private void toUpperCase(byte[] data, int start, int len) { int end = start + len; int dist = 'A' - 'a'; for (int i = start; i < end; i++) { if (data[i] >= 'a' && data[i] <= 'z') { data[i] += dist; } } } private void toLowerCase(byte[] data, int start, int len) { int end = start + len; int dist = 'a' - 'A'; for (int i = start; i < end; i++) { if (data[i] >= 'A' && data[i] <= 'Z') { data[i] += dist; } } }