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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.internal.content;
     18 
     19 import android.os.Build;
     20 import android.util.Slog;
     21 
     22 import java.io.File;
     23 
     24 /**
     25  * Native libraries helper.
     26  *
     27  * @hide
     28  */
     29 public class NativeLibraryHelper {
     30     private static final String TAG = "NativeHelper";
     31 
     32     private static final boolean DEBUG_NATIVE = false;
     33 
     34     private static native long nativeSumNativeBinaries(String file, String cpuAbi, String cpuAbi2);
     35 
     36     /**
     37      * Sums the size of native binaries in an APK.
     38      *
     39      * @param apkFile APK file to scan for native libraries
     40      * @return size of all native binary files in bytes
     41      */
     42     public static long sumNativeBinariesLI(File apkFile) {
     43         final String cpuAbi = Build.CPU_ABI;
     44         final String cpuAbi2 = Build.CPU_ABI2;
     45         return nativeSumNativeBinaries(apkFile.getPath(), cpuAbi, cpuAbi2);
     46     }
     47 
     48     private native static int nativeCopyNativeBinaries(String filePath, String sharedLibraryPath,
     49             String cpuAbi, String cpuAbi2);
     50 
     51     /**
     52      * Copies native binaries to a shared library directory.
     53      *
     54      * @param apkFile APK file to scan for native libraries
     55      * @param sharedLibraryDir directory for libraries to be copied to
     56      * @return {@link PackageManager#INSTALL_SUCCEEDED} if successful or another
     57      *         error code from that class if not
     58      */
     59     public static int copyNativeBinariesIfNeededLI(File apkFile, File sharedLibraryDir) {
     60         final String cpuAbi = Build.CPU_ABI;
     61         final String cpuAbi2 = Build.CPU_ABI2;
     62         return nativeCopyNativeBinaries(apkFile.getPath(), sharedLibraryDir.getPath(), cpuAbi,
     63                 cpuAbi2);
     64     }
     65 
     66     // Convenience method to call removeNativeBinariesFromDirLI(File)
     67     public static boolean removeNativeBinariesLI(String nativeLibraryPath) {
     68         return removeNativeBinariesFromDirLI(new File(nativeLibraryPath));
     69     }
     70 
     71     // Remove the native binaries of a given package. This simply
     72     // gets rid of the files in the 'lib' sub-directory.
     73     public static boolean removeNativeBinariesFromDirLI(File nativeLibraryDir) {
     74         if (DEBUG_NATIVE) {
     75             Slog.w(TAG, "Deleting native binaries from: " + nativeLibraryDir.getPath());
     76         }
     77 
     78         boolean deletedFiles = false;
     79 
     80         /*
     81          * Just remove any file in the directory. Since the directory is owned
     82          * by the 'system' UID, the application is not supposed to have written
     83          * anything there.
     84          */
     85         if (nativeLibraryDir.exists()) {
     86             final File[] binaries = nativeLibraryDir.listFiles();
     87             if (binaries != null) {
     88                 for (int nn = 0; nn < binaries.length; nn++) {
     89                     if (DEBUG_NATIVE) {
     90                         Slog.d(TAG, "    Deleting " + binaries[nn].getName());
     91                     }
     92 
     93                     if (!binaries[nn].delete()) {
     94                         Slog.w(TAG, "Could not delete native binary: " + binaries[nn].getPath());
     95                     } else {
     96                         deletedFiles = true;
     97                     }
     98                 }
     99             }
    100             // Do not delete 'lib' directory itself, or this will prevent
    101             // installation of future updates.
    102         }
    103 
    104         return deletedFiles;
    105     }
    106 }
    107