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
}