if ( a.atLeast(b) ) {
            return a;
        }
        return b;
    }


    /**
     * @param min
     *            may be null for open end
     * @param max
     *            may be null for open end
     * @return range of versions
     */
    public static Set<DialectVersion> range ( DialectVersion min, DialectVersion max ) {

        }

        this.treeHandle = th.acquire();
        try {
            this.next = open();
        }
        catch ( Exception e ) {
            this.treeHandle.release();
            throw e;
        }

    }


    private FileEntry open () throws CIFSException {
        this.treeHandle.send(this.request, this.response);
        checkStatus();

        return tree != null && tree.connectionState == 2;
    }
    int open0( int flags, int access, int attrs, int options ) throws SmbException {
        int f;

        connect0();

        if( log.level >= 3 )
            log.println( "open0: " + unc );

        /*
         * NT Create AndX / Open AndX Request / Response
         */

        if ( !"A:".equals(svc) ) {
            switch ( request.getCommand() ) {
            case ServerMessageBlock.SMB_COM_OPEN_ANDX:
            case ServerMessageBlock.SMB_COM_NT_CREATE_ANDX:
            case ServerMessageBlock.SMB_COM_READ_ANDX:
            case ServerMessageBlock.SMB_COM_WRITE_ANDX:

        case SMB_COM_DELETE:
            return cfg.getBatchLimit("TreeConnectAndX.Delete");
        case SMB_COM_DELETE_DIRECTORY:
            return cfg.getBatchLimit("TreeConnectAndX.DeleteDirectory");
        case SMB_COM_OPEN_ANDX:
            return cfg.getBatchLimit("TreeConnectAndX.OpenAndX");
        case SMB_COM_RENAME:
            return cfg.getBatchLimit("TreeConnectAndX.Rename");
        case SMB_COM_TRANSACTION:

            return;
        }
        if( service.equals( "A:" ) == false ) {
            switch( request.command ) {
                case ServerMessageBlock.SMB_COM_OPEN_ANDX:
                case ServerMessageBlock.SMB_COM_NT_CREATE_ANDX:
                case ServerMessageBlock.SMB_COM_READ_ANDX:
                case ServerMessageBlock.SMB_COM_WRITE_ANDX:

 * are "allowed". If all of the desired access bits are not "allowed"
 * the then same process is repeated for inherited ACEs.
 * <p>
 * For example, if user <tt>WNET\alice</tt> tries to open a file
 * with desired access bits <tt>0x00000003</tt> (<tt>FILE_READ_DATA |
 * FILE_WRITE_DATA</tt>) and the target file has the following security
 * descriptor ACEs:
 * <pre>
 * Allow WNET\alice     0x001200A9  Direct

	<groupId>org.codelibs</groupId>
	<artifactId>jcifs</artifactId>
	<version>2.1.38-SNAPSHOT</version>
	<packaging>jar</packaging>
	<name>jCIFS</name>
	<url>https://github.com/codelibs/jcifs</url>
	<description>JCIFS is an Open Source client library that implements the CIFS/SMB networking protocol in 100% Java</description>
	<licenses>
		<license>
			<name>GNU Lesser General Public License, version 2.1</name>

        "The pipe state is invalid.",
        "All pipe instances are busy.",
        "No process is on the other end of the pipe.",
        "The pipe is being closed.",
        "Waiting for a process to open the other end of the pipe.",
        "Access is denied.",
        "A duplicate name exists on the network.",
        "The specified network name is no longer available.",
        "Network access is denied.",

        "The pipe state is invalid.", "All pipe instances are busy.", "No process is on the other end of the pipe.", "The pipe is being closed.",
        "Waiting for a process to open the other end of the pipe.", "File is a directory.", "A duplicate name exists on the network.",