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/*
* Copyright 2014 - 2018 Anton Tananaev (anton@traccar.org)
*
* 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 io.netty.buffer.ByteBuf;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import org.traccar.BaseFrameDecoder;
public class Gt06FrameDecoder extends BaseFrameDecoder {
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
if (buf.readableBytes() < 5) {
return null;
}
int length = 2 + 2; // head and tail
if (buf.getByte(buf.readerIndex()) == 0x78) {
length += 1 + buf.getUnsignedByte(buf.readerIndex() + 2);
} else {
length += 2 + buf.getUnsignedShort(buf.readerIndex() + 2);
}
if (buf.readableBytes() >= length && buf.getUnsignedShort(buf.readerIndex() + length - 2) == 0x0d0a) {
return buf.readRetainedSlice(length);
}
int endIndex = buf.readerIndex() - 1;
do {
endIndex = buf.indexOf(endIndex + 1, buf.writerIndex(), (byte) 0x0d);
if (endIndex > 0 && buf.writerIndex() > endIndex + 1 && buf.getByte(endIndex + 1) == 0x0a) {
return buf.readRetainedSlice(endIndex + 2 - buf.readerIndex());
}
} while (endIndex > 0);
return null;
}
}
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