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max_data_frame.go
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max_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 MaxDataFrame carries flow control information for the connection
type MaxDataFrame struct {
ByteOffset protocol.ByteCount
}
// parseMaxDataFrame parses a MAX_DATA frame
func parseMaxDataFrame(r *bytes.Reader, version protocol.VersionNumber) (*MaxDataFrame, error) {
// read the TypeByte
if _, err := r.ReadByte(); err != nil {
return nil, err
}
frame := &MaxDataFrame{}
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 *MaxDataFrame) Write(b *bytes.Buffer, version protocol.VersionNumber) error {
if !version.UsesIETFFrameFormat() {
// write a gQUIC WINDOW_UPDATE frame (with stream ID 0, which means connection-level there)
return (&windowUpdateFrame{
StreamID: 0,
ByteOffset: f.ByteOffset,
}).Write(b, version)
}
b.WriteByte(0x4)
utils.WriteVarInt(b, uint64(f.ByteOffset))
return nil
}
// Length of a written frame
func (f *MaxDataFrame) Length(version protocol.VersionNumber) protocol.ByteCount {
if !version.UsesIETFFrameFormat() { // writing this frame would result in a gQUIC WINDOW_UPDATE being written, which is longer
return 1 + 4 + 8
}
return 1 + utils.VarIntLen(uint64(f.ByteOffset))
}