byte[] (String s) { if (s.length() == 0) return ArrayUtilRt.EMPTY_BYTE_ARRAY; int i = 0; for (int j = s.length() - 1; j > 0 && s.charAt(j) == '='; j--) { i++; } int len = (s.length() * 6) / 8 - i; byte[] raw = new byte[len]; int l = 0; for (int i1 = 0; i1 < s.length(); i1 += 4) { int n = s.length() - i1; if (n == 1) throw new IllegalArgumentException("Invalid Base64 string"); int j1 = (getValue(s.charAt(i1)) << 18) + (getValue(s.charAt(i1 + 1)) << 12) + (n > 2 ? (getValue(s.charAt(i1 + 2)) << 6) : 0) + (n > 3 ? (getValue(s.charAt(i1 + 3))) : 0); for (int k = 0; k < 3 && l + k < raw.length; k++) { raw[l + k] = (byte)(j1 >> 8 * (2 - k) & 0xff); } l += 3; } return raw; }