/// <summary>
/// Attempts to parse raw data into a structured packet
/// </summary>
/// <param name="buffer">Raw data to parse</param>
/// <param name="packet">Parsed packet</param>
/// <param name="count">The length of the packet in bytes</param>
/// <param name="index">The index into the buffer at which the packet begins</param>
/// <returns>True if parsing was successful, false if it is not.</returns>
internal static bool TryParse(byte[] buffer, int index, int count, out WakeOnLan packet)
{
try
{
if (count < MinimumParseableBytes)
{
packet = null;
return false;
}
// Too many bytes
if (count > 108)
{
packet = null;
return false;
}
using (var ms = new MemoryStream(buffer, index, count, false))
{
using (var br = new BinaryReader(ms))
{
for (var i = 0; i < 6; i++)
{
if (br.ReadByte() != 255)
{
// TODO: Option to ignore
// Invalid synchronization stream.
packet = null;
return false;
}
}
packet = new WakeOnLan();
packet.DstMac = br.ReadBytes(6);
for (var i = 0; i < 15; i++)
{
var tmpMac = br.ReadBytes(6);
if (!tmpMac.SequenceEqual(packet.DstMac))
{
// TODO: Option to ignore
// Invalid target mac repetition
packet = null;
return false;
}
}
if (count - br.BaseStream.Position >= 6)
{
packet.Password = br.ReadBytes(6);
}
else if (count - br.BaseStream.Position >= 4)
{
packet.Password = br.ReadBytes(4);
}
else
{
packet.Password = Array.Empty<byte>();
}
return true;
}
}
}
catch (Exception)
{
packet = null;
return false;
}
}
/// <summary>
/// Attempts to parse raw data into a structured packet
/// </summary>
/// <param name="buffer">Raw data to parse</param>
/// <param name="packet">Parsed packet</param>
/// <param name="count">The length of the packet in bytes</param>
/// <param name="index">The index into the buffer at which the packet begins</param>
/// <returns>True if parsing was successful, false if it is not.</returns>
internal static bool TryParse(byte[] buffer, int index, int count, out WakeOnLan packet)
{
try
{
if (count < MinimumParseableBytes)
{
packet = null;
return(false);
}
// Too many bytes
if (count > 108)
{
packet = null;
return(false);
}
using (var ms = new MemoryStream(buffer, index, count, false))
{
using (var br = new BinaryReader(ms))
{
for (var i = 0; i < 6; i++)
{
if (br.ReadByte() != 255)
{
// TODO: Option to ignore
// Invalid synchronization stream.
packet = null;
return(false);
}
}
packet = new WakeOnLan();
packet.DstMac = br.ReadBytes(6);
for (var i = 0; i < 15; i++)
{
var tmpMac = br.ReadBytes(6);
if (!tmpMac.SequenceEqual(packet.DstMac))
{
// TODO: Option to ignore
// Invalid target mac repetition
packet = null;
return(false);
}
}
if (count - br.BaseStream.Position >= 6)
{
packet.Password = br.ReadBytes(6);
}
else if (count - br.BaseStream.Position >= 4)
{
packet.Password = br.ReadBytes(4);
}
else
{
packet.Password = Array.Empty <byte>();
}
return(true);
}
}
}
catch (Exception)
{
packet = null;
return(false);
}
}
