| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * 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 libcore.io; |
| |
| import com.android.layoutlib.bridge.impl.DelegateManager; |
| import com.android.layoutlib.bridge.libcore.io.BridgeBufferIterator; |
| import com.android.tools.layoutlib.annotations.LayoutlibDelegate; |
| |
| import android.system.ErrnoException; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.RandomAccessFile; |
| import java.nio.ByteOrder; |
| import java.nio.MappedByteBuffer; |
| import java.nio.channels.FileChannel.MapMode; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * Delegate used to provide alternate implementation of select methods of {@link MemoryMappedFile}. |
| */ |
| public class MemoryMappedFile_Delegate { |
| |
| private static final DelegateManager<MemoryMappedFile_Delegate> sManager = new |
| DelegateManager<MemoryMappedFile_Delegate>(MemoryMappedFile_Delegate.class); |
| |
| private static final Map<MemoryMappedFile, Long> sMemoryMappedFileMap = |
| new HashMap<MemoryMappedFile, Long>(); |
| |
| private final MappedByteBuffer mMappedByteBuffer; |
| private final long mSize; |
| |
| /** Path on the target device where the data file is available. */ |
| private static final String TARGET_PATH = System.getenv("ANDROID_ROOT") + "/usr/share/zoneinfo"; |
| /** Path on the host (inside the SDK) where the data files are available. */ |
| private static File sRootPath; |
| |
| @LayoutlibDelegate |
| static MemoryMappedFile mmapRO(String path) throws ErrnoException { |
| if (!path.startsWith(TARGET_PATH)) { |
| throw new ErrnoException("Custom timezone data files are not supported.", 1); |
| } |
| if (sRootPath == null) { |
| throw new ErrnoException("Bridge has not been initialized properly.", 1); |
| } |
| path = path.substring(TARGET_PATH.length()); |
| try { |
| File f = new File(sRootPath, path); |
| if (!f.exists()) { |
| throw new ErrnoException("File not found: " + f.getPath(), 1); |
| } |
| RandomAccessFile file = new RandomAccessFile(f, "r"); |
| try { |
| long size = file.length(); |
| MemoryMappedFile_Delegate newDelegate = new MemoryMappedFile_Delegate(file); |
| long filePointer = file.getFilePointer(); |
| MemoryMappedFile mmFile = new MemoryMappedFile(filePointer, size); |
| long delegateIndex = sManager.addNewDelegate(newDelegate); |
| sMemoryMappedFileMap.put(mmFile, delegateIndex); |
| return mmFile; |
| } finally { |
| file.close(); |
| } |
| } catch (IOException e) { |
| throw new ErrnoException("mmapRO", 1, e); |
| } |
| } |
| |
| @LayoutlibDelegate |
| static void close(MemoryMappedFile thisFile) throws ErrnoException { |
| Long index = sMemoryMappedFileMap.get(thisFile); |
| if (index != null) { |
| sMemoryMappedFileMap.remove(thisFile); |
| sManager.removeJavaReferenceFor(index); |
| } |
| } |
| |
| @LayoutlibDelegate |
| static BufferIterator bigEndianIterator(MemoryMappedFile file) { |
| MemoryMappedFile_Delegate delegate = getDelegate(file); |
| return new BridgeBufferIterator(delegate.mSize, delegate.mMappedByteBuffer.duplicate()); |
| } |
| |
| // TODO: implement littleEndianIterator() |
| |
| public MemoryMappedFile_Delegate(RandomAccessFile file) throws IOException { |
| mSize = file.length(); |
| // It's weird that map() takes size as long, but returns MappedByteBuffer which uses an int |
| // to store the marker to the position. |
| mMappedByteBuffer = file.getChannel().map(MapMode.READ_ONLY, 0, mSize); |
| assert mMappedByteBuffer.order() == ByteOrder.BIG_ENDIAN; |
| } |
| |
| public static void setDataDir(File path) { |
| sRootPath = path; |
| } |
| |
| private static MemoryMappedFile_Delegate getDelegate(MemoryMappedFile file) { |
| Long index = sMemoryMappedFileMap.get(file); |
| return index == null ? null : sManager.getDelegate(index); |
| } |
| |
| } |