public new static bool TryParse(Frame parentFrame, int packetStartIndex, int packetEndIndex, out AbstractPacket result)
{
/**
* The control file must be an ASCII stream with the ends of lines
* indicated by ASCII LF.
* [...]
* Once all of the contents have
* been delivered, an octet of zero bits is sent as an indication that
* the file being sent is complete.
*/
result = null;
if (parentFrame.Data[packetEndIndex] != 0x00)
{
return(false);
}
if (packetEndIndex > packetStartIndex && parentFrame.Data[packetEndIndex - 1] != 0x0a)
{
return(false);
}
for (int i = packetStartIndex; i < packetEndIndex - 1; i++)
{
if (parentFrame.Data[i] > 126)
{
return(false);
}
if (parentFrame.Data[i] != 0x0a && char.IsControl((char)parentFrame.Data[i]) && !WHITE_SPACE_CHARS.Contains((char)parentFrame.Data[i]))
{
return(false);
}
}
try {
result = new LpdControlFilePacket(parentFrame, packetStartIndex, packetEndIndex);
return(true);
}
catch {
return(false);
}
}
public static bool TryParse(Frame parentFrame, int packetStartIndex, int packetEndIndex, bool clientToServer, out AbstractPacket result)
{
result = null;
try {
if (clientToServer)
{
if (LpdRequestPacket.TryParseCommandLine(parentFrame.Data, packetStartIndex, packetEndIndex, out _, out _, out _))
{
result = new LpdRequestPacket(parentFrame, packetStartIndex, packetEndIndex);
}
else
{
return(LpdControlFilePacket.TryParse(parentFrame, packetStartIndex, packetEndIndex, out result));
}
}
else if (packetStartIndex == packetEndIndex)
{
result = new LpdResponsePacket(parentFrame, packetStartIndex);
}
}
catch { }
return(result != null);
}
