1 /* 2 * Copyright (c) 2008, 2011, 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.*; 29 import java.io.IOException; 30 import java.security.AccessController; 31 import java.security.PrivilegedAction; 32 33 /** 34 * File type detector that does lookup of file extension using Windows Registry. 35 */ 36 37 public class RegistryFileTypeDetector 38 extends AbstractFileTypeDetector 39 { 40 public RegistryFileTypeDetector() { 41 super(); 42 } 43 44 @Override 45 public String implProbeContentType(Path file) throws IOException { 46 if (!(file instanceof Path)) 47 return null; 48 49 // get file extension 50 Path name = file.getFileName(); 51 if (name == null) 52 return null; 53 String filename = name.toString(); 54 int dot = filename.lastIndexOf('.'); 55 if ((dot < 0) || (dot == (filename.length()-1))) 56 return null; 57 58 // query HKEY_CLASSES_ROOT\<ext> 59 String key = filename.substring(dot); 60 NativeBuffer keyBuffer = WindowsNativeDispatcher.asNativeBuffer(key); 61 NativeBuffer nameBuffer = WindowsNativeDispatcher.asNativeBuffer("Content Type"); 62 try { 63 return queryStringValue(keyBuffer.address(), nameBuffer.address()); 64 } finally { 65 nameBuffer.release(); 66 keyBuffer.release(); 67 } 68 } 69 70 private static native String queryStringValue(long subKey, long name); 71 72 static { 73 AccessController.doPrivileged(new PrivilegedAction<Void>() { 74 @Override 75 public Void run() { 76 // nio.dll has dependency on net.dll 77 System.loadLibrary("net"); 78 System.loadLibrary("nio"); 79 return null; 80 }}); 81 } 82 }