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/*
* Минимум - 100
* Начало - (10 цифр) + ','
* Длина 16 x ','
*/
package net.sourceforge.opentracking.protocol.xexun;
import org.jboss.netty.handler.codec.frame.FrameDecoder;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.buffer.ChannelBuffer;
/**
*
*/
public class XexunFrameDecoder extends FrameDecoder {
protected Object decode(
ChannelHandlerContext ctx,
Channel channel,
ChannelBuffer buf) throws Exception {
System.out.println("read: " + buf.readableBytes());
// Check minimum length
int length = buf.readableBytes();
if (length < 100) {
return null;
}
// Find identifier
int index = 0;
int countDigit = 0;
for (; index < length; index++) {
// Check byte
char c = (char) buf.getByte(index);
if (Character.isDigit(c)) {
countDigit++;
}
// Check count
if (countDigit == 10) {
break;
}
}
if (countDigit < 10) {
return null;
}
// Find begin
int beginIndex = 0;
for (; index < length; index++) {
char c = (char) buf.getByte(index);
if (c == ',') {
beginIndex = index;
break;
}
}
if (beginIndex == 0) {
return null;
}
// Find imei
int imeiIndex = 0;
for (; index < length; index++) {
char c = (char) buf.getByte(index);
if (c == ':') {
imeiIndex = index;
break;
}
}
if (imeiIndex == 0) {
return null;
}
// Find end
int endIndex = 0;
for (; index < length; index++) {
char c = (char) buf.getByte(index);
if (c == ',') {
endIndex = index;
break;
}
}
if (endIndex == 0) {
return null;
}
// Read buffer
buf.skipBytes(beginIndex);
ChannelBuffer frame = buf.readBytes(endIndex - beginIndex + 1);
return frame;
}
}
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