90 lines
2.4 KiB
Go
90 lines
2.4 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 RstStreamFrame is a RST_STREAM frame in QUIC
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type RstStreamFrame struct {
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StreamID protocol.StreamID
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// The error code is a uint32 in gQUIC, but a uint16 in IETF QUIC.
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// protocol.ApplicaitonErrorCode is a uint16, so larger values in gQUIC frames will be truncated.
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ErrorCode protocol.ApplicationErrorCode
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ByteOffset protocol.ByteCount
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}
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// ParseRstStreamFrame parses a RST_STREAM frame
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func ParseRstStreamFrame(r *bytes.Reader, version protocol.VersionNumber) (*RstStreamFrame, error) {
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if _, err := r.ReadByte(); err != nil { // read the TypeByte
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return nil, err
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}
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var streamID protocol.StreamID
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var errorCode uint16
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var byteOffset protocol.ByteCount
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if version.UsesIETFFrameFormat() {
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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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streamID = protocol.StreamID(sid)
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errorCode, err = utils.BigEndian.ReadUint16(r)
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if err != nil {
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return nil, err
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}
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bo, 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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byteOffset = protocol.ByteCount(bo)
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} else {
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sid, err := utils.BigEndian.ReadUint32(r)
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if err != nil {
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return nil, err
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}
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streamID = protocol.StreamID(sid)
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bo, err := utils.BigEndian.ReadUint64(r)
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if err != nil {
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return nil, err
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}
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byteOffset = protocol.ByteCount(bo)
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ec, err := utils.BigEndian.ReadUint32(r)
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if err != nil {
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return nil, err
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}
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errorCode = uint16(ec)
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}
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return &RstStreamFrame{
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StreamID: streamID,
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ErrorCode: protocol.ApplicationErrorCode(errorCode),
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ByteOffset: byteOffset,
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}, nil
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}
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//Write writes a RST_STREAM frame
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func (f *RstStreamFrame) Write(b *bytes.Buffer, version protocol.VersionNumber) error {
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b.WriteByte(0x01)
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if version.UsesIETFFrameFormat() {
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utils.WriteVarInt(b, uint64(f.StreamID))
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utils.BigEndian.WriteUint16(b, uint16(f.ErrorCode))
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utils.WriteVarInt(b, uint64(f.ByteOffset))
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} else {
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utils.BigEndian.WriteUint32(b, uint32(f.StreamID))
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utils.BigEndian.WriteUint64(b, uint64(f.ByteOffset))
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utils.BigEndian.WriteUint32(b, uint32(f.ErrorCode))
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}
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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 *RstStreamFrame) MinLength(version protocol.VersionNumber) protocol.ByteCount {
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if version.UsesIETFFrameFormat() {
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return 1 + utils.VarIntLen(uint64(f.StreamID)) + 2 + utils.VarIntLen(uint64(f.ByteOffset))
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}
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return 1 + 4 + 8 + 4
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}
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