Option IOptionComplexFactory.CreateInstance(byte[] buffer, ref int offset, byte valueLength)
{
if ((int)valueLength < 0 || (int)valueLength % 8 != 0)
{
return((Option)null);
}
int length = (int)valueLength / 8;
TcpOptionSelectiveAcknowledgmentBlock[] acknowledgmentBlockArray = new TcpOptionSelectiveAcknowledgmentBlock[length];
for (int index = 0; index != length; ++index)
{
acknowledgmentBlockArray[index] = new TcpOptionSelectiveAcknowledgmentBlock(ByteArrayExtensions.ReadUInt(buffer, ref offset, Endianity.Big), ByteArrayExtensions.ReadUInt(buffer, ref offset, Endianity.Big));
}
return((Option) new TcpOptionSelectiveAcknowledgment((IList <TcpOptionSelectiveAcknowledgmentBlock>)acknowledgmentBlockArray));
}
/// <summary>
/// Tries to read the option from a buffer starting from the option value (after the type and length).
/// </summary>
/// <param name="buffer">The buffer to read the option from.</param>
/// <param name="offset">The offset to the first byte to read the buffer. Will be incremented by the number of bytes read.</param>
/// <param name="valueLength">The number of bytes the option value should take according to the length field that was already read.</param>
/// <returns>On success - the complex option read. On failure - null.</returns>
Option IOptionComplexFactory.CreateInstance(byte[] buffer, ref int offset, byte valueLength)
{
if (valueLength < OptionValueMinimumLength || valueLength % TcpOptionSelectiveAcknowledgmentBlock.SizeOf != 0)
{
return(null);
}
int numBlocks = valueLength / TcpOptionSelectiveAcknowledgmentBlock.SizeOf;
TcpOptionSelectiveAcknowledgmentBlock[] blocks = new TcpOptionSelectiveAcknowledgmentBlock[numBlocks];
for (int i = 0; i != numBlocks; ++i)
{
blocks[i] = new TcpOptionSelectiveAcknowledgmentBlock(buffer.ReadUInt(ref offset, Endianity.Big),
buffer.ReadUInt(ref offset, Endianity.Big));
}
return(new TcpOptionSelectiveAcknowledgment(blocks));
}