public static void WriteTo(AmfWriter writer, Snapshot previous, Snapshot next, int chunkLength, Space <byte> message)
{
Kon.Assert(
!previous.Ready || previous.ChunkStreamId == next.ChunkStreamId,
"previous and next describe two different chunk streams");
Kon.Assert(
next.MessageLength == message.Length,
"mismatch between reported message length and actual message length");
// we don't write zero-length packets, and as state for `next` and `previous` won't match what our peer
// sees if we pass a zero-length message here. zero-length sends should be filtered out at a higher level.
Kon.Assert(
next.MessageLength != 0,
"message length cannot be zero");
var header = GetInitialHeaderType();
for (var i = 0; i < next.MessageLength; i += chunkLength)
{
if (i == 0)
{
BasicHeader.WriteTo(writer, (byte)header, next.ChunkStreamId);
MessageHeader.WriteTo(writer, header, next);
}
else
{
BasicHeader.WriteTo(writer, (byte)MessageHeader.Type.Type3, next.ChunkStreamId);
}
var count = Math.Min(chunkLength, next.MessageLength - i);
var slice = message.Slice(i, count);
writer.WriteBytes(slice);
}
MessageHeader.Type GetInitialHeaderType()
{
if (!previous.Ready || next.MessageStreamId != previous.MessageStreamId)
{
return(MessageHeader.Type.Type0);
}
if (next.MessageLength != previous.MessageLength || next.ContentType != previous.ContentType)
{
return(MessageHeader.Type.Type1);
}
if (next.Timestamp != previous.Timestamp)
{
return(MessageHeader.Type.Type2);
}
return(MessageHeader.Type.Type3);
}
}
