#include "stdafx.h"
#ifdef CMD_ANSYNC
#include "memory.h"
#include "windows.h"
#include "RingBuffer.h"

CRingBuffer::CRingBuffer()
{
    m_pObj = NULL;
}

int CRingBuffer::Init(int nObj, int nObjSize)
{
    m_nObj = nObj;
    m_nObjSize = nObjSize;
    m_nInput = 0;
    m_nOutput = 0;
    m_pObj = new unsigned char[nObjSize * nObj];
    InitializeCriticalSection(&m_stCS);
    return 0;
}

int CRingBuffer::Fini()
{
    if (NULL != m_pObj)
    delete m_pObj;
    return 0;
}

int CRingBuffer::Input(void * pObj)
{
    return OPObj(1, pObj);
}

int CRingBuffer::Output(void * pObj)
{
    return OPObj(0, pObj);
}

int CRingBuffer::OPObj(int nAction, void * pObj)
{
    int nPos = -1;
    EnterCriticalSection(&m_stCS);
    if (0 == nAction)
    {
        if (m_nInput > m_nOutput)
        {
            nPos = m_nOutput % m_nObj;
            memcpy(pObj, (char *)m_pObj + m_nObjSize * m_nOutput, m_nObjSize);
            m_nOutput++;
       }
    }
    else
    {
        if (m_nInput - m_nObj < m_nOutput)
        {
            nPos = m_nInput % m_nObj;
            memcpy((char *)m_pObj + m_nObjSize * m_nOutput, pObj, m_nObjSize);
            m_nInput++;
        }
    }
    LeaveCriticalSection(&m_stCS);

    return nPos;
}
#endif