RandomAccessFile.java revision 1777d314864b48924136822b29aabffeb8a367c1
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; 348d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebskiimport libcore.io.Libcore; 358d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebskiimport static android.system.OsConstants.*; 3651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 3751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 3851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski/** 3951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Instances of this class support both reading and writing to a 4051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * random access file. A random access file behaves like a large 4151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * array of bytes stored in the file system. There is a kind of cursor, 4251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or index into the implied array, called the <em>file pointer</em>; 4351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * input operations read bytes starting at the file pointer and advance 4451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file pointer past the bytes read. If the random access file is 4551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * created in read/write mode, then output operations are also available; 4651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * output operations write bytes starting at the file pointer and advance 4751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file pointer past the bytes written. Output operations that write 4851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * past the current end of the implied array cause the array to be 4951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * extended. The file pointer can be read by the 501777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code getFilePointer} method and set by the {@code seek} 5151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * method. 5251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 5351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * It is generally true of all the reading routines in this class that 5451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * if end-of-file is reached before the desired number of bytes has been 551777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * read, an {@code EOFException} (which is a kind of 561777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code IOException}) is thrown. If any byte cannot be read for 571777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * any reason other than end-of-file, an {@code IOException} other 581777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * than {@code EOFException} is thrown. In particular, an 591777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code IOException} may be thrown if the stream has been closed. 6051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 6151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @author unascribed 6251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @since JDK1.0 6351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 6451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 6551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskipublic class RandomAccessFile implements DataOutput, DataInput, Closeable { 6651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 678d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski private final CloseGuard guard = CloseGuard.get(); 688d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski private final byte[] scratch = new byte[8]; 698d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski private boolean syncMetadata = false; 708d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski private int mode; 718d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 7251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private FileDescriptor fd; 7351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private FileChannel channel = null; 7451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private boolean rw; 7551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 761777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak /** 771777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * The path of the referenced file 781777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * (null if the stream is created with a file descriptor) 791777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak */ 8051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private final String path; 8151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 8251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private Object closeLock = new Object(); 8351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private volatile boolean closed = false; 8451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 8551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 8651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Creates a random access file stream to read from, and optionally 8751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * to write to, a file with the specified name. A new 8851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * {@link FileDescriptor} object is created to represent the 8951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * connection to the file. 9051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 9151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> The <tt>mode</tt> argument specifies the access mode with which the 9251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file is to be opened. The permitted values and their meanings are as 9351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * specified for the <a 9451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * href="#mode"><tt>RandomAccessFile(File,String)</tt></a> constructor. 9551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 9651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 971777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * If there is a security manager, its {@code checkRead} method 981777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * is called with the {@code name} argument 9951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * as its argument to see if read access to the file is allowed. 10051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the mode allows writing, the security manager's 1011777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code checkWrite} method 1021777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * is also called with the {@code name} argument 10351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * as its argument to see if write access to the file is allowed. 10451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 10551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param name the system-dependent filename 10651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param mode the access <a href="#mode">mode</a> 10751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IllegalArgumentException if the mode argument is not equal 10851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * to one of <tt>"r"</tt>, <tt>"rw"</tt>, <tt>"rws"</tt>, or 10951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>"rwd"</tt> 11051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception FileNotFoundException 11151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * if the mode is <tt>"r"</tt> but the given string does not 11251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * denote an existing regular file, or if the mode begins with 11351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>"rw"</tt> but the given string does not denote an 11451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * existing, writable regular file and a new regular file of 11551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * that name cannot be created, or if some other error occurs 11651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * while opening or creating the file 11751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception SecurityException if a security manager exists and its 1181777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code checkRead} method denies read access to the file 11951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or the mode is "rw" and the security manager's 1201777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code checkWrite} method denies write access to the file 12151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.SecurityException 12251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.SecurityManager#checkRead(java.lang.String) 12351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.SecurityManager#checkWrite(java.lang.String) 12451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @revised 1.4 12551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @spec JSR-51 12651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 12751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public RandomAccessFile(String name, String mode) 12851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throws FileNotFoundException 12951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski { 13051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski this(name != null ? new File(name) : null, mode); 13151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 13251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 13351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 13451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Creates a random access file stream to read from, and optionally to 13551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * write to, the file specified by the {@link File} argument. A new {@link 13651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * FileDescriptor} object is created to represent this file connection. 13751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1381777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * <p>The <a name="mode"><tt>mode</tt></a> argument specifies the access mode 13951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * in which the file is to be opened. The permitted values and their 14051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * meanings are: 14151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1421777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * <table summary="Access mode permitted values and meanings"> 1431777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * <tr><th align="left">Value</th><th align="left">Meaning</th></tr> 14451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tr><td valign="top"><tt>"r"</tt></td> 14551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <td> Open for reading only. Invoking any of the <tt>write</tt> 14651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * methods of the resulting object will cause an {@link 14751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * java.io.IOException} to be thrown. </td></tr> 14851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tr><td valign="top"><tt>"rw"</tt></td> 14951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <td> Open for reading and writing. If the file does not already 15051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * exist then an attempt will be made to create it. </td></tr> 15151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tr><td valign="top"><tt>"rws"</tt></td> 15251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <td> Open for reading and writing, as with <tt>"rw"</tt>, and also 15351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * require that every update to the file's content or metadata be 15451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * written synchronously to the underlying storage device. </td></tr> 15551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tr><td valign="top"><tt>"rwd" </tt></td> 15651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <td> Open for reading and writing, as with <tt>"rw"</tt>, and also 15751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * require that every update to the file's content be written 15851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * synchronously to the underlying storage device. </td></tr> 1591777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * </table> 16051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 16151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The <tt>"rws"</tt> and <tt>"rwd"</tt> modes work much like the {@link 16251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * java.nio.channels.FileChannel#force(boolean) force(boolean)} method of 16351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the {@link java.nio.channels.FileChannel} class, passing arguments of 16451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>true</tt> and <tt>false</tt>, respectively, except that they always 16551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * apply to every I/O operation and are therefore often more efficient. If 16651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file resides on a local storage device then when an invocation of a 16751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * method of this class returns it is guaranteed that all changes made to 16851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file by that invocation will have been written to that device. This 16951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is useful for ensuring that critical information is not lost in the 17051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * event of a system crash. If the file does not reside on a local device 17151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then no such guarantee is made. 17251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1731777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * <p>The <tt>"rwd"</tt> mode can be used to reduce the number of I/O 17451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * operations performed. Using <tt>"rwd"</tt> only requires updates to the 17551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file's content to be written to storage; using <tt>"rws"</tt> requires 17651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * updates to both the file's content and its metadata to be written, which 17751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * generally requires at least one more low-level I/O operation. 17851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1791777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * <p>If there is a security manager, its {@code checkRead} method is 1801777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * called with the pathname of the {@code file} argument as its 18151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * argument to see if read access to the file is allowed. If the mode 1821777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * allows writing, the security manager's {@code checkWrite} method is 18351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * also called with the path argument to see if write access to the file is 18451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * allowed. 18551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 18651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param file the file object 18751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param mode the access mode, as described 18851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <a href="#mode">above</a> 18951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IllegalArgumentException if the mode argument is not equal 19051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * to one of <tt>"r"</tt>, <tt>"rw"</tt>, <tt>"rws"</tt>, or 19151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>"rwd"</tt> 19251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception FileNotFoundException 19351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * if the mode is <tt>"r"</tt> but the given file object does 19451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * not denote an existing regular file, or if the mode begins 19551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * with <tt>"rw"</tt> but the given file object does not denote 19651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * an existing, writable regular file and a new regular file of 19751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * that name cannot be created, or if some other error occurs 19851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * while opening or creating the file 19951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception SecurityException if a security manager exists and its 2001777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code checkRead} method denies read access to the file 20151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or the mode is "rw" and the security manager's 2021777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code checkWrite} method denies write access to the file 20351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.SecurityManager#checkRead(java.lang.String) 20451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.SecurityManager#checkWrite(java.lang.String) 20551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.nio.channels.FileChannel#force(boolean) 20651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @revised 1.4 20751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @spec JSR-51 20851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 20951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public RandomAccessFile(File file, String mode) 21051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throws FileNotFoundException 21151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski { 21251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski String name = (file != null ? file.getPath() : null); 2138d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski this.mode = -1; 2148d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (mode.equals("r")) { 2158d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski this.mode = O_RDONLY; 2168d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } else if (mode.startsWith("rw")) { 2178d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // Android changed: Added. O_CREAT 2188d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski this.mode = O_RDWR | O_CREAT; 21951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski rw = true; 22051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (mode.length() > 2) { 2218d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (mode.equals("rws")) { 2228d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski syncMetadata = true; 2238d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } else if (mode.equals("rwd")) { 2248d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // Android-changeD: Should this be O_DSYNC and the above O_SYNC ? 2258d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski this.mode |= O_SYNC; 2268d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } else { 2278d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski this.mode = -1; 2288d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 22951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 23051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 2318d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 2328d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (this.mode < 0) { 23351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new IllegalArgumentException("Illegal mode \"" + mode 23451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski + "\" must be one of " 23551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski + "\"r\", \"rw\", \"rws\"," 23651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski + " or \"rwd\""); 23751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 2388d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 23951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (name == null) { 2408d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw new NullPointerException("file == null"); 24151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 2428d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 24351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (file.isInvalid()) { 24451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new FileNotFoundException("Invalid file path"); 24551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 24651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski this.path = name; 2478d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 2488d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // Android-changed: Use IoBridge.open() instead of open. 2498d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski fd = IoBridge.open(file.getPath(), this.mode); 2508d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (syncMetadata) { 2518d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 2528d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski fd.sync(); 2538d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } catch (IOException e) { 2548d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // Ignored 2558d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 2568d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 2578d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski guard.open("close"); 25851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 25951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 26051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 26151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the opaque file descriptor object associated with this 2621777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * stream. 26351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 26451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the file descriptor object associated with this stream. 26551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 26651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.io.FileDescriptor 26751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 26851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final FileDescriptor getFD() throws IOException { 2691777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak if (fd != null) { 2701777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak return fd; 2711777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak } 27251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new IOException(); 27351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 27451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 27551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 27651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the unique {@link java.nio.channels.FileChannel FileChannel} 27751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * object associated with this file. 27851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 27951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> The {@link java.nio.channels.FileChannel#position() 2801777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * position} of the returned channel will always be equal to 28151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * this object's file-pointer offset as returned by the {@link 28251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * #getFilePointer getFilePointer} method. Changing this object's 28351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file-pointer offset, whether explicitly or by reading or writing bytes, 28451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * will change the position of the channel, and vice versa. Changing the 28551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file's length via this object will change the length seen via the file 28651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * channel, and vice versa. 28751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 28851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the file channel associated with this file 28951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 29051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @since 1.4 29151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @spec JSR-51 29251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 29351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final FileChannel getChannel() { 29451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski synchronized (this) { 29551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (channel == null) { 2960f7f0c999e751ab883a247e1409dcc8730c87b9fPrzemyslaw Szczepaniak channel = FileChannelImpl.open(fd, path, true, rw, this); 29751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 29851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return channel; 29951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 30051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 30151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 30251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 30351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a byte of data from this file. The byte is returned as an 3041777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * integer in the range 0 to 255 ({@code 0x00-0x0ff}). This 30551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * method blocks if no input is yet available. 30651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 3071777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Although {@code RandomAccessFile} is not a subclass of 3081777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code InputStream}, this method behaves in exactly the same 30951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * way as the {@link InputStream#read()} method of 3101777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code InputStream}. 31151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 3121777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @return the next byte of data, or {@code -1} if the end of the 31351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file has been reached. 31451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. Not thrown if 31551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * end-of-file has been reached. 31651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 31751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int read() throws IOException { 3188d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski return (read(scratch, 0, 1) != -1) ? scratch[0] & 0xff : -1; 31951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 32051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 32151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 32251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a sub array as a sequence of bytes. 32351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the buffer into which the data is read. 32451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param off the start offset of the data. 32551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the number of bytes to read. 32651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException If an I/O error has occurred. 32751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 32851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private int readBytes(byte b[], int off, int len) throws IOException { 3298d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski return IoBridge.read(fd, b, off, len); 33051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 33151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 33251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 3331777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Reads up to {@code len} bytes of data from this file into an 33451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * array of bytes. This method blocks until at least one byte of input 33551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is available. 33651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 3371777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Although {@code RandomAccessFile} is not a subclass of 3381777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code InputStream}, this method behaves in exactly the 33951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * same way as the {@link InputStream#read(byte[], int, int)} method of 3401777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code InputStream}. 34151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 34251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the buffer into which the data is read. 3431777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param off the start offset in array {@code b} 34451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * at which the data is written. 34551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the maximum number of bytes read. 34651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the total number of bytes read into the buffer, or 3471777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code -1} if there is no more data because the end of 34851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file has been reached. 34951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException If the first byte cannot be read for any reason 35051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * other than end of file, or if the random access file has been closed, or if 35151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * some other I/O error occurs. 3521777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @exception NullPointerException If {@code b} is {@code null}. 3531777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @exception IndexOutOfBoundsException If {@code off} is negative, 3541777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code len} is negative, or {@code len} is greater than 3551777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code b.length - off} 35651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 35751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int read(byte b[], int off, int len) throws IOException { 35851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return readBytes(b, off, len); 35951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 36051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 36151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 3621777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Reads up to {@code b.length} bytes of data from this file 36351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * into an array of bytes. This method blocks until at least one byte 36451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of input is available. 36551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 3661777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Although {@code RandomAccessFile} is not a subclass of 3671777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code InputStream}, this method behaves in exactly the 36851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * same way as the {@link InputStream#read(byte[])} method of 3691777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code InputStream}. 37051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 37151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the buffer into which the data is read. 37251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the total number of bytes read into the buffer, or 3731777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code -1} if there is no more data because the end of 37451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * this file has been reached. 37551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException If the first byte cannot be read for any reason 37651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * other than end of file, or if the random access file has been closed, or if 37751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * some other I/O error occurs. 3781777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @exception NullPointerException If {@code b} is {@code null}. 37951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 38051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int read(byte b[]) throws IOException { 38151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return readBytes(b, 0, b.length); 38251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 38351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 38451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 3851777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Reads {@code b.length} bytes from this file into the byte 38651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * array, starting at the current file pointer. This method reads 38751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * repeatedly from the file until the requested number of bytes are 38851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * read. This method blocks until the requested number of bytes are 38951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * read, the end of the stream is detected, or an exception is thrown. 39051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 39151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the buffer into which the data is read. 39251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 39351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * all the bytes. 39451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 39551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 39651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void readFully(byte b[]) throws IOException { 39751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski readFully(b, 0, b.length); 39851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 39951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 40051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 4011777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Reads exactly {@code len} bytes from this file into the byte 40251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * array, starting at the current file pointer. This method reads 40351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * repeatedly from the file until the requested number of bytes are 40451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * read. This method blocks until the requested number of bytes are 40551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * read, the end of the stream is detected, or an exception is thrown. 40651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 40751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the buffer into which the data is read. 40851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param off the start offset of the data. 40951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the number of bytes to read. 41051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 41151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * all the bytes. 41251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 41351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 41451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void readFully(byte b[], int off, int len) throws IOException { 41551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int n = 0; 41651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski do { 41751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int count = this.read(b, off + n, len - n); 41851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (count < 0) 41951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 42051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski n += count; 42151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } while (n < len); 42251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 42351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 42451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 4251777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Attempts to skip over {@code n} bytes of input discarding the 42651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * skipped bytes. 42751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 42851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 42951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method may skip over some smaller number of bytes, possibly zero. 43051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This may result from any of a number of conditions; reaching end of 4311777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * file before {@code n} bytes have been skipped is only one 4321777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * possibility. This method never throws an {@code EOFException}. 4331777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * The actual number of bytes skipped is returned. If {@code n} 43451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is negative, no bytes are skipped. 43551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 43651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param n the number of bytes to be skipped. 43751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the actual number of bytes skipped. 43851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 43951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 44051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int skipBytes(int n) throws IOException { 44151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski long pos; 44251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski long len; 44351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski long newpos; 44451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 44551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (n <= 0) { 44651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return 0; 44751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 44851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski pos = getFilePointer(); 44951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski len = length(); 45051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski newpos = pos + n; 45151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (newpos > len) { 45251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski newpos = len; 45351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 45451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski seek(newpos); 45551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 45651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /* return the actual number of bytes skipped */ 45751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (int) (newpos - pos); 45851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 45951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 46051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // 'Write' primitives 46151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 46251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 46351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes the specified byte to this file. The write starts at 46451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the current file pointer. 46551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 4661777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param b the {@code byte} to be written. 46751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 46851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 46951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void write(int b) throws IOException { 4708d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski scratch[0] = (byte) (b & 0xff); 4718d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski write(scratch, 0, 1); 47251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 47351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 47451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 47551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a sub array as a sequence of bytes. 47651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the data to be written 47751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param off the start offset in the data 47851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the number of bytes that are written 47951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException If an I/O error has occurred. 48051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 48151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private void writeBytes(byte b[], int off, int len) throws IOException { 4828d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski IoBridge.write(fd, b, off, len); 4838d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // if we are in "rws" mode, attempt to sync file+metadata 4848d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (syncMetadata) { 4858d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski fd.sync(); 48651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 48751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 48851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 48951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 4901777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Writes {@code b.length} bytes from the specified byte array 49151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * to this file, starting at the current file pointer. 49251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 49351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the data. 49451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 49551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 49651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void write(byte b[]) throws IOException { 49751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeBytes(b, 0, b.length); 49851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 49951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 50051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 5011777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Writes {@code len} bytes from the specified byte array 5021777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * starting at offset {@code off} to this file. 50351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 50451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the data. 50551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param off the start offset in the data. 50651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the number of bytes to write. 50751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 50851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 50951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void write(byte b[], int off, int len) throws IOException { 51051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeBytes(b, off, len); 51151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 51251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 51351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // 'Random access' stuff 51451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 51551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 51651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the current offset in this file. 51751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 51851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the offset from the beginning of the file, in bytes, 51951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * at which the next read or write occurs. 52051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 52151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 5228d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski public long getFilePointer() throws IOException { 5238d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 5248d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski return Libcore.os.lseek(fd, 0L, SEEK_CUR); 5258d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } catch (ErrnoException errnoException) { 5268d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw errnoException.rethrowAsIOException(); 5278d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5288d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 52951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 53051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 53151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Sets the file-pointer offset, measured from the beginning of this 53251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file, at which the next read or write occurs. The offset may be 53351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * set beyond the end of the file. Setting the offset beyond the end 53451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of the file does not change the file length. The file length will 53551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * change only by writing after the offset has been set beyond the end 53651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of the file. 53751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 5389e78cee3f3edf84254174717f475605d712aad1cNarayan Kamath * @param offset the offset position, measured in bytes from the 53951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * beginning of the file, at which to set the file 54051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * pointer. 5411777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @exception IOException if {@code pos} is less than 5421777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code 0} or if an I/O error occurs. 54351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 5448d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski public void seek(long offset) throws IOException { 5458d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (offset < 0) { 5468d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw new IOException("offset < 0: " + offset); 5478d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5488d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 5498d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski Libcore.os.lseek(fd, offset, SEEK_SET); 5508d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } catch (ErrnoException errnoException) { 5518d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw errnoException.rethrowAsIOException(); 5528d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5538d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 55451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 55551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 55651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the length of this file. 55751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 55851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the length of this file, measured in bytes. 55951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 56051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 5618d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski public long length() throws IOException { 5628d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 5638d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski return Libcore.os.fstat(fd).st_size; 5648d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } catch (ErrnoException errnoException) { 5658d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw errnoException.rethrowAsIOException(); 5668d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5678d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 56851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 56951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 57051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Sets the length of this file. 57151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 57251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> If the present length of the file as returned by the 5731777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code length} method is greater than the {@code newLength} 57451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * argument then the file will be truncated. In this case, if the file 5751777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * offset as returned by the {@code getFilePointer} method is greater 5761777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * than {@code newLength} then after this method returns the offset 5771777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * will be equal to {@code newLength}. 57851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 57951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> If the present length of the file as returned by the 5801777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code length} method is smaller than the {@code newLength} 58151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * argument then the file will be extended. In this case, the contents of 58251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the extended portion of the file are not defined. 58351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 58451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param newLength The desired length of the file 58551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException If an I/O error occurs 58651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @since 1.2 58751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 5888d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski public void setLength(long newLength) throws IOException { 5898d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (newLength < 0) { 5908d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw new IllegalArgumentException("newLength < 0"); 5918d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5928d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 5938d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski Libcore.os.ftruncate(fd, newLength); 5948d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } catch (ErrnoException errnoException) { 5958d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw errnoException.rethrowAsIOException(); 5968d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5978d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 5988d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski long filePointer = getFilePointer(); 5998d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (filePointer > newLength) { 6008d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski seek(newLength); 6018d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 6028d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // if we are in "rws" mode, attempt to sync file+metadata 6038d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (syncMetadata) { 6048d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski fd.sync(); 6058d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 6068d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 6078d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 60851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 60951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 61051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Closes this random access file stream and releases any system 61151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * resources associated with the stream. A closed random access 61251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file cannot perform input or output operations and cannot be 61351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * reopened. 61451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 61551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> If this file has an associated channel then the channel is closed 61651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * as well. 61751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 61851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 61951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 62051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @revised 1.4 62151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @spec JSR-51 62251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 62351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void close() throws IOException { 6248d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski guard.close(); 62551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski synchronized (closeLock) { 62651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (closed) { 62751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return; 62851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 62951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski closed = true; 63051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 6318d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 6328d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (channel != null && channel.isOpen()) { 63351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski channel.close(); 63451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 6358d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski IoBridge.closeAndSignalBlockedThreads(fd); 63651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 63751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 63851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // 63951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // Some "reading/writing Java data types" methods stolen from 64051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // DataInputStream and DataOutputStream. 64151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // 64251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 64351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 6441777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Reads a {@code boolean} from this file. This method reads a 64551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * single byte from the file, starting at the current file pointer. 6461777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * A value of {@code 0} represents 6471777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code false}. Any other value represents {@code true}. 64851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the byte is read, the end of the stream 64951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is detected, or an exception is thrown. 65051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 6511777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @return the {@code boolean} value read. 65251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file has reached the end. 65351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 65451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 65551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final boolean readBoolean() throws IOException { 65651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch = this.read(); 65751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (ch < 0) 65851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 65951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (ch != 0); 66051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 66151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 66251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 66351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a signed eight-bit value from this file. This method reads a 66451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * byte from the file, starting from the current file pointer. 6651777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * If the byte read is {@code b}, where 66651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>0 <= b <= 255</code>, 66751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then the result is: 66851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 66951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (byte)(b) 67051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 67151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 67251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the byte is read, the end of the stream 67351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is detected, or an exception is thrown. 67451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 67551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next byte of this file as a signed eight-bit 6761777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code byte}. 67751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file has reached the end. 67851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 67951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 68051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final byte readByte() throws IOException { 68151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch = this.read(); 68251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (ch < 0) 68351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 68451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (byte)(ch); 68551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 68651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 68751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 68851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads an unsigned eight-bit number from this file. This method reads 68951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * a byte from this file, starting at the current file pointer, 69051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * and returns that byte. 69151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 69251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the byte is read, the end of the stream 69351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is detected, or an exception is thrown. 69451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 69551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next byte of this file, interpreted as an unsigned 69651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * eight-bit number. 69751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file has reached the end. 69851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 69951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 70051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final int readUnsignedByte() throws IOException { 70151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch = this.read(); 70251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (ch < 0) 70351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 70451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return ch; 70551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 70651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 70751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 70851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a signed 16-bit number from this file. The method reads two 70951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * bytes from this file, starting at the current file pointer. 71051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the two bytes read, in order, are 7111777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code b1} and {@code b2}, where each of the two values is 7121777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * between {@code 0} and {@code 255}, inclusive, then the 71351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * result is equal to: 71451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 71551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (short)((b1 << 8) | b2) 71651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 71751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 71851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the two bytes are read, the end of the 71951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 72051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 72151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next two bytes of this file, interpreted as a signed 72251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 16-bit number. 72351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 72451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * two bytes. 72551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 72651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 72751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final short readShort() throws IOException { 72851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch1 = this.read(); 72951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch2 = this.read(); 73051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((ch1 | ch2) < 0) 73151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 73251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (short)((ch1 << 8) + (ch2 << 0)); 73351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 73451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 73551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 73651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads an unsigned 16-bit number from this file. This method reads 73751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * two bytes from the file, starting at the current file pointer. 73851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the bytes read, in order, are 7391777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code b1} and {@code b2}, where 74051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>0 <= b1, b2 <= 255</code>, 74151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then the result is equal to: 74251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 74351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (b1 << 8) | b2 74451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 74551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 74651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the two bytes are read, the end of the 74751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 74851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 74951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next two bytes of this file, interpreted as an unsigned 75051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 16-bit integer. 75151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 75251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * two bytes. 75351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 75451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 75551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final int readUnsignedShort() throws IOException { 75651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch1 = this.read(); 75751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch2 = this.read(); 75851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((ch1 | ch2) < 0) 75951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 76051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (ch1 << 8) + (ch2 << 0); 76151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 76251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 76351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 76451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a character from this file. This method reads two 76551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * bytes from the file, starting at the current file pointer. 76651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the bytes read, in order, are 7671777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code b1} and {@code b2}, where 76851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>0 <= b1, b2 <= 255</code>, 76951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then the result is equal to: 77051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 77151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (char)((b1 << 8) | b2) 77251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 77351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 77451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the two bytes are read, the end of the 77551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 77651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 77751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next two bytes of this file, interpreted as a 7781777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code char}. 77951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 78051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * two bytes. 78151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 78251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 78351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final char readChar() throws IOException { 78451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch1 = this.read(); 78551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch2 = this.read(); 78651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((ch1 | ch2) < 0) 78751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 78851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (char)((ch1 << 8) + (ch2 << 0)); 78951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 79051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 79151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 79251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a signed 32-bit integer from this file. This method reads 4 79351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * bytes from the file, starting at the current file pointer. 7941777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * If the bytes read, in order, are {@code b1}, 7951777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code b2}, {@code b3}, and {@code b4}, where 79651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>0 <= b1, b2, b3, b4 <= 255</code>, 79751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then the result is equal to: 79851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 79951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (b1 << 24) | (b2 << 16) + (b3 << 8) + b4 80051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 80151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 80251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the four bytes are read, the end of the 80351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 80451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 80551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next four bytes of this file, interpreted as an 8061777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code int}. 80751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 80851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * four bytes. 80951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 81051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 81151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final int readInt() throws IOException { 81251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch1 = this.read(); 81351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch2 = this.read(); 81451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch3 = this.read(); 81551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch4 = this.read(); 81651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((ch1 | ch2 | ch3 | ch4) < 0) 81751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 81851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + (ch4 << 0)); 81951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 82051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 82151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 82251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a signed 64-bit integer from this file. This method reads eight 82351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * bytes from the file, starting at the current file pointer. 82451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the bytes read, in order, are 8251777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code b1}, {@code b2}, {@code b3}, 8261777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code b4}, {@code b5}, {@code b6}, 8271777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code b7}, and {@code b8,} where: 82851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 82951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 0 <= b1, b2, b3, b4, b5, b6, b7, b8 <=255, 83051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 83151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 83251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then the result is equal to: 8331777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * <blockquote><pre> 83451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * ((long)b1 << 56) + ((long)b2 << 48) 83551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * + ((long)b3 << 40) + ((long)b4 << 32) 83651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * + ((long)b5 << 24) + ((long)b6 << 16) 83751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * + ((long)b7 << 8) + b8 83851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 83951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 84051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the eight bytes are read, the end of the 84151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 84251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 84351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next eight bytes of this file, interpreted as a 8441777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code long}. 84551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 84651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * eight bytes. 84751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 84851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 84951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final long readLong() throws IOException { 85051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return ((long)(readInt()) << 32) + (readInt() & 0xFFFFFFFFL); 85151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 85251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 85351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 8541777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Reads a {@code float} from this file. This method reads an 8551777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code int} value, starting at the current file pointer, 8561777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * as if by the {@code readInt} method 8571777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * and then converts that {@code int} to a {@code float} 8581777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * using the {@code intBitsToFloat} method in class 8591777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code Float}. 86051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 86151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the four bytes are read, the end of the 86251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 86351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 86451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next four bytes of this file, interpreted as a 8651777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code float}. 86651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 86751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * four bytes. 86851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 86951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.io.RandomAccessFile#readInt() 87051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.Float#intBitsToFloat(int) 87151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 87251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final float readFloat() throws IOException { 87351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return Float.intBitsToFloat(readInt()); 87451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 87551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 87651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 8771777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Reads a {@code double} from this file. This method reads a 8781777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code long} value, starting at the current file pointer, 8791777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * as if by the {@code readLong} method 8801777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * and then converts that {@code long} to a {@code double} 8811777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * using the {@code longBitsToDouble} method in 8821777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * class {@code Double}. 88351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 88451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the eight bytes are read, the end of the 88551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 88651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 88751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next eight bytes of this file, interpreted as a 8881777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code double}. 88951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 89051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * eight bytes. 89151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 89251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.io.RandomAccessFile#readLong() 89351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.Double#longBitsToDouble(long) 89451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 89551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final double readDouble() throws IOException { 89651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return Double.longBitsToDouble(readLong()); 89751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 89851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 89951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 90051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads the next line of text from this file. This method successively 90151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * reads bytes from the file, starting at the current file pointer, 90251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * until it reaches a line terminator or the end 90351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of the file. Each byte is converted into a character by taking the 90451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * byte's value for the lower eight bits of the character and setting the 90551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * high eight bits of the character to zero. This method does not, 90651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * therefore, support the full Unicode character set. 90751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 90851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> A line of text is terminated by a carriage-return character 9091777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * ({@code '\u005Cr'}), a newline character ({@code '\u005Cn'}), a 91051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * carriage-return character immediately followed by a newline character, 91151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or the end of the file. Line-terminating characters are discarded and 91251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * are not included as part of the string returned. 91351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 91451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> This method blocks until a newline character is read, a carriage 91551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * return and the byte following it are read (to see if it is a newline), 91651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the end of the file is reached, or an exception is thrown. 91751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 91851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next line of text from this file, or null if end 91951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of file is encountered before even one byte is read. 92051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 92151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 92251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 92351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final String readLine() throws IOException { 92451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski StringBuffer input = new StringBuffer(); 92551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int c = -1; 92651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski boolean eol = false; 92751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 92851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski while (!eol) { 92951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski switch (c = read()) { 93051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski case -1: 93151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski case '\n': 93251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski eol = true; 93351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski break; 93451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski case '\r': 93551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski eol = true; 93651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski long cur = getFilePointer(); 93751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((read()) != '\n') { 93851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski seek(cur); 93951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 94051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski break; 94151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski default: 94251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski input.append((char)c); 94351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski break; 94451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 94551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 94651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 94751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((c == -1) && (input.length() == 0)) { 94851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return null; 94951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 95051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return input.toString(); 95151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 95251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 95351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 95451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads in a string from this file. The string has been encoded 95551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * using a 95651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <a href="DataInput.html#modified-utf-8">modified UTF-8</a> 95751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * format. 95851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 95951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The first two bytes are read, starting from the current file 96051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * pointer, as if by 9611777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code readUnsignedShort}. This value gives the number of 96251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * following bytes that are in the encoded string, not 96351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the length of the resulting string. The following bytes are then 96451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * interpreted as bytes encoding characters in the modified UTF-8 format 96551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * and are converted into characters. 96651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 96751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until all the bytes are read, the end of the 96851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 96951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 97051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return a Unicode string. 97151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before 97251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * reading all the bytes. 97351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 97451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception UTFDataFormatException if the bytes do not represent 97551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * valid modified UTF-8 encoding of a Unicode string. 97651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.io.RandomAccessFile#readUnsignedShort() 97751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 97851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final String readUTF() throws IOException { 97951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return DataInputStream.readUTF(this); 98051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 98151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 98251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 9831777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Writes a {@code boolean} to the file as a one-byte value. The 9841777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * value {@code true} is written out as the value 9851777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code (byte)1}; the value {@code false} is written out 9861777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * as the value {@code (byte)0}. The write starts at 98751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the current position of the file pointer. 98851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 9891777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param v a {@code boolean} value to be written. 99051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 99151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 99251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeBoolean(boolean v) throws IOException { 99351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write(v ? 1 : 0); 99451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written++; 99551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 99651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 99751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 9981777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Writes a {@code byte} to the file as a one-byte value. The 99951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * write starts at the current position of the file pointer. 100051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 10011777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param v a {@code byte} value to be written. 100251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 100351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 100451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeByte(int v) throws IOException { 100551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write(v); 100651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written++; 100751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 100851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 100951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 10101777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Writes a {@code short} to the file as two bytes, high byte first. 101151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The write starts at the current position of the file pointer. 101251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 10131777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param v a {@code short} to be written. 101451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 101551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 101651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeShort(int v) throws IOException { 101751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 8) & 0xFF); 101851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 0) & 0xFF); 101951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written += 2; 102051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 102151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 102251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 10231777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Writes a {@code char} to the file as a two-byte value, high 102451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * byte first. The write starts at the current position of the 102551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file pointer. 102651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 10271777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param v a {@code char} value to be written. 102851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 102951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 103051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeChar(int v) throws IOException { 103151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 8) & 0xFF); 103251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 0) & 0xFF); 103351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written += 2; 103451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 103551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 103651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 10371777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Writes an {@code int} to the file as four bytes, high byte first. 103851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The write starts at the current position of the file pointer. 103951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 10401777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param v an {@code int} to be written. 104151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 104251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 104351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeInt(int v) throws IOException { 104451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 24) & 0xFF); 104551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 16) & 0xFF); 104651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 8) & 0xFF); 104751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 0) & 0xFF); 104851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written += 4; 104951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 105051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 105151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 10521777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Writes a {@code long} to the file as eight bytes, high byte first. 105351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The write starts at the current position of the file pointer. 105451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 10551777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param v a {@code long} to be written. 105651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 105751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 105851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeLong(long v) throws IOException { 105951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 56) & 0xFF); 106051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 48) & 0xFF); 106151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 40) & 0xFF); 106251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 32) & 0xFF); 106351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 24) & 0xFF); 106451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 16) & 0xFF); 106551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 8) & 0xFF); 106651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 0) & 0xFF); 106751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written += 8; 106851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 106951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 107051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 10711777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Converts the float argument to an {@code int} using the 10721777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code floatToIntBits} method in class {@code Float}, 10731777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * and then writes that {@code int} value to the file as a 107451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * four-byte quantity, high byte first. The write starts at the 107551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * current position of the file pointer. 107651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 10771777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param v a {@code float} value to be written. 107851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 107951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.Float#floatToIntBits(float) 108051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 108151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeFloat(float v) throws IOException { 108251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeInt(Float.floatToIntBits(v)); 108351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 108451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 108551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 10861777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * Converts the double argument to a {@code long} using the 10871777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code doubleToLongBits} method in class {@code Double}, 10881777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * and then writes that {@code long} value to the file as an 108951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * eight-byte quantity, high byte first. The write starts at the current 109051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * position of the file pointer. 109151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 10921777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param v a {@code double} value to be written. 109351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 109451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.Double#doubleToLongBits(double) 109551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 109651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeDouble(double v) throws IOException { 109751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeLong(Double.doubleToLongBits(v)); 109851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 109951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 110051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 110151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes the string to the file as a sequence of bytes. Each 110251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * character in the string is written out, in sequence, by discarding 110351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * its high eight bits. The write starts at the current position of 110451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file pointer. 110551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 110651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param s a string of bytes to be written. 110751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 110851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 11091777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak @SuppressWarnings("deprecation") 111051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeBytes(String s) throws IOException { 111151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int len = s.length(); 111251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski byte[] b = new byte[len]; 111351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski s.getBytes(0, len, b, 0); 111451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeBytes(b, 0, len); 111551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 111651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 111751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 111851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a string to the file as a sequence of characters. Each 111951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * character is written to the data output stream as if by the 11201777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code writeChar} method. The write starts at the current 112151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * position of the file pointer. 112251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 11231777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * @param s a {@code String} value to be written. 112451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 112551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.io.RandomAccessFile#writeChar(int) 112651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 112751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeChars(String s) throws IOException { 112851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int clen = s.length(); 112951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int blen = 2*clen; 113051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski byte[] b = new byte[blen]; 113151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski char[] c = new char[clen]; 113251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski s.getChars(0, clen, c, 0); 113351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski for (int i = 0, j = 0; i < clen; i++) { 113451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski b[j++] = (byte)(c[i] >>> 8); 113551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski b[j++] = (byte)(c[i] >>> 0); 113651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 113751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeBytes(b, 0, blen); 113851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 113951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 114051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 114151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a string to the file using 114251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <a href="DataInput.html#modified-utf-8">modified UTF-8</a> 114351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * encoding in a machine-independent manner. 114451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 114551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * First, two bytes are written to the file, starting at the 114651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * current file pointer, as if by the 11471777d314864b48924136822b29aabffeb8a367c1Przemyslaw Szczepaniak * {@code writeShort} method giving the number of bytes to 114851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * follow. This value is the number of bytes actually written out, 114951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * not the length of the string. Following the length, each character 115051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of the string is output, in sequence, using the modified UTF-8 encoding 115151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * for each character. 115251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 115351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param str a string to be written. 115451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 115551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 115651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeUTF(String str) throws IOException { 115751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski DataOutputStream.writeUTF(str, this); 115851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 115951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 11608d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski @Override protected void finalize() throws Throwable { 11618d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 11628d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (guard != null) { 11638d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski guard.warnIfOpen(); 11648d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 11658d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski close(); 11668d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } finally { 11678d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski super.finalize(); 11688d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 116951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 117051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski} 1171