public static IList <RLPItem> Decode(byte[] input)
{
var message = new RLPMessage(input);
while (message.Remainder.Offset < input.Length)
{
Decode(message);
}
return(message.Data);
}
private static void Decode(RLPMessage msg)
{
var firstByte = Convert.ToInt16(msg.Remainder.Array[msg.Remainder.Offset]);
// single byte
if (firstByte <= 0x7f)
{
msg.Data.Add(new RLPItem(new[] { msg.Remainder.Array[msg.Remainder.Offset] }));
msg.Remainder = msg.Remainder.Slice(1);
return;
}
// string 0-55 bytes
if (firstByte <= 0xb7)
{
var itemLength = Math.Abs(128 - firstByte);
var data = firstByte == 0x80 ? new ArraySegment <byte>(new byte[0]) : msg.Remainder.Slice(1, itemLength);
msg.Data.Add(new RLPItem(data.ToArray()));
msg.Remainder = msg.Remainder.Slice(data.Count + 1);
return;
}
// string 56-255 bytes
if (firstByte <= 0xbf)
{
var listLength = Math.Abs(183 - firstByte);
var itemLength = Convert.ToInt16(msg.Remainder.Array[msg.Remainder.Offset + 1]);
var data = msg.Remainder.Slice(listLength + 1, itemLength);
msg.Data.Add(new RLPItem(data.ToArray()));
msg.Remainder = msg.Remainder.Slice(data.Offset + data.Count);
return;
}
// collection 0-55 bytes
if (firstByte <= 0xf7)
{
var itemLength = Math.Abs(192 - firstByte);
var data = msg.Remainder.Slice(1, itemLength).ToArray();
while (msg.Remainder.Offset < msg.Remainder.Array.Length)
{
var decoded = Decode(data);
msg.Data.AddRange(decoded);
msg.Remainder = msg.Remainder.Slice(msg.Remainder.Count);
}
return;
}
// collection 56-255 bytes
if (firstByte <= 0xff)
{
var listLength = Math.Abs(247 - firstByte);
var itemLength = Convert.ToInt16(msg.Remainder.Array[msg.Remainder.Offset + 1]);
var data = msg.Remainder.Slice(listLength + 1, itemLength).ToArray();
while (msg.Remainder.Offset < msg.Remainder.Array.Length)
{
var decoded = Decode(data);
msg.Data.AddRange(decoded);
msg.Remainder = msg.Remainder.Slice(msg.Remainder.Count);
}
return;
}
throw new ArgumentOutOfRangeException("msg", "msg is too long");
}
private static void Decode(RLPMessage msg)
{
var firstByte = Convert.ToInt16(msg.Remainder.Array[msg.Remainder.Offset]);
// single byte
if (firstByte <= 0x7f)
{
msg.Decoded.Add(firstByte.ToString(CultureInfo.InvariantCulture));
msg.Remainder = msg.Remainder.Slice(1);
return;
}
// string <55 bytes
if (firstByte <= 0xb7)
{
var itemLength = Math.Abs(128 - firstByte);
var data = firstByte == 0x80 ? new ArraySegment <byte>(new byte[0]) : msg.Remainder.Slice(1, itemLength);
msg.Decoded.Add(System.Text.Encoding.ASCII.GetString(data.Array, data.Offset, data.Count));
msg.Remainder = msg.Remainder.Slice(data.Count + 1);
return;
}
// string >55 bytes
if (firstByte <= 0xbf)
{
var listLength = Math.Abs(183 - firstByte);
var itemLength = Convert.ToInt16(msg.Remainder.Array[msg.Remainder.Offset + 1]);
var data = msg.Remainder.Slice(listLength + 1, itemLength);
msg.Decoded.Add(System.Text.Encoding.ASCII.GetString(msg.Remainder.Array, data.Offset, data.Count));
msg.Remainder = msg.Remainder.Slice(data.Offset + data.Count);
return;
}
// collection <55 bytes
if (firstByte <= 0xf7)
{
var itemLength = Math.Abs(192 - firstByte);
var data = msg.Remainder.Slice(1, itemLength).ToArray();
while (msg.Remainder.Offset < msg.Remainder.Array.Length)
{
var decoded = Decode(data);
msg.Decoded.AddRange(decoded);
msg.Remainder = msg.Remainder.Slice(msg.Remainder.Count);
}
return;
}
// collection >55 bytes
if (firstByte <= 0xff)
{
var listLength = Math.Abs(247 - firstByte);
var itemLength = Convert.ToInt16(msg.Remainder.Array[msg.Remainder.Offset + 1]);
var data = msg.Remainder.Slice(listLength + 1, itemLength).ToArray();
while (msg.Remainder.Offset < msg.Remainder.Array.Length)
{
var decoded = Decode(data);
msg.Decoded.AddRange(decoded);
msg.Remainder = msg.Remainder.Slice(msg.Remainder.Count);
}
return;
}
throw new ArgumentOutOfRangeException("msg", "msg is too long");
}