| /* |
| * Copyright 2017-present Open Networking Laboratory |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.onosproject.routing.fpm; |
| |
| import org.jboss.netty.buffer.ChannelBuffer; |
| import org.jboss.netty.channel.Channel; |
| import org.jboss.netty.channel.ChannelHandlerContext; |
| import org.jboss.netty.handler.codec.frame.FrameDecoder; |
| import org.onosproject.routing.fpm.protocol.FpmHeader; |
| |
| /** |
| * Frame decoder for FPM connections. |
| */ |
| public class FpmFrameDecoder extends FrameDecoder { |
| |
| @Override |
| protected Object decode(ChannelHandlerContext ctx, Channel channel, ChannelBuffer buffer) |
| throws Exception { |
| |
| if (!channel.isConnected()) { |
| return null; |
| } |
| |
| if (buffer.readableBytes() < FpmHeader.FPM_HEADER_LENGTH) { |
| return null; |
| } |
| |
| buffer.markReaderIndex(); |
| |
| short version = buffer.readUnsignedByte(); |
| short type = buffer.readUnsignedByte(); |
| int length = buffer.readUnsignedShort(); |
| |
| buffer.resetReaderIndex(); |
| |
| if (buffer.readableBytes() < length) { |
| // Not enough bytes to read a whole message |
| return null; |
| } |
| |
| byte[] fpmMessage = new byte[length]; |
| buffer.readBytes(fpmMessage); |
| |
| return FpmHeader.decode(fpmMessage, 0, fpmMessage.length); |
| } |
| } |