60 lines
1.3 KiB
C++
Executable File
60 lines
1.3 KiB
C++
Executable File
#ifndef APE_CIRCLEBUFFER_H
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#define APE_CIRCLEBUFFER_H
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class CCircleBuffer
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{
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public:
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// construction / destruction
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CCircleBuffer();
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virtual ~CCircleBuffer();
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// create the buffer
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void CreateBuffer(int nBytes, int nMaxDirectWriteBytes);
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// query
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int MaxAdd();
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int MaxGet();
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// direct writing
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inline unsigned char * CCircleBuffer::GetDirectWritePointer()
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{
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// return a pointer to the tail -- note that it will always be safe to write
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// at least m_nMaxDirectWriteBytes since we use an end cap region
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return &m_pBuffer[m_nTail];
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}
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inline void CCircleBuffer::UpdateAfterDirectWrite(int nBytes)
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{
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// update the tail
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m_nTail += nBytes;
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// if the tail enters the "end cap" area, set the end cap and loop around
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if (m_nTail >= (m_nTotal - m_nMaxDirectWriteBytes))
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{
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m_nEndCap = m_nTail;
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m_nTail = 0;
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}
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}
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// get data
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int Get(unsigned char * pBuffer, int nBytes);
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// remove / empty
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void Empty();
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int RemoveHead(int nBytes);
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int RemoveTail(int nBytes);
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private:
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int m_nTotal;
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int m_nMaxDirectWriteBytes;
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int m_nEndCap;
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int m_nHead;
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int m_nTail;
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unsigned char * m_pBuffer;
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};
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#endif // #ifndef APE_CIRCLEBUFFER_H
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