding version 3.0 调整接口名称以适应image
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********************************************************************/
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#pragma once
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#ifndef __MEMORY_BUFFER_H
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#define __MEMORY_BUFFER_H
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#pragma warning(disable: 4786)
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class BlobBuffer
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{
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public:
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enum { BLOB_BUFFER_BLOCK_SIZE = 8 * 1204 };
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private:
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unsigned char *m_BlobPtr; //实际数据指针
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unsigned long m_lBlobLen; //实际数据总大小
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unsigned long m_lBufferLen; //缓冲区总大小
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unsigned long m_ReadLen; //读取位置
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unsigned char m_BlobBuffer[BLOB_BUFFER_BLOCK_SIZE];
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void Reset();
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public:
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BlobBuffer();
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~BlobBuffer();
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void Clear();
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void ClearContent();
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void ResetRead();
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/*
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将缓冲区再扩大nIncreaseSize,bCopyOldData==false表示，分配新的空间后，旧的数据不要拷贝到新空间上
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bAllocBufLen true表示设置缓冲内容长度，false表示函数调完后不影响原有GetBlobLength
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*/
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void IncreaseBufferSize(unsigned long nIncreaseSize, bool bCopyOldData = true);
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void AllocBuffer(unsigned long nBufSize);
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unsigned long GetBlobLength() const;
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unsigned long GetBlobBufferLength();
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const unsigned char *GetBlobPtr();
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unsigned char *GetBlobRealPtr();
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void SetBlobContent(const unsigned char *BlobPtr, unsigned long nBlobLen);
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void AppendBlobContent(const unsigned char *BlobPtr, unsigned long nBlobLen);
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void AppendBlobContentChar(const unsigned char BlobChar);
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bool LoadBlobFromFile(const char *sFileName);
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bool SaveBlobToFile(const char *sFileName);
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bool LoadBlobFromFile(const wchar_t *sFileName);
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bool SaveBlobToFile(const wchar_t *sFileName);
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};
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#endif
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