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/*
* Copyright 2019 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 SuntechFrameDecoder extends BaseFrameDecoder {
private ByteBuf readFrame(ByteBuf buf, int delimiterIndex) {
ByteBuf frame = buf.readRetainedSlice(delimiterIndex - buf.readerIndex());
buf.skipBytes(1); // delimiter
return frame;
}
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
if (buf.getByte(buf.readerIndex() + 1) == 0) {
int length = 1 + 2 + buf.getShort(buf.readerIndex() + 1);
if (buf.readableBytes() >= length) {
return buf.readRetainedSlice(length);
}
} else {
int delimiterIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '\r');
while (delimiterIndex > 0) {
if (delimiterIndex + 1 < buf.writerIndex() && buf.getByte(delimiterIndex + 1) == '\n') {
delimiterIndex = buf.indexOf(delimiterIndex + 1, buf.writerIndex(), (byte) '\r');
} else {
return readFrame(buf, delimiterIndex);
}
}
}
return null;
}
}
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