61 lines
1.6 KiB
Go
61 lines
1.6 KiB
Go
package wire
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import (
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"bytes"
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"github.com/lucas-clemente/quic-go/internal/protocol"
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"github.com/lucas-clemente/quic-go/internal/utils"
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)
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// A MaxStreamDataFrame carries flow control information for a stream
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type MaxStreamDataFrame struct {
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StreamID protocol.StreamID
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ByteOffset protocol.ByteCount
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}
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// ParseMaxStreamDataFrame parses a MAX_STREAM_DATA frame
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func ParseMaxStreamDataFrame(r *bytes.Reader, version protocol.VersionNumber) (*MaxStreamDataFrame, error) {
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frame := &MaxStreamDataFrame{}
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// read the TypeByte
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if _, err := r.ReadByte(); err != nil {
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return nil, err
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}
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sid, err := utils.ReadVarInt(r)
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if err != nil {
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return nil, err
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}
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frame.StreamID = protocol.StreamID(sid)
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byteOffset, err := utils.ReadVarInt(r)
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if err != nil {
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return nil, err
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}
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frame.ByteOffset = protocol.ByteCount(byteOffset)
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return frame, nil
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}
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// Write writes a MAX_STREAM_DATA frame
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func (f *MaxStreamDataFrame) Write(b *bytes.Buffer, version protocol.VersionNumber) error {
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if !version.UsesIETFFrameFormat() {
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return (&windowUpdateFrame{
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StreamID: f.StreamID,
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ByteOffset: f.ByteOffset,
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}).Write(b, version)
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}
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b.WriteByte(0x5)
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utils.WriteVarInt(b, uint64(f.StreamID))
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utils.WriteVarInt(b, uint64(f.ByteOffset))
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return nil
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}
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// MinLength of a written frame
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func (f *MaxStreamDataFrame) MinLength(version protocol.VersionNumber) protocol.ByteCount {
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// writing this frame would result in a gQUIC WINDOW_UPDATE being written, which has a different length
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if !version.UsesIETFFrameFormat() {
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return 1 + 4 + 8
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}
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return 1 + utils.VarIntLen(uint64(f.StreamID)) + utils.VarIntLen(uint64(f.ByteOffset))
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}
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