/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search licenses this
* file to you 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.elasticsearch.transport.netty;
import org.elasticsearch.common.netty.buffer.ChannelBuffer;
import org.elasticsearch.common.netty.channel.Channel;
import org.elasticsearch.common.netty.channel.ChannelHandlerContext;
import org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder;
import java.io.StreamCorruptedException;
/**
* @author kimchy (shay.banon)
*/
public class SizeHeaderFrameDecoder extends FrameDecoder {
protected Object decode(ChannelHandlerContext ctx, Channel channel, ChannelBuffer buffer) throws Exception {
if (buffer.readableBytes() < 4) {
return null;
}
int dataLen = buffer.getInt(buffer.readerIndex());
if (dataLen <= 0) {
throw new StreamCorruptedException("invalid data length: " + dataLen);
}
if (buffer.readableBytes() < dataLen + 4) {
return null;
}
buffer.skipBytes(4);
return buffer;
}
}