rev 55657 : 8227587: Add internal privileged System.loadLibrary
Reviewed-by: rriggs

   1 /*
   2  * Copyright (c) 1999, 2019, 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 com.sun.media.sound;
  27 


  28 import java.util.StringTokenizer;
  29 
  30 /**
  31  * Audio configuration class for exposing attributes specific to the platform or system.
  32  *
  33  * @author Kara Kytle
  34  * @author Florian Bomers
  35  */
  36 final class Platform {
  37 
  38     // native library we need to load
  39     private static final String libName = "jsound";
  40 
  41     private static boolean isNativeLibLoaded;
  42 
  43     // SYSTEM CHARACTERISTICS
  44     // vary according to hardware architecture
  45 
  46     // intel is little-endian.  sparc is big-endian.
  47     private static boolean bigEndian;
  48 
  49     static {
  50         loadLibraries();
  51     }
  52 
  53     /**
  54      * Private constructor.
  55      */
  56     private Platform() {
  57     }
  58 
  59     /**
  60      * Dummy method for forcing initialization.
  61      */
  62     static void initialize() {
  63     }
  64 
  65     /**
  66      * Determine whether the system is big-endian.
  67      */
  68     static boolean isBigEndian() {
  69         return bigEndian;
  70     }
  71 
  72     /**
  73      * Load the native library or libraries.
  74      */
  75     private static void loadLibraries() {
  76         // load the native library
  77         isNativeLibLoaded = true;
  78         try {
  79             jdk.internal.access.SharedSecrets.getJavaLangAccess().loadLibrary(libName);



  80         } catch (Throwable t) {
  81             if (Printer.err) Printer.err("Couldn't load library "+libName+": "+t.toString());
  82             isNativeLibLoaded = false;
  83         }
  84         if (isNativeLibLoaded) {
  85             bigEndian = nIsBigEndian();
  86         }
  87     }
  88 
  89     static boolean isMidiIOEnabled() {
  90         return isNativeLibLoaded;
  91     }
  92 
  93     static boolean isPortsEnabled() {
  94         return isNativeLibLoaded;
  95     }
  96 
  97     static boolean isDirectAudioEnabled() {
  98         return isNativeLibLoaded;
  99     }
 100 
 101     // the following native method is implemented in Platform.c
 102     private static native boolean nIsBigEndian();
 103 }
--- EOF ---