private int GetPayloadLength(IBufferStream bufferStream, int length)
{
if (length == 2)
{
var flag = bufferStream.ReadByte();
m_Final = (FINAL_FLAG & flag) == flag;
m_OpCode = (sbyte)(flag & 0x08);
// one byte playload length
var playloadLen = (int)bufferStream.ReadByte();
//the highest bit is mask indicator
m_Masked = playloadLen > 128;
// remove the mask byte
playloadLen = playloadLen % 128;
// no extend playload length
if (playloadLen < 126)
{
if (!m_Masked)
{
return(playloadLen);
}
// masking-key: 4 bytes
return(playloadLen + 4);
}
// playload length takes 2 bytes
if (playloadLen == 126)
{
ResetSize(4);
return(-1);
}
else// playload length takes 8 bytes
{
ResetSize(10);
return(-1);
}
}
else if (length == 4)
{
bufferStream.Skip(2);
// 2 bytes
var playloadLen = bufferStream.ReadUInt16();
if (m_Masked) // add mask key's length
{
playloadLen += 4;
}
return(playloadLen);
}
else // length = 8
{
bufferStream.Skip(2);
// 8 bytes
var playloadLen = bufferStream.ReadUInt64();
if (m_Masked) // add mask key's length
{
playloadLen += 4;
}
return((int)playloadLen);
}
}