586 lines
23 KiB
Java
586 lines
23 KiB
Java
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/*
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* Copyright (C) 2014 The Android Open Source Project
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* Copyright (c) 1994, 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.io;
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import static android.system.OsConstants.O_APPEND;
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import static android.system.OsConstants.O_CREAT;
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import static android.system.OsConstants.O_TRUNC;
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import static android.system.OsConstants.O_WRONLY;
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import java.nio.channels.FileChannel;
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import jdk.internal.access.SharedSecrets;
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import jdk.internal.access.JavaIOFileDescriptorAccess;
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import sun.nio.ch.FileChannelImpl;
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import dalvik.annotation.optimization.ReachabilitySensitive;
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import dalvik.system.BlockGuard;
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import dalvik.system.CloseGuard;
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import libcore.io.IoBridge;
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import libcore.io.IoTracker;
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import libcore.io.IoUtils;
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/**
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* A file output stream is an output stream for writing data to a
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* {@code File} or to a {@code FileDescriptor}. Whether or not
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* a file is available or may be created depends upon the underlying
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* platform. Some platforms, in particular, allow a file to be opened
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* for writing by only one {@code FileOutputStream} (or other
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* file-writing object) at a time. In such situations the constructors in
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* this class will fail if the file involved is already open.
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*
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* <p>{@code FileOutputStream} is meant for writing streams of raw bytes
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* such as image data. For writing streams of characters, consider using
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* {@code FileWriter}.
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*
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* @apiNote
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* To release resources used by this stream {@link #close} should be called
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* directly or by try-with-resources. Subclasses are responsible for the cleanup
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* of resources acquired by the subclass.
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* Subclasses that override {@link #finalize} in order to perform cleanup
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* should be modified to use alternative cleanup mechanisms such as
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* {@link java.lang.ref.Cleaner} and remove the overriding {@code finalize} method.
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*
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* @implSpec
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* If this FileOutputStream has been subclassed and the {@link #close}
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* method has been overridden, the {@link #close} method will be
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* called when the FileInputStream is unreachable.
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* Otherwise, it is implementation specific how the resource cleanup described in
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* {@link #close} is performed.
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*
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* @author Arthur van Hoff
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* @see java.io.File
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* @see java.io.FileDescriptor
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* @see java.io.FileInputStream
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* @see java.nio.file.Files#newOutputStream
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* @since 1.0
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*/
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public class FileOutputStream extends OutputStream
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{
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/**
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* Access to FileDescriptor internals.
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*/
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// Android-removed: Remove unused fdAccess.
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// private static final JavaIOFileDescriptorAccess fdAccess =
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// SharedSecrets.getJavaIOFileDescriptorAccess();
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/**
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* The system dependent file descriptor.
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*/
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// Android-added: @ReachabilitySensitive
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@ReachabilitySensitive
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private final FileDescriptor fd;
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/**
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* The associated channel, initialized lazily.
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*/
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private volatile FileChannel channel;
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/**
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* The path of the referenced file
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* (null if the stream is created with a file descriptor)
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*/
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private final String path;
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private final Object closeLock = new Object();
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private volatile boolean closed;
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// Android-added: CloseGuard support: Log if the stream is not closed.
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@ReachabilitySensitive
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private final CloseGuard guard = CloseGuard.get();
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// Android-added: Field for tracking whether the stream owns the underlying FileDescriptor.
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private final boolean isFdOwner;
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// Android-added: Tracking of unbuffered I/O.
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private final IoTracker tracker = new IoTracker();
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/**
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* Creates a file output stream to write to the file with the
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* specified name. A new {@code FileDescriptor} object is
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* created to represent this file connection.
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* <p>
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* First, if there is a security manager, its {@code checkWrite}
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* method is called with {@code name} as its argument.
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* <p>
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* If the file exists but is a directory rather than a regular file, does
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* not exist but cannot be created, or cannot be opened for any other
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* reason then a {@code FileNotFoundException} is thrown.
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*
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* @implSpec Invoking this constructor with the parameter {@code name} is
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* equivalent to invoking {@link #FileOutputStream(String,boolean)
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* new FileOutputStream(name, false)}.
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*
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* @param name the system-dependent filename
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* @throws FileNotFoundException if the file exists but is a directory
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* rather than a regular file, does not exist but cannot
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* be created, or cannot be opened for any other reason
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* @throws SecurityException if a security manager exists and its
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* {@code checkWrite} method denies write access
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* to the file.
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* @see java.lang.SecurityManager#checkWrite(java.lang.String)
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*/
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public FileOutputStream(String name) throws FileNotFoundException {
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this(name != null ? new File(name) : null, false);
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}
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/**
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* Creates a file output stream to write to the file with the specified
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* name. If the second argument is {@code true}, then
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* bytes will be written to the end of the file rather than the beginning.
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* A new {@code FileDescriptor} object is created to represent this
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* file connection.
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* <p>
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* First, if there is a security manager, its {@code checkWrite}
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* method is called with {@code name} as its argument.
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* <p>
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* If the file exists but is a directory rather than a regular file, does
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* not exist but cannot be created, or cannot be opened for any other
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* reason then a {@code FileNotFoundException} is thrown.
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*
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* @param name the system-dependent file name
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* @param append if {@code true}, then bytes will be written
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* to the end of the file rather than the beginning
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* @throws FileNotFoundException if the file exists but is a directory
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* rather than a regular file, does not exist but cannot
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* be created, or cannot be opened for any other reason.
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* @throws SecurityException if a security manager exists and its
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* {@code checkWrite} method denies write access
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* to the file.
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* @see java.lang.SecurityManager#checkWrite(java.lang.String)
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* @since 1.1
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*/
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public FileOutputStream(String name, boolean append)
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throws FileNotFoundException
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{
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this(name != null ? new File(name) : null, append);
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}
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/**
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* Creates a file output stream to write to the file represented by
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* the specified {@code File} object. A new
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* {@code FileDescriptor} object is created to represent this
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* file connection.
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* <p>
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* First, if there is a security manager, its {@code checkWrite}
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* method is called with the path represented by the {@code file}
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* argument as its argument.
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* <p>
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* If the file exists but is a directory rather than a regular file, does
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* not exist but cannot be created, or cannot be opened for any other
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* reason then a {@code FileNotFoundException} is thrown.
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*
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* @param file the file to be opened for writing.
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* @throws FileNotFoundException if the file exists but is a directory
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* rather than a regular file, does not exist but cannot
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* be created, or cannot be opened for any other reason
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* @throws SecurityException if a security manager exists and its
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* {@code checkWrite} method denies write access
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* to the file.
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* @see java.io.File#getPath()
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* @see java.lang.SecurityException
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* @see java.lang.SecurityManager#checkWrite(java.lang.String)
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*/
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public FileOutputStream(File file) throws FileNotFoundException {
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this(file, false);
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}
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/**
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* Creates a file output stream to write to the file represented by
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* the specified {@code File} object. If the second argument is
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* {@code true}, then bytes will be written to the end of the file
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* rather than the beginning. A new {@code FileDescriptor} object is
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* created to represent this file connection.
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* <p>
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* First, if there is a security manager, its {@code checkWrite}
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* method is called with the path represented by the {@code file}
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* argument as its argument.
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* <p>
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* If the file exists but is a directory rather than a regular file, does
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* not exist but cannot be created, or cannot be opened for any other
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* reason then a {@code FileNotFoundException} is thrown.
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*
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* @param file the file to be opened for writing.
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* @param append if {@code true}, then bytes will be written
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* to the end of the file rather than the beginning
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* @throws FileNotFoundException if the file exists but is a directory
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* rather than a regular file, does not exist but cannot
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* be created, or cannot be opened for any other reason
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* @throws SecurityException if a security manager exists and its
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* {@code checkWrite} method denies write access
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* to the file.
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* @see java.io.File#getPath()
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* @see java.lang.SecurityException
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* @see java.lang.SecurityManager#checkWrite(java.lang.String)
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* @since 1.4
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*/
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public FileOutputStream(File file, boolean append)
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throws FileNotFoundException
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{
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String name = (file != null ? file.getPath() : null);
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@SuppressWarnings("removal")
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SecurityManager security = System.getSecurityManager();
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if (security != null) {
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security.checkWrite(name);
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}
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if (name == null) {
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throw new NullPointerException();
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}
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if (file.isInvalid()) {
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throw new FileNotFoundException("Invalid file path");
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}
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// BEGIN Android-changed: Open files using IoBridge to share BlockGuard & StrictMode logic.
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// http://b/111268862
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// this.fd = new FileDescriptor();
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int flags = O_WRONLY | O_CREAT | (append ? O_APPEND : O_TRUNC);
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this.fd = IoBridge.open(name, flags);
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// END Android-changed: Open files using IoBridge to share BlockGuard & StrictMode logic.
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// Android-changed: Tracking mechanism for FileDescriptor sharing.
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// fd.attach(this);
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this.isFdOwner = true;
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this.path = name;
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// Android-removed: Open files using IoBridge to share BlockGuard & StrictMode logic.
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// open(name, append);
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// Android-added: File descriptor ownership tracking.
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IoUtils.setFdOwner(this.fd, this);
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// Android-added: CloseGuard support.
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guard.open("close");
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// Android-removed: TODO: Enable this when FileCleanable is imported to replace finalize().
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// FileCleanable.register(fd); // open sets the fd, register the cleanup
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}
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// Android-removed: Documentation around SecurityException. Not thrown on Android.
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// Android-changed: Added doc for the Android-specific file descriptor ownership.
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/**
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* Creates a file output stream to write to the specified file
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* descriptor, which represents an existing connection to an actual
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* file in the file system.
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* <p>
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* First, if there is a security manager, its {@code checkWrite}
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* method is called with the file descriptor {@code fdObj}
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* argument as its argument.
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* <p>
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* If {@code fdObj} is null then a {@code NullPointerException}
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* is thrown.
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* <p>
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* This constructor does not throw an exception if {@code fdObj}
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* is {@link java.io.FileDescriptor#valid() invalid}.
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* However, if the methods are invoked on the resulting stream to attempt
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* I/O on the stream, an {@code IOException} is thrown.
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*
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* @param fdObj the file descriptor to be opened for writing
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* @throws SecurityException if a security manager exists and its
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* {@code checkWrite} method denies
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* write access to the file descriptor
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* @see java.lang.SecurityManager#checkWrite(java.io.FileDescriptor)
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*/
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public FileOutputStream(FileDescriptor fdObj) {
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// Android-changed: Delegate to added hidden constructor.
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this(fdObj, false /* isOwner */);
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}
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// Android-added: Internal/hidden constructor for specifying FileDescriptor ownership.
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// Android-removed: SecurityManager calls.
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/**
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* Internal constructor for {@code FileOutputStream} objects where the file descriptor
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* is owned by this tream.
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*
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* @hide
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*/
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public FileOutputStream(FileDescriptor fdObj, boolean isFdOwner) {
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if (fdObj == null) {
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// Android-changed: Improved NullPointerException message.
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throw new NullPointerException("fdObj == null");
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}
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this.fd = fdObj;
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this.path = null;
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// Android-changed: FileDescriptor ownership tracking mechanism.
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// fd.attach(this);
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this.isFdOwner = isFdOwner;
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if (isFdOwner) {
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IoUtils.setFdOwner(this.fd, this);
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}
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}
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// BEGIN Android-changed: Open files using IoBridge to share BlockGuard & StrictMode logic.
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// http://b/112107427
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/*
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/**
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* Opens a file, with the specified name, for overwriting or appending.
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* @param name name of file to be opened
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* @param append whether the file is to be opened in append mode
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*
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private native void open0(String name, boolean append)
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throws FileNotFoundException;
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// wrap native call to allow instrumentation
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/**
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* Opens a file, with the specified name, for overwriting or appending.
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* @param name name of file to be opened
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* @param append whether the file is to be opened in append mode
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*
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private void open(String name, boolean append)
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throws FileNotFoundException {
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open0(name, append);
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}
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*/
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// END Android-changed: Open files using IoBridge to share BlockGuard & StrictMode logic.
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// Android-removed: write(int, boolean), use IoBridge instead.
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/*
|
||
|
|
/**
|
||
|
|
* Writes the specified byte to this file output stream.
|
||
|
|
*
|
||
|
|
* @param b the byte to be written.
|
||
|
|
* @param append {@code true} if the write operation first
|
||
|
|
* advances the position to the end of file
|
||
|
|
*
|
||
|
|
private native void write(int b, boolean append) throws IOException;
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Writes the specified byte to this file output stream. Implements
|
||
|
|
* the {@code write} method of {@code OutputStream}.
|
||
|
|
*
|
||
|
|
* @param b the byte to be written.
|
||
|
|
* @throws IOException if an I/O error occurs.
|
||
|
|
*/
|
||
|
|
public void write(int b) throws IOException {
|
||
|
|
// Android-changed: Write methods delegate to write(byte[],int,int) to share Android logic.
|
||
|
|
// write(b, fdAccess.getAppend(fd));
|
||
|
|
write(new byte[] { (byte) b }, 0, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Android-removed: Write methods delegate to write(byte[],int,int) to share Android logic.
|
||
|
|
/*
|
||
|
|
/**
|
||
|
|
* Writes a sub array as a sequence of bytes.
|
||
|
|
* @param b the data to be written
|
||
|
|
* @param off the start offset in the data
|
||
|
|
* @param len the number of bytes that are written
|
||
|
|
* @param append {@code true} to first advance the position to the
|
||
|
|
* end of file
|
||
|
|
* @throws IOException If an I/O error has occurred.
|
||
|
|
*
|
||
|
|
private native void writeBytes(byte b[], int off, int len, boolean append)
|
||
|
|
throws IOException;
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Writes {@code b.length} bytes from the specified byte array
|
||
|
|
* to this file output stream.
|
||
|
|
*
|
||
|
|
* @param b the data.
|
||
|
|
* @throws IOException if an I/O error occurs.
|
||
|
|
*/
|
||
|
|
public void write(byte b[]) throws IOException {
|
||
|
|
// Android-changed: Write methods delegate to write(byte[],int,int) to share Android logic.
|
||
|
|
// writeBytes(b, 0, b.length, fdAccess.getAppend(fd));
|
||
|
|
write(b, 0, b.length);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Writes {@code len} bytes from the specified byte array
|
||
|
|
* starting at offset {@code off} to this file output stream.
|
||
|
|
*
|
||
|
|
* @param b the data.
|
||
|
|
* @param off the start offset in the data.
|
||
|
|
* @param len the number of bytes to write.
|
||
|
|
* @throws IOException if an I/O error occurs.
|
||
|
|
*/
|
||
|
|
public void write(byte b[], int off, int len) throws IOException {
|
||
|
|
// Android-added: close() check before I/O.
|
||
|
|
if (closed && len > 0) {
|
||
|
|
throw new IOException("Stream Closed");
|
||
|
|
}
|
||
|
|
|
||
|
|
// Android-added: Tracking of unbuffered I/O.
|
||
|
|
tracker.trackIo(len, IoTracker.Mode.WRITE);
|
||
|
|
|
||
|
|
// Android-changed: Use IoBridge instead of calling native method.
|
||
|
|
// writeBytes(b, off, len, fdAccess.getAppend(fd));
|
||
|
|
IoBridge.write(fd, b, off, len);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Closes this file output stream and releases any system resources
|
||
|
|
* associated with this stream. This file output stream may no longer
|
||
|
|
* be used for writing bytes.
|
||
|
|
*
|
||
|
|
* <p> If this stream has an associated channel then the channel is closed
|
||
|
|
* as well.
|
||
|
|
*
|
||
|
|
* @apiNote
|
||
|
|
* Overriding {@link #close} to perform cleanup actions is reliable
|
||
|
|
* only when called directly or when called by try-with-resources.
|
||
|
|
* Do not depend on finalization to invoke {@code close};
|
||
|
|
* finalization is not reliable and is deprecated.
|
||
|
|
* If cleanup of native resources is needed, other mechanisms such as
|
||
|
|
* {@linkplain java.lang.ref.Cleaner} should be used.
|
||
|
|
*
|
||
|
|
* @throws IOException if an I/O error occurs.
|
||
|
|
*
|
||
|
|
* @revised 1.4
|
||
|
|
*/
|
||
|
|
public void close() throws IOException {
|
||
|
|
if (closed) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
synchronized (closeLock) {
|
||
|
|
if (closed) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
closed = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Android-added: CloseGuard support.
|
||
|
|
guard.close();
|
||
|
|
|
||
|
|
if (channel != null) {
|
||
|
|
channel.close();
|
||
|
|
}
|
||
|
|
|
||
|
|
// BEGIN Android-changed: Close handling / notification of blocked threads.
|
||
|
|
/*
|
||
|
|
fd.closeAll(new Closeable() {
|
||
|
|
public void close() throws IOException {
|
||
|
|
fd.close();
|
||
|
|
}
|
||
|
|
});
|
||
|
|
*/
|
||
|
|
if (isFdOwner) {
|
||
|
|
IoBridge.closeAndSignalBlockedThreads(fd);
|
||
|
|
}
|
||
|
|
// END Android-changed: Close handling / notification of blocked threads.
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns the file descriptor associated with this stream.
|
||
|
|
*
|
||
|
|
* @return the {@code FileDescriptor} object that represents
|
||
|
|
* the connection to the file in the file system being used
|
||
|
|
* by this {@code FileOutputStream} object.
|
||
|
|
*
|
||
|
|
* @throws IOException if an I/O error occurs.
|
||
|
|
* @see java.io.FileDescriptor
|
||
|
|
*/
|
||
|
|
// Android-added: @ReachabilitySensitive
|
||
|
|
@ReachabilitySensitive
|
||
|
|
public final FileDescriptor getFD() throws IOException {
|
||
|
|
if (fd != null) {
|
||
|
|
return fd;
|
||
|
|
}
|
||
|
|
throw new IOException();
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns the unique {@link java.nio.channels.FileChannel FileChannel}
|
||
|
|
* object associated with this file output stream.
|
||
|
|
*
|
||
|
|
* <p> The initial {@link java.nio.channels.FileChannel#position()
|
||
|
|
* position} of the returned channel will be equal to the
|
||
|
|
* number of bytes written to the file so far unless this stream is in
|
||
|
|
* append mode, in which case it will be equal to the size of the file.
|
||
|
|
* Writing bytes to this stream will increment the channel's position
|
||
|
|
* accordingly. Changing the channel's position, either explicitly or by
|
||
|
|
* writing, will change this stream's file position.
|
||
|
|
*
|
||
|
|
* @return the file channel associated with this file output stream
|
||
|
|
*
|
||
|
|
* @since 1.4
|
||
|
|
*/
|
||
|
|
public FileChannel getChannel() {
|
||
|
|
FileChannel fc = this.channel;
|
||
|
|
if (fc == null) {
|
||
|
|
synchronized (this) {
|
||
|
|
fc = this.channel;
|
||
|
|
if (fc == null) {
|
||
|
|
this.channel = fc = FileChannelImpl.open(fd, path, false,
|
||
|
|
// Android-changed: TODO: remove patch when FileChannelImpl supports direct.
|
||
|
|
// This patch should cause no behavior change as direct is off by default.
|
||
|
|
// true, false, this);
|
||
|
|
true, this);
|
||
|
|
if (closed) {
|
||
|
|
try {
|
||
|
|
// possible race with close(), benign since
|
||
|
|
// FileChannel.close is final and idempotent
|
||
|
|
fc.close();
|
||
|
|
} catch (IOException ioe) {
|
||
|
|
throw new InternalError(ioe); // should not happen
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return fc;
|
||
|
|
}
|
||
|
|
|
||
|
|
// TODO: Remove finalize() when FileCleanable is imported and used.
|
||
|
|
/**
|
||
|
|
* Cleans up the connection to the file, and ensures that the
|
||
|
|
* <code>close</code> method of this file output stream is
|
||
|
|
* called when there are no more references to this stream.
|
||
|
|
*
|
||
|
|
* @exception IOException if an I/O error occurs.
|
||
|
|
* @see java.io.FileInputStream#close()
|
||
|
|
*/
|
||
|
|
protected void finalize() throws IOException {
|
||
|
|
// Android-added: CloseGuard support.
|
||
|
|
if (guard != null) {
|
||
|
|
guard.warnIfOpen();
|
||
|
|
}
|
||
|
|
|
||
|
|
if (fd != null) {
|
||
|
|
if (fd == FileDescriptor.out || fd == FileDescriptor.err) {
|
||
|
|
flush();
|
||
|
|
} else {
|
||
|
|
// Android-removed: Obsoleted comment about shared FileDescriptor handling.
|
||
|
|
close();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// BEGIN Android-removed: Unused code.
|
||
|
|
/*
|
||
|
|
private native void close0() throws IOException;
|
||
|
|
|
||
|
|
private static native void initIDs();
|
||
|
|
|
||
|
|
static {
|
||
|
|
initIDs();
|
||
|
|
}
|
||
|
|
*/
|
||
|
|
// END Android-removed: Unused code.
|
||
|
|
|
||
|
|
}
|