smbfile.java

实现网上邻居需要的jar库；可以使用库中的接口实现文件共享的功能

 * @return   The parent directory of this SMB resource or
 *           <code>smb://</code> if the resource refers to the root of the URL
 *           hierarchy which incedentally is also <code>smb://</code>.
 */

    public String getParent() {
        String str = url.getAuthority();

        if( str.length() > 0 ) {
            StringBuffer sb = new StringBuffer( "smb://" );

            sb.append( str );

            getUncPath0();
            if( canon.length() > 1 ) {
                sb.append( canon );
            } else {
                sb.append( '/' );
            }

            str = sb.toString();

            int i = str.length() - 2;
            while( str.charAt( i ) != '/' ) {
                i--;
            }

            return str.substring( 0, i + 1 );
        }

        return "smb://";
    }

/**
 * Returns the full uncanonicalized URL of this SMB resource. An
 * <code>SmbFile</code> constructed with the result of this method will
 * result in an <code>SmbFile</code> that is equal to the original.
 *
 * @return  The uncanonicalized full URL of this SMB resource.
 */

    public String getPath() {
        return url.toString();
    }

    String getUncPath0() {
        if( unc == null ) {
            char[] in = url.getPath().toCharArray();
            char[] out = new char[in.length];
            int length = in.length, i, o, state, s;

                              /* The canonicalization routine
                               */
            state = 0;
            o = 0;
            for( i = 0; i < length; i++ ) {
                switch( state ) {
                    case 0:
                        if( in[i] != '/' ) {
                            return null;
                        }
                        out[o++] = in[i];
                        state = 1;
                        break;
                    case 1:
                        if( in[i] == '/' ) {
                            break;
                        } else if( in[i] == '.' &&
                                    (( i + 1 ) >= length || in[i + 1] == '/' )) {
                            i++;
                            break;
                        } else if(( i + 1 ) < length &&
                                    in[i] == '.' &&
                                    in[i + 1] == '.' &&
                                    (( i + 2 ) >= length || in[i + 2] == '/' )) {
                            i += 2;
                            if( o == 1 ) break;
                            do {
                                o--;
                            } while( o > 1 && out[o - 1] != '/' );
                            break;
                        }
                        state = 2;
                    case 2:
                        if( in[i] == '/' ) {
                            state = 1;
                        }
                        out[o++] = in[i];
                        break;
                }
            }

            canon = new String( out, 0, o );

            if( o > 1 ) {
                o--;
                i = canon.indexOf( '/', 1 );
                if( i < 0 ) {
                    share = canon.substring( 1 );
                    unc = "\\";
                } else if( i == o ) {
                    share = canon.substring( 1, i );
                    unc = "\\";
                } else {
                    share = canon.substring( 1, i );
                    unc = canon.substring( i, out[o] == '/' ? o : o + 1 );
                    unc = unc.replace( '/', '\\' );
                }
            } else {
                share = null;
                unc = "\\";
            }
        }
        return unc;
    }
/**
 * Retuns the Windows UNC style path with backslashs intead of forward slashes.
 *
 * @return  The UNC path.
 */
    public String getUncPath() {
        getUncPath0();
        if( share == null ) {
            return "\\\\" + url.getHost();
        }
        return "\\\\" + url.getHost() + canon.replace( '/', '\\' );
    }
/**
 * Returns the full URL of this SMB resource with '.' and '..' components
 * factored out. An <code>SmbFile</code> constructed with the result of
 * this method will result in an <code>SmbFile</code> that is equal to
 * the original.
 *
 * @return  The canonicalized URL of this SMB resource.
 */

    public String getCanonicalPath() {
        String str = url.getAuthority();
        getUncPath0();
        if( str.length() > 0 ) {
            return "smb://" + url.getAuthority() + canon;
        }
        return "smb://";
    }

/**
 * Retrieves the share associated with this SMB resource. In
 * the case of <code>smb://</code>, <code>smb://workgroup/</code>,
 * and <code>smb://server/</code> URLs which do not specify a share,
 * <code>null</code> will be returned.
 *
 * @return  The share component or <code>null</code> if there is no share
 */

    public String getShare() {
        return share;
    }

    String getServerWithDfs() {
        if (dfsReferral != null) {
            return dfsReferral.server;
        }
        return getServer();
    }
/** 
 * Retrieve the hostname of the server for this SMB resource. If this
 * <code>SmbFile</code> references a workgroup, the name of the workgroup
 * is returned. If this <code>SmbFile</code> refers to the root of this
 * SMB network hierarchy, <code>null</code> is returned.
 * 
 * @return  The server or workgroup name or <code>null</code> if this
 *          <code>SmbFile</code> refers to the root <code>smb://</code> resource.
 */ 

    public String getServer() {
        String str = url.getHost();
        if( str.length() == 0 ) {
            return null;
        }
        return str;
    }

/**
 * Returns type of of object this <tt>SmbFile</tt> represents.
 * @return <tt>TYPE_FILESYSTEM, TYPE_WORKGROUP, TYPE_SERVER, TYPE_SHARE,
 * TYPE_PRINTER, TYPE_NAMED_PIPE</tt>, or <tt>TYPE_COMM</tt>.
 */
    public int getType() throws SmbException {
        if( type == 0 ) {
            if( getUncPath0().length() > 1 ) {
                type = TYPE_FILESYSTEM;
            } else if( share != null ) {
                // treeConnect good enough to test service type
                connect0();
                if( share.equals( "IPC$" )) {
                    type = TYPE_NAMED_PIPE;
                } else if( tree.service.equals( "LPT1:" )) {
                    type = TYPE_PRINTER;
                } else if( tree.service.equals( "COMM" )) {
                    type = TYPE_COMM;
                } else {
                    type = TYPE_SHARE;
                }
            } else if( url.getAuthority() == null || url.getAuthority().length() == 0 ) {
                type = TYPE_WORKGROUP;
            } else {
                UniAddress addr;
                try {
                    addr = getAddress();
                } catch( UnknownHostException uhe ) {
                    throw new SmbException( url.toString(), uhe );
                }
                if( addr.getAddress() instanceof NbtAddress ) {
                    int code = ((NbtAddress)addr.getAddress()).getNameType();
                    if( code == 0x1d || code == 0x1b ) {
                        type = TYPE_WORKGROUP;
                        return type;
                    }
                }
                type = TYPE_SERVER;
            }
        }
        return type;
    }
    boolean isWorkgroup0() throws UnknownHostException {
        if( type == TYPE_WORKGROUP || url.getHost().length() == 0 ) {
            type = TYPE_WORKGROUP;
            return true;
        } else {
            getUncPath0();
            if( share == null ) {
                UniAddress addr = getAddress();
                if( addr.getAddress() instanceof NbtAddress ) {
                    int code = ((NbtAddress)addr.getAddress()).getNameType();
                    if( code == 0x1d || code == 0x1b ) {
                        type = TYPE_WORKGROUP;
                        return true;
                    }
                }
                type = TYPE_SERVER;
            }
        }
        return false;
    }

    Info queryPath( String path, int infoLevel ) throws SmbException {
        connect0();

        if (log.level >= 3)
            log.println( "queryPath: " + path );

        /* normally we'd check the negotiatedCapabilities for CAP_NT_SMBS
         * however I can't seem to get a good last modified time from
         * SMB_COM_QUERY_INFORMATION so if NT_SMBs are requested
         * by the server than in this case that's what it will get
         * regardless of what jcifs.smb.client.useNTSmbs is set
         * to(overrides negotiatedCapabilities).
         */

        /* We really should do the referral before this in case
         * the redirected target has different capabilities. But
         * the way we have been doing that is to call exists() which
         * calls this method so another technique will be necessary
         * to support DFS referral _to_ Win95/98/ME.
         */

        if( tree.session.transport.hasCapability( ServerMessageBlock.CAP_NT_SMBS )) {

            /*
             * Trans2 Query Path Information Request / Response
             */

            Trans2QueryPathInformationResponse response =
                    new Trans2QueryPathInformationResponse( infoLevel );
            send( new Trans2QueryPathInformation( path, infoLevel ), response );

            return response.info;
        } else {

            /*
             * Query Information Request / Response
             */

            SmbComQueryInformationResponse response =
                    new SmbComQueryInformationResponse(
                    tree.session.transport.server.serverTimeZone * 1000 * 60L );
            send( new SmbComQueryInformation( path ), response );
            return response;
        }
    }

/**
 * Tests to see if the SMB resource exists. If the resource refers
 * only to a server, this method determines if the server exists on the
 * network and is advertising SMB services. If this resource refers to
 * a workgroup, this method determines if the workgroup name is valid on
 * the local SMB network. If this <code>SmbFile</code> refers to the root
 * <code>smb://</code> resource <code>true</code> is always returned. If
 * this <code>SmbFile</code> is a traditional file or directory, it will
 * be queried for on the specified server as expected.
 *
 * @return <code>true</code> if the resource exists or is alive or
 *         <code>false</code> otherwise
 */

    public boolean exists() throws SmbException {

        if( attrExpiration > System.currentTimeMillis() ) {
            return isExists;
        }

        attributes = ATTR_READONLY | ATTR_DIRECTORY;
        createTime = 0L;
        lastModified = 0L;
        isExists = false;

        try {
            if( url.getHost().length() == 0 ) {
            } else if( share == null ) {
                if( getType() == TYPE_WORKGROUP ) {
                    UniAddress.getByName( url.getHost(), true );
                } else {
                    UniAddress.getByName( url.getHost() ).getHostName();
                }
            } else if( getUncPath0().length() == 1 ||
                                        share.equalsIgnoreCase( "IPC$" )) {
                connect0(); // treeConnect is good enough
            } else {
                Info info = queryPath( getUncPath0(),
                    Trans2QueryPathInformationResponse.SMB_QUERY_FILE_BASIC_INFO );
                attributes = info.getAttributes();
                createTime = info.getCreateTime();
                lastModified = info.getLastWriteTime();
            }

            /* If any of the above fail, isExists will not be set true
             */

            isExists = true;

        } catch( UnknownHostException uhe ) {
        } catch( SmbException se ) {
            switch (se.getNtStatus()) {
                case NtStatus.NT_STATUS_NO_SUCH_FILE: