示例#1
0
func parseFlowRequest(r *xio.PacketReader) (*flowRequest, error) {
	var err error
	flags := uint8(0)
	if flags, err = r.Read8(); err != nil {
		return nil, errors.New("flow.read flags")
	}
	fid := uint64(0)
	if fid, err = r.Read7BitValue64(); err != nil {
		return nil, errors.New("flow.read fid")
	}
	stage, delta := uint64(0), uint64(0)
	if stage, err = r.Read7BitValue64(); err != nil {
		return nil, errors.New("flow.read stage")
	}
	if delta, err = r.Read7BitValue64(); err != nil {
		return nil, errors.New("flow.read delta")
	}
	signature := ""
	if (flags & flagsHeader) != 0 {
		if signature, err = r.ReadString8(); err != nil {
			return nil, errors.New("flow.read signature")
		}
		for {
			if size, err := r.Read8(); err != nil {
				return nil, errors.New("flow.read header content size")
			} else if size == 0 {
				break
			} else if n := int(size); n > r.Len() {
				return nil, errors.New("flows.too big header content size")
			} else if err = r.Skip(n); err != nil {
				return nil, errors.New("flows.skip header")
			}
		}
	}
	data := r.Bytes()
	req := &flowRequest{}
	req.fid = fid
	req.signature = signature
	req.stage = stage
	req.stageack = stage - delta
	req.slices = make([]*flowRequestSlice, 0, 4)
	req.AddSlice(&flowRequestSlice{flags, data})
	return req, nil
}