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max_streams_frame.go
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/
max_streams_frame.go
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package wire
import (
"bytes"
"fmt"
"github.com/fkwhite/quic-go/internal/protocol"
"github.com/fkwhite/quic-go/quicvarint"
)
// A MaxStreamsFrame is a MAX_STREAMS frame
type MaxStreamsFrame struct {
Type protocol.StreamType
MaxStreamNum protocol.StreamNum
}
func parseMaxStreamsFrame(r *bytes.Reader, _ protocol.VersionNumber) (*MaxStreamsFrame, error) {
typeByte, err := r.ReadByte()
if err != nil {
return nil, err
}
f := &MaxStreamsFrame{}
switch typeByte {
case 0x12:
f.Type = protocol.StreamTypeBidi
case 0x13:
f.Type = protocol.StreamTypeUni
}
streamID, err := quicvarint.Read(r)
if err != nil {
return nil, err
}
f.MaxStreamNum = protocol.StreamNum(streamID)
if f.MaxStreamNum > protocol.MaxStreamCount {
return nil, fmt.Errorf("%d exceeds the maximum stream count", f.MaxStreamNum)
}
return f, nil
}
func (f *MaxStreamsFrame) Append(b []byte, _ protocol.VersionNumber) ([]byte, error) {
switch f.Type {
case protocol.StreamTypeBidi:
b = append(b, 0x12)
case protocol.StreamTypeUni:
b = append(b, 0x13)
}
b = quicvarint.Append(b, uint64(f.MaxStreamNum))
return b, nil
}
// Length of a written frame
func (f *MaxStreamsFrame) Length(protocol.VersionNumber) protocol.ByteCount {
return 1 + quicvarint.Len(uint64(f.MaxStreamNum))
}