protected static bool CanStartWith(byte[] buffer, PacketLengthHandler packetLengthCallback, int bufferLength = -1)
{
if (bufferLength < 0)
{
bufferLength = buffer.Length;
}
int packetLength = packetLengthCallback(buffer, bufferLength);
if (packetLength > -1 && packetLength < PacketLengthMin)
{
return(false);
}
if (bufferLength < PacketLengthMin)
{
return(true);
}
if (bufferLength >= packetLength && !IsValid(buffer, packetLengthCallback, bufferLength))
{
return(false);
}
return(true);
}
protected static new bool IsValid(byte[] buffer, PacketLengthHandler packetLengthCallback, int bufferLength = -1)
{
if (bufferLength < 0)
{
bufferLength = buffer.Length;
}
if (bufferLength < PacketLengthMin)
{
return(false);
}
byte packetLength = (byte)ParsePacketLength(buffer, bufferLength);
if (bufferLength < packetLength || packetLength < PacketLengthMin)
{
return(false);
}
byte check = 0x00;
for (byte i = 0; i < packetLength - 1; i++)
{
check ^= buffer[i];
}
return(check == buffer[packetLength - 1]);
}
protected static bool IsValid(byte[] buffer, PacketLengthHandler packetLengthCallback, int bufferLength = -1)
{
if (bufferLength < 0)
{
bufferLength = buffer.Length;
}
if (bufferLength < PacketLengthMin)
{
return(false);
}
int packetLength = packetLengthCallback(buffer, bufferLength);
if (bufferLength < packetLength || packetLength < PacketLengthMin)
{
return(false);
}
var packetCheck = buffer[packetLength - 1];
if (packetCheck == 0x00 && packetLength > 8)
{
// find corrupted packet as a part of current packet
for (int i = packetLength / 2; i < packetLength - 1; i++)
{
var theSame = true;
for (int ic = i, io = 0; ic < packetLength - 1 && io < i; ic++, io++)
{
if (buffer[ic] != buffer[io])
{
theSame = false;
break;
}
}
if (theSame)
{
return(false);
}
}
}
byte check = 0x00;
for (int i = 0; i < packetLength - 1; i++)
{
check ^= buffer[i];
}
return(check == packetCheck);
}
