throw new SmbException("Already closed");
        }

        if ( this.input != null ) {
            return this.input;
        }

        try ( SmbTreeHandleImpl th = ensureTreeConnected() ) {
            this.input = new SmbPipeInputStream(this, th);
        }
        return this.input;
    }


    /**
     * {@inheritDoc}
     *

public abstract class Transport implements Runnable, AutoCloseable {

    private static int id = 0;
    private static final Logger log = LoggerFactory.getLogger(Transport.class);


    /**
     * Read bytes from the input stream into a buffer
     * 
     * @param in
     * @param b
     * @param off
     * @param len
     * @return number of bytes read
     * @throws IOException
     */

        if ( !allZeros8(input, pos) ) {
            byte[] challengeBytes = new byte[8];
            System.arraycopy(input, pos, challengeBytes, 0, challengeBytes.length);
            setChallenge(challengeBytes);
        }
        pos += 8;

        if ( targetNameOff < pos + 8 || input.length < pos + 8 ) {
            // no room for Context/Reserved
            return;
        }

        if ( !allZeros8(input, pos) ) {

    /**
     * Reads up to b.length bytes of data from this input stream into an array of bytes.
     *
     * @throws IOException
     *             if a network error occurs
     */

    @Override
    public int read ( byte[] b ) throws IOException {
        return read(b, 0, b.length);
    }


    /**
     * Reads up to len bytes of data from this input stream into an array of bytes.
     *

    /**
     * Opens an input stream reading the file (read only)
     * 
     * @param flags
     *            open flags
     * @param access
     *            desired access flags
     * @param sharing
     *            flags indicating for which operations others may open the file (FILE_SHARING_*)
     * @return input stream, needs to be closed when finished
     * @throws CIFSException

                    this.fp = cur;
                }
                break;
            default:
                input.append((char) c);
                break;
            }
        }

        if ( ( c == -1 ) && ( input.length() == 0 ) ) {
            return null;
        }

        return input.toString();
    }


    @Override
    public final String readUTF () throws SmbException {

     * actually purer. However, in the case of smb we know the
     * wordCount and byteCount. And since every subclass of
     * ServerMessageBlock would have to perform the same read
     * operation on the input stream, we might as will pull that
     * common functionality into the superclass and read wordCount
     * and byteCount worth of data.
     * 
     * We will still use the readXxxWireFormat return values to

     * actually purer. However, in the case of smb we know the
     * wordCount and byteCount. And since every subclass of
     * ServerMessageBlock would have to perform the same read
     * operation on the input stream, we might as will pull that
     * common functionality into the superclass and read wordCount
     * and byteCount worth of data.
     * 
     * We will still use the readXxxWireFormat return values to

    /**
     * Update digest with data
     * 
     * @param input
     * @param offset
     * @param len
     */
    public void update ( byte[] input, int offset, int len ) {
        if ( log.isTraceEnabled() ) {
            log.trace("update: " + this.updates + " " + offset + ":" + len);
            log.trace(Hexdump.toHexString(input, offset, Math.min(len, 256)));
        }
        if ( len == 0 ) {

                    }
                    break;
                default:
                    input.append( (char)c );
                    break;
            }
        }

        if ((c == -1) && (input.length() == 0)) {
            return null;
        }

        return input.toString();
    }

    public final String readUTF() throws SmbException {
        int size = readUnsignedShort();