Option IOptionComplexFactory.CreateInstance(byte[] buffer, ref int offset, byte valueLength)
{
if ((int)valueLength != 2)
{
return((Option)null);
}
return((Option) new IpV4OptionStreamIdentifier(ByteArrayExtensions.ReadUShort(buffer, ref offset, Endianity.Big)));
}
Option IOptionComplexFactory.CreateInstance(byte[] buffer, ref int offset, byte valueLength)
{
if ((int)valueLength != 2)
{
return((Option)null);
}
return((Option) new TcpOptionMaximumSegmentSize(ByteArrayExtensions.ReadUShort(buffer, ref offset, Endianity.Big)));
}
Option IOptionComplexFactory.CreateInstance(byte[] buffer, ref int offset, byte valueLength)
{
if ((int)valueLength != 10)
{
return((Option)null);
}
return((Option) new IpV4OptionTraceRoute(ByteArrayExtensions.ReadUShort(buffer, ref offset, Endianity.Big), ByteArrayExtensions.ReadUShort(buffer, ref offset, Endianity.Big), ByteArrayExtensions.ReadUShort(buffer, ref offset, Endianity.Big), ByteArrayExtensions.ReadIpV4Address(buffer, ref offset, Endianity.Big)));
}
private static bool TryReadEntry(byte[] buffer, int payloadOffset, int payloadLength, GreSourceRouteEntryAddressFamily addressFamily, int offsetInPayload, out GreSourceRouteEntry entry)
{
entry = (GreSourceRouteEntry)null;
switch (addressFamily)
{
case GreSourceRouteEntryAddressFamily.IpSourceRoute:
if (offsetInPayload % 4 != 0 || payloadLength % 4 != 0)
{
return(false);
}
int length1 = payloadLength / 4;
IpV4Address[] addresses = new IpV4Address[length1];
for (int index = 0; index != length1; ++index)
{
addresses[index] = ByteArrayExtensions.ReadIpV4Address(buffer, payloadOffset + index * 4, Endianity.Big);
}
entry = (GreSourceRouteEntry) new GreSourceRouteEntryIp(addresses, offsetInPayload / 4);
return(true);
case GreSourceRouteEntryAddressFamily.AsSourceRoute:
if (offsetInPayload % 2 != 0 || payloadLength % 2 != 0)
{
return(false);
}
int length2 = payloadLength / 2;
ushort[] asNumbers = new ushort[length2];
for (int index = 0; index != length2; ++index)
{
asNumbers[index] = ByteArrayExtensions.ReadUShort(buffer, payloadOffset + index * 2, Endianity.Big);
}
entry = (GreSourceRouteEntry) new GreSourceRouteEntryAs(asNumbers, offsetInPayload / 2);
return(true);
default:
Datagram data = new Datagram(buffer, payloadOffset, payloadLength);
entry = (GreSourceRouteEntry) new GreSourceRouteEntryUnknown(addressFamily, data, offsetInPayload);
return(true);
}
}
internal IgmpGroupRecordDatagram(byte[] buffer, int offset)
: base(buffer, offset, buffer.Length - offset < 8 ? buffer.Length - offset : Math.Min(buffer.Length - offset, 8 + 4 * (int)ByteArrayExtensions.ReadUShort(buffer, offset + 2, Endianity.Big) + 4 * (int)ByteArrayExtensions.ReadByte(buffer, offset + 1)))
{
}
internal static bool TryReadEntry(byte[] buffer, ref int offset, int length, out GreSourceRouteEntry entry)
{
entry = (GreSourceRouteEntry)null;
if (length < 4)
{
return(false);
}
GreSourceRouteEntryAddressFamily addressFamily = (GreSourceRouteEntryAddressFamily)ByteArrayExtensions.ReadUShort(buffer, offset, Endianity.Big);
byte num1 = buffer[offset + 3];
if ((int)num1 == 0)
{
return(addressFamily == GreSourceRouteEntryAddressFamily.None);
}
if (4 + (int)num1 > length)
{
return(false);
}
byte num2 = buffer[offset + 2];
if ((int)num2 > (int)num1 || !GreSourceRouteEntry.TryReadEntry(buffer, offset + 4, (int)num1, addressFamily, (int)num2, out entry))
{
return(false);
}
offset += entry.Length;
return(true);
}