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/*
* Copyright 2015 Anton Tananaev (anton.tananaev@gmail.com)
*
* 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.traccar.protocol;
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.traccar.helper.StringFinder;
import java.nio.charset.StandardCharsets;
public class MegastekFrameDecoder extends FrameDecoder {
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf) throws Exception {
if (buf.readableBytes() < 10) {
return null;
}
if (Character.isDigit(buf.getByte(buf.readerIndex()))) {
int length = 4 + Integer.parseInt(buf.toString(buf.readerIndex(), 4, StandardCharsets.US_ASCII));
if (buf.readableBytes() >= length) {
return buf.readBytes(length);
}
} else {
int delimiter = buf.indexOf(buf.readerIndex(), buf.writerIndex(), new StringFinder("\r\n"));
if (delimiter != -1) {
ChannelBuffer result = buf.readBytes(delimiter - buf.readerIndex());
buf.skipBytes(2);
return result;
}
}
return null;
}
}
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