RandomAccessFile.java revision 8d05e88f57c1ea5543d4012687c70cd64efcada0
151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski/* 251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Copyright (c) 1994, 2013, Oracle and/or its affiliates. All rights reserved. 351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This code is free software; you can redistribute it and/or modify it 651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * under the terms of the GNU General Public License version 2 only, as 751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * published by the Free Software Foundation. Oracle designates this 851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * particular file as subject to the "Classpath" exception as provided 951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * by Oracle in the LICENSE file that accompanied this code. 1051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This code is distributed in the hope that it will be useful, but WITHOUT 1251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * version 2 for more details (a copy is included in the LICENSE file that 1551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * accompanied this code). 1651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * You should have received a copy of the GNU General Public License version 1851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 2 along with this work; if not, write to the Free Software Foundation, 1951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 2051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 2151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or visit www.oracle.com if you need additional information or have any 2351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * questions. 2451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 2551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 2651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskipackage java.io; 2751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 2851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskiimport java.nio.channels.FileChannel; 2951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskiimport sun.nio.ch.FileChannelImpl; 3051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskiimport sun.misc.IoTrace; 318d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebskiimport android.system.ErrnoException; 328d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebskiimport dalvik.system.CloseGuard; 338d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebskiimport java.nio.NioUtils; 348d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebskiimport libcore.io.IoBridge; 358d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebskiimport libcore.io.Libcore; 368d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebskiimport static android.system.OsConstants.*; 3751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 3851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 3951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski/** 4051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Instances of this class support both reading and writing to a 4151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * random access file. A random access file behaves like a large 4251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * array of bytes stored in the file system. There is a kind of cursor, 4351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or index into the implied array, called the <em>file pointer</em>; 4451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * input operations read bytes starting at the file pointer and advance 4551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file pointer past the bytes read. If the random access file is 4651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * created in read/write mode, then output operations are also available; 4751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * output operations write bytes starting at the file pointer and advance 4851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file pointer past the bytes written. Output operations that write 4951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * past the current end of the implied array cause the array to be 5051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * extended. The file pointer can be read by the 5151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>getFilePointer</code> method and set by the <code>seek</code> 5251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * method. 5351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 5451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * It is generally true of all the reading routines in this class that 5551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * if end-of-file is reached before the desired number of bytes has been 5651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * read, an <code>EOFException</code> (which is a kind of 5751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>IOException</code>) is thrown. If any byte cannot be read for 5851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * any reason other than end-of-file, an <code>IOException</code> other 5951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * than <code>EOFException</code> is thrown. In particular, an 6051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>IOException</code> may be thrown if the stream has been closed. 6151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 6251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @author unascribed 6351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @since JDK1.0 6451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 6551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 6651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskipublic class RandomAccessFile implements DataOutput, DataInput, Closeable { 6751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 688d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski private final CloseGuard guard = CloseGuard.get(); 698d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski private final byte[] scratch = new byte[8]; 708d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski private boolean syncMetadata = false; 718d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski private int mode; 728d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 7351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private FileDescriptor fd; 7451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private FileChannel channel = null; 7551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private boolean rw; 7651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 7751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /* The path of the referenced file */ 7851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private final String path; 7951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 8051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private Object closeLock = new Object(); 8151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private volatile boolean closed = false; 8251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 8351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 8451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Creates a random access file stream to read from, and optionally 8551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * to write to, a file with the specified name. A new 8651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * {@link FileDescriptor} object is created to represent the 8751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * connection to the file. 8851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 8951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> The <tt>mode</tt> argument specifies the access mode with which the 9051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file is to be opened. The permitted values and their meanings are as 9151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * specified for the <a 9251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * href="#mode"><tt>RandomAccessFile(File,String)</tt></a> constructor. 9351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 9451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 9551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If there is a security manager, its <code>checkRead</code> method 9651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is called with the <code>name</code> argument 9751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * as its argument to see if read access to the file is allowed. 9851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the mode allows writing, the security manager's 9951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>checkWrite</code> method 10051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is also called with the <code>name</code> argument 10151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * as its argument to see if write access to the file is allowed. 10251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 10351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param name the system-dependent filename 10451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param mode the access <a href="#mode">mode</a> 10551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IllegalArgumentException if the mode argument is not equal 10651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * to one of <tt>"r"</tt>, <tt>"rw"</tt>, <tt>"rws"</tt>, or 10751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>"rwd"</tt> 10851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception FileNotFoundException 10951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * if the mode is <tt>"r"</tt> but the given string does not 11051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * denote an existing regular file, or if the mode begins with 11151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>"rw"</tt> but the given string does not denote an 11251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * existing, writable regular file and a new regular file of 11351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * that name cannot be created, or if some other error occurs 11451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * while opening or creating the file 11551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception SecurityException if a security manager exists and its 11651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>checkRead</code> method denies read access to the file 11751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or the mode is "rw" and the security manager's 11851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>checkWrite</code> method denies write access to the file 11951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.SecurityException 12051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.SecurityManager#checkRead(java.lang.String) 12151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.SecurityManager#checkWrite(java.lang.String) 12251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @revised 1.4 12351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @spec JSR-51 12451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 12551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public RandomAccessFile(String name, String mode) 12651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throws FileNotFoundException 12751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski { 12851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski this(name != null ? new File(name) : null, mode); 12951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 13051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 13151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 13251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Creates a random access file stream to read from, and optionally to 13351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * write to, the file specified by the {@link File} argument. A new {@link 13451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * FileDescriptor} object is created to represent this file connection. 13551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 13651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <a name="mode"><p> The <tt>mode</tt> argument specifies the access mode 13751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * in which the file is to be opened. The permitted values and their 13851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * meanings are: 13951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 14051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><table summary="Access mode permitted values and meanings"> 14151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tr><th><p align="left">Value</p></th><th><p align="left">Meaning</p></th></tr> 14251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tr><td valign="top"><tt>"r"</tt></td> 14351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <td> Open for reading only. Invoking any of the <tt>write</tt> 14451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * methods of the resulting object will cause an {@link 14551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * java.io.IOException} to be thrown. </td></tr> 14651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tr><td valign="top"><tt>"rw"</tt></td> 14751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <td> Open for reading and writing. If the file does not already 14851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * exist then an attempt will be made to create it. </td></tr> 14951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tr><td valign="top"><tt>"rws"</tt></td> 15051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <td> Open for reading and writing, as with <tt>"rw"</tt>, and also 15151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * require that every update to the file's content or metadata be 15251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * written synchronously to the underlying storage device. </td></tr> 15351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tr><td valign="top"><tt>"rwd" </tt></td> 15451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <td> Open for reading and writing, as with <tt>"rw"</tt>, and also 15551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * require that every update to the file's content be written 15651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * synchronously to the underlying storage device. </td></tr> 15751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </table></blockquote> 15851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 15951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The <tt>"rws"</tt> and <tt>"rwd"</tt> modes work much like the {@link 16051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * java.nio.channels.FileChannel#force(boolean) force(boolean)} method of 16151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the {@link java.nio.channels.FileChannel} class, passing arguments of 16251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>true</tt> and <tt>false</tt>, respectively, except that they always 16351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * apply to every I/O operation and are therefore often more efficient. If 16451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file resides on a local storage device then when an invocation of a 16551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * method of this class returns it is guaranteed that all changes made to 16651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file by that invocation will have been written to that device. This 16751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is useful for ensuring that critical information is not lost in the 16851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * event of a system crash. If the file does not reside on a local device 16951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then no such guarantee is made. 17051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 17151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> The <tt>"rwd"</tt> mode can be used to reduce the number of I/O 17251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * operations performed. Using <tt>"rwd"</tt> only requires updates to the 17351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file's content to be written to storage; using <tt>"rws"</tt> requires 17451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * updates to both the file's content and its metadata to be written, which 17551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * generally requires at least one more low-level I/O operation. 17651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 17751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> If there is a security manager, its <code>checkRead</code> method is 17851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * called with the pathname of the <code>file</code> argument as its 17951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * argument to see if read access to the file is allowed. If the mode 18051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * allows writing, the security manager's <code>checkWrite</code> method is 18151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * also called with the path argument to see if write access to the file is 18251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * allowed. 18351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 18451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param file the file object 18551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param mode the access mode, as described 18651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <a href="#mode">above</a> 18751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IllegalArgumentException if the mode argument is not equal 18851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * to one of <tt>"r"</tt>, <tt>"rw"</tt>, <tt>"rws"</tt>, or 18951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>"rwd"</tt> 19051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception FileNotFoundException 19151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * if the mode is <tt>"r"</tt> but the given file object does 19251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * not denote an existing regular file, or if the mode begins 19351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * with <tt>"rw"</tt> but the given file object does not denote 19451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * an existing, writable regular file and a new regular file of 19551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * that name cannot be created, or if some other error occurs 19651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * while opening or creating the file 19751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception SecurityException if a security manager exists and its 19851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>checkRead</code> method denies read access to the file 19951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or the mode is "rw" and the security manager's 20051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>checkWrite</code> method denies write access to the file 20151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.SecurityManager#checkRead(java.lang.String) 20251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.SecurityManager#checkWrite(java.lang.String) 20351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.nio.channels.FileChannel#force(boolean) 20451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @revised 1.4 20551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @spec JSR-51 20651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 20751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public RandomAccessFile(File file, String mode) 20851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throws FileNotFoundException 20951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski { 21051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski String name = (file != null ? file.getPath() : null); 2118d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski this.mode = -1; 2128d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (mode.equals("r")) { 2138d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski this.mode = O_RDONLY; 2148d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } else if (mode.startsWith("rw")) { 2158d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // Android changed: Added. O_CREAT 2168d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski this.mode = O_RDWR | O_CREAT; 21751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski rw = true; 21851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (mode.length() > 2) { 2198d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (mode.equals("rws")) { 2208d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski syncMetadata = true; 2218d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } else if (mode.equals("rwd")) { 2228d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // Android-changeD: Should this be O_DSYNC and the above O_SYNC ? 2238d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski this.mode |= O_SYNC; 2248d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } else { 2258d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski this.mode = -1; 2268d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 22751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 22851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 2298d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 2308d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (this.mode < 0) { 23151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new IllegalArgumentException("Illegal mode \"" + mode 23251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski + "\" must be one of " 23351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski + "\"r\", \"rw\", \"rws\"," 23451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski + " or \"rwd\""); 23551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 2368d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 23751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (name == null) { 2388d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw new NullPointerException("file == null"); 23951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 2408d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 24151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (file.isInvalid()) { 24251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new FileNotFoundException("Invalid file path"); 24351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 24451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski this.path = name; 2458d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 2468d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // Android-changed: Use IoBridge.open() instead of open. 2478d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski fd = IoBridge.open(file.getPath(), this.mode); 2488d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (syncMetadata) { 2498d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 2508d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski fd.sync(); 2518d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } catch (IOException e) { 2528d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // Ignored 2538d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 2548d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 2558d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski guard.open("close"); 25651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 25751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 25851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 25951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the opaque file descriptor object associated with this 26051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream. </p> 26151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 26251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the file descriptor object associated with this stream. 26351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 26451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.io.FileDescriptor 26551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 26651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final FileDescriptor getFD() throws IOException { 26751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (fd != null) return fd; 26851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new IOException(); 26951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 27051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 27151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 27251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the unique {@link java.nio.channels.FileChannel FileChannel} 27351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * object associated with this file. 27451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 27551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> The {@link java.nio.channels.FileChannel#position() 27651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </code>position<code>} of the returned channel will always be equal to 27751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * this object's file-pointer offset as returned by the {@link 27851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * #getFilePointer getFilePointer} method. Changing this object's 27951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file-pointer offset, whether explicitly or by reading or writing bytes, 28051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * will change the position of the channel, and vice versa. Changing the 28151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file's length via this object will change the length seen via the file 28251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * channel, and vice versa. 28351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 28451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the file channel associated with this file 28551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 28651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @since 1.4 28751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @spec JSR-51 28851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 28951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final FileChannel getChannel() { 29051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski synchronized (this) { 29151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (channel == null) { 2928d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski channel = NioUtils.newFileChannel(this, fd, mode); 29351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 29451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return channel; 29551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 29651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 29751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 29851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 29951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a byte of data from this file. The byte is returned as an 30051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * integer in the range 0 to 255 (<code>0x00-0x0ff</code>). This 30151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * method blocks if no input is yet available. 30251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 30351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Although <code>RandomAccessFile</code> is not a subclass of 30451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>InputStream</code>, this method behaves in exactly the same 30551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * way as the {@link InputStream#read()} method of 30651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>InputStream</code>. 30751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 30851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next byte of data, or <code>-1</code> if the end of the 30951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file has been reached. 31051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. Not thrown if 31151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * end-of-file has been reached. 31251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 31351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int read() throws IOException { 3148d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski return (read(scratch, 0, 1) != -1) ? scratch[0] & 0xff : -1; 31551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 31651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 31751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 31851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a sub array as a sequence of bytes. 31951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the buffer into which the data is read. 32051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param off the start offset of the data. 32151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the number of bytes to read. 32251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException If an I/O error has occurred. 32351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 32451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private int readBytes(byte b[], int off, int len) throws IOException { 3258d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski return IoBridge.read(fd, b, off, len); 32651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 32751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 32851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 32951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads up to <code>len</code> bytes of data from this file into an 33051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * array of bytes. This method blocks until at least one byte of input 33151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is available. 33251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 33351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Although <code>RandomAccessFile</code> is not a subclass of 33451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>InputStream</code>, this method behaves in exactly the 33551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * same way as the {@link InputStream#read(byte[], int, int)} method of 33651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>InputStream</code>. 33751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 33851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the buffer into which the data is read. 33951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param off the start offset in array <code>b</code> 34051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * at which the data is written. 34151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the maximum number of bytes read. 34251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the total number of bytes read into the buffer, or 34351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>-1</code> if there is no more data because the end of 34451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file has been reached. 34551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException If the first byte cannot be read for any reason 34651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * other than end of file, or if the random access file has been closed, or if 34751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * some other I/O error occurs. 34851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception NullPointerException If <code>b</code> is <code>null</code>. 34951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IndexOutOfBoundsException If <code>off</code> is negative, 35051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>len</code> is negative, or <code>len</code> is greater than 35151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>b.length - off</code> 35251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 35351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int read(byte b[], int off, int len) throws IOException { 35451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return readBytes(b, off, len); 35551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 35651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 35751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 35851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads up to <code>b.length</code> bytes of data from this file 35951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * into an array of bytes. This method blocks until at least one byte 36051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of input is available. 36151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 36251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Although <code>RandomAccessFile</code> is not a subclass of 36351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>InputStream</code>, this method behaves in exactly the 36451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * same way as the {@link InputStream#read(byte[])} method of 36551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>InputStream</code>. 36651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 36751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the buffer into which the data is read. 36851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the total number of bytes read into the buffer, or 36951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>-1</code> if there is no more data because the end of 37051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * this file has been reached. 37151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException If the first byte cannot be read for any reason 37251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * other than end of file, or if the random access file has been closed, or if 37351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * some other I/O error occurs. 37451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception NullPointerException If <code>b</code> is <code>null</code>. 37551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 37651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int read(byte b[]) throws IOException { 37751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return readBytes(b, 0, b.length); 37851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 37951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 38051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 38151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads <code>b.length</code> bytes from this file into the byte 38251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * array, starting at the current file pointer. This method reads 38351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * repeatedly from the file until the requested number of bytes are 38451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * read. This method blocks until the requested number of bytes are 38551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * read, the end of the stream is detected, or an exception is thrown. 38651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 38751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the buffer into which the data is read. 38851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 38951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * all the bytes. 39051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 39151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 39251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void readFully(byte b[]) throws IOException { 39351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski readFully(b, 0, b.length); 39451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 39551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 39651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 39751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads exactly <code>len</code> bytes from this file into the byte 39851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * array, starting at the current file pointer. This method reads 39951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * repeatedly from the file until the requested number of bytes are 40051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * read. This method blocks until the requested number of bytes are 40151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * read, the end of the stream is detected, or an exception is thrown. 40251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 40351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the buffer into which the data is read. 40451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param off the start offset of the data. 40551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the number of bytes to read. 40651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 40751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * all the bytes. 40851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 40951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 41051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void readFully(byte b[], int off, int len) throws IOException { 41151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int n = 0; 41251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski do { 41351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int count = this.read(b, off + n, len - n); 41451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (count < 0) 41551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 41651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski n += count; 41751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } while (n < len); 41851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 41951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 42051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 42151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Attempts to skip over <code>n</code> bytes of input discarding the 42251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * skipped bytes. 42351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 42451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 42551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method may skip over some smaller number of bytes, possibly zero. 42651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This may result from any of a number of conditions; reaching end of 42751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file before <code>n</code> bytes have been skipped is only one 42851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * possibility. This method never throws an <code>EOFException</code>. 42951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The actual number of bytes skipped is returned. If <code>n</code> 43051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is negative, no bytes are skipped. 43151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 43251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param n the number of bytes to be skipped. 43351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the actual number of bytes skipped. 43451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 43551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 43651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int skipBytes(int n) throws IOException { 43751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski long pos; 43851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski long len; 43951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski long newpos; 44051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 44151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (n <= 0) { 44251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return 0; 44351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 44451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski pos = getFilePointer(); 44551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski len = length(); 44651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski newpos = pos + n; 44751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (newpos > len) { 44851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski newpos = len; 44951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 45051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski seek(newpos); 45151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 45251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /* return the actual number of bytes skipped */ 45351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (int) (newpos - pos); 45451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 45551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 45651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // 'Write' primitives 45751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 45851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 45951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes the specified byte to this file. The write starts at 46051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the current file pointer. 46151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 46251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the <code>byte</code> to be written. 46351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 46451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 46551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void write(int b) throws IOException { 4668d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski scratch[0] = (byte) (b & 0xff); 4678d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski write(scratch, 0, 1); 46851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 46951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 47051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 47151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a sub array as a sequence of bytes. 47251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the data to be written 47351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param off the start offset in the data 47451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the number of bytes that are written 47551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException If an I/O error has occurred. 47651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 47751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private void writeBytes(byte b[], int off, int len) throws IOException { 4788d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski IoBridge.write(fd, b, off, len); 4798d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // if we are in "rws" mode, attempt to sync file+metadata 4808d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (syncMetadata) { 4818d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski fd.sync(); 48251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 48351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 48451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 48551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 48651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes <code>b.length</code> bytes from the specified byte array 48751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * to this file, starting at the current file pointer. 48851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 48951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the data. 49051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 49151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 49251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void write(byte b[]) throws IOException { 49351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeBytes(b, 0, b.length); 49451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 49551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 49651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 49751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes <code>len</code> bytes from the specified byte array 49851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * starting at offset <code>off</code> to this file. 49951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 50051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the data. 50151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param off the start offset in the data. 50251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the number of bytes to write. 50351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 50451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 50551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void write(byte b[], int off, int len) throws IOException { 50651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeBytes(b, off, len); 50751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 50851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 50951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // 'Random access' stuff 51051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 51151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 51251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the current offset in this file. 51351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 51451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the offset from the beginning of the file, in bytes, 51551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * at which the next read or write occurs. 51651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 51751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 5188d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski public long getFilePointer() throws IOException { 5198d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 5208d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski return Libcore.os.lseek(fd, 0L, SEEK_CUR); 5218d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } catch (ErrnoException errnoException) { 5228d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw errnoException.rethrowAsIOException(); 5238d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5248d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 52551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 52651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 52751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Sets the file-pointer offset, measured from the beginning of this 52851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file, at which the next read or write occurs. The offset may be 52951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * set beyond the end of the file. Setting the offset beyond the end 53051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of the file does not change the file length. The file length will 53151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * change only by writing after the offset has been set beyond the end 53251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of the file. 53351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 53451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param pos the offset position, measured in bytes from the 53551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * beginning of the file, at which to set the file 53651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * pointer. 53751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if <code>pos</code> is less than 53851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>0</code> or if an I/O error occurs. 53951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 5408d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski public void seek(long offset) throws IOException { 5418d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (offset < 0) { 5428d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw new IOException("offset < 0: " + offset); 5438d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5448d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 5458d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski Libcore.os.lseek(fd, offset, SEEK_SET); 5468d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } catch (ErrnoException errnoException) { 5478d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw errnoException.rethrowAsIOException(); 5488d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5498d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 55051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 55151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 55251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the length of this file. 55351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 55451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the length of this file, measured in bytes. 55551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 55651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 5578d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski public long length() throws IOException { 5588d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 5598d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski return Libcore.os.fstat(fd).st_size; 5608d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } catch (ErrnoException errnoException) { 5618d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw errnoException.rethrowAsIOException(); 5628d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5638d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 56451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 56551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 56651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Sets the length of this file. 56751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 56851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> If the present length of the file as returned by the 56951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>length</code> method is greater than the <code>newLength</code> 57051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * argument then the file will be truncated. In this case, if the file 57151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * offset as returned by the <code>getFilePointer</code> method is greater 57251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * than <code>newLength</code> then after this method returns the offset 57351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * will be equal to <code>newLength</code>. 57451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 57551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> If the present length of the file as returned by the 57651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>length</code> method is smaller than the <code>newLength</code> 57751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * argument then the file will be extended. In this case, the contents of 57851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the extended portion of the file are not defined. 57951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 58051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param newLength The desired length of the file 58151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException If an I/O error occurs 58251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @since 1.2 58351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 5848d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski public void setLength(long newLength) throws IOException { 5858d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (newLength < 0) { 5868d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw new IllegalArgumentException("newLength < 0"); 5878d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5888d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 5898d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski Libcore.os.ftruncate(fd, newLength); 5908d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } catch (ErrnoException errnoException) { 5918d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw errnoException.rethrowAsIOException(); 5928d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5938d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 5948d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski long filePointer = getFilePointer(); 5958d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (filePointer > newLength) { 5968d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski seek(newLength); 5978d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5988d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // if we are in "rws" mode, attempt to sync file+metadata 5998d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (syncMetadata) { 6008d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski fd.sync(); 6018d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 6028d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 6038d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 60451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 60551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 60651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Closes this random access file stream and releases any system 60751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * resources associated with the stream. A closed random access 60851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file cannot perform input or output operations and cannot be 60951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * reopened. 61051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 61151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> If this file has an associated channel then the channel is closed 61251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * as well. 61351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 61451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 61551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 61651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @revised 1.4 61751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @spec JSR-51 61851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 61951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void close() throws IOException { 6208d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski guard.close(); 62151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski synchronized (closeLock) { 62251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (closed) { 62351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return; 62451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 62551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski closed = true; 62651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 6278d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 6288d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (channel != null && channel.isOpen()) { 62951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski channel.close(); 6308d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski channel = null; 63151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 6328d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski IoBridge.closeAndSignalBlockedThreads(fd); 63351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 63451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 63551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // 63651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // Some "reading/writing Java data types" methods stolen from 63751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // DataInputStream and DataOutputStream. 63851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // 63951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 64051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 64151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a <code>boolean</code> from this file. This method reads a 64251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * single byte from the file, starting at the current file pointer. 64351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * A value of <code>0</code> represents 64451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>false</code>. Any other value represents <code>true</code>. 64551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the byte is read, the end of the stream 64651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is detected, or an exception is thrown. 64751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 64851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the <code>boolean</code> value read. 64951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file has reached the end. 65051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 65151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 65251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final boolean readBoolean() throws IOException { 65351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch = this.read(); 65451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (ch < 0) 65551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 65651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (ch != 0); 65751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 65851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 65951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 66051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a signed eight-bit value from this file. This method reads a 66151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * byte from the file, starting from the current file pointer. 66251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the byte read is <code>b</code>, where 66351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>0 <= b <= 255</code>, 66451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then the result is: 66551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 66651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (byte)(b) 66751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 66851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 66951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the byte is read, the end of the stream 67051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is detected, or an exception is thrown. 67151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 67251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next byte of this file as a signed eight-bit 67351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>byte</code>. 67451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file has reached the end. 67551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 67651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 67751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final byte readByte() throws IOException { 67851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch = this.read(); 67951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (ch < 0) 68051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 68151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (byte)(ch); 68251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 68351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 68451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 68551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads an unsigned eight-bit number from this file. This method reads 68651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * a byte from this file, starting at the current file pointer, 68751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * and returns that byte. 68851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 68951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the byte is read, the end of the stream 69051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is detected, or an exception is thrown. 69151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 69251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next byte of this file, interpreted as an unsigned 69351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * eight-bit number. 69451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file has reached the end. 69551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 69651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 69751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final int readUnsignedByte() throws IOException { 69851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch = this.read(); 69951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (ch < 0) 70051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 70151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return ch; 70251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 70351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 70451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 70551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a signed 16-bit number from this file. The method reads two 70651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * bytes from this file, starting at the current file pointer. 70751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the two bytes read, in order, are 70851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>b1</code> and <code>b2</code>, where each of the two values is 70951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * between <code>0</code> and <code>255</code>, inclusive, then the 71051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * result is equal to: 71151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 71251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (short)((b1 << 8) | b2) 71351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 71451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 71551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the two bytes are read, the end of the 71651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 71751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 71851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next two bytes of this file, interpreted as a signed 71951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 16-bit number. 72051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 72151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * two bytes. 72251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 72351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 72451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final short readShort() throws IOException { 72551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch1 = this.read(); 72651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch2 = this.read(); 72751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((ch1 | ch2) < 0) 72851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 72951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (short)((ch1 << 8) + (ch2 << 0)); 73051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 73151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 73251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 73351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads an unsigned 16-bit number from this file. This method reads 73451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * two bytes from the file, starting at the current file pointer. 73551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the bytes read, in order, are 73651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>b1</code> and <code>b2</code>, where 73751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>0 <= b1, b2 <= 255</code>, 73851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then the result is equal to: 73951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 74051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (b1 << 8) | b2 74151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 74251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 74351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the two bytes are read, the end of the 74451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 74551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 74651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next two bytes of this file, interpreted as an unsigned 74751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 16-bit integer. 74851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 74951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * two bytes. 75051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 75151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 75251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final int readUnsignedShort() throws IOException { 75351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch1 = this.read(); 75451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch2 = this.read(); 75551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((ch1 | ch2) < 0) 75651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 75751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (ch1 << 8) + (ch2 << 0); 75851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 75951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 76051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 76151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a character from this file. This method reads two 76251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * bytes from the file, starting at the current file pointer. 76351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the bytes read, in order, are 76451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>b1</code> and <code>b2</code>, where 76551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>0 <= b1, b2 <= 255</code>, 76651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then the result is equal to: 76751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 76851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (char)((b1 << 8) | b2) 76951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 77051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 77151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the two bytes are read, the end of the 77251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 77351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 77451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next two bytes of this file, interpreted as a 77551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>char</code>. 77651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 77751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * two bytes. 77851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 77951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 78051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final char readChar() throws IOException { 78151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch1 = this.read(); 78251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch2 = this.read(); 78351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((ch1 | ch2) < 0) 78451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 78551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (char)((ch1 << 8) + (ch2 << 0)); 78651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 78751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 78851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 78951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a signed 32-bit integer from this file. This method reads 4 79051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * bytes from the file, starting at the current file pointer. 79151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the bytes read, in order, are <code>b1</code>, 79251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>b2</code>, <code>b3</code>, and <code>b4</code>, where 79351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>0 <= b1, b2, b3, b4 <= 255</code>, 79451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then the result is equal to: 79551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 79651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (b1 << 24) | (b2 << 16) + (b3 << 8) + b4 79751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 79851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 79951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the four bytes are read, the end of the 80051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 80151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 80251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next four bytes of this file, interpreted as an 80351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>int</code>. 80451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 80551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * four bytes. 80651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 80751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 80851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final int readInt() throws IOException { 80951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch1 = this.read(); 81051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch2 = this.read(); 81151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch3 = this.read(); 81251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch4 = this.read(); 81351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((ch1 | ch2 | ch3 | ch4) < 0) 81451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 81551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + (ch4 << 0)); 81651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 81751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 81851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 81951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a signed 64-bit integer from this file. This method reads eight 82051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * bytes from the file, starting at the current file pointer. 82151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the bytes read, in order, are 82251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>b1</code>, <code>b2</code>, <code>b3</code>, 82351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>b4</code>, <code>b5</code>, <code>b6</code>, 82451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>b7</code>, and <code>b8,</code> where: 82551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 82651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 0 <= b1, b2, b3, b4, b5, b6, b7, b8 <=255, 82751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 82851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 82951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then the result is equal to: 83051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p><blockquote><pre> 83151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * ((long)b1 << 56) + ((long)b2 << 48) 83251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * + ((long)b3 << 40) + ((long)b4 << 32) 83351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * + ((long)b5 << 24) + ((long)b6 << 16) 83451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * + ((long)b7 << 8) + b8 83551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 83651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 83751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the eight bytes are read, the end of the 83851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 83951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 84051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next eight bytes of this file, interpreted as a 84151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>long</code>. 84251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 84351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * eight bytes. 84451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 84551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 84651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final long readLong() throws IOException { 84751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return ((long)(readInt()) << 32) + (readInt() & 0xFFFFFFFFL); 84851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 84951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 85051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 85151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a <code>float</code> from this file. This method reads an 85251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>int</code> value, starting at the current file pointer, 85351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * as if by the <code>readInt</code> method 85451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * and then converts that <code>int</code> to a <code>float</code> 85551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * using the <code>intBitsToFloat</code> method in class 85651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>Float</code>. 85751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 85851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the four bytes are read, the end of the 85951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 86051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 86151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next four bytes of this file, interpreted as a 86251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>float</code>. 86351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 86451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * four bytes. 86551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 86651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.io.RandomAccessFile#readInt() 86751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.Float#intBitsToFloat(int) 86851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 86951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final float readFloat() throws IOException { 87051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return Float.intBitsToFloat(readInt()); 87151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 87251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 87351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 87451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a <code>double</code> from this file. This method reads a 87551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>long</code> value, starting at the current file pointer, 87651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * as if by the <code>readLong</code> method 87751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * and then converts that <code>long</code> to a <code>double</code> 87851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * using the <code>longBitsToDouble</code> method in 87951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * class <code>Double</code>. 88051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 88151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the eight bytes are read, the end of the 88251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 88351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 88451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next eight bytes of this file, interpreted as a 88551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>double</code>. 88651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 88751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * eight bytes. 88851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 88951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.io.RandomAccessFile#readLong() 89051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.Double#longBitsToDouble(long) 89151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 89251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final double readDouble() throws IOException { 89351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return Double.longBitsToDouble(readLong()); 89451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 89551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 89651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 89751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads the next line of text from this file. This method successively 89851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * reads bytes from the file, starting at the current file pointer, 89951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * until it reaches a line terminator or the end 90051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of the file. Each byte is converted into a character by taking the 90151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * byte's value for the lower eight bits of the character and setting the 90251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * high eight bits of the character to zero. This method does not, 90351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * therefore, support the full Unicode character set. 90451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 90551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> A line of text is terminated by a carriage-return character 90651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (<code>'\r'</code>), a newline character (<code>'\n'</code>), a 90751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * carriage-return character immediately followed by a newline character, 90851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or the end of the file. Line-terminating characters are discarded and 90951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * are not included as part of the string returned. 91051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 91151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> This method blocks until a newline character is read, a carriage 91251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * return and the byte following it are read (to see if it is a newline), 91351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the end of the file is reached, or an exception is thrown. 91451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 91551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next line of text from this file, or null if end 91651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of file is encountered before even one byte is read. 91751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 91851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 91951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 92051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final String readLine() throws IOException { 92151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski StringBuffer input = new StringBuffer(); 92251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int c = -1; 92351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski boolean eol = false; 92451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 92551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski while (!eol) { 92651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski switch (c = read()) { 92751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski case -1: 92851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski case '\n': 92951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski eol = true; 93051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski break; 93151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski case '\r': 93251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski eol = true; 93351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski long cur = getFilePointer(); 93451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((read()) != '\n') { 93551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski seek(cur); 93651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 93751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski break; 93851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski default: 93951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski input.append((char)c); 94051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski break; 94151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 94251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 94351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 94451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((c == -1) && (input.length() == 0)) { 94551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return null; 94651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 94751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return input.toString(); 94851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 94951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 95051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 95151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads in a string from this file. The string has been encoded 95251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * using a 95351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <a href="DataInput.html#modified-utf-8">modified UTF-8</a> 95451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * format. 95551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 95651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The first two bytes are read, starting from the current file 95751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * pointer, as if by 95851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>readUnsignedShort</code>. This value gives the number of 95951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * following bytes that are in the encoded string, not 96051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the length of the resulting string. The following bytes are then 96151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * interpreted as bytes encoding characters in the modified UTF-8 format 96251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * and are converted into characters. 96351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 96451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until all the bytes are read, the end of the 96551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 96651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 96751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return a Unicode string. 96851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before 96951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * reading all the bytes. 97051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 97151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception UTFDataFormatException if the bytes do not represent 97251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * valid modified UTF-8 encoding of a Unicode string. 97351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.io.RandomAccessFile#readUnsignedShort() 97451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 97551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final String readUTF() throws IOException { 97651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return DataInputStream.readUTF(this); 97751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 97851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 97951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 98051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a <code>boolean</code> to the file as a one-byte value. The 98151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * value <code>true</code> is written out as the value 98251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>(byte)1</code>; the value <code>false</code> is written out 98351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * as the value <code>(byte)0</code>. The write starts at 98451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the current position of the file pointer. 98551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 98651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param v a <code>boolean</code> value to be written. 98751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 98851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 98951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeBoolean(boolean v) throws IOException { 99051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write(v ? 1 : 0); 99151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written++; 99251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 99351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 99451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 99551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a <code>byte</code> to the file as a one-byte value. The 99651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * write starts at the current position of the file pointer. 99751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 99851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param v a <code>byte</code> value to be written. 99951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 100051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 100151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeByte(int v) throws IOException { 100251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write(v); 100351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written++; 100451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 100551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 100651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 100751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a <code>short</code> to the file as two bytes, high byte first. 100851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The write starts at the current position of the file pointer. 100951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 101051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param v a <code>short</code> to be written. 101151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 101251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 101351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeShort(int v) throws IOException { 101451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 8) & 0xFF); 101551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 0) & 0xFF); 101651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written += 2; 101751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 101851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 101951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 102051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a <code>char</code> to the file as a two-byte value, high 102151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * byte first. The write starts at the current position of the 102251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file pointer. 102351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 102451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param v a <code>char</code> value to be written. 102551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 102651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 102751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeChar(int v) throws IOException { 102851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 8) & 0xFF); 102951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 0) & 0xFF); 103051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written += 2; 103151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 103251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 103351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 103451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes an <code>int</code> to the file as four bytes, high byte first. 103551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The write starts at the current position of the file pointer. 103651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 103751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param v an <code>int</code> to be written. 103851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 103951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 104051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeInt(int v) throws IOException { 104151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 24) & 0xFF); 104251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 16) & 0xFF); 104351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 8) & 0xFF); 104451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 0) & 0xFF); 104551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written += 4; 104651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 104751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 104851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 104951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a <code>long</code> to the file as eight bytes, high byte first. 105051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The write starts at the current position of the file pointer. 105151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 105251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param v a <code>long</code> to be written. 105351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 105451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 105551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeLong(long v) throws IOException { 105651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 56) & 0xFF); 105751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 48) & 0xFF); 105851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 40) & 0xFF); 105951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 32) & 0xFF); 106051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 24) & 0xFF); 106151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 16) & 0xFF); 106251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 8) & 0xFF); 106351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 0) & 0xFF); 106451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written += 8; 106551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 106651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 106751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 106851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Converts the float argument to an <code>int</code> using the 106951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>floatToIntBits</code> method in class <code>Float</code>, 107051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * and then writes that <code>int</code> value to the file as a 107151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * four-byte quantity, high byte first. The write starts at the 107251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * current position of the file pointer. 107351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 107451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param v a <code>float</code> value to be written. 107551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 107651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.Float#floatToIntBits(float) 107751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 107851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeFloat(float v) throws IOException { 107951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeInt(Float.floatToIntBits(v)); 108051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 108151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 108251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 108351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Converts the double argument to a <code>long</code> using the 108451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>doubleToLongBits</code> method in class <code>Double</code>, 108551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * and then writes that <code>long</code> value to the file as an 108651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * eight-byte quantity, high byte first. The write starts at the current 108751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * position of the file pointer. 108851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 108951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param v a <code>double</code> value to be written. 109051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 109151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.Double#doubleToLongBits(double) 109251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 109351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeDouble(double v) throws IOException { 109451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeLong(Double.doubleToLongBits(v)); 109551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 109651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 109751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 109851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes the string to the file as a sequence of bytes. Each 109951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * character in the string is written out, in sequence, by discarding 110051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * its high eight bits. The write starts at the current position of 110151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file pointer. 110251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 110351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param s a string of bytes to be written. 110451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 110551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 110651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeBytes(String s) throws IOException { 110751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int len = s.length(); 110851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski byte[] b = new byte[len]; 110951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski s.getBytes(0, len, b, 0); 111051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeBytes(b, 0, len); 111151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 111251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 111351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 111451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a string to the file as a sequence of characters. Each 111551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * character is written to the data output stream as if by the 111651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>writeChar</code> method. The write starts at the current 111751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * position of the file pointer. 111851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 111951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param s a <code>String</code> value to be written. 112051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 112151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.io.RandomAccessFile#writeChar(int) 112251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 112351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeChars(String s) throws IOException { 112451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int clen = s.length(); 112551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int blen = 2*clen; 112651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski byte[] b = new byte[blen]; 112751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski char[] c = new char[clen]; 112851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski s.getChars(0, clen, c, 0); 112951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski for (int i = 0, j = 0; i < clen; i++) { 113051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski b[j++] = (byte)(c[i] >>> 8); 113151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski b[j++] = (byte)(c[i] >>> 0); 113251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 113351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeBytes(b, 0, blen); 113451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 113551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 113651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 113751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a string to the file using 113851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <a href="DataInput.html#modified-utf-8">modified UTF-8</a> 113951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * encoding in a machine-independent manner. 114051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 114151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * First, two bytes are written to the file, starting at the 114251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * current file pointer, as if by the 114351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>writeShort</code> method giving the number of bytes to 114451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * follow. This value is the number of bytes actually written out, 114551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * not the length of the string. Following the length, each character 114651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of the string is output, in sequence, using the modified UTF-8 encoding 114751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * for each character. 114851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 114951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param str a string to be written. 115051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 115151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 115251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeUTF(String str) throws IOException { 115351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski DataOutputStream.writeUTF(str, this); 115451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 115551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 11568d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski @Override protected void finalize() throws Throwable { 11578d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 11588d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (guard != null) { 11598d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski guard.warnIfOpen(); 11608d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 11618d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski close(); 11628d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } finally { 11638d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski super.finalize(); 11648d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 116551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 116651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski} 1167