Class Base64Utility


  • public final class Base64Utility
    extends Object
    This class converts to/from base64. The alternative conversions include: encode: byte[] into String byte[] into char[] byte[] into OutStream byte[] into Writer decode: char[] into byte[] String into byte[] char[] into OutStream String into OutStream
    • Method Detail

      • decodeChunk

        public static byte[] decodeChunk​(char[] id,
                                         int o,
                                         int l)
                                  throws Base64Exception
        The decode_chunk routine decodes a chunk of data into its native encoding. base64 encodes each 3 octets of data into 4 characters from a limited 64 character set. The 3 octets are joined to form 24 bits which are then split into 4 x 6bit values. Each 6 bit value is then used as an index into the 64 character table of base64 chars. If the total data length is not a 3 octet multiple the '=' char is used as padding for the final 4 char group, either 1 octet + '==' or 2 octets + '='.
        Parameters:
        id - The input data to be processed
        o - The offset from which to begin processing
        l - The length (bound) at which processing is to end
        Returns:
        The decoded data
        Throws:
        Base64Exception - Thrown is processing fails due to formatting exceptions in the encoded data
      • encode

        public static String encode​(byte[] id)
      • encode

        public static String encode​(byte[] id,
                                    boolean urlSafe)
      • encodeChunk

        public static char[] encodeChunk​(byte[] id,
                                         int o,
                                         int l)
      • encodeChunk

        public static char[] encodeChunk​(byte[] id,
                                         int o,
                                         int l,
                                         boolean urlSafe)
      • isValidBase64

        public static boolean isValidBase64​(int ch)