RandomAccessFile.java revision 9e78cee3f3edf84254174717f475605d712aad1c
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 libcore.io.IoBridge; 348d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebskiimport libcore.io.Libcore; 358d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebskiimport static android.system.OsConstants.*; 3651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 3751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 3851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski/** 3951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Instances of this class support both reading and writing to a 4051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * random access file. A random access file behaves like a large 4151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * array of bytes stored in the file system. There is a kind of cursor, 4251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or index into the implied array, called the <em>file pointer</em>; 4351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * input operations read bytes starting at the file pointer and advance 4451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file pointer past the bytes read. If the random access file is 4551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * created in read/write mode, then output operations are also available; 4651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * output operations write bytes starting at the file pointer and advance 4751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file pointer past the bytes written. Output operations that write 4851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * past the current end of the implied array cause the array to be 4951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * extended. The file pointer can be read by the 5051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>getFilePointer</code> method and set by the <code>seek</code> 5151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * method. 5251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 5351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * It is generally true of all the reading routines in this class that 5451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * if end-of-file is reached before the desired number of bytes has been 5551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * read, an <code>EOFException</code> (which is a kind of 5651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>IOException</code>) is thrown. If any byte cannot be read for 5751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * any reason other than end-of-file, an <code>IOException</code> other 5851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * than <code>EOFException</code> is thrown. In particular, an 5951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>IOException</code> may be thrown if the stream has been closed. 6051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 6151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @author unascribed 6251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @since JDK1.0 6351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 6451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 6551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskipublic class RandomAccessFile implements DataOutput, DataInput, Closeable { 6651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 678d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski private final CloseGuard guard = CloseGuard.get(); 688d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski private final byte[] scratch = new byte[8]; 698d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski private boolean syncMetadata = false; 708d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski private int mode; 718d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 7251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private FileDescriptor fd; 7351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private FileChannel channel = null; 7451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private boolean rw; 7551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 7651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /* The path of the referenced file */ 7751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private final String path; 7851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 7951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private Object closeLock = new Object(); 8051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private volatile boolean closed = false; 8151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 8251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 8351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Creates a random access file stream to read from, and optionally 8451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * to write to, a file with the specified name. A new 8551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * {@link FileDescriptor} object is created to represent the 8651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * connection to the file. 8751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 8851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> The <tt>mode</tt> argument specifies the access mode with which the 8951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file is to be opened. The permitted values and their meanings are as 9051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * specified for the <a 9151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * href="#mode"><tt>RandomAccessFile(File,String)</tt></a> constructor. 9251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 9351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 9451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If there is a security manager, its <code>checkRead</code> method 9551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is called with the <code>name</code> argument 9651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * as its argument to see if read access to the file is allowed. 9751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the mode allows writing, the security manager's 9851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>checkWrite</code> method 9951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is also called with the <code>name</code> argument 10051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * as its argument to see if write access to the file is allowed. 10151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 10251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param name the system-dependent filename 10351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param mode the access <a href="#mode">mode</a> 10451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IllegalArgumentException if the mode argument is not equal 10551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * to one of <tt>"r"</tt>, <tt>"rw"</tt>, <tt>"rws"</tt>, or 10651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>"rwd"</tt> 10751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception FileNotFoundException 10851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * if the mode is <tt>"r"</tt> but the given string does not 10951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * denote an existing regular file, or if the mode begins with 11051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>"rw"</tt> but the given string does not denote an 11151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * existing, writable regular file and a new regular file of 11251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * that name cannot be created, or if some other error occurs 11351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * while opening or creating the file 11451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception SecurityException if a security manager exists and its 11551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>checkRead</code> method denies read access to the file 11651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or the mode is "rw" and the security manager's 11751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>checkWrite</code> method denies write access to the file 11851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.SecurityException 11951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.SecurityManager#checkRead(java.lang.String) 12051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.SecurityManager#checkWrite(java.lang.String) 12151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @revised 1.4 12251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @spec JSR-51 12351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 12451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public RandomAccessFile(String name, String mode) 12551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throws FileNotFoundException 12651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski { 12751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski this(name != null ? new File(name) : null, mode); 12851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 12951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 13051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 13151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Creates a random access file stream to read from, and optionally to 13251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * write to, the file specified by the {@link File} argument. A new {@link 13351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * FileDescriptor} object is created to represent this file connection. 13451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 13551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <a name="mode"><p> The <tt>mode</tt> argument specifies the access mode 13651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * in which the file is to be opened. The permitted values and their 13751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * meanings are: 13851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 13951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><table summary="Access mode permitted values and meanings"> 14051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tr><th><p align="left">Value</p></th><th><p align="left">Meaning</p></th></tr> 14151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tr><td valign="top"><tt>"r"</tt></td> 14251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <td> Open for reading only. Invoking any of the <tt>write</tt> 14351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * methods of the resulting object will cause an {@link 14451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * java.io.IOException} to be thrown. </td></tr> 14551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tr><td valign="top"><tt>"rw"</tt></td> 14651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <td> Open for reading and writing. If the file does not already 14751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * exist then an attempt will be made to create it. </td></tr> 14851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tr><td valign="top"><tt>"rws"</tt></td> 14951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <td> Open for reading and writing, as with <tt>"rw"</tt>, and also 15051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * require that every update to the file's content or metadata be 15151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * written synchronously to the underlying storage device. </td></tr> 15251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tr><td valign="top"><tt>"rwd" </tt></td> 15351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <td> Open for reading and writing, as with <tt>"rw"</tt>, and also 15451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * require that every update to the file's content be written 15551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * synchronously to the underlying storage device. </td></tr> 15651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </table></blockquote> 15751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 15851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The <tt>"rws"</tt> and <tt>"rwd"</tt> modes work much like the {@link 15951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * java.nio.channels.FileChannel#force(boolean) force(boolean)} method of 16051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the {@link java.nio.channels.FileChannel} class, passing arguments of 16151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>true</tt> and <tt>false</tt>, respectively, except that they always 16251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * apply to every I/O operation and are therefore often more efficient. If 16351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file resides on a local storage device then when an invocation of a 16451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * method of this class returns it is guaranteed that all changes made to 16551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file by that invocation will have been written to that device. This 16651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is useful for ensuring that critical information is not lost in the 16751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * event of a system crash. If the file does not reside on a local device 16851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then no such guarantee is made. 16951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 17051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> The <tt>"rwd"</tt> mode can be used to reduce the number of I/O 17151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * operations performed. Using <tt>"rwd"</tt> only requires updates to the 17251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file's content to be written to storage; using <tt>"rws"</tt> requires 17351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * updates to both the file's content and its metadata to be written, which 17451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * generally requires at least one more low-level I/O operation. 17551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 17651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> If there is a security manager, its <code>checkRead</code> method is 17751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * called with the pathname of the <code>file</code> argument as its 17851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * argument to see if read access to the file is allowed. If the mode 17951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * allows writing, the security manager's <code>checkWrite</code> method is 18051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * also called with the path argument to see if write access to the file is 18151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * allowed. 18251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 18351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param file the file object 18451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param mode the access mode, as described 18551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <a href="#mode">above</a> 18651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IllegalArgumentException if the mode argument is not equal 18751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * to one of <tt>"r"</tt>, <tt>"rw"</tt>, <tt>"rws"</tt>, or 18851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <tt>"rwd"</tt> 18951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception FileNotFoundException 19051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * if the mode is <tt>"r"</tt> but the given file object does 19151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * not denote an existing regular file, or if the mode begins 19251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * with <tt>"rw"</tt> but the given file object does not denote 19351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * an existing, writable regular file and a new regular file of 19451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * that name cannot be created, or if some other error occurs 19551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * while opening or creating the file 19651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception SecurityException if a security manager exists and its 19751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>checkRead</code> method denies read access to the file 19851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or the mode is "rw" and the security manager's 19951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>checkWrite</code> method denies write access to the file 20051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.SecurityManager#checkRead(java.lang.String) 20151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.SecurityManager#checkWrite(java.lang.String) 20251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.nio.channels.FileChannel#force(boolean) 20351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @revised 1.4 20451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @spec JSR-51 20551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 20651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public RandomAccessFile(File file, String mode) 20751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throws FileNotFoundException 20851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski { 20951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski String name = (file != null ? file.getPath() : null); 2108d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski this.mode = -1; 2118d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (mode.equals("r")) { 2128d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski this.mode = O_RDONLY; 2138d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } else if (mode.startsWith("rw")) { 2148d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // Android changed: Added. O_CREAT 2158d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski this.mode = O_RDWR | O_CREAT; 21651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski rw = true; 21751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (mode.length() > 2) { 2188d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (mode.equals("rws")) { 2198d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski syncMetadata = true; 2208d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } else if (mode.equals("rwd")) { 2218d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // Android-changeD: Should this be O_DSYNC and the above O_SYNC ? 2228d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski this.mode |= O_SYNC; 2238d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } else { 2248d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski this.mode = -1; 2258d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 22651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 22751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 2288d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 2298d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (this.mode < 0) { 23051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new IllegalArgumentException("Illegal mode \"" + mode 23151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski + "\" must be one of " 23251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski + "\"r\", \"rw\", \"rws\"," 23351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski + " or \"rwd\""); 23451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 2358d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 23651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (name == null) { 2378d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw new NullPointerException("file == null"); 23851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 2398d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 24051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (file.isInvalid()) { 24151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new FileNotFoundException("Invalid file path"); 24251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 24351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski this.path = name; 2448d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 2458d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // Android-changed: Use IoBridge.open() instead of open. 2468d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski fd = IoBridge.open(file.getPath(), this.mode); 2478d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (syncMetadata) { 2488d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 2498d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski fd.sync(); 2508d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } catch (IOException e) { 2518d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // Ignored 2528d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 2538d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 2548d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski guard.open("close"); 25551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 25651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 25751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 25851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the opaque file descriptor object associated with this 25951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream. </p> 26051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 26151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the file descriptor object associated with this stream. 26251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 26351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.io.FileDescriptor 26451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 26551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final FileDescriptor getFD() throws IOException { 26651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (fd != null) return fd; 26751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new IOException(); 26851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 26951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 27051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 27151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the unique {@link java.nio.channels.FileChannel FileChannel} 27251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * object associated with this file. 27351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 27451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> The {@link java.nio.channels.FileChannel#position() 27551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </code>position<code>} of the returned channel will always be equal to 27651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * this object's file-pointer offset as returned by the {@link 27751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * #getFilePointer getFilePointer} method. Changing this object's 27851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file-pointer offset, whether explicitly or by reading or writing bytes, 27951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * will change the position of the channel, and vice versa. Changing the 28051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file's length via this object will change the length seen via the file 28151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * channel, and vice versa. 28251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 28351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the file channel associated with this file 28451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 28551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @since 1.4 28651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @spec JSR-51 28751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 28851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final FileChannel getChannel() { 28951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski synchronized (this) { 29051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (channel == null) { 2910f7f0c999e751ab883a247e1409dcc8730c87b9fPrzemyslaw Szczepaniak channel = FileChannelImpl.open(fd, path, true, rw, this); 2920f7f0c999e751ab883a247e1409dcc8730c87b9fPrzemyslaw Szczepaniak /* 2930f7f0c999e751ab883a247e1409dcc8730c87b9fPrzemyslaw Szczepaniak * FileDescriptor could be shared by FileInputStream or 2940f7f0c999e751ab883a247e1409dcc8730c87b9fPrzemyslaw Szczepaniak * FileOutputStream. 2950f7f0c999e751ab883a247e1409dcc8730c87b9fPrzemyslaw Szczepaniak * Ensure that FD is GC'ed only when all the streams/channels 2960f7f0c999e751ab883a247e1409dcc8730c87b9fPrzemyslaw Szczepaniak * are done using it. 2970f7f0c999e751ab883a247e1409dcc8730c87b9fPrzemyslaw Szczepaniak * Increment fd's use count. Invoking the channel's close() 2980f7f0c999e751ab883a247e1409dcc8730c87b9fPrzemyslaw Szczepaniak * method will result in decrementing the use count set for 2990f7f0c999e751ab883a247e1409dcc8730c87b9fPrzemyslaw Szczepaniak * the channel. 3000f7f0c999e751ab883a247e1409dcc8730c87b9fPrzemyslaw Szczepaniak */ 3010f7f0c999e751ab883a247e1409dcc8730c87b9fPrzemyslaw Szczepaniak // fd.incrementAndGetUseCount(); 30251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 30351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return channel; 30451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 30551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 30651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 30751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 30851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a byte of data from this file. The byte is returned as an 30951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * integer in the range 0 to 255 (<code>0x00-0x0ff</code>). This 31051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * method blocks if no input is yet available. 31151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 31251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Although <code>RandomAccessFile</code> is not a subclass of 31351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>InputStream</code>, this method behaves in exactly the same 31451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * way as the {@link InputStream#read()} method of 31551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>InputStream</code>. 31651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 31751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next byte of data, or <code>-1</code> if the end of the 31851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file has been reached. 31951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. Not thrown if 32051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * end-of-file has been reached. 32151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 32251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int read() throws IOException { 3238d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski return (read(scratch, 0, 1) != -1) ? scratch[0] & 0xff : -1; 32451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 32551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 32651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 32751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a sub array as a sequence of bytes. 32851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the buffer into which the data is read. 32951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param off the start offset of the data. 33051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the number of bytes to read. 33151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException If an I/O error has occurred. 33251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 33351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private int readBytes(byte b[], int off, int len) throws IOException { 3348d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski return IoBridge.read(fd, b, off, len); 33551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 33651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 33751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 33851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads up to <code>len</code> bytes of data from this file into an 33951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * array of bytes. This method blocks until at least one byte of input 34051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is available. 34151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 34251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Although <code>RandomAccessFile</code> is not a subclass of 34351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>InputStream</code>, this method behaves in exactly the 34451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * same way as the {@link InputStream#read(byte[], int, int)} method of 34551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>InputStream</code>. 34651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 34751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the buffer into which the data is read. 34851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param off the start offset in array <code>b</code> 34951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * at which the data is written. 35051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the maximum number of bytes read. 35151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the total number of bytes read into the buffer, or 35251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>-1</code> if there is no more data because the end of 35351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file has been reached. 35451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException If the first byte cannot be read for any reason 35551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * other than end of file, or if the random access file has been closed, or if 35651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * some other I/O error occurs. 35751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception NullPointerException If <code>b</code> is <code>null</code>. 35851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IndexOutOfBoundsException If <code>off</code> is negative, 35951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>len</code> is negative, or <code>len</code> is greater than 36051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>b.length - off</code> 36151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 36251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int read(byte b[], int off, int len) throws IOException { 36351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return readBytes(b, off, len); 36451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 36551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 36651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 36751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads up to <code>b.length</code> bytes of data from this file 36851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * into an array of bytes. This method blocks until at least one byte 36951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of input is available. 37051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 37151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Although <code>RandomAccessFile</code> is not a subclass of 37251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>InputStream</code>, this method behaves in exactly the 37351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * same way as the {@link InputStream#read(byte[])} method of 37451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>InputStream</code>. 37551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 37651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the buffer into which the data is read. 37751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the total number of bytes read into the buffer, or 37851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>-1</code> if there is no more data because the end of 37951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * this file has been reached. 38051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException If the first byte cannot be read for any reason 38151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * other than end of file, or if the random access file has been closed, or if 38251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * some other I/O error occurs. 38351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception NullPointerException If <code>b</code> is <code>null</code>. 38451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 38551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int read(byte b[]) throws IOException { 38651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return readBytes(b, 0, b.length); 38751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 38851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 38951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 39051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads <code>b.length</code> bytes from this file into the byte 39151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * array, starting at the current file pointer. This method reads 39251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * repeatedly from the file until the requested number of bytes are 39351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * read. This method blocks until the requested number of bytes are 39451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * read, the end of the stream is detected, or an exception is thrown. 39551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 39651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the buffer into which the data is read. 39751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 39851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * all the bytes. 39951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 40051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 40151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void readFully(byte b[]) throws IOException { 40251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski readFully(b, 0, b.length); 40351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 40451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 40551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 40651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads exactly <code>len</code> bytes from this file into the byte 40751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * array, starting at the current file pointer. This method reads 40851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * repeatedly from the file until the requested number of bytes are 40951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * read. This method blocks until the requested number of bytes are 41051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * read, the end of the stream is detected, or an exception is thrown. 41151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 41251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the buffer into which the data is read. 41351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param off the start offset of the data. 41451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the number of bytes to read. 41551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 41651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * all the bytes. 41751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 41851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 41951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void readFully(byte b[], int off, int len) throws IOException { 42051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int n = 0; 42151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski do { 42251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int count = this.read(b, off + n, len - n); 42351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (count < 0) 42451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 42551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski n += count; 42651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } while (n < len); 42751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 42851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 42951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 43051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Attempts to skip over <code>n</code> bytes of input discarding the 43151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * skipped bytes. 43251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 43351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 43451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method may skip over some smaller number of bytes, possibly zero. 43551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This may result from any of a number of conditions; reaching end of 43651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file before <code>n</code> bytes have been skipped is only one 43751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * possibility. This method never throws an <code>EOFException</code>. 43851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The actual number of bytes skipped is returned. If <code>n</code> 43951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is negative, no bytes are skipped. 44051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 44151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param n the number of bytes to be skipped. 44251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the actual number of bytes skipped. 44351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 44451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 44551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public int skipBytes(int n) throws IOException { 44651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski long pos; 44751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski long len; 44851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski long newpos; 44951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 45051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (n <= 0) { 45151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return 0; 45251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 45351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski pos = getFilePointer(); 45451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski len = length(); 45551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski newpos = pos + n; 45651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (newpos > len) { 45751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski newpos = len; 45851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 45951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski seek(newpos); 46051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 46151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /* return the actual number of bytes skipped */ 46251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (int) (newpos - pos); 46351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 46451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 46551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // 'Write' primitives 46651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 46751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 46851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes the specified byte to this file. The write starts at 46951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the current file pointer. 47051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 47151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the <code>byte</code> to be written. 47251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 47351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 47451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void write(int b) throws IOException { 4758d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski scratch[0] = (byte) (b & 0xff); 4768d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski write(scratch, 0, 1); 47751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 47851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 47951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 48051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a sub array as a sequence of bytes. 48151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the data to be written 48251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param off the start offset in the data 48351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the number of bytes that are written 48451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException If an I/O error has occurred. 48551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 48651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private void writeBytes(byte b[], int off, int len) throws IOException { 4878d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski IoBridge.write(fd, b, off, len); 4888d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // if we are in "rws" mode, attempt to sync file+metadata 4898d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (syncMetadata) { 4908d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski fd.sync(); 49151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 49251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 49351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 49451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 49551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes <code>b.length</code> bytes from the specified byte array 49651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * to this file, starting at the current file pointer. 49751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 49851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the data. 49951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 50051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 50151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void write(byte b[]) throws IOException { 50251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeBytes(b, 0, b.length); 50351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 50451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 50551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 50651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes <code>len</code> bytes from the specified byte array 50751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * starting at offset <code>off</code> to this file. 50851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 50951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param b the data. 51051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param off the start offset in the data. 51151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param len the number of bytes to write. 51251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 51351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 51451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void write(byte b[], int off, int len) throws IOException { 51551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeBytes(b, off, len); 51651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 51751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 51851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // 'Random access' stuff 51951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 52051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 52151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the current offset in this file. 52251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 52351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the offset from the beginning of the file, in bytes, 52451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * at which the next read or write occurs. 52551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 52651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 5278d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski public long getFilePointer() throws IOException { 5288d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 5298d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski return Libcore.os.lseek(fd, 0L, SEEK_CUR); 5308d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } catch (ErrnoException errnoException) { 5318d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw errnoException.rethrowAsIOException(); 5328d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5338d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 53451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 53551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 53651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Sets the file-pointer offset, measured from the beginning of this 53751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file, at which the next read or write occurs. The offset may be 53851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * set beyond the end of the file. Setting the offset beyond the end 53951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of the file does not change the file length. The file length will 54051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * change only by writing after the offset has been set beyond the end 54151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of the file. 54251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 5439e78cee3f3edf84254174717f475605d712aad1cNarayan Kamath * @param offset the offset position, measured in bytes from the 54451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * beginning of the file, at which to set the file 54551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * pointer. 54651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if <code>pos</code> is less than 54751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>0</code> or if an I/O error occurs. 54851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 5498d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski public void seek(long offset) throws IOException { 5508d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (offset < 0) { 5518d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw new IOException("offset < 0: " + offset); 5528d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5538d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 5548d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski Libcore.os.lseek(fd, offset, SEEK_SET); 5558d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } catch (ErrnoException errnoException) { 5568d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw errnoException.rethrowAsIOException(); 5578d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5588d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 55951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 56051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 56151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Returns the length of this file. 56251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 56351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the length of this file, measured in bytes. 56451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 56551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 5668d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski public long length() throws IOException { 5678d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 5688d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski return Libcore.os.fstat(fd).st_size; 5698d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } catch (ErrnoException errnoException) { 5708d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw errnoException.rethrowAsIOException(); 5718d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5728d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 57351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 57451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 57551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Sets the length of this file. 57651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 57751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> If the present length of the file as returned by the 57851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>length</code> method is greater than the <code>newLength</code> 57951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * argument then the file will be truncated. In this case, if the file 58051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * offset as returned by the <code>getFilePointer</code> method is greater 58151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * than <code>newLength</code> then after this method returns the offset 58251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * will be equal to <code>newLength</code>. 58351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 58451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> If the present length of the file as returned by the 58551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>length</code> method is smaller than the <code>newLength</code> 58651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * argument then the file will be extended. In this case, the contents of 58751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the extended portion of the file are not defined. 58851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 58951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param newLength The desired length of the file 59051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException If an I/O error occurs 59151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @since 1.2 59251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 5938d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski public void setLength(long newLength) throws IOException { 5948d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (newLength < 0) { 5958d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw new IllegalArgumentException("newLength < 0"); 5968d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 5978d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 5988d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski Libcore.os.ftruncate(fd, newLength); 5998d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } catch (ErrnoException errnoException) { 6008d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski throw errnoException.rethrowAsIOException(); 6018d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 6028d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 6038d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski long filePointer = getFilePointer(); 6048d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (filePointer > newLength) { 6058d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski seek(newLength); 6068d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 6078d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski // if we are in "rws" mode, attempt to sync file+metadata 6088d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (syncMetadata) { 6098d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski fd.sync(); 6108d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 6118d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 6128d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 61351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 61451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 61551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Closes this random access file stream and releases any system 61651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * resources associated with the stream. A closed random access 61751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file cannot perform input or output operations and cannot be 61851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * reopened. 61951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 62051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> If this file has an associated channel then the channel is closed 62151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * as well. 62251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 62351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 62451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 62551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @revised 1.4 62651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @spec JSR-51 62751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 62851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public void close() throws IOException { 6298d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski guard.close(); 63051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski synchronized (closeLock) { 63151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (closed) { 63251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return; 63351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 63451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski closed = true; 63551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 6368d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski 6378d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (channel != null && channel.isOpen()) { 63851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski channel.close(); 6398d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski channel = null; 64051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 6418d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski IoBridge.closeAndSignalBlockedThreads(fd); 64251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 64351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 64451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // 64551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // Some "reading/writing Java data types" methods stolen from 64651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // DataInputStream and DataOutputStream. 64751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // 64851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 64951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 65051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a <code>boolean</code> from this file. This method reads a 65151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * single byte from the file, starting at the current file pointer. 65251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * A value of <code>0</code> represents 65351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>false</code>. Any other value represents <code>true</code>. 65451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the byte is read, the end of the stream 65551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is detected, or an exception is thrown. 65651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 65751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the <code>boolean</code> value read. 65851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file has reached the end. 65951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 66051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 66151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final boolean readBoolean() throws IOException { 66251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch = this.read(); 66351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (ch < 0) 66451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 66551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (ch != 0); 66651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 66751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 66851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 66951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a signed eight-bit value from this file. This method reads a 67051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * byte from the file, starting from the current file pointer. 67151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the byte read is <code>b</code>, where 67251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>0 <= b <= 255</code>, 67351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then the result is: 67451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 67551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (byte)(b) 67651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 67751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 67851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the byte is read, the end of the stream 67951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is detected, or an exception is thrown. 68051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 68151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next byte of this file as a signed eight-bit 68251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>byte</code>. 68351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file has reached the end. 68451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 68551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 68651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final byte readByte() throws IOException { 68751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch = this.read(); 68851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (ch < 0) 68951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 69051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (byte)(ch); 69151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 69251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 69351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 69451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads an unsigned eight-bit number from this file. This method reads 69551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * a byte from this file, starting at the current file pointer, 69651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * and returns that byte. 69751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 69851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the byte is read, the end of the stream 69951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * is detected, or an exception is thrown. 70051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 70151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next byte of this file, interpreted as an unsigned 70251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * eight-bit number. 70351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file has reached the end. 70451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 70551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 70651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final int readUnsignedByte() throws IOException { 70751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch = this.read(); 70851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (ch < 0) 70951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 71051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return ch; 71151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 71251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 71351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 71451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a signed 16-bit number from this file. The method reads two 71551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * bytes from this file, starting at the current file pointer. 71651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the two bytes read, in order, are 71751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>b1</code> and <code>b2</code>, where each of the two values is 71851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * between <code>0</code> and <code>255</code>, inclusive, then the 71951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * result is equal to: 72051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 72151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (short)((b1 << 8) | b2) 72251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 72351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 72451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the two bytes are read, the end of the 72551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 72651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 72751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next two bytes of this file, interpreted as a signed 72851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 16-bit number. 72951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 73051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * two bytes. 73151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 73251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 73351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final short readShort() throws IOException { 73451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch1 = this.read(); 73551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch2 = this.read(); 73651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((ch1 | ch2) < 0) 73751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 73851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (short)((ch1 << 8) + (ch2 << 0)); 73951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 74051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 74151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 74251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads an unsigned 16-bit number from this file. This method reads 74351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * two bytes from the file, starting at the current file pointer. 74451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the bytes read, in order, are 74551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>b1</code> and <code>b2</code>, where 74651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>0 <= b1, b2 <= 255</code>, 74751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then the result is equal to: 74851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 74951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (b1 << 8) | b2 75051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 75151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 75251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the two bytes are read, the end of the 75351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 75451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 75551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next two bytes of this file, interpreted as an unsigned 75651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 16-bit integer. 75751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 75851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * two bytes. 75951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 76051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 76151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final int readUnsignedShort() throws IOException { 76251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch1 = this.read(); 76351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch2 = this.read(); 76451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((ch1 | ch2) < 0) 76551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 76651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (ch1 << 8) + (ch2 << 0); 76751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 76851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 76951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 77051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a character from this file. This method reads two 77151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * bytes from the file, starting at the current file pointer. 77251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the bytes read, in order, are 77351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>b1</code> and <code>b2</code>, where 77451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>0 <= b1, b2 <= 255</code>, 77551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then the result is equal to: 77651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 77751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (char)((b1 << 8) | b2) 77851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 77951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 78051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the two bytes are read, the end of the 78151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 78251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 78351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next two bytes of this file, interpreted as a 78451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>char</code>. 78551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 78651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * two bytes. 78751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 78851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 78951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final char readChar() throws IOException { 79051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch1 = this.read(); 79151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch2 = this.read(); 79251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((ch1 | ch2) < 0) 79351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 79451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (char)((ch1 << 8) + (ch2 << 0)); 79551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 79651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 79751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 79851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a signed 32-bit integer from this file. This method reads 4 79951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * bytes from the file, starting at the current file pointer. 80051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the bytes read, in order, are <code>b1</code>, 80151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>b2</code>, <code>b3</code>, and <code>b4</code>, where 80251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>0 <= b1, b2, b3, b4 <= 255</code>, 80351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then the result is equal to: 80451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 80551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (b1 << 24) | (b2 << 16) + (b3 << 8) + b4 80651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 80751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 80851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the four bytes are read, the end of the 80951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 81051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 81151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next four bytes of this file, interpreted as an 81251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>int</code>. 81351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 81451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * four bytes. 81551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 81651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 81751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final int readInt() throws IOException { 81851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch1 = this.read(); 81951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch2 = this.read(); 82051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch3 = this.read(); 82151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int ch4 = this.read(); 82251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((ch1 | ch2 | ch3 | ch4) < 0) 82351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throw new EOFException(); 82451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + (ch4 << 0)); 82551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 82651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 82751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 82851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a signed 64-bit integer from this file. This method reads eight 82951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * bytes from the file, starting at the current file pointer. 83051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the bytes read, in order, are 83151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>b1</code>, <code>b2</code>, <code>b3</code>, 83251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>b4</code>, <code>b5</code>, <code>b6</code>, 83351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>b7</code>, and <code>b8,</code> where: 83451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <blockquote><pre> 83551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 0 <= b1, b2, b3, b4, b5, b6, b7, b8 <=255, 83651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 83751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 83851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * then the result is equal to: 83951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p><blockquote><pre> 84051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * ((long)b1 << 56) + ((long)b2 << 48) 84151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * + ((long)b3 << 40) + ((long)b4 << 32) 84251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * + ((long)b5 << 24) + ((long)b6 << 16) 84351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * + ((long)b7 << 8) + b8 84451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * </pre></blockquote> 84551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 84651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the eight bytes are read, the end of the 84751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 84851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 84951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next eight bytes of this file, interpreted as a 85051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>long</code>. 85151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 85251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * eight bytes. 85351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 85451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 85551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final long readLong() throws IOException { 85651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return ((long)(readInt()) << 32) + (readInt() & 0xFFFFFFFFL); 85751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 85851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 85951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 86051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a <code>float</code> from this file. This method reads an 86151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>int</code> value, starting at the current file pointer, 86251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * as if by the <code>readInt</code> method 86351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * and then converts that <code>int</code> to a <code>float</code> 86451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * using the <code>intBitsToFloat</code> method in class 86551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>Float</code>. 86651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 86751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the four bytes are read, the end of the 86851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 86951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 87051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next four bytes of this file, interpreted as a 87151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>float</code>. 87251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 87351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * four bytes. 87451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 87551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.io.RandomAccessFile#readInt() 87651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.Float#intBitsToFloat(int) 87751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 87851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final float readFloat() throws IOException { 87951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return Float.intBitsToFloat(readInt()); 88051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 88151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 88251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 88351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads a <code>double</code> from this file. This method reads a 88451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>long</code> value, starting at the current file pointer, 88551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * as if by the <code>readLong</code> method 88651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * and then converts that <code>long</code> to a <code>double</code> 88751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * using the <code>longBitsToDouble</code> method in 88851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * class <code>Double</code>. 88951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 89051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until the eight bytes are read, the end of the 89151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 89251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 89351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next eight bytes of this file, interpreted as a 89451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>double</code>. 89551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before reading 89651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * eight bytes. 89751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 89851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.io.RandomAccessFile#readLong() 89951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.Double#longBitsToDouble(long) 90051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 90151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final double readDouble() throws IOException { 90251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return Double.longBitsToDouble(readLong()); 90351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 90451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 90551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 90651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads the next line of text from this file. This method successively 90751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * reads bytes from the file, starting at the current file pointer, 90851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * until it reaches a line terminator or the end 90951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of the file. Each byte is converted into a character by taking the 91051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * byte's value for the lower eight bits of the character and setting the 91151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * high eight bits of the character to zero. This method does not, 91251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * therefore, support the full Unicode character set. 91351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 91451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> A line of text is terminated by a carriage-return character 91551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * (<code>'\r'</code>), a newline character (<code>'\n'</code>), a 91651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * carriage-return character immediately followed by a newline character, 91751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or the end of the file. Line-terminating characters are discarded and 91851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * are not included as part of the string returned. 91951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 92051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> This method blocks until a newline character is read, a carriage 92151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * return and the byte following it are read (to see if it is a newline), 92251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the end of the file is reached, or an exception is thrown. 92351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 92451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the next line of text from this file, or null if end 92551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of file is encountered before even one byte is read. 92651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 92751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 92851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 92951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final String readLine() throws IOException { 93051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski StringBuffer input = new StringBuffer(); 93151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int c = -1; 93251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski boolean eol = false; 93351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 93451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski while (!eol) { 93551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski switch (c = read()) { 93651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski case -1: 93751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski case '\n': 93851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski eol = true; 93951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski break; 94051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski case '\r': 94151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski eol = true; 94251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski long cur = getFilePointer(); 94351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((read()) != '\n') { 94451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski seek(cur); 94551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 94651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski break; 94751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski default: 94851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski input.append((char)c); 94951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski break; 95051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 95151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 95251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 95351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if ((c == -1) && (input.length() == 0)) { 95451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return null; 95551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 95651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return input.toString(); 95751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 95851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 95951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 96051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Reads in a string from this file. The string has been encoded 96151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * using a 96251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <a href="DataInput.html#modified-utf-8">modified UTF-8</a> 96351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * format. 96451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 96551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The first two bytes are read, starting from the current file 96651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * pointer, as if by 96751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>readUnsignedShort</code>. This value gives the number of 96851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * following bytes that are in the encoded string, not 96951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the length of the resulting string. The following bytes are then 97051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * interpreted as bytes encoding characters in the modified UTF-8 format 97151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * and are converted into characters. 97251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 97351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This method blocks until all the bytes are read, the end of the 97451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * stream is detected, or an exception is thrown. 97551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 97651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return a Unicode string. 97751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception EOFException if this file reaches the end before 97851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * reading all the bytes. 97951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 98051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception UTFDataFormatException if the bytes do not represent 98151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * valid modified UTF-8 encoding of a Unicode string. 98251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.io.RandomAccessFile#readUnsignedShort() 98351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 98451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final String readUTF() throws IOException { 98551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return DataInputStream.readUTF(this); 98651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 98751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 98851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 98951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a <code>boolean</code> to the file as a one-byte value. The 99051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * value <code>true</code> is written out as the value 99151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>(byte)1</code>; the value <code>false</code> is written out 99251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * as the value <code>(byte)0</code>. The write starts at 99351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the current position of the file pointer. 99451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 99551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param v a <code>boolean</code> value to be written. 99651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 99751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 99851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeBoolean(boolean v) throws IOException { 99951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write(v ? 1 : 0); 100051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written++; 100151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 100251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 100351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 100451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a <code>byte</code> to the file as a one-byte value. The 100551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * write starts at the current position of the file pointer. 100651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 100751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param v a <code>byte</code> value to be written. 100851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 100951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 101051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeByte(int v) throws IOException { 101151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write(v); 101251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written++; 101351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 101451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 101551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 101651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a <code>short</code> to the file as two bytes, high byte first. 101751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The write starts at the current position of the file pointer. 101851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 101951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param v a <code>short</code> to be written. 102051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 102151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 102251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeShort(int v) throws IOException { 102351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 8) & 0xFF); 102451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 0) & 0xFF); 102551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written += 2; 102651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 102751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 102851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 102951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a <code>char</code> to the file as a two-byte value, high 103051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * byte first. The write starts at the current position of the 103151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * file pointer. 103251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 103351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param v a <code>char</code> value to be written. 103451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 103551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 103651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeChar(int v) throws IOException { 103751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 8) & 0xFF); 103851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 0) & 0xFF); 103951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written += 2; 104051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 104151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 104251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 104351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes an <code>int</code> to the file as four bytes, high byte first. 104451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The write starts at the current position of the file pointer. 104551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 104651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param v an <code>int</code> to be written. 104751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 104851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 104951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeInt(int v) throws IOException { 105051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 24) & 0xFF); 105151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 16) & 0xFF); 105251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 8) & 0xFF); 105351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((v >>> 0) & 0xFF); 105451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written += 4; 105551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 105651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 105751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 105851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a <code>long</code> to the file as eight bytes, high byte first. 105951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * The write starts at the current position of the file pointer. 106051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 106151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param v a <code>long</code> to be written. 106251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 106351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 106451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeLong(long v) throws IOException { 106551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 56) & 0xFF); 106651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 48) & 0xFF); 106751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 40) & 0xFF); 106851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 32) & 0xFF); 106951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 24) & 0xFF); 107051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 16) & 0xFF); 107151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 8) & 0xFF); 107251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski write((int)(v >>> 0) & 0xFF); 107351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski //written += 8; 107451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 107551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 107651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 107751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Converts the float argument to an <code>int</code> using the 107851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>floatToIntBits</code> method in class <code>Float</code>, 107951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * and then writes that <code>int</code> value to the file as a 108051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * four-byte quantity, high byte first. The write starts at the 108151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * current position of the file pointer. 108251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 108351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param v a <code>float</code> value to be written. 108451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 108551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.Float#floatToIntBits(float) 108651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 108751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeFloat(float v) throws IOException { 108851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeInt(Float.floatToIntBits(v)); 108951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 109051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 109151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 109251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Converts the double argument to a <code>long</code> using the 109351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>doubleToLongBits</code> method in class <code>Double</code>, 109451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * and then writes that <code>long</code> value to the file as an 109551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * eight-byte quantity, high byte first. The write starts at the current 109651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * position of the file pointer. 109751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 109851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param v a <code>double</code> value to be written. 109951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 110051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.lang.Double#doubleToLongBits(double) 110151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 110251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeDouble(double v) throws IOException { 110351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeLong(Double.doubleToLongBits(v)); 110451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 110551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 110651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 110751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes the string to the file as a sequence of bytes. Each 110851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * character in the string is written out, in sequence, by discarding 110951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * its high eight bits. The write starts at the current position of 111051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * the file pointer. 111151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 111251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param s a string of bytes to be written. 111351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 111451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 111551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeBytes(String s) throws IOException { 111651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int len = s.length(); 111751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski byte[] b = new byte[len]; 111851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski s.getBytes(0, len, b, 0); 111951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeBytes(b, 0, len); 112051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 112151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 112251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 112351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a string to the file as a sequence of characters. Each 112451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * character is written to the data output stream as if by the 112551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>writeChar</code> method. The write starts at the current 112651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * position of the file pointer. 112751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 112851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param s a <code>String</code> value to be written. 112951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 113051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see java.io.RandomAccessFile#writeChar(int) 113151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 113251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeChars(String s) throws IOException { 113351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int clen = s.length(); 113451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski int blen = 2*clen; 113551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski byte[] b = new byte[blen]; 113651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski char[] c = new char[clen]; 113751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski s.getChars(0, clen, c, 0); 113851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski for (int i = 0, j = 0; i < clen; i++) { 113951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski b[j++] = (byte)(c[i] >>> 8); 114051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski b[j++] = (byte)(c[i] >>> 0); 114151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 114251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski writeBytes(b, 0, blen); 114351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 114451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 114551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 114651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes a string to the file using 114751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <a href="DataInput.html#modified-utf-8">modified UTF-8</a> 114851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * encoding in a machine-independent manner. 114951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p> 115051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * First, two bytes are written to the file, starting at the 115151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * current file pointer, as if by the 115251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <code>writeShort</code> method giving the number of bytes to 115351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * follow. This value is the number of bytes actually written out, 115451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * not the length of the string. Following the length, each character 115551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * of the string is output, in sequence, using the modified UTF-8 encoding 115651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * for each character. 115751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 115851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param str a string to be written. 115951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception IOException if an I/O error occurs. 116051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 116151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public final void writeUTF(String str) throws IOException { 116251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski DataOutputStream.writeUTF(str, this); 116351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 116451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 11658d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski @Override protected void finalize() throws Throwable { 11668d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski try { 11678d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski if (guard != null) { 11688d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski guard.warnIfOpen(); 11698d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 11708d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski close(); 11718d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } finally { 11728d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski super.finalize(); 11738d05e88f57c1ea5543d4012687c70cd64efcada0Piotr Jastrzebski } 117451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 117551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski} 1176