52 lines
1.4 KiB
Go
52 lines
1.4 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 MaxDataFrame carries flow control information for the connection
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type MaxDataFrame struct {
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ByteOffset protocol.ByteCount
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}
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// ParseMaxDataFrame parses a MAX_DATA frame
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func ParseMaxDataFrame(r *bytes.Reader, version protocol.VersionNumber) (*MaxDataFrame, error) {
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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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frame := &MaxDataFrame{}
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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 *MaxDataFrame) Write(b *bytes.Buffer, version protocol.VersionNumber) error {
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if !version.UsesIETFFrameFormat() {
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// write a gQUIC WINDOW_UPDATE frame (with stream ID 0, which means connection-level there)
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return (&windowUpdateFrame{
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StreamID: 0,
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ByteOffset: f.ByteOffset,
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}).Write(b, version)
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}
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b.WriteByte(0x4)
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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 *MaxDataFrame) MinLength(version protocol.VersionNumber) protocol.ByteCount {
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if !version.UsesIETFFrameFormat() { // writing this frame would result in a gQUIC WINDOW_UPDATE being written, which is longer
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return 1 + 4 + 8
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}
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return 1 + utils.VarIntLen(uint64(f.ByteOffset))
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}
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