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package wire
import (
"bytes"
"github.com/lucas-clemente/quic-go/internal/protocol"
"github.com/lucas-clemente/quic-go/internal/utils"
)
// 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 := utils.ReadVarInt(r)
if err != nil {
return nil, err
}
f.MaxStreamNum = protocol.StreamNum(streamID)
return f, nil
}
func (f *MaxStreamsFrame) Write(b *bytes.Buffer, _ protocol.VersionNumber) error {
switch f.Type {
case protocol.StreamTypeBidi:
b.WriteByte(0x12)
case protocol.StreamTypeUni:
b.WriteByte(0x13)
}
utils.WriteVarInt(b, uint64(f.MaxStreamNum))
return nil
}
// Length of a written frame
func (f *MaxStreamsFrame) Length(protocol.VersionNumber) protocol.ByteCount {
return 1 + utils.VarIntLen(uint64(f.MaxStreamNum))
}
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