Improve parsing of invalid data, throwing more specific messages

git-svn-id: https://j8583.svn.sourceforge.net/svnroot/j8583/j8583@108 db60a039-f72e-0410-b1d2-baa000846441

src/main/java/com/solab/iso8583/parse/NumericParseInfo.java

@@ -36,6 +36,12 @@ public class NumericParseInfo extends AlphaNumericFieldParseInfo {
 	}
 
 	public IsoValue<Number> parseBinary(byte[] buf, int pos, CustomField<?> custom) throws ParseException {
+		if (pos < 0) {
+			throw new ParseException(String.format("Invalid bin NUMERIC position %d", pos), pos);
+		} else if (pos+length > buf.length) {
+			throw new ParseException(String.format("Insufficient data for bin %s field of length %d, pos %d",
+				type, length, pos), pos);
+		}
 		//A long covers up to 18 digits
 		if (length < 19) {
 			long l = 0;