public override void Send(Message message)
{
var blockInfo = NegotiateBlockSize(message);
var isBlockwise = message.Payload.Length > BlockOption.DecodeSzx(blockInfo.Szx);
if (isBlockwise)
{
if (!message.HasToken)
{
message.Token = _tokenManager.AcquireToken();
}
var block = message.GetBlock(blockInfo);
var optionNumber = message is Request ? OptionNumber.Block1 : OptionNumber.Block2;
if (block.GetBlockOption(optionNumber).M > 0)
{
_incomplete.Add(message.GetTransactionKey(), message);
}
SendMessageOverLowerLayer(block);
}
else
{
SendMessageOverLowerLayer(message);
}
}
public void Should_decode_szx()
{
var blockSize1 = BlockOption.DecodeSzx(1);
var blockSize2 = BlockOption.DecodeSzx(3);
Assert.AreEqual(32, blockSize1);
Assert.AreEqual(128, blockSize2);
}
public void Should_construct_block2_option()
{
var option = new BlockOption(OptionNumber.Block2, 2, 0, BlockOption.EncodeSzx(32));
Assert.AreEqual(33, ByteConverter.GetInt(option.Value));
Assert.AreEqual(2, option.Num);
Assert.AreEqual(0, option.M);
Assert.AreEqual(32, BlockOption.DecodeSzx(option.Szx));
}
public void Should_construct_block1_option()
{
var option = new BlockOption(OptionNumber.Block1, 3, 1, BlockOption.EncodeSzx(128));
Assert.AreEqual(59, ByteConverter.GetInt(option.Value));
Assert.AreEqual(3, option.Num);
Assert.AreEqual(1, option.M);
Assert.AreEqual(128, BlockOption.DecodeSzx(option.Szx));
}
public static Message GetBlock(this Message message, int num, int szx)
{
var blockSize = BlockOption.DecodeSzx(szx);
var payloadOffset = num * blockSize;
var payloadLeft = message.Payload.Length - payloadOffset;
if (payloadLeft > 0)
{
var block = message is Request
? (Message) new Request(message.Code, message.Type == MessageType.Confirmable)
{
Id = message.Id
}
: new Response(message.Type, message.Code)
{
Id = message.Id
};
foreach (var option in message.Options)
{
block.AddOption(option);
}
var m = blockSize < payloadLeft ? 1 : 0;
if (m == 0)
{
blockSize = payloadLeft;
}
var payload = new byte[blockSize];
Buffer.BlockCopy(message.Payload, payloadOffset, payload, 0, blockSize);
block.Payload = payload;
var optionNumber = message is Request ? OptionNumber.Block1 : OptionNumber.Block2;
block.AddOption(new BlockOption(optionNumber, num, m, szx));
return(block);
}
return(null);
}
