class TestString {
char[] value;
int offset, count;
int indexOf(TestString str, int fromIndex) {
char[] v1 = value, v2 = str.value;
int max = offset + (count - str.count);
int start = offset + ((fromIndex < 0) ? 0 : fromIndex);
i:
for (int i = start; i <= max; i++)
{
int n = str.count, j = i, k = str.offset;
while (n-- != 0) {
if (v1[j++] != v2[k++])
continue i;
}
return i - offset;
}
return -1;
}
}