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package wire
import (
"errors"
"fmt"
"io"
"github.com/quic-go/quic-go/internal/protocol"
"github.com/quic-go/quic-go/quicvarint"
)
// A NewConnectionIDFrame is a NEW_CONNECTION_ID frame
type NewConnectionIDFrame struct {
SequenceNumber uint64
RetirePriorTo uint64
ConnectionID protocol.ConnectionID
StatelessResetToken protocol.StatelessResetToken
}
func parseNewConnectionIDFrame(b []byte, _ protocol.Version) (*NewConnectionIDFrame, int, error) {
startLen := len(b)
seq, l, err := quicvarint.Parse(b)
if err != nil {
return nil, 0, replaceUnexpectedEOF(err)
}
b = b[l:]
ret, l, err := quicvarint.Parse(b)
if err != nil {
return nil, 0, replaceUnexpectedEOF(err)
}
b = b[l:]
if ret > seq {
//nolint:staticcheck // SA1021: Retire Prior To is the name of the field
return nil, 0, fmt.Errorf("Retire Prior To value (%d) larger than Sequence Number (%d)", ret, seq)
}
if len(b) == 0 {
return nil, 0, io.EOF
}
connIDLen := int(b[0])
b = b[1:]
if connIDLen == 0 {
return nil, 0, errors.New("invalid zero-length connection ID")
}
if connIDLen > protocol.MaxConnIDLen {
return nil, 0, protocol.ErrInvalidConnectionIDLen
}
if len(b) < connIDLen {
return nil, 0, io.EOF
}
frame := &NewConnectionIDFrame{
SequenceNumber: seq,
RetirePriorTo: ret,
ConnectionID: protocol.ParseConnectionID(b[:connIDLen]),
}
b = b[connIDLen:]
if len(b) < len(frame.StatelessResetToken) {
return nil, 0, io.EOF
}
copy(frame.StatelessResetToken[:], b)
return frame, startLen - len(b) + len(frame.StatelessResetToken), nil
}
func (f *NewConnectionIDFrame) Append(b []byte, _ protocol.Version) ([]byte, error) {
b = append(b, byte(FrameTypeNewConnectionID))
b = quicvarint.Append(b, f.SequenceNumber)
b = quicvarint.Append(b, f.RetirePriorTo)
connIDLen := f.ConnectionID.Len()
if connIDLen > protocol.MaxConnIDLen {
return nil, fmt.Errorf("invalid connection ID length: %d", connIDLen)
}
b = append(b, uint8(connIDLen))
b = append(b, f.ConnectionID.Bytes()...)
b = append(b, f.StatelessResetToken[:]...)
return b, nil
}
// Length of a written frame
func (f *NewConnectionIDFrame) Length(protocol.Version) protocol.ByteCount {
return 1 + protocol.ByteCount(quicvarint.Len(f.SequenceNumber)+quicvarint.Len(f.RetirePriorTo)+1 /* connection ID length */ +f.ConnectionID.Len()) + 16
}
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