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package wire
import (
"fmt"
"github.com/quic-go/quic-go/internal/protocol"
"github.com/quic-go/quic-go/quicvarint"
)
// A MaxStreamsFrame is a MAX_STREAMS frame
type MaxStreamsFrame struct {
Type protocol.StreamType
MaxStreamNum protocol.StreamNum
}
func parseMaxStreamsFrame(b []byte, typ FrameType, _ protocol.Version) (*MaxStreamsFrame, int, error) {
f := &MaxStreamsFrame{}
//nolint:exhaustive // Function will only be called with BidiMaxStreamsFrameType or UniMaxStreamsFrameType
switch typ {
case FrameTypeBidiMaxStreams:
f.Type = protocol.StreamTypeBidi
case FrameTypeUniMaxStreams:
f.Type = protocol.StreamTypeUni
}
streamID, l, err := quicvarint.Parse(b)
if err != nil {
return nil, 0, replaceUnexpectedEOF(err)
}
f.MaxStreamNum = protocol.StreamNum(streamID)
if f.MaxStreamNum > protocol.MaxStreamCount {
return nil, 0, fmt.Errorf("%d exceeds the maximum stream count", f.MaxStreamNum)
}
return f, l, nil
}
func (f *MaxStreamsFrame) Append(b []byte, _ protocol.Version) ([]byte, error) {
switch f.Type {
case protocol.StreamTypeBidi:
b = append(b, byte(FrameTypeBidiMaxStreams))
case protocol.StreamTypeUni:
b = append(b, byte(FrameTypeUniMaxStreams))
}
b = quicvarint.Append(b, uint64(f.MaxStreamNum))
return b, nil
}
// Length of a written frame
func (f *MaxStreamsFrame) Length(protocol.Version) protocol.ByteCount {
return 1 + protocol.ByteCount(quicvarint.Len(uint64(f.MaxStreamNum)))
}
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