// reads
            return (int) ( this.fp - start );
        }
    }


    /**
     * This stream class is unbuffered. Therefore this method will always
     * return 0 for streams connected to regular files. However, a
     * stream created from a Named Pipe this method will query the server using a
     * "peek named pipe" operation and return the number of available bytes

        private final OutputStream stream;

        private final OutputStream collector;

        public CacheStream(OutputStream stream, OutputStream collector) {
            this.stream = stream;
            this.collector = collector;
        }

        public void close() throws IOException {
            stream.close();
            collector.close();
        }

     * Writes b.length bytes from the specified byte array to this
     * file output stream.
     *
     * @throws IOException
     *             if a network error occurs
     */

    @Override
    public void write ( byte[] b ) throws IOException {
        write(b, 0, b.length);
    }


    /**
     * @return whether the stream is open
     */
    public boolean isOpen () {

        ASN1InputStream stream = new ASN1InputStream(new ByteArrayInputStream(token));
        ASN1TaggedObject derToken;
        try {
            derToken = ASN1Util.as(ASN1TaggedObject.class, stream);
            if ( derToken.getTagClass() != BERTags.APPLICATION )
                throw new PACDecodingException("Malformed kerberos ticket");
            stream.close();
        }
        catch ( IOException e ) {

import org.slf4j.LoggerFactory;

import jcifs.RuntimeCIFSException;
import jcifs.smb.RequestParam;


/**
 * This class simplifies communication for protocols that support
 * multiplexing requests. It encapsulates a stream and some protocol
 * knowledge (provided by a concrete subclass) so that connecting,
 * disconnecting, sending, and receiving can be syncronized
 * properly. Apparatus is provided to send and receive requests
 * concurrently.

                            .openUnshared("\\pipe" + getUncPath(), this.openFlags, this.access, this.sharing, SmbConstants.ATTR_NORMAL, 0);
                }
                // one extra acquire to keep this open till the stream is released
                return this.handle.acquire();
            }

        }
        log.trace("Pipe already open");
        return this.handle.acquire();
    }


    /**

        private final OutputStream stream;

        private final OutputStream collector;


        public CacheStream ( OutputStream stream, OutputStream collector ) {
            this.stream = stream;
            this.collector = collector;
        }


        @Override
        public void close () throws IOException {
            this.stream.close();
            this.collector.close();

     * @return output stream, needs to be closed when finished
     * @throws CIFSException
     */
    OutputStream openOutputStream ( boolean append ) throws CIFSException;


    /**
     * Opens an output stream writing to the file (truncating, write only, sharable)
     * 
     * @return output stream, needs to be closed when finished
     * @throws CIFSException
     */

    synchronized SmbFileHandleImpl ensureOpen () throws CIFSException {
        // ensure file is open
        if ( this.handle == null || !this.handle.isValid() ) {
            // one extra acquire to keep this open till the stream is released
            this.handle = this.file.openUnshared(this.openFlags, this.access, this.sharing, SmbConstants.ATTR_NORMAL, this.options).acquire();
            return this.handle;
        }

     * 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