func parseFlowErrorRequest(r *xio.PacketReader) (*flowErrorRequest, error) {
var err error
fid := uint64(0)
if fid, err = r.Read7BitValue64(); err != nil {
return nil, errors.New("flowerror.read fid")
}
return &flowErrorRequest{fid}, nil
}
func parseFlowAckRequest(r *xio.PacketReader) (*flowAckRequest, error) {
var err error
fid := uint64(0)
if fid, err = r.Read7BitValue64(); err != nil {
return nil, errors.New("flowack.read fid")
}
cnt := uint64(0)
if cnt, err = r.Read7BitValue64(); err != nil {
return nil, errors.New("flowack.read cnt")
}
var ack *flowAck
if ack, err = parseFlowAck(r); err != nil {
return nil, errors.New("flowack.read ack")
}
return &flowAckRequest{fid, cnt, ack}, nil
}
func parseAssignRequest(r *xio.PacketReader) (*assignRequest, error) {
var err error
yid := uint32(0)
if yid, err = r.Read32(); err != nil {
return nil, errors.New("assign.read yid")
}
coolen := uint64(0)
if coolen, err = r.Read7BitValue64(); err != nil {
return nil, errors.New("assign.read cookie.len")
} else if coolen != cookies.CookieSize {
return nil, errors.New("assign.bad cookie.len")
}
coobuf := make([]byte, cookies.CookieSize)
if err = r.ReadBytes(coobuf); err != nil {
return nil, errors.New("assign.read cookie.value")
}
size := uint64(0)
if size, err = r.Read7BitValue64(); err != nil {
return nil, errors.New("assign.read pid.size")
} else if size == 0 || size > uint64(r.Len()) {
return nil, errors.New("assign.bad pid.size")
}
pid := sha256.Sum256(r.Bytes()[:size])
if len(pid) != 0x20 {
return nil, errors.New("assign.bad pid.len")
}
if size, err = r.Read7BitValue64(); err != nil {
return nil, errors.New("assign.read pubkey.len")
} else if size <= 2 {
return nil, errors.New("assign.too small pubkey.len")
} else {
size -= 2
if size > uint64(r.Len()) {
return nil, errors.New("assign.too big pubkey.len")
}
if err := r.Skip(2); err != nil {
return nil, errors.New("assign.skip useless")
}
}
pubkey := make([]byte, int(size))
if err = r.ReadBytes(pubkey); err != nil {
return nil, errors.New("assign.read pubkey")
}
if size, err = r.Read7BitValue64(); err != nil {
return nil, errors.New("assign.read initiator.len")
} else if size == 0 || size > uint64(r.Len()) {
return nil, errors.New("assign.bad initiator.len")
}
initiator := make([]byte, int(size))
if err = r.ReadBytes(initiator); err != nil {
return nil, errors.New("assign.read initiator")
}
return &assignRequest{yid, string(pid[:]), coobuf, pubkey, initiator}, nil
}
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
}
func parseFlowAck(r *xio.PacketReader) (*flowAck, error) {
if stage, err := r.Read7BitValue64(); err != nil {
return nil, err
} else {
ack := newFlowAck(stage)
var beg, end uint64
for r.Len() != 0 {
if beg, err = r.Read7BitValue64(); err != nil {
return nil, err
}
if end, err = r.Read7BitValue64(); err != nil {
return nil, err
}
beg = beg + stage + 2
end = end + beg
ack.AddRange(beg, end)
stage = end
}
return ack, nil
}
}