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/*
* Copyright 2013 - 2016 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;
public class H02FrameDecoder extends FrameDecoder {
private static final int MESSAGE_SHORT = 32;
private static final int MESSAGE_LONG = 45;
private int messageLength;
public H02FrameDecoder(int messageLength) {
this.messageLength = messageLength;
}
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf) throws Exception {
char marker = (char) buf.getByte(buf.readerIndex());
while (marker != '*' && marker != '$' && buf.readableBytes() > 0) {
buf.skipBytes(1);
if (buf.readableBytes() > 0) {
marker = (char) buf.getByte(buf.readerIndex());
}
}
if (marker == '*') {
// Return text message
int index = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '#');
if (index != -1) {
return buf.readBytes(index + 1 - buf.readerIndex());
}
} else if (marker == '$') {
if (messageLength > 0 && buf.readableBytes() >= messageLength) {
return buf.readBytes(messageLength);
} else if (buf.readableBytes() >= MESSAGE_SHORT) {
if (buf.getUnsignedByte(buf.readerIndex() + MESSAGE_SHORT - 1) == 0) {
return buf.readBytes(MESSAGE_SHORT);
} else if (buf.readableBytes() >= MESSAGE_LONG) {
return buf.readBytes(MESSAGE_LONG);
}
}
}
return null;
}
}
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