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