initial checkin

MAC_SDK/Source/Shared/RollBuffer.h

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+#ifndef APE_ROLLBUFFER_H
+#define APE_ROLLBUFFER_H
+
+template <class TYPE> class CRollBuffer
+{
+public:
+
+    CRollBuffer()
+    {
+        m_pData = NULL;
+        m_pCurrent = NULL;
+    }
+
+    ~CRollBuffer()
+    {
+        SAFE_ARRAY_DELETE(m_pData);
+    }
+
+    int Create(int nWindowElements, int nHistoryElements)
+    {
+        SAFE_ARRAY_DELETE(m_pData)
+        m_nWindowElements = nWindowElements;
+        m_nHistoryElements = nHistoryElements;
+
+        m_pData = new TYPE[m_nWindowElements + m_nHistoryElements];
+        if (m_pData == NULL)
+            return ERROR_INSUFFICIENT_MEMORY;
+
+        Flush();
+        return 0;
+    }
+
+    void Flush()
+    {
+        ZeroMemory(m_pData, (m_nHistoryElements + 1) * sizeof(TYPE));
+        m_pCurrent = &m_pData[m_nHistoryElements];
+    }
+
+    void Roll()
+    {
+        memcpy(&m_pData[0], &m_pCurrent[-m_nHistoryElements], m_nHistoryElements * sizeof(TYPE));
+        m_pCurrent = &m_pData[m_nHistoryElements];
+    }
+
+    __inline void IncrementSafe()
+    {
+        m_pCurrent++;
+        if (m_pCurrent == &m_pData[m_nWindowElements + m_nHistoryElements])
+            Roll();
+    }
+
+    __inline void IncrementFast()
+    {
+        m_pCurrent++;
+    }
+
+    __inline TYPE & operator[](const int nIndex) const
+    {
+        return m_pCurrent[nIndex];
+    }
+
+protected:
+
+    TYPE * m_pData;
+    TYPE * m_pCurrent;
+    int m_nHistoryElements;
+    int m_nWindowElements;
+};
+
+template <class TYPE, int WINDOW_ELEMENTS, int HISTORY_ELEMENTS> class CRollBufferFast
+{
+public:
+
+    CRollBufferFast()
+    {
+        m_pData = new TYPE[WINDOW_ELEMENTS + HISTORY_ELEMENTS];
+        Flush();
+    }
+
+    ~CRollBufferFast()
+    {
+        SAFE_ARRAY_DELETE(m_pData);
+    }
+
+    void Flush()
+    {
+        ZeroMemory(m_pData, (HISTORY_ELEMENTS + 1) * sizeof(TYPE));
+        m_pCurrent = &m_pData[HISTORY_ELEMENTS];
+    }
+
+    void Roll()
+    {
+        memcpy(&m_pData[0], &m_pCurrent[-HISTORY_ELEMENTS], HISTORY_ELEMENTS * sizeof(TYPE));
+        m_pCurrent = &m_pData[HISTORY_ELEMENTS];
+    }
+
+    __inline void IncrementSafe()
+    {
+        m_pCurrent++;
+        if (m_pCurrent == &m_pData[WINDOW_ELEMENTS + HISTORY_ELEMENTS])
+            Roll();
+    }
+
+    __inline void IncrementFast()
+    {
+        m_pCurrent++;
+    }
+
+    __inline TYPE & operator[](const int nIndex) const
+    {
+        return m_pCurrent[nIndex];
+    }
+
+protected:
+
+    TYPE * m_pData;
+    TYPE * m_pCurrent;
+};
+
+#endif // #ifndef APE_ROLLBUFFER_H