LibraryUtils.java

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/*
 * Sleuth Kit Data Model
 * 
 * Copyright 2013 Basis Technology Corp.
 * Contact: carrier <at> sleuthkit <dot> org
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.sleuthkit.datamodel;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;

public class LibraryUtils {

        public static final String[] EXTS = new String[]{".so", ".dylib", ".dll", ".jnilib"}; //NON-NLS

        public enum Lib {

                MSVCP("msvcp100", ""), //NON-NLS
                MSVCR("msvcr100", ""), //NON-NLS
                ZLIB("zlib", "z"), //NON-NLS
                LIBEWF("libewf", "ewf"), //NON-NLS
                TSK_JNI("libtsk_jni", "tsk_jni"); //NON-NLS

                private final String name;
                private final String unixName;

                Lib(String name, String unixName) {
                        this.name = name;
                        this.unixName = unixName;
                }

                public String getLibName() {
                        return this.name;
                }

                public String getUnixName() {
                        return this.unixName;
                }
        }

        public static boolean loadSleuthkitJNI() {
                boolean loaded = LibraryUtils.loadNativeLibFromTskJar(Lib.TSK_JNI);
                if (!loaded) {
                        System.out.println("SleuthkitJNI: failed to load " + Lib.TSK_JNI.getLibName()); //NON-NLS
                } else {
                        System.out.println("SleuthkitJNI: loaded " + Lib.TSK_JNI.getLibName()); //NON-NLS
                }
                return loaded;
        }

        private static String getPlatform() {
                String os = System.getProperty("os.name").toLowerCase();
                if (LibraryUtils.isWindows()) {
                        os = "win"; //NON-NLS
                } else if (LibraryUtils.isMac()) {
                        os = "mac"; //NON-NLS
                } else if (LibraryUtils.isLinux()) {
                        os = "linux"; //NON-NLS
                }
                // os.arch represents the architecture of the JVM, not the os
                String arch = System.getProperty("os.arch");
                return arch.toLowerCase() + "/" + os.toLowerCase();
        }

        private static boolean isWindows() {
                return System.getProperty("os.name").toLowerCase().contains("windows"); //NON-NLS
        }

        private static boolean isMac() {
                return System.getProperty("os.name").toLowerCase().contains("mac"); //NON-NLS
        }

        private static boolean isLinux() {
                return System.getProperty("os.name").equals("Linux"); //NON-NLS
        }

        private static boolean loadNativeLibFromTskJar(Lib library) {
                String libName = library.getLibName();

                // find the library in the jar file
                StringBuilder pathInJarBase = new StringBuilder();
                pathInJarBase.append("/NATIVELIBS/"); //NON-NLS
                pathInJarBase.append(getPlatform());
                pathInJarBase.append("/");
                pathInJarBase.append(libName);

                URL urlInJar = null;
                String libExt = null;
                for (String ext : EXTS) {
                        urlInJar = SleuthkitJNI.class.getResource(pathInJarBase.toString() + ext);
                        if (urlInJar != null) {
                                libExt = ext;
                                break;
                        }
                }

                if (urlInJar == null) {
                        System.out.println("Library not found in jar (" + libName + ")"); //NON-NLS
                        return false;
                }

                // copy library to temp folder and load it
                try {
                        java.io.File tempLibFile = new java.io.File(System.getProperty("java.io.tmpdir") + java.io.File.separator + libName + libExt); //NON-NLS
                        System.out.println("Temp Folder for Libraries: " + tempLibFile.getParent()); //NON-NLS

                        // cycle through the libraries and delete them. 
                        // we used to copy dlls into here. 
                        // delete any than may still exist from previous installations. 
                        // Dec 2013
                        for (Lib l : Lib.values()) {
                                String ext = getExtByPlatform();
                                // try the windows version
                                java.io.File f = new java.io.File(l.getLibName() + ext);
                                //System.out.println(f.getName());
                                if (f.exists()) {
                                        f.delete();
                                } else {
                                        // try the unix version
                                        java.io.File fUnix = new java.io.File(l.getUnixName() + ext);
                                        //System.out.println(fUnix.getName());
                                        if (fUnix.exists()) {
                                                fUnix.delete();
                                        }
                                }
                        }

                        // Delete old file
                        if (tempLibFile.exists()) {
                                if (tempLibFile.delete() == false) {
                                        System.out.println("Error deleting old native library.  Is the app already running? (" + tempLibFile.toString() + ")"); //NON-NLS
                                        return false;
                                }
                        }

                        // copy it
                        InputStream in = urlInJar.openStream();
                        OutputStream out = new FileOutputStream(tempLibFile);

                        byte[] buffer = new byte[1024];
                        int length;
                        while ((length = in.read(buffer)) > 0) {
                                out.write(buffer, 0, length);
                        }
                        in.close();
                        out.close();

                        // load it
                        System.load(tempLibFile.getAbsolutePath());
                } catch (IOException e) {
                        // Loading failed.
                        System.out.println("Error loading library: " + e.getMessage()); //NON-NLS
                        return false;
                }
                return true;
        }

        private static String getExtByPlatform() {
                if (isWindows()) {
                        return ".dll"; //NON-NLS
                } else if (isMac()) {
                        return ".dylib"; //NON-NLS
                } else {
                        return ".so"; //NON-NLS
                }
        }
}