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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;
/**
* Created by Ivan Muratov @binakot on 12.07.2017.
*/
public class Arnavi4FrameDecoder extends FrameDecoder {
static final byte HEADER_START_SIGN = (byte) 0xFF;
static final byte HEADER_VERSION_1 = 0x22;
static final byte HEADER_VERSION_2 = 0x23;
static final int HEADER_LENGTH = 10;
static final byte PACKAGE_START_SIGN = 0x5B;
static final byte PACKAGE_END_SIGN = 0x5D;
static final int PACKAGE_MIN_PARCEL_NUMBER = 0x01;
static final int PACKAGE_MAX_PARCEL_NUMBER = 0xFB;
@Override
protected Object decode(
ChannelHandlerContext ctx,
Channel channel,
ChannelBuffer buf) throws Exception {
if (buf.readableBytes() == 0) {
return null;
}
byte[] bytes = new byte[buf.readableBytes()];
buf.getBytes(0, bytes);
if (bytes[0] == HEADER_START_SIGN
&& bytes.length == HEADER_LENGTH
&& (bytes[1] == HEADER_VERSION_1 || bytes[1] == HEADER_VERSION_2)) {
return buf.readBytes(HEADER_LENGTH);
}
int parcelNumber = bytes[1] & 0xFF;
if (bytes[0] == PACKAGE_START_SIGN && bytes[bytes.length - 1] == PACKAGE_END_SIGN
&& parcelNumber >= PACKAGE_MIN_PARCEL_NUMBER && parcelNumber <= PACKAGE_MAX_PARCEL_NUMBER) {
return buf.readBytes(bytes.length);
}
return null;
}
}
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