private static void ParseBuffer(RecvState state, int dataLength)
{
if (dataLength == 0)
{
return;
}
byte[] workingBuf;
if (state.m_PrevLeftoverBuf != null)
{
workingBuf = new byte[dataLength + state.m_PrevLeftoverBuf.Length];
Buffer.BlockCopy(state.m_PrevLeftoverBuf, 0, workingBuf, 0, state.m_PrevLeftoverBuf.Length);
Buffer.BlockCopy(state.m_buf, 0, workingBuf, state.m_PrevLeftoverBuf.Length, dataLength);
state.m_PrevLeftoverBuf = null;
dataLength = workingBuf.Length;
}
else
{
workingBuf = state.m_buf;
}
int expectedTotalPacketLen = 0;
int packetLenBytes = 0;
for (int i = 0; i < dataLength;)
{
/********************************************************************/
// Read packet length
/********************************************************************/
packetLenBytes = 1;
state.m_bytesLenBuf = 1;
expectedTotalPacketLen = workingBuf[i] & 0x7F;
while ((workingBuf[i] & 0x80) == 0x80)
{
i++;
if (i < dataLength)
{
expectedTotalPacketLen <<= 7;
expectedTotalPacketLen += workingBuf[i] & 0x7F;
packetLenBytes++;
state.m_bytesLenBuf = packetLenBytes;
}
else
{
state.m_PrevLeftoverBuf = new byte[packetLenBytes];
Buffer.BlockCopy(workingBuf, i - packetLenBytes, state.m_PrevLeftoverBuf, 0, packetLenBytes);
StartRecvPacket(state);
return;
}
}
/********************************************************************/
// End Read packet length
/********************************************************************/
i++;
int packetBytesRecived = Math.Min(expectedTotalPacketLen, dataLength - i);
if (packetBytesRecived < expectedTotalPacketLen)
{
state.m_PrevLeftoverBuf = new byte[packetBytesRecived + packetLenBytes];
Array.Copy(workingBuf, i - packetLenBytes, state.m_PrevLeftoverBuf, 0, packetBytesRecived + packetLenBytes);
if (!state.m_recvLoop)
{
state.m_buf = new byte[expectedTotalPacketLen - packetBytesRecived];
}
state.m_OnRecvProgress?.Invoke(packetBytesRecived, expectedTotalPacketLen);
StartRecvPacket(state);
return;
}
byte[] data = new byte[packetBytesRecived];
Array.Copy(workingBuf, i, data, 0, packetBytesRecived);
state.m_OnRecv(data, data.Length + state.m_bytesLenBuf);
i += packetBytesRecived;
}
if (state.m_recvLoop)
{
StartRecvPacket(state);
}
}
