151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski/* 22c87ad3a45cecf9e344487cad1abfdebe79f2c7cNarayan Kamath * Copyright (C) 2014 The Android Open Source Project 351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Copyright (c) 1994, 2013, Oracle and/or its affiliates. All rights reserved. 451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This code is free software; you can redistribute it and/or modify it 751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * under the terms of the GNU General Public License version 2 only, as 851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * published by the Free Software Foundation. Oracle designates this 951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * particular file as subject to the "Classpath" exception as provided 1051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * by Oracle in the LICENSE file that accompanied this code. 1151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This code is distributed in the hope that it will be useful, but WITHOUT 1351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * version 2 for more details (a copy is included in the LICENSE file that 1651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * accompanied this code). 1751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * You should have received a copy of the GNU General Public License version 1951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 2 along with this work; if not, write to the Free Software Foundation, 2051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 2151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 2251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or visit www.oracle.com if you need additional information or have any 2451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * questions. 2551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 2651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 2751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskipackage java.io; 2851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 2951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskiimport java.nio.channels.FileChannel; 3051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskiimport sun.nio.ch.FileChannelImpl; 318d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebskiimport android.system.ErrnoException; 328d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebskiimport dalvik.system.CloseGuard; 338d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebskiimport libcore.io.IoBridge; 34118de16ee0529955eaca8cc5ce864cac49598c86Shubham Ajmeraimport libcore.io.IoTracker; 358d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebskiimport libcore.io.Libcore; 368d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebskiimport static android.system.OsConstants.*; 3751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 3851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 3951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski/** 4051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Instances of this class support both reading and writing to a 4151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * random access file. A random access file behaves like a large 4251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * array of bytes stored in the file system. There is a kind of cursor, 4351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or index into the implied array, called the <em>file pointer</em>; 4451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * input operations read bytes starting at the file pointer and advance 4551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file pointer past the bytes read. If the random access file is 4651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * created in read/write mode, then output operations are also available; 4751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * output operations write bytes starting at the file pointer and advance 4851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file pointer past the bytes written. Output operations that write 4951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * past the current end of the implied array cause the array to be 5051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * extended. The file pointer can be read by the 511777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code getFilePointer} method and set by the {@code seek} 5251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * method. 5351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 5451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * It is generally true of all the reading routines in this class that 5551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * if end-of-file is reached before the desired number of bytes has been 561777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * read, an {@code EOFException} (which is a kind of 571777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code IOException}) is thrown. If any byte cannot be read for 581777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * any reason other than end-of-file, an {@code IOException} other 591777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * than {@code EOFException} is thrown. In particular, an 601777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code IOException} may be thrown if the stream has been closed. 6151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 6251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @author unascribed 6351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @since JDK1.0 6451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 6551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 6651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskipublic class RandomAccessFile implements DataOutput, DataInput, Closeable { 6751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 688d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski private final CloseGuard guard = CloseGuard.get(); 698d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski private final byte[] scratch = new byte[8]; 708d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski private boolean syncMetadata = false; 718d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski private int mode; 728d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 7351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private FileDescriptor fd; 7451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private FileChannel channel = null; 7551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private boolean rw; 7651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 771777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak /** 781777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * The path of the referenced file 791777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * (null if the stream is created with a file descriptor) 801777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak */ 8151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private final String path; 8251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 8351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private Object closeLock = new Object(); 8451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private volatile boolean closed = false; 85118de16ee0529955eaca8cc5ce864cac49598c86Shubham Ajmera /** 86118de16ee0529955eaca8cc5ce864cac49598c86Shubham Ajmera * A single tracker to track both read and write. The tracker resets when the operation 87118de16ee0529955eaca8cc5ce864cac49598c86Shubham Ajmera * performed is different from the operation last performed. 88118de16ee0529955eaca8cc5ce864cac49598c86Shubham Ajmera */ 89118de16ee0529955eaca8cc5ce864cac49598c86Shubham Ajmera private final IoTracker ioTracker = new IoTracker(); 9051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 9151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 9251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Creates a random access file stream to read from, and optionally 9351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * to write to, a file with the specified name. A new 9451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * {@link FileDescriptor} object is created to represent the 9551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * connection to the file. 9651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 9751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> The <tt>mode</tt> argument specifies the access mode with which the 9851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file is to be opened. The permitted values and their meanings are as 9951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * specified for the <a 10051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * href="#mode"><tt>RandomAccessFile(File,String)</tt></a> constructor. 10151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 10251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 1031777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * If there is a security manager, its {@code checkRead} method 1041777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * is called with the {@code name} argument 10551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * as its argument to see if read access to the file is allowed. 10651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the mode allows writing, the security manager's 1071777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code checkWrite} method 1081777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * is also called with the {@code name} argument 10951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * as its argument to see if write access to the file is allowed. 11051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 11151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param name the system-dependent filename 11251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param mode the access <a href="#mode">mode</a> 11351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IllegalArgumentException if the mode argument is not equal 11451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * to one of <tt>"r"</tt>, <tt>"rw"</tt>, <tt>"rws"</tt>, or 11551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>"rwd"</tt> 11651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception FileNotFoundException 11751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * if the mode is <tt>"r"</tt> but the given string does not 11851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * denote an existing regular file, or if the mode begins with 11951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>"rw"</tt> but the given string does not denote an 12051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * existing, writable regular file and a new regular file of 12151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * that name cannot be created, or if some other error occurs 12251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * while opening or creating the file 12351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception SecurityException if a security manager exists and its 1241777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code checkRead} method denies read access to the file 12551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or the mode is "rw" and the security manager's 1261777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code checkWrite} method denies write access to the file 12751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.SecurityException 12851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.SecurityManager#checkRead(java.lang.String) 12951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.SecurityManager#checkWrite(java.lang.String) 13051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @revised 1.4 13151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @spec JSR-51 13251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 13351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public RandomAccessFile(String name, String mode) 13451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throws FileNotFoundException 13551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski { 13651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski this(name != null ? new File(name) : null, mode); 13751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 13851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 13951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 14051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Creates a random access file stream to read from, and optionally to 14151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * write to, the file specified by the {@link File} argument. A new {@link 14251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * FileDescriptor} object is created to represent this file connection. 14351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1441777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * <p>The <a name="mode"><tt>mode</tt></a> argument specifies the access mode 14551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * in which the file is to be opened. The permitted values and their 14651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * meanings are: 14751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1481777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * <table summary="Access mode permitted values and meanings"> 1491777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * <tr><th align="left">Value</th><th align="left">Meaning</th></tr> 15051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tr><td valign="top"><tt>"r"</tt></td> 15151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <td> Open for reading only. Invoking any of the <tt>write</tt> 15251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * methods of the resulting object will cause an {@link 15351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * java.io.IOException} to be thrown. </td></tr> 15451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tr><td valign="top"><tt>"rw"</tt></td> 15551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <td> Open for reading and writing. If the file does not already 15651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * exist then an attempt will be made to create it. </td></tr> 15751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tr><td valign="top"><tt>"rws"</tt></td> 15851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <td> Open for reading and writing, as with <tt>"rw"</tt>, and also 15951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * require that every update to the file's content or metadata be 16051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * written synchronously to the underlying storage device. </td></tr> 16151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tr><td valign="top"><tt>"rwd" </tt></td> 16251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <td> Open for reading and writing, as with <tt>"rw"</tt>, and also 16351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * require that every update to the file's content be written 16451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * synchronously to the underlying storage device. </td></tr> 1651777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * </table> 16651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 16751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The <tt>"rws"</tt> and <tt>"rwd"</tt> modes work much like the {@link 16851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * java.nio.channels.FileChannel#force(boolean) force(boolean)} method of 16951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the {@link java.nio.channels.FileChannel} class, passing arguments of 17051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>true</tt> and <tt>false</tt>, respectively, except that they always 17151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * apply to every I/O operation and are therefore often more efficient. If 17251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file resides on a local storage device then when an invocation of a 17351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * method of this class returns it is guaranteed that all changes made to 17451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file by that invocation will have been written to that device. This 17551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is useful for ensuring that critical information is not lost in the 17651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * event of a system crash. If the file does not reside on a local device 17751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then no such guarantee is made. 17851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1791777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * <p>The <tt>"rwd"</tt> mode can be used to reduce the number of I/O 18051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * operations performed. Using <tt>"rwd"</tt> only requires updates to the 18151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file's content to be written to storage; using <tt>"rws"</tt> requires 18251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * updates to both the file's content and its metadata to be written, which 18351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * generally requires at least one more low-level I/O operation. 18451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1851777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * <p>If there is a security manager, its {@code checkRead} method is 1861777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * called with the pathname of the {@code file} argument as its 18751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * argument to see if read access to the file is allowed. If the mode 1881777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * allows writing, the security manager's {@code checkWrite} method is 18951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * also called with the path argument to see if write access to the file is 19051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * allowed. 19151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 19251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param file the file object 19351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param mode the access mode, as described 19451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <a href="#mode">above</a> 19551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IllegalArgumentException if the mode argument is not equal 19651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * to one of <tt>"r"</tt>, <tt>"rw"</tt>, <tt>"rws"</tt>, or 19751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>"rwd"</tt> 19851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception FileNotFoundException 19951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * if the mode is <tt>"r"</tt> but the given file object does 20051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * not denote an existing regular file, or if the mode begins 20151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * with <tt>"rw"</tt> but the given file object does not denote 20251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * an existing, writable regular file and a new regular file of 20351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * that name cannot be created, or if some other error occurs 20451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * while opening or creating the file 20551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception SecurityException if a security manager exists and its 2061777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code checkRead} method denies read access to the file 20751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or the mode is "rw" and the security manager's 2081777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code checkWrite} method denies write access to the file 20951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.SecurityManager#checkRead(java.lang.String) 21051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.SecurityManager#checkWrite(java.lang.String) 21151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.nio.channels.FileChannel#force(boolean) 21251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @revised 1.4 21351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @spec JSR-51 21451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 21551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public RandomAccessFile(File file, String mode) 21651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throws FileNotFoundException 21751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski { 21851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski String name = (file != null ? file.getPath() : null); 2198d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski this.mode = -1; 2208d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (mode.equals("r")) { 2218d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski this.mode = O_RDONLY; 2228d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } else if (mode.startsWith("rw")) { 2236975f84c2ed72e1e26d20190b6f318718c849008Tobias Thierer // Android-changed: Added. O_CREAT 2248d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski this.mode = O_RDWR | O_CREAT; 22551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski rw = true; 22651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (mode.length() > 2) { 2278d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (mode.equals("rws")) { 2288d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski syncMetadata = true; 2298d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } else if (mode.equals("rwd")) { 2306975f84c2ed72e1e26d20190b6f318718c849008Tobias Thierer // Android-changed: Should this be O_DSYNC and the above O_SYNC ? 2318d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski this.mode |= O_SYNC; 2328d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } else { 2338d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski this.mode = -1; 2348d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 23551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 23651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 2378d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 2388d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (this.mode < 0) { 23951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new IllegalArgumentException("Illegal mode \"" + mode 24051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski + "\" must be one of " 24151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski + "\"r\", \"rw\", \"rws\"," 24251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski + " or \"rwd\""); 24351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 2448d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 24551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (name == null) { 2468d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw new NullPointerException("file == null"); 24751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 2488d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 24951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (file.isInvalid()) { 25051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new FileNotFoundException("Invalid file path"); 25151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 25251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski this.path = name; 2538d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 2548d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // Android-changed: Use IoBridge.open() instead of open. 2558d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski fd = IoBridge.open(file.getPath(), this.mode); 2568d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (syncMetadata) { 2578d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 2588d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski fd.sync(); 2598d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } catch (IOException e) { 2608d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // Ignored 2618d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 2628d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 2638d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski guard.open("close"); 26451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 26551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 26651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 26751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the opaque file descriptor object associated with this 2681777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * stream. 26951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 27051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the file descriptor object associated with this stream. 27151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 27251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.io.FileDescriptor 27351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 27451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final FileDescriptor getFD() throws IOException { 2751777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak if (fd != null) { 2761777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak return fd; 2771777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak } 27851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new IOException(); 27951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 28051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 28151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 28251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the unique {@link java.nio.channels.FileChannel FileChannel} 28351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * object associated with this file. 28451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 28551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> The {@link java.nio.channels.FileChannel#position() 2861777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * position} of the returned channel will always be equal to 28751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * this object's file-pointer offset as returned by the {@link 28851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * #getFilePointer getFilePointer} method. Changing this object's 28951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file-pointer offset, whether explicitly or by reading or writing bytes, 29051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * will change the position of the channel, and vice versa. Changing the 29151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file's length via this object will change the length seen via the file 29251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * channel, and vice versa. 29351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 29451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the file channel associated with this file 29551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 29651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @since 1.4 29751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @spec JSR-51 29851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 29951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final FileChannel getChannel() { 30051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski synchronized (this) { 30151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (channel == null) { 3020f7f0c999e751ab883a247e1409dcc8730c87b9fPrzemyslaw Szczepaniak channel = FileChannelImpl.open(fd, path, true, rw, this); 30351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 30451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return channel; 30551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 30651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 30751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 30851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 30951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a byte of data from this file. The byte is returned as an 3101777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * integer in the range 0 to 255 ({@code 0x00-0x0ff}). This 31151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * method blocks if no input is yet available. 31251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 3131777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Although {@code RandomAccessFile} is not a subclass of 3141777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code InputStream}, this method behaves in exactly the same 31551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * way as the {@link InputStream#read()} method of 3161777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code InputStream}. 31751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 3181777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @return the next byte of data, or {@code -1} if the end of the 31951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file has been reached. 32051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. Not thrown if 32151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * end-of-file has been reached. 32251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 32351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int read() throws IOException { 3248d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski return (read(scratch, 0, 1) != -1) ? scratch[0] & 0xff : -1; 32551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 32651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 32751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 32851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a sub array as a sequence of bytes. 32951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the buffer into which the data is read. 33051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param off the start offset of the data. 33151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the number of bytes to read. 33251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException If an I/O error has occurred. 33351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 33451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private int readBytes(byte b[], int off, int len) throws IOException { 335118de16ee0529955eaca8cc5ce864cac49598c86Shubham Ajmera ioTracker.trackIo(len, IoTracker.Mode.READ); 3368d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski return IoBridge.read(fd, b, off, len); 33751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 33851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 33951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 3401777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Reads up to {@code len} bytes of data from this file into an 34151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * array of bytes. This method blocks until at least one byte of input 34251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is available. 34351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 3441777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Although {@code RandomAccessFile} is not a subclass of 3451777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code InputStream}, this method behaves in exactly the 34651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * same way as the {@link InputStream#read(byte[], int, int)} method of 3471777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code InputStream}. 34851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 34951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the buffer into which the data is read. 3501777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param off the start offset in array {@code b} 35151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * at which the data is written. 35251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the maximum number of bytes read. 35351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the total number of bytes read into the buffer, or 3541777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code -1} if there is no more data because the end of 35551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file has been reached. 35651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException If the first byte cannot be read for any reason 35751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * other than end of file, or if the random access file has been closed, or if 35851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * some other I/O error occurs. 3591777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @exception NullPointerException If {@code b} is {@code null}. 3601777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @exception IndexOutOfBoundsException If {@code off} is negative, 3611777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code len} is negative, or {@code len} is greater than 3621777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code b.length - off} 36351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 36451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int read(byte b[], int off, int len) throws IOException { 36551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return readBytes(b, off, len); 36651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 36751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 36851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 3691777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Reads up to {@code b.length} bytes of data from this file 37051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * into an array of bytes. This method blocks until at least one byte 37151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of input is available. 37251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 3731777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Although {@code RandomAccessFile} is not a subclass of 3741777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code InputStream}, this method behaves in exactly the 37551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * same way as the {@link InputStream#read(byte[])} method of 3761777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code InputStream}. 37751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 37851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the buffer into which the data is read. 37951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the total number of bytes read into the buffer, or 3801777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code -1} if there is no more data because the end of 38151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * this file has been reached. 38251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException If the first byte cannot be read for any reason 38351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * other than end of file, or if the random access file has been closed, or if 38451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * some other I/O error occurs. 3851777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @exception NullPointerException If {@code b} is {@code null}. 38651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 38751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int read(byte b[]) throws IOException { 38851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return readBytes(b, 0, b.length); 38951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 39051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 39151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 3921777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Reads {@code b.length} bytes from this file into the byte 39351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * array, starting at the current file pointer. This method reads 39451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * repeatedly from the file until the requested number of bytes are 39551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * read. This method blocks until the requested number of bytes are 39651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * read, the end of the stream is detected, or an exception is thrown. 39751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 39851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the buffer into which the data is read. 39951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 40051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * all the bytes. 40151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 40251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 40351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void readFully(byte b[]) throws IOException { 40451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski readFully(b, 0, b.length); 40551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 40651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 40751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 4081777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Reads exactly {@code len} bytes from this file into the byte 40951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * array, starting at the current file pointer. This method reads 41051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * repeatedly from the file until the requested number of bytes are 41151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * read. This method blocks until the requested number of bytes are 41251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * read, the end of the stream is detected, or an exception is thrown. 41351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 41451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the buffer into which the data is read. 41551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param off the start offset of the data. 41651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the number of bytes to read. 41751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 41851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * all the bytes. 41951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 42051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 42151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void readFully(byte b[], int off, int len) throws IOException { 42251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int n = 0; 42351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski do { 42451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int count = this.read(b, off + n, len - n); 42551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (count < 0) 42651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 42751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski n += count; 42851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } while (n < len); 42951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 43051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 43151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 4321777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Attempts to skip over {@code n} bytes of input discarding the 43351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * skipped bytes. 43451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 43551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 43651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method may skip over some smaller number of bytes, possibly zero. 43751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This may result from any of a number of conditions; reaching end of 4381777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * file before {@code n} bytes have been skipped is only one 4391777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * possibility. This method never throws an {@code EOFException}. 4401777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * The actual number of bytes skipped is returned. If {@code n} 44151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is negative, no bytes are skipped. 44251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 44351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param n the number of bytes to be skipped. 44451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the actual number of bytes skipped. 44551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 44651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 44751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int skipBytes(int n) throws IOException { 44851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski long pos; 44951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski long len; 45051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski long newpos; 45151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 45251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (n <= 0) { 45351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return 0; 45451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 45551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski pos = getFilePointer(); 45651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski len = length(); 45751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski newpos = pos + n; 45851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (newpos > len) { 45951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski newpos = len; 46051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 46151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski seek(newpos); 46251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 46351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /* return the actual number of bytes skipped */ 46451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (int) (newpos - pos); 46551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 46651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 46751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // 'Write' primitives 46851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 46951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 47051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes the specified byte to this file. The write starts at 47151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the current file pointer. 47251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 4731777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param b the {@code byte} to be written. 47451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 47551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 47651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void write(int b) throws IOException { 4778d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski scratch[0] = (byte) (b & 0xff); 4788d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski write(scratch, 0, 1); 47951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 48051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 48151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 48251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a sub array as a sequence of bytes. 48351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the data to be written 48451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param off the start offset in the data 48551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the number of bytes that are written 48651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException If an I/O error has occurred. 48751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 48851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private void writeBytes(byte b[], int off, int len) throws IOException { 489118de16ee0529955eaca8cc5ce864cac49598c86Shubham Ajmera ioTracker.trackIo(len, IoTracker.Mode.WRITE); 4908d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski IoBridge.write(fd, b, off, len); 4918d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // if we are in "rws" mode, attempt to sync file+metadata 4928d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (syncMetadata) { 4938d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski fd.sync(); 49451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 49551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 49651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 49751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 4981777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Writes {@code b.length} bytes from the specified byte array 49951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * to this file, starting at the current file pointer. 50051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 50151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the data. 50251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 50351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 50451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void write(byte b[]) throws IOException { 50551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeBytes(b, 0, b.length); 50651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 50751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 50851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 5091777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Writes {@code len} bytes from the specified byte array 5101777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * starting at offset {@code off} to this file. 51151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 51251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the data. 51351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param off the start offset in the data. 51451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the number of bytes to write. 51551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 51651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 51751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void write(byte b[], int off, int len) throws IOException { 51851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeBytes(b, off, len); 51951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 52051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 52151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // 'Random access' stuff 52251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 52351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 52451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the current offset in this file. 52551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 52651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the offset from the beginning of the file, in bytes, 52751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * at which the next read or write occurs. 52851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 52951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 5308d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski public long getFilePointer() throws IOException { 5318d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 5328d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski return Libcore.os.lseek(fd, 0L, SEEK_CUR); 5338d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } catch (ErrnoException errnoException) { 5348d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw errnoException.rethrowAsIOException(); 5358d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5368d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 53751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 53851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 53951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Sets the file-pointer offset, measured from the beginning of this 54051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file, at which the next read or write occurs. The offset may be 54151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * set beyond the end of the file. Setting the offset beyond the end 54251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of the file does not change the file length. The file length will 54351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * change only by writing after the offset has been set beyond the end 54451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of the file. 54551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 5469e78cee3f3edf84254174717f475605d712aad1cNarayan Kamath * @param offset the offset position, measured in bytes from the 54751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * beginning of the file, at which to set the file 54851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * pointer. 5491777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @exception IOException if {@code pos} is less than 5501777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code 0} or if an I/O error occurs. 55151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 5528d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski public void seek(long offset) throws IOException { 5538d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (offset < 0) { 5548d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw new IOException("offset < 0: " + offset); 5558d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5568d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 5578d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski Libcore.os.lseek(fd, offset, SEEK_SET); 558118de16ee0529955eaca8cc5ce864cac49598c86Shubham Ajmera ioTracker.reset(); 5598d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } catch (ErrnoException errnoException) { 5608d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw errnoException.rethrowAsIOException(); 5618d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5628d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 56351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 56451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 56551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the length of this file. 56651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 56751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the length of this file, measured in bytes. 56851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 56951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 5708d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski public long length() throws IOException { 5718d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 5728d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski return Libcore.os.fstat(fd).st_size; 5738d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } catch (ErrnoException errnoException) { 5748d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw errnoException.rethrowAsIOException(); 5758d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5768d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 57751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 57851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 57951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Sets the length of this file. 58051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 58151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> If the present length of the file as returned by the 5821777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code length} method is greater than the {@code newLength} 58351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * argument then the file will be truncated. In this case, if the file 5841777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * offset as returned by the {@code getFilePointer} method is greater 5851777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * than {@code newLength} then after this method returns the offset 5861777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * will be equal to {@code newLength}. 58751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 58851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> If the present length of the file as returned by the 5891777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code length} method is smaller than the {@code newLength} 59051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * argument then the file will be extended. In this case, the contents of 59151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the extended portion of the file are not defined. 59251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 59351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param newLength The desired length of the file 59451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException If an I/O error occurs 59551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @since 1.2 59651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 5978d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski public void setLength(long newLength) throws IOException { 5988d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (newLength < 0) { 5998d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw new IllegalArgumentException("newLength < 0"); 6008d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 6018d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 6028d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski Libcore.os.ftruncate(fd, newLength); 6038d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } catch (ErrnoException errnoException) { 6048d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw errnoException.rethrowAsIOException(); 6058d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 6068d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 6078d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski long filePointer = getFilePointer(); 6088d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (filePointer > newLength) { 6098d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski seek(newLength); 6108d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 6118d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // if we are in "rws" mode, attempt to sync file+metadata 6128d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (syncMetadata) { 6138d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski fd.sync(); 6148d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 6158d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 6168d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 61751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 61851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 61951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Closes this random access file stream and releases any system 62051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * resources associated with the stream. A closed random access 62151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file cannot perform input or output operations and cannot be 62251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * reopened. 62351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 62451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> If this file has an associated channel then the channel is closed 62551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * as well. 62651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 62751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 62851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 62951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @revised 1.4 63051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @spec JSR-51 63151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 63251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void close() throws IOException { 6338d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski guard.close(); 63451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski synchronized (closeLock) { 63551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (closed) { 63651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return; 63751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 63851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski closed = true; 63951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 6408d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 6418d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (channel != null && channel.isOpen()) { 64251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski channel.close(); 64351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 6448d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski IoBridge.closeAndSignalBlockedThreads(fd); 64551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 64651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 64751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // 64851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // Some "reading/writing Java data types" methods stolen from 64951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // DataInputStream and DataOutputStream. 65051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // 65151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 65251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 6531777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Reads a {@code boolean} from this file. This method reads a 65451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * single byte from the file, starting at the current file pointer. 6551777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * A value of {@code 0} represents 6561777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code false}. Any other value represents {@code true}. 65751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the byte is read, the end of the stream 65851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is detected, or an exception is thrown. 65951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 6601777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @return the {@code boolean} value read. 66151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file has reached the end. 66251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 66351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 66451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final boolean readBoolean() throws IOException { 66551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch = this.read(); 66651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (ch < 0) 66751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 66851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (ch != 0); 66951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 67051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 67151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 67251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a signed eight-bit value from this file. This method reads a 67351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * byte from the file, starting from the current file pointer. 6741777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * If the byte read is {@code b}, where 67551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>0 <= b <= 255</code>, 67651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then the result is: 67751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 67851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (byte)(b) 67951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 68051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 68151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the byte is read, the end of the stream 68251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is detected, or an exception is thrown. 68351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 68451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next byte of this file as a signed eight-bit 6851777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code byte}. 68651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file has reached the end. 68751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 68851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 68951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final byte readByte() throws IOException { 69051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch = this.read(); 69151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (ch < 0) 69251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 69351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (byte)(ch); 69451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 69551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 69651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 69751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads an unsigned eight-bit number from this file. This method reads 69851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * a byte from this file, starting at the current file pointer, 69951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * and returns that byte. 70051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 70151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the byte is read, the end of the stream 70251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is detected, or an exception is thrown. 70351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 70451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next byte of this file, interpreted as an unsigned 70551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * eight-bit number. 70651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file has reached the end. 70751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 70851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 70951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final int readUnsignedByte() throws IOException { 71051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch = this.read(); 71151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (ch < 0) 71251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 71351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return ch; 71451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 71551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 71651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 71751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a signed 16-bit number from this file. The method reads two 71851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * bytes from this file, starting at the current file pointer. 71951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the two bytes read, in order, are 7201777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code b1} and {@code b2}, where each of the two values is 7211777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * between {@code 0} and {@code 255}, inclusive, then the 72251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * result is equal to: 72351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 72451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (short)((b1 << 8) | b2) 72551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 72651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 72751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the two bytes are read, the end of the 72851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 72951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 73051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next two bytes of this file, interpreted as a signed 73151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 16-bit number. 73251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 73351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * two bytes. 73451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 73551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 73651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final short readShort() throws IOException { 73751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch1 = this.read(); 73851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch2 = this.read(); 73951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((ch1 | ch2) < 0) 74051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 74151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (short)((ch1 << 8) + (ch2 << 0)); 74251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 74351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 74451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 74551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads an unsigned 16-bit number from this file. This method reads 74651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * two bytes from the file, starting at the current file pointer. 74751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the bytes read, in order, are 7481777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code b1} and {@code b2}, where 74951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>0 <= b1, b2 <= 255</code>, 75051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then the result is equal to: 75151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 75251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (b1 << 8) | b2 75351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 75451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 75551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the two bytes are read, the end of the 75651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 75751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 75851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next two bytes of this file, interpreted as an unsigned 75951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 16-bit integer. 76051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 76151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * two bytes. 76251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 76351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 76451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final int readUnsignedShort() throws IOException { 76551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch1 = this.read(); 76651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch2 = this.read(); 76751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((ch1 | ch2) < 0) 76851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 76951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (ch1 << 8) + (ch2 << 0); 77051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 77151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 77251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 77351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a character from this file. This method reads two 77451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * bytes from the file, starting at the current file pointer. 77551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the bytes read, in order, are 7761777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code b1} and {@code b2}, where 77751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>0 <= b1, b2 <= 255</code>, 77851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then the result is equal to: 77951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 78051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (char)((b1 << 8) | b2) 78151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 78251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 78351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the two bytes are read, the end of the 78451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 78551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 78651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next two bytes of this file, interpreted as a 7871777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code char}. 78851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 78951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * two bytes. 79051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 79151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 79251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final char readChar() throws IOException { 79351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch1 = this.read(); 79451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch2 = this.read(); 79551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((ch1 | ch2) < 0) 79651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 79751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (char)((ch1 << 8) + (ch2 << 0)); 79851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 79951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 80051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 80151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a signed 32-bit integer from this file. This method reads 4 80251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * bytes from the file, starting at the current file pointer. 8031777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * If the bytes read, in order, are {@code b1}, 8041777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code b2}, {@code b3}, and {@code b4}, where 80551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>0 <= b1, b2, b3, b4 <= 255</code>, 80651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then the result is equal to: 80751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 80851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (b1 << 24) | (b2 << 16) + (b3 << 8) + b4 80951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 81051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 81151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the four bytes are read, the end of the 81251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 81351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 81451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next four bytes of this file, interpreted as an 8151777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code int}. 81651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 81751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * four bytes. 81851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 81951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 82051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final int readInt() throws IOException { 82151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch1 = this.read(); 82251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch2 = this.read(); 82351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch3 = this.read(); 82451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch4 = this.read(); 82551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((ch1 | ch2 | ch3 | ch4) < 0) 82651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 82751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + (ch4 << 0)); 82851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 82951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 83051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 83151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a signed 64-bit integer from this file. This method reads eight 83251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * bytes from the file, starting at the current file pointer. 83351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the bytes read, in order, are 8341777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code b1}, {@code b2}, {@code b3}, 8351777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code b4}, {@code b5}, {@code b6}, 8361777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code b7}, and {@code b8,} where: 83751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 83851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 0 <= b1, b2, b3, b4, b5, b6, b7, b8 <=255, 83951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 84051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 84151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then the result is equal to: 8421777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * <blockquote><pre> 84351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * ((long)b1 << 56) + ((long)b2 << 48) 84451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * + ((long)b3 << 40) + ((long)b4 << 32) 84551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * + ((long)b5 << 24) + ((long)b6 << 16) 84651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * + ((long)b7 << 8) + b8 84751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 84851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 84951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the eight bytes are read, the end of the 85051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 85151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 85251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next eight bytes of this file, interpreted as a 8531777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code long}. 85451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 85551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * eight bytes. 85651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 85751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 85851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final long readLong() throws IOException { 85951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return ((long)(readInt()) << 32) + (readInt() & 0xFFFFFFFFL); 86051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 86151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 86251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 8631777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Reads a {@code float} from this file. This method reads an 8641777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code int} value, starting at the current file pointer, 8651777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * as if by the {@code readInt} method 8661777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * and then converts that {@code int} to a {@code float} 8671777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * using the {@code intBitsToFloat} method in class 8681777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code Float}. 86951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 87051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the four bytes are read, the end of the 87151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 87251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 87351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next four bytes of this file, interpreted as a 8741777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code float}. 87551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 87651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * four bytes. 87751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 87851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.io.RandomAccessFile#readInt() 87951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.Float#intBitsToFloat(int) 88051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 88151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final float readFloat() throws IOException { 88251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return Float.intBitsToFloat(readInt()); 88351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 88451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 88551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 8861777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Reads a {@code double} from this file. This method reads a 8871777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code long} value, starting at the current file pointer, 8881777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * as if by the {@code readLong} method 8891777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * and then converts that {@code long} to a {@code double} 8901777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * using the {@code longBitsToDouble} method in 8911777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * class {@code Double}. 89251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 89351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the eight bytes are read, the end of the 89451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 89551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 89651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next eight bytes of this file, interpreted as a 8971777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code double}. 89851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 89951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * eight bytes. 90051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 90151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.io.RandomAccessFile#readLong() 90251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.Double#longBitsToDouble(long) 90351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 90451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final double readDouble() throws IOException { 90551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return Double.longBitsToDouble(readLong()); 90651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 90751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 90851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 90951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads the next line of text from this file. This method successively 91051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * reads bytes from the file, starting at the current file pointer, 91151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * until it reaches a line terminator or the end 91251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of the file. Each byte is converted into a character by taking the 91351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * byte's value for the lower eight bits of the character and setting the 91451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * high eight bits of the character to zero. This method does not, 91551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * therefore, support the full Unicode character set. 91651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 91751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> A line of text is terminated by a carriage-return character 9181777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * ({@code '\u005Cr'}), a newline character ({@code '\u005Cn'}), a 91951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * carriage-return character immediately followed by a newline character, 92051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or the end of the file. Line-terminating characters are discarded and 92151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * are not included as part of the string returned. 92251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 92351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> This method blocks until a newline character is read, a carriage 92451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * return and the byte following it are read (to see if it is a newline), 92551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the end of the file is reached, or an exception is thrown. 92651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 92751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next line of text from this file, or null if end 92851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of file is encountered before even one byte is read. 92951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 93051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 93151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 93251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final String readLine() throws IOException { 93351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski StringBuffer input = new StringBuffer(); 93451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int c = -1; 93551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski boolean eol = false; 93651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 93751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski while (!eol) { 93851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski switch (c = read()) { 93951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski case -1: 94051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski case '\n': 94151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski eol = true; 94251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski break; 94351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski case '\r': 94451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski eol = true; 94551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski long cur = getFilePointer(); 94651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((read()) != '\n') { 94751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski seek(cur); 94851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 94951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski break; 95051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski default: 95151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski input.append((char)c); 95251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski break; 95351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 95451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 95551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 95651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((c == -1) && (input.length() == 0)) { 95751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return null; 95851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 95951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return input.toString(); 96051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 96151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 96251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 96351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads in a string from this file. The string has been encoded 96451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * using a 96551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <a href="DataInput.html#modified-utf-8">modified UTF-8</a> 96651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * format. 96751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 96851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The first two bytes are read, starting from the current file 96951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * pointer, as if by 9701777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code readUnsignedShort}. This value gives the number of 97151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * following bytes that are in the encoded string, not 97251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the length of the resulting string. The following bytes are then 97351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * interpreted as bytes encoding characters in the modified UTF-8 format 97451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * and are converted into characters. 97551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 97651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until all the bytes are read, the end of the 97751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 97851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 97951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return a Unicode string. 98051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before 98151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * reading all the bytes. 98251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 98351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception UTFDataFormatException if the bytes do not represent 98451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * valid modified UTF-8 encoding of a Unicode string. 98551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.io.RandomAccessFile#readUnsignedShort() 98651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 98751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final String readUTF() throws IOException { 98851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return DataInputStream.readUTF(this); 98951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 99051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 99151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 9921777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Writes a {@code boolean} to the file as a one-byte value. The 9931777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * value {@code true} is written out as the value 9941777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code (byte)1}; the value {@code false} is written out 9951777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * as the value {@code (byte)0}. The write starts at 99651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the current position of the file pointer. 99751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 9981777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param v a {@code boolean} value to be written. 99951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 100051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 100151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeBoolean(boolean v) throws IOException { 100251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write(v ? 1 : 0); 100351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written++; 100451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 100551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 100651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 10071777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Writes a {@code byte} to the file as a one-byte value. The 100851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * write starts at the current position of the file pointer. 100951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 10101777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param v a {@code byte} value to be written. 101151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 101251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 101351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeByte(int v) throws IOException { 101451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write(v); 101551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written++; 101651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 101751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 101851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 10191777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Writes a {@code short} to the file as two bytes, high byte first. 102051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The write starts at the current position of the file pointer. 102151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 10221777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param v a {@code short} to be written. 102351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 102451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 102551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeShort(int v) throws IOException { 102651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 8) & 0xFF); 102751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 0) & 0xFF); 102851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written += 2; 102951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 103051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 103151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 10321777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Writes a {@code char} to the file as a two-byte value, high 103351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * byte first. The write starts at the current position of the 103451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file pointer. 103551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 10361777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param v a {@code char} value to be written. 103751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 103851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 103951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeChar(int v) throws IOException { 104051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 8) & 0xFF); 104151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 0) & 0xFF); 104251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written += 2; 104351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 104451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 104551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 10461777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Writes an {@code int} to the file as four bytes, high byte first. 104751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The write starts at the current position of the file pointer. 104851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 10491777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param v an {@code int} to be written. 105051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 105151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 105251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeInt(int v) throws IOException { 105351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 24) & 0xFF); 105451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 16) & 0xFF); 105551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 8) & 0xFF); 105651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 0) & 0xFF); 105751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written += 4; 105851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 105951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 106051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 10611777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Writes a {@code long} to the file as eight bytes, high byte first. 106251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The write starts at the current position of the file pointer. 106351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 10641777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param v a {@code long} to be written. 106551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 106651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 106751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeLong(long v) throws IOException { 106851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 56) & 0xFF); 106951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 48) & 0xFF); 107051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 40) & 0xFF); 107151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 32) & 0xFF); 107251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 24) & 0xFF); 107351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 16) & 0xFF); 107451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 8) & 0xFF); 107551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 0) & 0xFF); 107651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written += 8; 107751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 107851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 107951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 10801777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Converts the float argument to an {@code int} using the 10811777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code floatToIntBits} method in class {@code Float}, 10821777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * and then writes that {@code int} value to the file as a 108351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * four-byte quantity, high byte first. The write starts at the 108451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * current position of the file pointer. 108551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 10861777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param v a {@code float} value to be written. 108751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 108851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.Float#floatToIntBits(float) 108951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 109051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeFloat(float v) throws IOException { 109151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeInt(Float.floatToIntBits(v)); 109251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 109351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 109451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 10951777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Converts the double argument to a {@code long} using the 10961777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code doubleToLongBits} method in class {@code Double}, 10971777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * and then writes that {@code long} value to the file as an 109851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * eight-byte quantity, high byte first. The write starts at the current 109951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * position of the file pointer. 110051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 11011777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param v a {@code double} value to be written. 110251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 110351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.Double#doubleToLongBits(double) 110451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 110551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeDouble(double v) throws IOException { 110651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeLong(Double.doubleToLongBits(v)); 110751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 110851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 110951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 111051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes the string to the file as a sequence of bytes. Each 111151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * character in the string is written out, in sequence, by discarding 111251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * its high eight bits. The write starts at the current position of 111351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file pointer. 111451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 111551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param s a string of bytes to be written. 111651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 111751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 11181777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak @SuppressWarnings("deprecation") 111951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeBytes(String s) throws IOException { 112051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int len = s.length(); 112151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski byte[] b = new byte[len]; 112251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski s.getBytes(0, len, b, 0); 112351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeBytes(b, 0, len); 112451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 112551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 112651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 112751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a string to the file as a sequence of characters. Each 112851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * character is written to the data output stream as if by the 11291777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code writeChar} method. The write starts at the current 113051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * position of the file pointer. 113151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 11321777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param s a {@code String} value to be written. 113351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 113451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.io.RandomAccessFile#writeChar(int) 113551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 113651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeChars(String s) throws IOException { 113751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int clen = s.length(); 113851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int blen = 2*clen; 113951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski byte[] b = new byte[blen]; 114051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski char[] c = new char[clen]; 114151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski s.getChars(0, clen, c, 0); 114251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski for (int i = 0, j = 0; i < clen; i++) { 114351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski b[j++] = (byte)(c[i] >>> 8); 114451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski b[j++] = (byte)(c[i] >>> 0); 114551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 114651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeBytes(b, 0, blen); 114751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 114851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 114951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 115051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a string to the file using 115151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <a href="DataInput.html#modified-utf-8">modified UTF-8</a> 115251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * encoding in a machine-independent manner. 115351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 115451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * First, two bytes are written to the file, starting at the 115551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * current file pointer, as if by the 11561777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code writeShort} method giving the number of bytes to 115751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * follow. This value is the number of bytes actually written out, 115851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * not the length of the string. Following the length, each character 115951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of the string is output, in sequence, using the modified UTF-8 encoding 116051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * for each character. 116151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 116251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param str a string to be written. 116351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 116451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 116551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeUTF(String str) throws IOException { 116651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski DataOutputStream.writeUTF(str, this); 116751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 116851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 11698d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski @Override protected void finalize() throws Throwable { 11708d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 11718d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (guard != null) { 11728d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski guard.warnIfOpen(); 11738d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 11748d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski close(); 11758d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } finally { 11768d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski super.finalize(); 11778d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 117851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 117951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski} 1180