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frame_parser.go
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frame_parser.go
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package wire
import (
"bytes"
"errors"
"fmt"
"github.com/lucas-clemente/quic-go/internal/protocol"
"github.com/lucas-clemente/quic-go/qerr"
)
// ParseNextFrame parses the next frame
// It skips PADDING frames.
func ParseNextFrame(r *bytes.Reader, hdr *Header, v protocol.VersionNumber) (Frame, error) {
for r.Len() != 0 {
typeByte, _ := r.ReadByte()
if typeByte == 0x0 { // PADDING frame
continue
}
r.UnreadByte()
if !v.UsesIETFFrameFormat() {
return parseGQUICFrame(r, typeByte, hdr, v)
}
return parseIETFFrame(r, typeByte, v)
}
return nil, nil
}
func parseIETFFrame(r *bytes.Reader, typeByte byte, v protocol.VersionNumber) (Frame, error) {
var frame Frame
var err error
if typeByte&0xf8 == 0x10 {
frame, err = parseStreamFrame(r, v)
if err != nil {
err = qerr.Error(qerr.InvalidStreamData, err.Error())
}
return frame, err
}
// TODO: implement all IETF QUIC frame types
switch typeByte {
case 0x1:
frame, err = parseRstStreamFrame(r, v)
if err != nil {
err = qerr.Error(qerr.InvalidRstStreamData, err.Error())
}
case 0x2:
frame, err = parseConnectionCloseFrame(r, v)
if err != nil {
err = qerr.Error(qerr.InvalidConnectionCloseData, err.Error())
}
case 0x4:
frame, err = parseMaxDataFrame(r, v)
if err != nil {
err = qerr.Error(qerr.InvalidWindowUpdateData, err.Error())
}
case 0x5:
frame, err = parseMaxStreamDataFrame(r, v)
if err != nil {
err = qerr.Error(qerr.InvalidWindowUpdateData, err.Error())
}
case 0x6:
frame, err = parseMaxStreamIDFrame(r, v)
if err != nil {
err = qerr.Error(qerr.InvalidFrameData, err.Error())
}
case 0x7:
frame, err = parsePingFrame(r, v)
case 0x8:
frame, err = parseBlockedFrame(r, v)
if err != nil {
err = qerr.Error(qerr.InvalidBlockedData, err.Error())
}
case 0x9:
frame, err = parseStreamBlockedFrame(r, v)
if err != nil {
err = qerr.Error(qerr.InvalidBlockedData, err.Error())
}
case 0xa:
frame, err = parseStreamIDBlockedFrame(r, v)
if err != nil {
err = qerr.Error(qerr.InvalidFrameData, err.Error())
}
case 0xc:
frame, err = parseStopSendingFrame(r, v)
if err != nil {
err = qerr.Error(qerr.InvalidFrameData, err.Error())
}
case 0xe:
frame, err = parsePathChallengeFrame(r, v)
if err != nil {
err = qerr.Error(qerr.InvalidFrameData, err.Error())
}
case 0xf:
frame, err = parsePathResponseFrame(r, v)
if err != nil {
err = qerr.Error(qerr.InvalidFrameData, err.Error())
}
case 0x1a, 0x1b:
frame, err = parseAckFrame(r, v)
if err != nil {
err = qerr.Error(qerr.InvalidAckData, err.Error())
}
default:
err = qerr.Error(qerr.InvalidFrameData, fmt.Sprintf("unknown type byte 0x%x", typeByte))
}
return frame, err
}
func parseGQUICFrame(r *bytes.Reader, typeByte byte, hdr *Header, v protocol.VersionNumber) (Frame, error) {
var frame Frame
var err error
if typeByte&0x80 == 0x80 {
frame, err = parseStreamFrame(r, v)
if err != nil {
err = qerr.Error(qerr.InvalidStreamData, err.Error())
}
return frame, err
} else if typeByte&0xc0 == 0x40 {
frame, err = parseAckFrame(r, v)
if err != nil {
err = qerr.Error(qerr.InvalidAckData, err.Error())
}
return frame, err
}
switch typeByte {
case 0x1:
frame, err = parseRstStreamFrame(r, v)
if err != nil {
err = qerr.Error(qerr.InvalidRstStreamData, err.Error())
}
case 0x2:
frame, err = parseConnectionCloseFrame(r, v)
if err != nil {
err = qerr.Error(qerr.InvalidConnectionCloseData, err.Error())
}
case 0x3:
frame, err = parseGoawayFrame(r, v)
if err != nil {
err = qerr.Error(qerr.InvalidGoawayData, err.Error())
}
case 0x4:
frame, err = parseWindowUpdateFrame(r, v)
if err != nil {
err = qerr.Error(qerr.InvalidWindowUpdateData, err.Error())
}
case 0x5:
frame, err = parseBlockedFrameLegacy(r, v)
if err != nil {
err = qerr.Error(qerr.InvalidBlockedData, err.Error())
}
case 0x6:
if !v.UsesStopWaitingFrames() {
err = errors.New("STOP_WAITING frames not supported by this QUIC version")
break
}
frame, err = parseStopWaitingFrame(r, hdr.PacketNumber, hdr.PacketNumberLen, v)
if err != nil {
err = qerr.Error(qerr.InvalidStopWaitingData, err.Error())
}
case 0x7:
frame, err = parsePingFrame(r, v)
default:
err = qerr.Error(qerr.InvalidFrameData, fmt.Sprintf("unknown type byte 0x%x", typeByte))
}
return frame, err
}