question: private void internalWrite ( byte [ ] b , int off , int len , boolean finish ) throws IOException { coder . output = embiggen ( coder . output , coder . maxOutputSize ( len ) ) ; if ( ! coder . process ( b , off , len , finish ) ) { throw new Base64DataException ( "bad base-64" ) ; } out . write ( coder . output , 0 , coder . op ) ; }
target:  Write the given bytes to the encoder/decoder.