question: public BerInputStream ( InputStream in , int initialSize ) throws IOException { this . in = in ; buffer = new byte [ initialSize ] ; next ( ) ; if ( length != INDEFINIT_LENGTH ) { if ( buffer . length < ( length + offset ) ) { byte [ ] newBuffer = new byte [ length + offset ] ; System . arraycopy ( buffer , 0 , newBuffer , 0 , offset ) ; buffer = newBuffer ; } } else { isIndefinedLength = true ; throw new ASN1Exception ( "Decoding indefinite length encoding is not supported" ) ; } }
target:  Creates stream for decoding.