forked from quic-go/quic-go
/
max_stream_data_frame.go
60 lines (51 loc) · 1.59 KB
/
max_stream_data_frame.go
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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 MaxStreamDataFrame carries flow control information for a stream
type MaxStreamDataFrame struct {
StreamID protocol.StreamID
ByteOffset protocol.ByteCount
}
// parseMaxStreamDataFrame parses a MAX_STREAM_DATA frame
func parseMaxStreamDataFrame(r *bytes.Reader, version protocol.VersionNumber) (*MaxStreamDataFrame, error) {
frame := &MaxStreamDataFrame{}
// read the TypeByte
if _, err := r.ReadByte(); err != nil {
return nil, err
}
sid, err := utils.ReadVarInt(r)
if err != nil {
return nil, err
}
frame.StreamID = protocol.StreamID(sid)
byteOffset, err := utils.ReadVarInt(r)
if err != nil {
return nil, err
}
frame.ByteOffset = protocol.ByteCount(byteOffset)
return frame, nil
}
// Write writes a MAX_STREAM_DATA frame
func (f *MaxStreamDataFrame) Write(b *bytes.Buffer, version protocol.VersionNumber) error {
if !version.UsesIETFFrameFormat() {
return (&windowUpdateFrame{
StreamID: f.StreamID,
ByteOffset: f.ByteOffset,
}).Write(b, version)
}
b.WriteByte(0x5)
utils.WriteVarInt(b, uint64(f.StreamID))
utils.WriteVarInt(b, uint64(f.ByteOffset))
return nil
}
// Length of a written frame
func (f *MaxStreamDataFrame) Length(version protocol.VersionNumber) protocol.ByteCount {
// writing this frame would result in a gQUIC WINDOW_UPDATE being written, which has a different length
if !version.UsesIETFFrameFormat() {
return 1 + 4 + 8
}
return 1 + utils.VarIntLen(uint64(f.StreamID)) + utils.VarIntLen(uint64(f.ByteOffset))
}