forked from quic-go/quic-go
f12ee48617
* wire: add benchmarks for the frame parser * wire: use quicvarint.Parse when parsing frames * wire: always use io.EOF for too short frames
76 lines
2.0 KiB
Go
76 lines
2.0 KiB
Go
package wire
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import (
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"io"
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"github.com/quic-go/quic-go/internal/protocol"
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"github.com/quic-go/quic-go/quicvarint"
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)
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// A ConnectionCloseFrame is a CONNECTION_CLOSE frame
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type ConnectionCloseFrame struct {
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IsApplicationError bool
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ErrorCode uint64
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FrameType uint64
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ReasonPhrase string
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}
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func parseConnectionCloseFrame(b []byte, typ uint64, _ protocol.Version) (*ConnectionCloseFrame, int, error) {
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startLen := len(b)
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f := &ConnectionCloseFrame{IsApplicationError: typ == applicationCloseFrameType}
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ec, l, err := quicvarint.Parse(b)
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if err != nil {
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return nil, 0, replaceUnexpectedEOF(err)
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}
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b = b[l:]
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f.ErrorCode = ec
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// read the Frame Type, if this is not an application error
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if !f.IsApplicationError {
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ft, l, err := quicvarint.Parse(b)
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if err != nil {
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return nil, 0, replaceUnexpectedEOF(err)
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}
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b = b[l:]
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f.FrameType = ft
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}
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var reasonPhraseLen uint64
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reasonPhraseLen, l, err = quicvarint.Parse(b)
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if err != nil {
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return nil, 0, replaceUnexpectedEOF(err)
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}
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b = b[l:]
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if int(reasonPhraseLen) > len(b) {
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return nil, 0, io.EOF
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}
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reasonPhrase := make([]byte, reasonPhraseLen)
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copy(reasonPhrase, b)
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f.ReasonPhrase = string(reasonPhrase)
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return f, startLen - len(b) + int(reasonPhraseLen), nil
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}
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// Length of a written frame
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func (f *ConnectionCloseFrame) Length(protocol.Version) protocol.ByteCount {
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length := 1 + protocol.ByteCount(quicvarint.Len(f.ErrorCode)+quicvarint.Len(uint64(len(f.ReasonPhrase)))) + protocol.ByteCount(len(f.ReasonPhrase))
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if !f.IsApplicationError {
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length += protocol.ByteCount(quicvarint.Len(f.FrameType)) // for the frame type
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}
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return length
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}
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func (f *ConnectionCloseFrame) Append(b []byte, _ protocol.Version) ([]byte, error) {
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if f.IsApplicationError {
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b = append(b, applicationCloseFrameType)
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} else {
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b = append(b, connectionCloseFrameType)
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}
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b = quicvarint.Append(b, f.ErrorCode)
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if !f.IsApplicationError {
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b = quicvarint.Append(b, f.FrameType)
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}
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b = quicvarint.Append(b, uint64(len(f.ReasonPhrase)))
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b = append(b, []byte(f.ReasonPhrase)...)
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return b, nil
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}
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