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