question: public ByteVector putByteArray ( final byte [ ] b , final int off , final int len ) { if ( length + len > data . length ) { enlarge ( len ) ; } if ( b != null ) { System . arraycopy ( b , off , data , length , len ) ; } length += len ; return this ; }
target:  Puts an array of bytes into this byte vector. The byte vector is automatically enlarged if necessary.