NativeLibraryHelper.java revision cef0b39b9211882f59b6bfe1148e2cd247056693
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 17package com.android.internal.content; 18 19import android.content.pm.PackageManager; 20import android.util.Slog; 21 22import java.io.Closeable; 23import java.io.File; 24import java.io.IOException; 25 26/** 27 * Native libraries helper. 28 * 29 * @hide 30 */ 31public class NativeLibraryHelper { 32 private static final String TAG = "NativeHelper"; 33 34 private static final boolean DEBUG_NATIVE = false; 35 36 /** 37 * A handle to an opened APK. Used as input to the various NativeLibraryHelper 38 * methods. Allows us to scan and parse the APK exactly once instead of doing 39 * it multiple times. 40 * 41 * @hide 42 */ 43 public static class ApkHandle implements Closeable { 44 final String apkPath; 45 final long apkHandle; 46 47 public static ApkHandle create(String path) throws IOException { 48 final long handle = nativeOpenApk(path); 49 if (handle == 0) { 50 throw new IOException("Unable to open APK: " + path); 51 } 52 53 return new ApkHandle(path, handle); 54 } 55 56 public static ApkHandle create(File path) throws IOException { 57 return create(path.getAbsolutePath()); 58 } 59 60 private ApkHandle(String apkPath, long apkHandle) { 61 this.apkPath = apkPath; 62 this.apkHandle = apkHandle; 63 } 64 65 @Override 66 public void close() { 67 nativeClose(apkHandle); 68 } 69 } 70 71 72 private static native long nativeOpenApk(String path); 73 private static native void nativeClose(long handle); 74 75 private static native long nativeSumNativeBinaries(long handle, String cpuAbi); 76 77 /** 78 * Sums the size of native binaries in an APK for a given ABI. 79 * 80 * @return size of all native binary files in bytes 81 */ 82 public static long sumNativeBinariesLI(ApkHandle handle, String abi) { 83 return nativeSumNativeBinaries(handle.apkHandle, abi); 84 } 85 86 private native static int nativeCopyNativeBinaries(long handle, 87 String sharedLibraryPath, String abiToCopy); 88 89 /** 90 * Copies native binaries to a shared library directory. 91 * 92 * @param handle APK file to scan for native libraries 93 * @param sharedLibraryDir directory for libraries to be copied to 94 * @return {@link PackageManager#INSTALL_SUCCEEDED} if successful or another 95 * error code from that class if not 96 */ 97 public static int copyNativeBinariesIfNeededLI(ApkHandle handle, File sharedLibraryDir, 98 String abi) { 99 return nativeCopyNativeBinaries(handle.apkHandle, sharedLibraryDir.getPath(), abi); 100 } 101 102 /** 103 * Checks if a given APK contains native code for any of the provided 104 * {@code supportedAbis}. Returns an index into {@code supportedAbis} if a matching 105 * ABI is found, {@link PackageManager#NO_NATIVE_LIBRARIES} if the 106 * APK doesn't contain any native code, and 107 * {@link PackageManager#INSTALL_FAILED_NO_MATCHING_ABIS} if none of the ABIs match. 108 */ 109 public static int findSupportedAbi(ApkHandle handle, String[] supportedAbis) { 110 return nativeFindSupportedAbi(handle.apkHandle, supportedAbis); 111 } 112 113 private native static int nativeFindSupportedAbi(long handle, String[] supportedAbis); 114 115 // Convenience method to call removeNativeBinariesFromDirLI(File) 116 public static boolean removeNativeBinariesLI(String nativeLibraryPath) { 117 return removeNativeBinariesFromDirLI(new File(nativeLibraryPath)); 118 } 119 120 // Remove the native binaries of a given package. This simply 121 // gets rid of the files in the 'lib' sub-directory. 122 public static boolean removeNativeBinariesFromDirLI(File nativeLibraryDir) { 123 if (DEBUG_NATIVE) { 124 Slog.w(TAG, "Deleting native binaries from: " + nativeLibraryDir.getPath()); 125 } 126 127 boolean deletedFiles = false; 128 129 /* 130 * Just remove any file in the directory. Since the directory is owned 131 * by the 'system' UID, the application is not supposed to have written 132 * anything there. 133 */ 134 if (nativeLibraryDir.exists()) { 135 final File[] binaries = nativeLibraryDir.listFiles(); 136 if (binaries != null) { 137 for (int nn = 0; nn < binaries.length; nn++) { 138 if (DEBUG_NATIVE) { 139 Slog.d(TAG, " Deleting " + binaries[nn].getName()); 140 } 141 142 if (!binaries[nn].delete()) { 143 Slog.w(TAG, "Could not delete native binary: " + binaries[nn].getPath()); 144 } else { 145 deletedFiles = true; 146 } 147 } 148 } 149 // Do not delete 'lib' directory itself, or this will prevent 150 // installation of future updates. 151 } 152 153 return deletedFiles; 154 } 155 156 // We don't care about the other return values for now. 157 private static final int BITCODE_PRESENT = 1; 158 159 public static boolean hasRenderscriptBitcode(ApkHandle handle) throws IOException { 160 final int returnVal = hasRenderscriptBitcode(handle.apkHandle); 161 if (returnVal < 0) { 162 throw new IOException("Error scanning APK, code: " + returnVal); 163 } 164 165 return (returnVal == BITCODE_PRESENT); 166 } 167 168 private static native int hasRenderscriptBitcode(long apkHandle); 169} 170