623      * required. So if the final unit of the encoded byte data only has

   623      * required. So if the final unit of the encoded byte data only has

   624      * two or three Base64 characters (without the corresponding padding

   624      * two or three Base64 characters (without the corresponding padding

   625      * character(s) padded), they are decoded as if followed by padding

   625      * character(s) padded), they are decoded as if followed by padding

   626      * character(s). If there is padding character present in the

   626      * character(s). If there is padding character present in the

   627      * final unit, the correct number of padding character(s) must be

   627      * final unit, the correct number of padding character(s) must be

   629      * during decoding.

   630      * during decoding.

   630      *

   631      *

   631      * <p> Instances of {@link Decoder} class are safe for use by

   632      * <p> Instances of {@link Decoder} class are safe for use by

   632      * multiple concurrent threads.

   633      * multiple concurrent threads.

   633      *

   634      *

  1304                         return -1;

  1305                         return -1;

  1305                     else

  1306                     else

  1306                         return off - oldOff;

  1307                         return off - oldOff;

  1307                 }

  1308                 }

  1308                 if (v == '=') {                  // padding byte(s)

  1309                 if (v == '=') {                  // padding byte(s)

  1310                         throw new IOException("Illegal base64 ending sequence:" + nextin);

  1316                         throw new IOException("Illegal base64 ending sequence:" + nextin);

  1311                     }

  1317                     }

  1312                     b[off++] = (byte)(bits >> (16));

  1318                     b[off++] = (byte)(bits >> (16));

  1313                     len--;

  1319                     len--;

  1314                     if (nextin == 0) {           // only one padding byte

  1320                     if (nextin == 0) {           // only one padding byte