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/*
* Copyright 2021 - 2022 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;
import org.traccar.BasePipelineFactory;
import java.nio.charset.StandardCharsets;
import java.util.BitSet;
public class NavtelecomFrameDecoder extends BaseFrameDecoder {
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
if (buf.getByte(buf.readerIndex()) == 0x7f) {
buf.skipBytes(1);
return null;
} else if (buf.getByte(buf.readerIndex()) == '@') {
int length = buf.getUnsignedShortLE(12) + 12 + 2 + 2;
if (buf.readableBytes() >= length) {
return buf.readRetainedSlice(length);
}
} else {
NavtelecomProtocolDecoder protocolDecoder =
BasePipelineFactory.getHandler(ctx.pipeline(), NavtelecomProtocolDecoder.class);
if (protocolDecoder == null) {
throw new RuntimeException("Decoder not found");
}
String type = buf.getCharSequence(buf.readerIndex(), 2, StandardCharsets.US_ASCII).toString();
BitSet bits = protocolDecoder.getBits();
if (type.equals("~A")) {
int count = buf.getUnsignedByte(buf.readerIndex() + 2);
int length = 2 + 1 + 1;
for (int i = 0; i < count; i++) {
for (int j = 0; j < bits.length(); j++) {
if (bits.get(j)) {
length += NavtelecomProtocolDecoder.getItemLength(j + 1);
}
}
}
if (buf.readableBytes() >= length) {
return buf.readRetainedSlice(length);
}
} else {
throw new UnsupportedOperationException("Unsupported message type: " + type);
}
}
return null;
}
}
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