Move //webapk to //chrome/android/webapk

webapk/libs/client/src/org/chromium/webapk/lib/client/DexOptimizer.java

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-package org.chromium.webapk.lib.client;
-
-import android.os.Build;
-import android.util.Log;
-
-import dalvik.system.DexClassLoader;
-import dalvik.system.DexFile;
-
-import java.io.File;
-import java.io.IOException;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-
-/**
- * This class provides a method to optimize .dex files.
- * Note: This class is copied (mostly) verbatim from DexOptUtils in GMSCore.
- */
-public class DexOptimizer {
-    private static final String TAG = "cr_DexOptimzer";
-
-    private static final String DEX_SUFFIX = ".dex";
-    private static final String ODEX_SUFFIX = ".odex";
-
-    /**
-     * Creates optimized odex file for the specified dex file.
-     * @param dexFile Path to a dex file.
-     * @return True if the dex file was successfully optimized.
-     */
-    public static boolean optimize(File dexFile) {
-        if (!dexFile.exists()) {
-            Log.e(TAG, "Dex file does not exist! " + dexFile.getAbsolutePath());
-            return false;
-        }
-
-        try {
-            if (!DexFile.isDexOptNeeded(dexFile.getAbsolutePath())) {
-                return true;
-            }
-        } catch (Exception e) {
-            Log.e(TAG, "Failed to check optimization status: " + e.toString() + " : "
-                            + e.getMessage());
-        }
-
-        File odexDir = null;
-        try {
-            odexDir = ensureOdexDirectory(dexFile);
-        } catch (IOException e) {
-            Log.e(TAG, "Failed to create odex directory! " + e.getMessage());
-            return false;
-        }
-
-        File generatedDexDir = odexDir;
-        if (generatedDexDir.equals(dexFile.getParentFile())) {
-            generatedDexDir = new File(odexDir, "optimized");
-            generatedDexDir.mkdirs();
-        }
-
-        new DexClassLoader(
-                dexFile.getAbsolutePath(),
-                generatedDexDir.getAbsolutePath(),
-                null,
-                ClassLoader.getSystemClassLoader());
-        File optimizedFile = new File(generatedDexDir, dexFile.getName());
-        if (!optimizedFile.exists()) {
-            Log.e(TAG, "Failed to create dex.");
-            return false;
-        }
-
-        File destOdexFile = new File(odexDir, replaceExtension(optimizedFile.getName(), "odex"));
-        if (!optimizedFile.renameTo(destOdexFile)) {
-            Log.e(TAG, "Failed to rename optimized file.");
-            return false;
-        }
-
-        if (!destOdexFile.setReadable(true, false)) {
-            Log.e(TAG, "Failed to make odex world readable.");
-            return false;
-        }
-
-        return true;
-    }
-
-    /**
-     * Guesses the directory that DexClassLoader looks in for the odex file based on the
-     * Android OS version and the dex path.
-     * @param dexPath
-     * @return Guess for the default odex directory.
-     */
-    private static File odexDirectory(File dexPath) {
-        int currentApiVersion = Build.VERSION.SDK_INT;
-        try {
-            if (currentApiVersion >= Build.VERSION_CODES.M) {
-                return new File(
-                        dexPath.getParentFile(), "oat/" + VMRuntime.getCurrentInstructionSet());
-            } else if (currentApiVersion >= Build.VERSION_CODES.LOLLIPOP) {
-                return new File(dexPath.getParentFile(), VMRuntime.getCurrentInstructionSet());
-            } else {
-                return dexPath.getParentFile();
-            }
-        } catch (NoSuchMethodException e) {
-            return null;
-        }
-    }
-
-    /**
-     * Guesses the directory that DexClassLoader looks in for the odex file based on the
-     * Android OS version and the dex path. Creates the directory if it does not exist.
-     * @param dexPath
-     * @return Guess for the default odex directory.
-     */
-    private static File ensureOdexDirectory(File dexPath) throws IOException {
-        File odexDir = odexDirectory(dexPath);
-        if (odexDir == null) {
-            throw new IOException("Failed to create odex cache directory. "
-                    + "Could not determine odex directory.");
-        }
-        if (!odexDir.exists()) {
-            boolean success = odexDir.mkdirs();
-            if (!success) {
-                throw new IOException(
-                        "Failed to create odex cache directory in data directory.");
-            }
-            // The full path to the odex must be traversable.
-            File root = dexPath.getParentFile();
-            File dir = odexDir;
-            while (dir != null && !root.equals(dir)) {
-                if (!dir.setExecutable(true, false)) {
-                    throw new IOException("Failed to make odex directory world traversable: "
-                            + dir.getAbsolutePath());
-                }
-                dir = dir.getParentFile();
-            }
-        }
-        return odexDir;
-    }
-
-    /**
-     * Replaces a file name's extension.
-     *
-     * @param name File name to modify.
-     * @param extension New extension.
-     * @return File name with new extension.
-     */
-    private static String replaceExtension(String name, String extension) {
-        int lastDot = name.lastIndexOf(".");
-        StringBuilder sb = new StringBuilder(lastDot + extension.length());
-        sb.append(name, 0, lastDot + 1);
-        sb.append(extension);
-        return sb.toString();
-    }
-
-    /**
-     * Makes use of a hidden API to retrieve the instruction set name for the currently
-     * executing process. This string is used to form the directory name for the generated
-     * odex.
-     *
-     * - This API is not available on pre-L devices, but as the pre-L runtime did not scope odex
-     *   files by <isa> on pre-L, this is not a problem.
-     *
-     * - For devices L+, it's still possible for this API to be missing. In that case
-     *   we will fallback to A) interpretation, and failing that B) generate an odex in the
-     *   client's file space.
-     */
-    private static class VMRuntime {
-        @SuppressWarnings("unchecked")
-        public static String getCurrentInstructionSet() throws NoSuchMethodException {
-            Method getCurrentInstructionSetMethod;
-            try {
-                Class c = Class.forName("dalvik.system.VMRuntime");
-                getCurrentInstructionSetMethod = c.getDeclaredMethod("getCurrentInstructionSet");
-            } catch (ClassNotFoundException | NoSuchMethodException e) {
-                Log.w(TAG, "dalvik.system.VMRuntime#getCurrentInstructionSet is unsupported.", e);
-                throw new NoSuchMethodException(
-                        "dalvik.system.VMRuntime#getCurrentInstructionSet could not be found.");
-            }
-            try {
-                return (String) getCurrentInstructionSetMethod.invoke(null);
-            } catch (IllegalAccessException | InvocationTargetException e) {
-                Log.w(TAG, "Failed to call dalvik.system.VMRuntime#getCurrentInstructionSet", e);
-                throw new NoSuchMethodException(
-                        "dalvik.system.VMRuntime#getCurrentInstructionSet could not be found.");
-            }
-        }
-    }
-}