/// <summary>
/// |total size|header size|magic code| header | body |
/// </summary>
/// <param name="stream"></param>
/// <returns></returns>
public object Decode(InputStream stream)
{
if (!stream.CanRead)
{
return(Response.NeedMore);
}
long remain = stream.Length;
if (remain < RemotingHeader.MinHeaderSize + RemotingHeader.LengthFieldLen)
{
return(Response.NeedMore);
}
stream.MarkReaderIndex();
//go to magic code field
stream.Position = stream.Position + RemotingHeader.LengthFieldLen;
var buffer = new byte[4];
var magicCode = ByteBufHelper.ReadInt32(buffer, stream);
//go to head, length field
stream.ResetReaderIndex();
if (RemotingHeader.QmqMagicCode != magicCode)
{
throw new IOException("非法数据");
}
stream.MarkReaderIndex();
var total = ByteBufHelper.ReadInt32(buffer, stream);
//f**k this
if (remain - RemotingHeader.TotalSizeLen < total)
{
stream.ResetReaderIndex();
return(Response.NeedMore);
}
short headerSize = ByteBufHelper.ReadInt16(buffer, stream);
var header = DecodeHeader(buffer, stream);
int bodyLen = total - headerSize - RemotingHeader.HeaderSizeLen;
byte[] body = new byte[bodyLen];
stream.Read(body, 0, bodyLen);
var msg = new Datagram
{
Body = body,
Header = header
};
return(msg);
}
private RemotingHeader DecodeHeader(byte[] buffer, InputStream stream)
{
var header = new RemotingHeader();
//skip magic code
ByteBufHelper.ReadInt32(buffer, stream);
header.Code = ByteBufHelper.ReadInt16(buffer, stream);
header.Version = ByteBufHelper.ReadInt16(buffer, stream);
header.Opaque = ByteBufHelper.ReadInt32(buffer, stream);
header.Flag = ByteBufHelper.ReadInt32(buffer, stream);
header.RequestCode = ByteBufHelper.ReadInt16(buffer, stream);
return(header);
}