1 /* 2 * Copyright (c) 2008, 2015, 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 to guess the 35 * MIME type of a file. 36 */ 37 38 public class GnomeFileTypeDetector 39 extends AbstractFileTypeDetector 40 { 41 // true if GIO is available 42 private final boolean gioAvailable; 43 44 public GnomeFileTypeDetector() { 45 gioAvailable = initializeGio(); 46 } 47 48 @Override 49 public String implProbeContentType(Path obj) throws IOException { 50 if (!gioAvailable) 51 return null; 52 if (!(obj instanceof UnixPath)) 53 return null; 54 55 UnixPath path = (UnixPath)obj; 56 NativeBuffer buffer = NativeBuffers.asNativeBuffer(path.getByteArrayForSysCalls()); 57 try { 58 // GIO may access file so need permission check 59 path.checkRead(); 60 byte[] type = probeGio(buffer.address()); 61 return (type == null) ? null : Util.toString(type); 62 } finally { 63 buffer.release(); 64 } 65 66 } 67 68 // GIO 69 private static native boolean initializeGio(); 70 private static synchronized native byte[] probeGio(long pathAddress); 71 72 static { 73 AccessController.doPrivileged(new PrivilegedAction<>() { 74 public Void run() { 75 System.loadLibrary("nio"); 76 return null; 77 }}); 78 } 79 }