通用循环缓冲区类(c++版)

// 声明

class CCycleBuffer 
{
public:
 BOOL isFull();
 BOOL isEmpty();
 void Empty();
 int GetLength();
 CCycleBuffer(int size);
 virtual ~CCycleBuffer();
 int Write(char* buf, int count);
 int Read(char* buf, int count);
private:
 BOOL m_bEmpty, m_bFull;
 char * m_pBuf;
 int m_nBufSize;
 int m_nReadPos;
 int m_nWritePos;
};

// 定义

CCycleBuffer::CCycleBuffer(int size)
{
 m_nBufSize = size;
 m_nReadPos = 0;
 m_nWritePos = 0;
 m_pBuf = new char[m_nBufSize];
 m_bEmpty = TRUE;
 m_bFull = FALSE;
}

CCycleBuffer::~CCycleBuffer()
{
 delete[] m_pBuf;
}

/************************************************************************/
/* 向缓冲区写入数据，返回实际写入的字节数                               */
/************************************************************************/
int CCycleBuffer::Write(char* buf, int count)
{
 if(count <= 0) return 0;

 m_bEmpty = FALSE;

 // 缓冲区已满，不能继续写入
 if(m_bFull) 
 {
  return 0;
 }
 else if(m_nReadPos == m_nWritePos) // 缓冲区为空时
 {
  /*                          == 内存模型 ==
             (empty)             m_nReadPos                (empty)                     
  |----------------------------------|-----------------------------------------|
                &