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jlechner |
/* DataOutputStream.java -- Writes primitive Java datatypes to streams
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Copyright (C) 1998, 2001, 2003, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.io;
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/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
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* "The Java Language Specification", ISBN 0-201-63451-1
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* Status: Complete to version 1.1.
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*/
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/**
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* This class provides a mechanism for writing primitive Java datatypes
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* to an <code>OutputStream</code> in a portable way. Data written to
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* a stream using this class can be read back in using the
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* <code>DataInputStream</code> class on any platform.
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*
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* @see DataInputStream
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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* @author Tom Tromey (tromey@cygnus.com)
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*/
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public class DataOutputStream extends FilterOutputStream implements DataOutput
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{
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/**
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* This is the total number of bytes that have been written to the
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* stream by this object instance.
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*/
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protected int written;
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/**
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* This method initializes an instance of <code>DataOutputStream</code> to
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* write its data to the specified underlying <code>OutputStream</code>
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*
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* @param out The subordinate <code>OutputStream</code> to which this
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* object will write
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*/
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public DataOutputStream (OutputStream out)
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{
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super (out);
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written = 0;
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}
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/**
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* This method flushes any unwritten bytes to the underlying stream.
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*
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* @exception IOException If an error occurs.
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*/
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public void flush () throws IOException
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{
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out.flush();
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}
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/**
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* This method returns the total number of bytes that have been written to
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* the underlying output stream so far. This is the value of the
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* <code>written</code> instance variable
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*
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* @return The number of bytes written to the stream.
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*/
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public final int size ()
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{
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return written;
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}
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/**
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* This method writes the specified byte (passed as an <code>int</code>)
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* to the underlying output stream.
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*
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* @param value The <code>byte</code> to write, passed as an <code>int</code>.
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*
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* @exception IOException If an error occurs.
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*/
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public synchronized void write (int value) throws IOException
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{
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out.write (value);
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++written;
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}
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/**
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* This method writes <code>len</code> bytes from the specified byte array
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* <code>buf</code> starting at position <code>offset</code> into the
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* buffer to the underlying output stream.
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*
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* @param buf The byte array to write from.
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* @param offset The index into the byte array to start writing from.
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* @param len The number of bytes to write.
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*
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* @exception IOException If an error occurs.
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*/
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public synchronized void write (byte[] buf, int offset, int len)
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throws IOException
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{
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out.write(buf, offset, len);
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written += len;
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}
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/**
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* This method writes a Java boolean value to an output stream. If
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* <code>value</code> is <code>true</code>, a byte with the value of
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* 1 will be written, otherwise a byte with the value of 0 will be
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* written.
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*
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* The value written can be read using the <code>readBoolean</code>
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* method in <code>DataInput</code>.
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*
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* @param value The <code>boolean</code> value to write to the stream
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*
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* @exception IOException If an error occurs
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*
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* @see DataInput#readBoolean
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*/
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public final void writeBoolean (boolean value) throws IOException
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{
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write (value ? 1 : 0);
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}
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/**
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* This method writes a Java byte value to an output stream. The
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* byte to be written will be in the lowest 8 bits of the
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* <code>int</code> value passed.
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*
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* The value written can be read using the <code>readByte</code> or
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* <code>readUnsignedByte</code> methods in <code>DataInput</code>.
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*
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* @param value The <code>byte</code> to write to the stream, passed as
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* the low eight bits of an <code>int</code>.
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*
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* @exception IOException If an error occurs
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*
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* @see DataInput#readByte
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* @see DataInput#readUnsignedByte
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*/
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public final void writeByte (int value) throws IOException
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{
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write (value & 0xff);
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}
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/**
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* This method writes a Java short value to an output stream. The
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* char to be written will be in the lowest 16 bits of the <code>int</code>
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* value passed. These bytes will be written "big endian". That is,
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* with the high byte written first in the following manner:
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* <p>
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* <code>byte0 = (byte)((value & 0xFF00) >> 8);<br>
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* byte1 = (byte)(value & 0x00FF);</code>
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* <p>
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*
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* The value written can be read using the <code>readShort</code> and
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* <code>readUnsignedShort</code> methods in <code>DataInput</code>.
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*
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* @param value The <code>short</code> value to write to the stream,
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* passed as an <code>int</code>.
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*
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* @exception IOException If an error occurs
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*
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* @see DataInput#readShort
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* @see DataInput#readUnsignedShort
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*/
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public final synchronized void writeShort (int value) throws IOException
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{
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write ((byte) (0xff & (value >> 8)));
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write ((byte) (0xff & value));
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}
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/**
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* This method writes a Java char value to an output stream. The
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* char to be written will be in the lowest 16 bits of the <code>int</code>
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* value passed. These bytes will be written "big endian". That is,
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* with the high byte written first in the following manner:
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* <p>
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* <code>byte0 = (byte)((value & 0xFF00) >> 8);<br>
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* byte1 = (byte)(value & 0x00FF);</code>
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* <p>
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*
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* The value written can be read using the <code>readChar</code>
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* method in <code>DataInput</code>.
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*
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* @param value The <code>char</code> value to write,
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* passed as an <code>int</code>.
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*
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* @exception IOException If an error occurs
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*
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* @see DataInput#readChar
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*/
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public final synchronized void writeChar (int value) throws IOException
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{
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write ((byte) (0xff & (value >> 8)));
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write ((byte) (0xff & value));
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}
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/**
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* This method writes a Java int value to an output stream. The 4 bytes
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* of the passed value will be written "big endian". That is, with
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* the high byte written first in the following manner:
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* <p>
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* <code>byte0 = (byte)((value & 0xFF000000) >> 24);<br>
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* byte1 = (byte)((value & 0x00FF0000) >> 16);<br>
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* byte2 = (byte)((value & 0x0000FF00) >> 8);<br>
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* byte3 = (byte)(value & 0x000000FF);</code>
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* <p>
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*
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* The value written can be read using the <code>readInt</code>
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* method in <code>DataInput</code>.
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*
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* @param value The <code>int</code> value to write to the stream
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*
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* @exception IOException If an error occurs
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*
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* @see DataInput#readInt
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*/
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public final synchronized void writeInt (int value) throws IOException
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{
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write ((byte) (0xff & (value >> 24)));
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write ((byte) (0xff & (value >> 16)));
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write ((byte) (0xff & (value >> 8)));
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write ((byte) (0xff & value));
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}
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/**
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* This method writes a Java long value to an output stream. The 8 bytes
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* of the passed value will be written "big endian". That is, with
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* the high byte written first in the following manner:
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* <p>
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* <code>byte0 = (byte)((value & 0xFF00000000000000L) >> 56);<br>
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* byte1 = (byte)((value & 0x00FF000000000000L) >> 48);<br>
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* byte2 = (byte)((value & 0x0000FF0000000000L) >> 40);<br>
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* byte3 = (byte)((value & 0x000000FF00000000L) >> 32);<br>
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* byte4 = (byte)((value & 0x00000000FF000000L) >> 24);<br>
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* byte5 = (byte)((value & 0x0000000000FF0000L) >> 16);<br>
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* byte6 = (byte)((value & 0x000000000000FF00L) >> 8);<br>
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* byte7 = (byte)(value & 0x00000000000000FFL);</code>
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* <p>
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*
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* The value written can be read using the <code>readLong</code>
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* method in <code>DataInput</code>.
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*
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* @param value The <code>long</code> value to write to the stream
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*
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* @exception IOException If an error occurs
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*
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* @see DataInput#readLong
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*/
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public final synchronized void writeLong (long value) throws IOException
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{
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write ((byte) (0xff & (value >> 56)));
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write ((byte) (0xff & (value>> 48)));
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write ((byte) (0xff & (value>> 40)));
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write ((byte) (0xff & (value>> 32)));
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write ((byte) (0xff & (value>> 24)));
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write ((byte) (0xff & (value>> 16)));
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write ((byte) (0xff & (value>> 8)));
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write ((byte) (0xff & value));
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}
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/**
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* This method writes a Java <code>float</code> value to the stream. This
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* value is written by first calling the method
|
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|
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* <code>Float.floatToIntBits</code>
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|
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* to retrieve an <code>int</code> representing the floating point number,
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* then writing this <code>int</code> value to the stream exactly the same
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* as the <code>writeInt()</code> method does.
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|
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*
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|
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* The value written can be read using the <code>readFloat</code>
|
299 |
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|
* method in <code>DataInput</code>.
|
300 |
|
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*
|
301 |
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* @param value The <code>float</code> value to write to the stream
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|
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*
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* @exception IOException If an error occurs
|
304 |
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*
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* @see #writeInt(int)
|
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|
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* @see DataInput#readFloat
|
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* @see Float#floatToIntBits
|
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*/
|
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public final void writeFloat (float value) throws IOException
|
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{
|
311 |
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writeInt (Float.floatToIntBits (value));
|
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}
|
313 |
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|
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|
|
/**
|
315 |
|
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* This method writes a Java <code>double</code> value to the stream. This
|
316 |
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* value is written by first calling the method
|
317 |
|
|
* <code>Double.doubleToLongBits</code>
|
318 |
|
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* to retrieve an <code>long</code> representing the floating point number,
|
319 |
|
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* then writing this <code>long</code> value to the stream exactly the same
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* as the <code>writeLong()</code> method does.
|
321 |
|
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*
|
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* The value written can be read using the <code>readDouble</code>
|
323 |
|
|
* method in <code>DataInput</code>.
|
324 |
|
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*
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325 |
|
|
* @param value The <code>double</code> value to write to the stream
|
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*
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|
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* @exception IOException If an error occurs
|
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|
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*
|
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* @see #writeLong(long)
|
330 |
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* @see DataInput#readDouble
|
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|
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* @see Double#doubleToLongBits
|
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|
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*/
|
333 |
|
|
public final void writeDouble (double value) throws IOException
|
334 |
|
|
{
|
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writeLong (Double.doubleToLongBits (value));
|
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|
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}
|
337 |
|
|
|
338 |
|
|
/**
|
339 |
|
|
* This method writes all the bytes in a <code>String</code> out to the
|
340 |
|
|
* stream. One byte is written for each character in the
|
341 |
|
|
* <code>String</code>.
|
342 |
|
|
* The high eight bits of each character are discarded, thus this
|
343 |
|
|
* method is inappropriate for completely representing Unicode characters.
|
344 |
|
|
*
|
345 |
|
|
* @param value The <code>String</code> to write to the stream
|
346 |
|
|
*
|
347 |
|
|
* @exception IOException If an error occurs
|
348 |
|
|
*/
|
349 |
|
|
public final void writeBytes (String value) throws IOException
|
350 |
|
|
{
|
351 |
|
|
int len = value.length();
|
352 |
|
|
for (int i = 0; i < len; ++i)
|
353 |
|
|
writeByte (value.charAt(i));
|
354 |
|
|
}
|
355 |
|
|
|
356 |
|
|
/**
|
357 |
|
|
* This method writes all the characters of a <code>String</code> to an
|
358 |
|
|
* output stream as an array of <code>char</code>'s. Each character
|
359 |
|
|
* is written using the method specified in the <code>writeChar</code>
|
360 |
|
|
* method.
|
361 |
|
|
*
|
362 |
|
|
* @param value The <code>String</code> to write to the stream
|
363 |
|
|
*
|
364 |
|
|
* @exception IOException If an error occurs
|
365 |
|
|
*
|
366 |
|
|
* @see #writeChar(char)
|
367 |
|
|
*/
|
368 |
|
|
public final void writeChars (String value) throws IOException
|
369 |
|
|
{
|
370 |
|
|
int len = value.length();
|
371 |
|
|
for (int i = 0; i < len; ++i)
|
372 |
|
|
writeChar (value.charAt(i));
|
373 |
|
|
}
|
374 |
|
|
|
375 |
|
|
/**
|
376 |
|
|
* This method writes a Java <code>String</code> to the stream in a modified
|
377 |
|
|
* UTF-8 format. First, two bytes are written to the stream indicating the
|
378 |
|
|
* number of bytes to follow. Note that this is the number of bytes in the
|
379 |
|
|
* encoded <code>String</code> not the <code>String</code> length. Next
|
380 |
|
|
* come the encoded characters. Each character in the <code>String</code>
|
381 |
|
|
* is encoded as either one, two or three bytes. For characters in the
|
382 |
|
|
* range of <code>\u0001</code> to <\u007F>, one byte is used. The character
|
383 |
|
|
* value goes into bits 0-7 and bit eight is 0. For characters in the range
|
384 |
|
|
* of <code>\u0080</code> to <code>\u007FF</code>, two bytes are used. Bits
|
385 |
|
|
* 6-10 of the character value are encoded bits 0-4 of the first byte, with
|
386 |
|
|
* the high bytes having a value of "110". Bits 0-5 of the character value
|
387 |
|
|
* are stored in bits 0-5 of the second byte, with the high bits set to
|
388 |
|
|
* "10". This type of encoding is also done for the null character
|
389 |
|
|
* <code>\u0000</code>. This eliminates any C style NUL character values
|
390 |
|
|
* in the output. All remaining characters are stored as three bytes.
|
391 |
|
|
* Bits 12-15 of the character value are stored in bits 0-3 of the first
|
392 |
|
|
* byte. The high bits of the first bytes are set to "1110". Bits 6-11
|
393 |
|
|
* of the character value are stored in bits 0-5 of the second byte. The
|
394 |
|
|
* high bits of the second byte are set to "10". And bits 0-5 of the
|
395 |
|
|
* character value are stored in bits 0-5 of byte three, with the high bits
|
396 |
|
|
* of that byte set to "10".
|
397 |
|
|
*
|
398 |
|
|
* The value written can be read using the <code>readUTF</code>
|
399 |
|
|
* method in <code>DataInput</code>.
|
400 |
|
|
*
|
401 |
|
|
* @param value The <code>String</code> to write to the output in UTF format
|
402 |
|
|
*
|
403 |
|
|
* @exception IOException If an error occurs
|
404 |
|
|
*
|
405 |
|
|
* @see DataInput#readUTF
|
406 |
|
|
*/
|
407 |
|
|
public final synchronized void writeUTF(String value) throws IOException
|
408 |
|
|
{
|
409 |
|
|
int len = value.length();
|
410 |
|
|
int sum = 0;
|
411 |
|
|
|
412 |
|
|
for (int i = 0; i < len && sum <= 65535; ++i)
|
413 |
|
|
{
|
414 |
|
|
char c = value.charAt(i);
|
415 |
|
|
if (c >= '\u0001' && c <= '\u007f')
|
416 |
|
|
sum += 1;
|
417 |
|
|
else if (c == '\u0000' || (c >= '\u0080' && c <= '\u07ff'))
|
418 |
|
|
sum += 2;
|
419 |
|
|
else
|
420 |
|
|
sum += 3;
|
421 |
|
|
}
|
422 |
|
|
|
423 |
|
|
if (sum > 65535)
|
424 |
|
|
throw new UTFDataFormatException ();
|
425 |
|
|
|
426 |
|
|
int pos = 0;
|
427 |
|
|
byte[] buf = new byte[sum];
|
428 |
|
|
|
429 |
|
|
for (int i = 0; i < len; ++i)
|
430 |
|
|
{
|
431 |
|
|
char c = value.charAt(i);
|
432 |
|
|
if (c >= '\u0001' && c <= '\u007f')
|
433 |
|
|
buf[pos++] = (byte) c;
|
434 |
|
|
else if (c == '\u0000' || (c >= '\u0080' && c <= '\u07ff'))
|
435 |
|
|
{
|
436 |
|
|
buf[pos++] = (byte) (0xc0 | (0x1f & (c >> 6)));
|
437 |
|
|
buf[pos++] = (byte) (0x80 | (0x3f & c));
|
438 |
|
|
}
|
439 |
|
|
else
|
440 |
|
|
{
|
441 |
|
|
// JSL says the first byte should be or'd with 0xc0, but
|
442 |
|
|
// that is a typo. Unicode says 0xe0, and that is what is
|
443 |
|
|
// consistent with DataInputStream.
|
444 |
|
|
buf[pos++] = (byte) (0xe0 | (0x0f & (c >> 12)));
|
445 |
|
|
buf[pos++] = (byte) (0x80 | (0x3f & (c >> 6)));
|
446 |
|
|
buf[pos++] = (byte) (0x80 | (0x3f & c));
|
447 |
|
|
}
|
448 |
|
|
}
|
449 |
|
|
|
450 |
|
|
writeShort (sum);
|
451 |
|
|
write(buf, 0, sum);
|
452 |
|
|
}
|
453 |
|
|
|
454 |
|
|
} // class DataOutputStream
|
455 |
|
|
|