/**
* Base64-encode the given data and return a newly allocated byte[] with the result.
*
* @param input the data to encode
* @param offset the position within the input array at which to start
* @param len the number of bytes of input to encode
* @param flags controls certain features of the encoded output. Passing {@code DEFAULT} results
* in output that adheres to RFC 2045.
* @return base64 encoded input as bytes
*/
public static byte[] encode(byte[] input, int offset, int len, int flags) {
Encoder encoder = new Encoder(flags, null);
// Compute the exact length of the array we will produce.
int output_len = len / 3 * 4;
// Account for the tail of the data and the padding bytes, if any.
if (encoder.do_padding) {
if (len % 3 > 0) {
output_len += 4;
}
} else {
switch (len % 3) {
case 0:
break;
case 1:
output_len += 2;
break;
case 2:
output_len += 3;
break;
}
}
// Account for the newlines, if any.
if (encoder.do_newline && len > 0) {
output_len += (((len - 1) / (3 * Encoder.LINE_GROUPS)) + 1) * (encoder.do_cr ? 2 : 1);
}
encoder.output = new byte[output_len];
encoder.process(input, offset, len, true);
if (BuildConfig.DEBUG && encoder.op != output_len) {
throw new AssertionError();
}
return encoder.output;
}
