ByteBuf() — netty Function Reference

Source Code

codec-classes-quic/src/main/java/io/netty/handler/codec/quic/QuicHeaderParser.java lines 154–176

    private static ByteBuf sliceToken(QuicPacketType type, ByteBuf packet, int offset, int readable)
            throws QuicException {
        switch (type) {
            case INITIAL:
                // See
                checkReadable(offset, readable, Byte.BYTES);
                int numBytes = numBytesForVariableLengthInteger(packet.getByte(offset));
                int len = (int) getVariableLengthInteger(packet, offset, numBytes);
                offset += numBytes;

                checkReadable(offset, readable, len);
                return packet.slice(offset, len);
            case RETRY:
                // Exclude the integrity tag from the token.
                // See https://www.rfc-editor.org/rfc/rfc9000.html#section-17.2.5
                checkReadable(offset, readable, AES_128_GCM_TAG_LENGTH);
                int tokenLen = readable - offset - AES_128_GCM_TAG_LENGTH;
                return packet.slice(offset, tokenLen);
            default:
                // No token included.
                return Unpooled.EMPTY_BUFFER;
        }
    }