import java.util.zip.*;

public class HomeBrew implements Checksum {

protected long sum;		// a very simplistically calculated checksum

//-------------------------------------------------------------------
// HomeBrew Constructor
//-------------------------------------------------------------------
public HomeBrew() {
	reset();
}
//-------------------------------------------------------------------
// Checksum methods
//-------------------------------------------------------------------
public void update(int b) {
	sum += b;
}
public void update(byte b[], int off, int len) {
	for (int i=off ; (i-off) < len; i++) {
		sum += b[i];
	}
}

public long getValue() {
	return sum;
}
public void reset() {
	sum = 0;
}
} // End of Class HomeBrew