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/*
* Copyright 2024 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.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;
public class HuabaoFrameEncoder extends MessageToByteEncoder<ByteBuf> {
@Override
protected void encode(ChannelHandlerContext ctx, ByteBuf msg, ByteBuf out) {
int startIndex = msg.readerIndex();
while (msg.isReadable()) {
int index = msg.readerIndex();
int b = msg.readUnsignedByte();
if (b == 0x7d) {
out.writeByte(0x7d);
out.writeByte(0x01);
} else if (b == 0x7e && index != startIndex && msg.isReadable()) {
out.writeByte(0x7d);
out.writeByte(0x02);
} else {
out.writeByte(b);
}
}
}
}
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