/**********************************************************************************
Function Name : nAdvanceReadIndex(int& nIndex)
Output : CALL_SUCCESS for success. CALL_FAILURE for failure.
if allocated memory by the caller is not enough.
Functionality : Helper function. Advances the nIndex to the next entry
Member of : CMsgBufVVSE
Friend of : -
Authors : Pradeep Kadoor
Date Created : 22/06/2009
Modifications : -
************************************************************************************/
int CMsgBufVVSE::nAdvanceReadIndex(int& nReadIndex)
{
int nResult = CALL_SUCCESS;
static BYTE abyHeader[HEADER_LEN] = {0};
nGetCurrMsgHeader(nReadIndex, abyHeader); // Get current msg header TYPE, MSG LENGTH
int nMsgLen = 0;
memcpy(&nMsgLen, abyHeader + MSGLEN_OFFSET, DATA_LEN_SIZE);
if ((nReadIndex + HEADER_LEN + nMsgLen) < m_nBufferSize)
{
nReadIndex += (HEADER_LEN + nMsgLen);
}
else
{
nReadIndex = (nReadIndex + HEADER_LEN + nMsgLen) - m_nBufferSize;
}
return nResult;
}
/**********************************************************************************
Function Name : ReadBuffer()
Input(s) : TYPE, SIZE, pointer to the byte where header will be stored.
Output : CALL_SUCCESS for success. ERR_READ_MEMORY_SHORT
if allocated memory by the caller is not enough.
Functionality : Helper function. Current msg pointed by read index
is read.
Member of : CMsgBufVSE
Friend of : -
Authors : Pradeep Kadoor
Date Created : 22/06/2009
Modifications : -
************************************************************************************/
HRESULT CMsgBufVSE::ReadBuffer(INT& nType, BYTE* pbyMsg, INT& nSize)
{
HRESULT Return = CALL_SUCCESS;
BYTE abyHeader[HEADER_LEN];
Return = nGetCurrMsgHeader(abyHeader);
// It is expected to return CALL_SUCCESS
ASSERT(Return == CALL_SUCCESS);
DATA_LEN MsgLen = 0;
TYPE Type;
memcpy(&Type, (abyHeader + TYPE_OFFSET), TYPE_SIZE);
nType = (INT) Type;
memcpy(&MsgLen, (abyHeader + MSGLEN_OFFSET), DATA_LEN_SIZE);
if ((int) MsgLen > nSize)
{
Return = ERR_READ_MEMORY_SHORT;
nSize = MsgLen - nSize;
}
else
{
if ((m_nIndexRead + HEADER_LEN + MsgLen) <= m_nBufferSize)
{
memcpy(pbyMsg, (m_pbyMsgBuffer + m_nIndexRead + HEADER_LEN), MsgLen);
m_nIndexRead += (HEADER_LEN + MsgLen);
}
else if ((m_nIndexRead + HEADER_LEN) <= m_nBufferSize)
{
memcpy(pbyMsg, (m_pbyMsgBuffer + m_nIndexRead + HEADER_LEN), (m_nBufferSize - m_nIndexRead - HEADER_LEN));
memcpy((pbyMsg + (m_nBufferSize - m_nIndexRead - HEADER_LEN)), m_pbyMsgBuffer, (MsgLen - (m_nBufferSize - m_nIndexRead - HEADER_LEN)));
m_nIndexRead = MsgLen - (m_nBufferSize - m_nIndexRead - HEADER_LEN);
}
else
{
memcpy(pbyMsg, (m_pbyMsgBuffer + (m_nIndexRead + HEADER_LEN - m_nBufferSize)), MsgLen);
m_nIndexRead = (m_nIndexRead + HEADER_LEN - m_nBufferSize) + MsgLen;
}
nSize = MsgLen;
}
return Return;
}
/**********************************************************************************
Function Name : nAdvanceReadIndex()
Output : CALL_SUCCESS for success. CALL_FAILURE for failure.
if allocated memory by the caller is not enough.
Functionality : Helper function. Current msg is skipped.
Member of : CMsgBufVSE
Friend of : -
Authors : Pradeep Kadoor
Date Created : 22/06/2009
Modifications : -
************************************************************************************/
int CMsgBufVSE::nAdvanceReadIndex(void)
{
int nResult = CALL_SUCCESS;
static BYTE abyHeader[HEADER_LEN] = {0};
nGetCurrMsgHeader(abyHeader); // Get current msg header TYPE, MSG LENGTH
int nMsgLen = 0;
memcpy(&nMsgLen, abyHeader + MSGLEN_OFFSET, DATA_LEN_SIZE);
if ((m_nIndexRead + HEADER_LEN + nMsgLen) < m_nBufferSize)
{
m_nIndexRead += (HEADER_LEN + nMsgLen);
}
else
{
m_nIndexRead = (m_nIndexRead + HEADER_LEN + nMsgLen) - m_nBufferSize;
}
m_nMsgSkipped++;
m_nMsgCount--;
return nResult;
}
/**********************************************************************************
Function Name : ReadBuffer()
Input(s) : TYPE, SIZE, pointer to the byte where MSG will be stored.
Output : CALL_SUCCESS for success. ERR_READ_MEMORY_SHORT
if allocated memory by the caller is not enough.
Functionality : Helper function. Current msg pointed by nIndex
is read.
Member of : CMsgBufVVSE
Friend of : -
Authors : Pradeep Kadoor
Date Created : 22/06/2009
Modifications : -
************************************************************************************/
HRESULT CMsgBufVVSE::ReadBuffer(INT& nType, BYTE* pbyMsg, INT& nSize, INT& nIndex)
{
HRESULT Return = CALL_SUCCESS;
BYTE abyHeader[HEADER_LEN];
Return = nGetCurrMsgHeader(nIndex, abyHeader);
// It is expected to return CALL_SUCCESS
ASSERT(Return == CALL_SUCCESS);
int nMsgLen = 0;
memcpy(&nType, (abyHeader + TYPE_OFFSET), TYPE_SIZE);
memcpy(&nMsgLen, (abyHeader + MSGLEN_OFFSET), DATA_LEN_SIZE);
if (nMsgLen > nSize)
{
Return = ERR_READ_MEMORY_SHORT;
nSize = nMsgLen - nSize;
}
else
{
if ((nIndex + HEADER_LEN + nMsgLen) <= m_nBufferSize)
{
memcpy(pbyMsg, (m_pbyMsgBuffer + nIndex + HEADER_LEN), nMsgLen);
nIndex += (HEADER_LEN + nMsgLen);
}
else if ((nIndex + HEADER_LEN) <= m_nBufferSize)
{
memcpy(pbyMsg, (m_pbyMsgBuffer + nIndex + HEADER_LEN), (m_nBufferSize - nIndex - HEADER_LEN));
memcpy((pbyMsg + (m_nBufferSize - nIndex - HEADER_LEN)), m_pbyMsgBuffer, (nMsgLen - (m_nBufferSize - nIndex - HEADER_LEN)));
nIndex = nMsgLen - (m_nBufferSize - nIndex - HEADER_LEN);
}
else
{
memcpy(pbyMsg, (m_pbyMsgBuffer + (nIndex + HEADER_LEN - m_nBufferSize)), nMsgLen);
nIndex = (nIndex + HEADER_LEN - m_nBufferSize) + nMsgLen;
}
nSize = nMsgLen;
}
return Return;
}
