public class UUID extends rpc.uuid_t {

    private static int hex_to_bin ( char[] arr, int offset, int length ) {
        int value = 0;
        int ai, count;

        count = 0;
        for ( ai = offset; ai < arr.length && count < length; ai++ ) {
            value <<= 4;
            switch ( arr[ ai ] ) {
            case '0':
            case '1':
            case '2':
            case '3':
            case '4':
            case '5':

        int value = 0;
        int ai, count;

        count = 0;
        for (ai = offset; ai < arr.length && count < length; ai++) {
            value <<= 4;
            switch (arr[ai]) {
                case '0': case '1': case '2': case '3': case '4':
                case '5': case '6': case '7': case '8': case '9':
                    value += arr[ai] - '0';
                    break;