1 /* 2 * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package sun.nio.fs; 27 28 import java.nio.file.Path; 29 import java.io.IOException; 30 import java.security.AccessController; 31 import java.security.PrivilegedAction; 32 33 /** 34 * File type detector that uses the GNOME I/O library or the deprecated 35 * GNOME VFS to guess the MIME type of a file. 36 */ 37 38 public class GnomeFileTypeDetector 39 extends AbstractFileTypeDetector 40 { 41 private static final String GNOME_VFS_MIME_TYPE_UNKNOWN = 42 "application/octet-stream"; 43 44 // true if GIO available 45 private final boolean gioAvailable; 46 47 // true if GNOME VFS available and GIO is not available 48 private final boolean gnomeVfsAvailable; 49 50 public GnomeFileTypeDetector() { 51 gioAvailable = initializeGio(); 52 if (gioAvailable) { 53 gnomeVfsAvailable = false; 54 } else { 55 gnomeVfsAvailable = initializeGnomeVfs(); 56 } 57 } 58 59 @Override 60 public String implProbeContentType(Path obj) throws IOException { 61 if (!gioAvailable && !gnomeVfsAvailable) 62 return null; 63 if (!(obj instanceof UnixPath)) 64 return null; 65 66 UnixPath path = (UnixPath)obj; 67 NativeBuffer buffer = NativeBuffers.asNativeBuffer(path.getByteArrayForSysCalls()); 68 try { 69 if (gioAvailable) { 70 // GIO may access file so need permission check 71 path.checkRead(); 72 byte[] type = probeUsingGio(buffer.address()); 73 return (type == null) ? null : Util.toString(type); 74 } else { 75 byte[] type = probeUsingGnomeVfs(buffer.address()); 76 if (type == null) 77 return null; 78 String s = Util.toString(type); 79 return s.equals(GNOME_VFS_MIME_TYPE_UNKNOWN) ? null : s; 80 } 81 } finally { 82 buffer.release(); 83 } 84 85 } 86 87 // GIO 88 private static native boolean initializeGio(); 89 private static native byte[] probeUsingGio(long pathAddress); 90 91 // GNOME VFS 92 private static native boolean initializeGnomeVfs(); 93 private static native byte[] probeUsingGnomeVfs(long pathAddress); 94 95 static { 96 AccessController.doPrivileged(new PrivilegedAction<Void>() { 97 public Void run() { 98 System.loadLibrary("nio"); 99 return null; 100 }}); 101 } 102 }