I am receiving a buffer and i want from it to create a new buffer ( concatenating bytes prefixed,infixed and postfixed) and send it later on to a socket.
Eg:
Initial buffer: "aaaa"
Final buffer: "$4\r\naaaa\r\n"
(Redis RESP Protocol - Bulk Strings)
How can i transform the span
to memory
? (I do not know if i should use stackalloc
given the fact that i do not know how big the input buffer
is.I figured it would be faster).
private static readonly byte[] RESP_BULK_ID =BitConverter.GetBytes('$');
private static readonly byte[] RESP_FOOTER = Encoding.UTF8.GetBytes("\r\n");
static Memory<byte> GetNodeSpan(in ReadOnlyMemory<byte> payload) {
ReadOnlySpan<byte> payloadHeader = BitConverter.GetBytes(payload.Length);
Span<byte> result = stackalloc byte[
RESP_BULK_ID.Length +
payloadHeader.Length +
RESP_FOOTER.Length +
payload.Length +
RESP_FOOTER.Length
];
Span<byte> cursor = result;
RESP_BULK_ID.CopyTo(cursor);
cursor=cursor.Slice(RESP_BULK_ID.Length);
payloadHeader.CopyTo(cursor);
cursor = cursor.Slice(payloadHeader.Length);
RESP_FOOTER.CopyTo(cursor);
cursor = cursor.Slice(RESP_FOOTER.Length);
payload.Span.CopyTo(cursor);
cursor = cursor.Slice(payload.Span.Length);
RESP_FOOTER.CopyTo(cursor);
return new Memory<byte>(result.AsBytes()) // ?can not convert from span to memory ,and cant return span because it can be referenced outside of scope
}
P.S : Should i use old-school for
loops instead of CopyTo
?