public unsafe IList <ArraySegment <byte> > CreateBuffer(IList <ArraySegment <byte> > appendTo)
{
// key size
byte[] keyData = BinaryConverter.EncodeKey(this.Key);
int keyLength = keyData == null ? 0 : keyData.Length;
if (keyLength > 0xffff)
{
throw new InvalidOperationException("KeyTooLong");
}
// extra size
ArraySegment <byte> extras = this.Extra;
int extraLength = extras.Array == null ? 0 : extras.Count;
if (extraLength > 0xff)
{
throw new InvalidOperationException("ExtraTooLong");
}
// body size
ArraySegment <byte> body = this.Data;
int bodyLength = body.Array == null ? 0 : body.Count;
// total payload size
int totalLength = extraLength + keyLength + bodyLength;
//build the header
byte[] 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);
ulong cas = this.Cas;
// 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 retval = appendTo ?? new List <ArraySegment <byte> >(4);
retval.Add(new ArraySegment <byte>(header));
if (extraLength > 0)
{
retval.Add(extras);
}
// NOTE key must be already encoded and should not contain any invalid characters which are not allowed by the protocol
if (keyLength > 0)
{
retval.Add(new ArraySegment <byte>(keyData));
}
if (bodyLength > 0)
{
retval.Add(body);
}
#if DEBUG_PROTOCOL
if (log.IsDebugEnabled)
{
log.Debug("Building binary request");
StringBuilder sb = new StringBuilder(128).AppendLine();
for (int i = 0; i < header.Length; i++)
{
byte value = header[i];
sb.Append(value < 16 ? "0x0" : "0x").Append(value.ToString("X"));
if (i % 4 == 3)
{
sb.AppendLine();
}
else
{
sb.Append(" ");
}
}
log.Debug(sb.ToString());
}
#endif
return(retval);
}