public unsafe IList <ArraySegment <byte> > CreateBuffer(IList <ArraySegment <byte> > appendTo = null)
{
// key size
var keyData = BinaryConverter.EncodeKey(this.Key);
var keyLength = keyData == null ? 0 : keyData.Length;
if (keyLength > 0xffff)
{
throw new InvalidOperationException("KeyTooLong");
}
// extra size
var extras = this.Extra;
var extraLength = extras.Array == null ? 0 : extras.Count;
if (extraLength > 0xff)
{
throw new InvalidOperationException("ExtraTooLong");
}
// body size
var body = this.Data;
var bodyLength = body.Array == null ? 0 : body.Count;
// total payload size
var totalLength = extraLength + keyLength + bodyLength;
//build the header
var header = new byte[24];
fixed(byte *buffer = header)
{
buffer[0x00] = 0x80; // magic
buffer[0x01] = this.Operation;
// key length
buffer[0x02] = (byte)(keyLength >> 8);
buffer[0x03] = (byte)(keyLength & 255);
// extra length
buffer[0x04] = (byte)(extraLength);
// 5 -- data type, 0 (RAW)
// 6,7 -- reserved, always 0
buffer[0x06] = (byte)(this.Reserved >> 8);
buffer[0x07] = (byte)(this.Reserved & 255);
// body length
buffer[0x08] = (byte)(totalLength >> 24);
buffer[0x09] = (byte)(totalLength >> 16);
buffer[0x0a] = (byte)(totalLength >> 8);
buffer[0x0b] = (byte)(totalLength & 255);
buffer[0x0c] = (byte)(this.CorrelationID >> 24);
buffer[0x0d] = (byte)(this.CorrelationID >> 16);
buffer[0x0e] = (byte)(this.CorrelationID >> 8);
buffer[0x0f] = (byte)(this.CorrelationID & 255);
// CAS
ulong cas = this.Cas;
if (cas > 0)
{
// skip this if no cas is specfied
buffer[0x10] = (byte)(cas >> 56);
buffer[0x11] = (byte)(cas >> 48);
buffer[0x12] = (byte)(cas >> 40);
buffer[0x13] = (byte)(cas >> 32);
buffer[0x14] = (byte)(cas >> 24);
buffer[0x15] = (byte)(cas >> 16);
buffer[0x16] = (byte)(cas >> 8);
buffer[0x17] = (byte)(cas & 255);
}
}
var result = appendTo ?? new List <ArraySegment <byte> >(4);
result.Add(new ArraySegment <byte>(header));
if (extraLength > 0)
{
result.Add(extras);
}
// key must be already encoded and should not contain any invalid characters which are not allowed by the protocol
if (keyLength > 0)
{
result.Add(new ArraySegment <byte>(keyData));
}
if (bodyLength > 0)
{
result.Add(body);
}
return(result);
}
