417 lines
16 KiB
Java
417 lines
16 KiB
Java
/*
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* Copyright (c) 1994, 2004, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.io;
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/**
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* A data output stream lets an application write primitive Java data
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* types to an output stream in a portable way. An application can
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* then use a data input stream to read the data back in.
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*
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* @author unascribed
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* @see java.io.DataInputStream
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* @since 1.0
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*/
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public
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class DataOutputStream extends FilterOutputStream implements DataOutput {
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/**
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* The number of bytes written to the data output stream so far.
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* If this counter overflows, it will be wrapped to Integer.MAX_VALUE.
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*/
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protected int written;
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/**
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* bytearr is initialized on demand by writeUTF
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*/
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private byte[] bytearr = null;
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/**
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* Creates a new data output stream to write data to the specified
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* underlying output stream. The counter <code>written</code> is
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* set to zero.
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*
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* @param out the underlying output stream, to be saved for later
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* use.
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* @see java.io.FilterOutputStream#out
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*/
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public DataOutputStream(OutputStream out) {
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super(out);
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}
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/**
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* Increases the written counter by the specified value
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* until it reaches Integer.MAX_VALUE.
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*/
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private void incCount(int value) {
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int temp = written + value;
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if (temp < 0) {
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temp = Integer.MAX_VALUE;
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}
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written = temp;
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}
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/**
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* Writes the specified byte (the low eight bits of the argument
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* <code>b</code>) to the underlying output stream. If no exception
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* is thrown, the counter <code>written</code> is incremented by
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* <code>1</code>.
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* <p>
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* Implements the <code>write</code> method of <code>OutputStream</code>.
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*
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* @param b the <code>byte</code> to be written.
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* @exception IOException if an I/O error occurs.
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* @see java.io.FilterOutputStream#out
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*/
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public synchronized void write(int b) throws IOException {
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out.write(b);
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incCount(1);
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}
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/**
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* Writes <code>len</code> bytes from the specified byte array
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* starting at offset <code>off</code> to the underlying output stream.
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* If no exception is thrown, the counter <code>written</code> is
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* incremented by <code>len</code>.
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*
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* @param b the data.
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* @param off the start offset in the data.
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* @param len the number of bytes to write.
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* @exception IOException if an I/O error occurs.
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* @see java.io.FilterOutputStream#out
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*/
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public synchronized void write(byte b[], int off, int len)
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throws IOException
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{
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out.write(b, off, len);
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incCount(len);
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}
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/**
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* Flushes this data output stream. This forces any buffered output
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* bytes to be written out to the stream.
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* <p>
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* The <code>flush</code> method of <code>DataOutputStream</code>
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* calls the <code>flush</code> method of its underlying output stream.
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*
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* @exception IOException if an I/O error occurs.
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* @see java.io.FilterOutputStream#out
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* @see java.io.OutputStream#flush()
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*/
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public void flush() throws IOException {
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out.flush();
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}
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/**
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* Writes a <code>boolean</code> to the underlying output stream as
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* a 1-byte value. The value <code>true</code> is written out as the
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* value <code>(byte)1</code>; the value <code>false</code> is
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* written out as the value <code>(byte)0</code>. If no exception is
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* thrown, the counter <code>written</code> is incremented by
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* <code>1</code>.
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*
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* @param v a <code>boolean</code> value to be written.
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* @exception IOException if an I/O error occurs.
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* @see java.io.FilterOutputStream#out
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*/
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public final void writeBoolean(boolean v) throws IOException {
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out.write(v ? 1 : 0);
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incCount(1);
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}
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/**
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* Writes out a <code>byte</code> to the underlying output stream as
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* a 1-byte value. If no exception is thrown, the counter
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* <code>written</code> is incremented by <code>1</code>.
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*
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* @param v a <code>byte</code> value to be written.
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* @exception IOException if an I/O error occurs.
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* @see java.io.FilterOutputStream#out
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*/
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public final void writeByte(int v) throws IOException {
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out.write(v);
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incCount(1);
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}
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/**
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* Writes a <code>short</code> to the underlying output stream as two
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* bytes, high byte first. If no exception is thrown, the counter
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* <code>written</code> is incremented by <code>2</code>.
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*
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* @param v a <code>short</code> to be written.
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* @exception IOException if an I/O error occurs.
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* @see java.io.FilterOutputStream#out
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*/
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public final void writeShort(int v) throws IOException {
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out.write((v >>> 8) & 0xFF);
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out.write((v >>> 0) & 0xFF);
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incCount(2);
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}
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/**
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* Writes a <code>char</code> to the underlying output stream as a
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* 2-byte value, high byte first. If no exception is thrown, the
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* counter <code>written</code> is incremented by <code>2</code>.
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*
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* @param v a <code>char</code> value to be written.
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* @exception IOException if an I/O error occurs.
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* @see java.io.FilterOutputStream#out
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*/
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public final void writeChar(int v) throws IOException {
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out.write((v >>> 8) & 0xFF);
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out.write((v >>> 0) & 0xFF);
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incCount(2);
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}
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/**
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* Writes an <code>int</code> to the underlying output stream as four
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* bytes, high byte first. If no exception is thrown, the counter
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* <code>written</code> is incremented by <code>4</code>.
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*
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* @param v an <code>int</code> to be written.
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* @exception IOException if an I/O error occurs.
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* @see java.io.FilterOutputStream#out
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*/
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public final void writeInt(int v) throws IOException {
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out.write((v >>> 24) & 0xFF);
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out.write((v >>> 16) & 0xFF);
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out.write((v >>> 8) & 0xFF);
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out.write((v >>> 0) & 0xFF);
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incCount(4);
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}
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private byte writeBuffer[] = new byte[8];
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/**
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* Writes a <code>long</code> to the underlying output stream as eight
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* bytes, high byte first. In no exception is thrown, the counter
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* <code>written</code> is incremented by <code>8</code>.
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*
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* @param v a <code>long</code> to be written.
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* @exception IOException if an I/O error occurs.
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* @see java.io.FilterOutputStream#out
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*/
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public final void writeLong(long v) throws IOException {
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writeBuffer[0] = (byte)(v >>> 56);
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writeBuffer[1] = (byte)(v >>> 48);
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writeBuffer[2] = (byte)(v >>> 40);
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writeBuffer[3] = (byte)(v >>> 32);
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writeBuffer[4] = (byte)(v >>> 24);
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writeBuffer[5] = (byte)(v >>> 16);
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writeBuffer[6] = (byte)(v >>> 8);
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writeBuffer[7] = (byte)(v >>> 0);
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out.write(writeBuffer, 0, 8);
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incCount(8);
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}
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/**
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* Converts the float argument to an <code>int</code> using the
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* <code>floatToIntBits</code> method in class <code>Float</code>,
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* and then writes that <code>int</code> value to the underlying
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* output stream as a 4-byte quantity, high byte first. If no
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* exception is thrown, the counter <code>written</code> is
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* incremented by <code>4</code>.
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*
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* @param v a <code>float</code> value to be written.
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* @exception IOException if an I/O error occurs.
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* @see java.io.FilterOutputStream#out
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* @see java.lang.Float#floatToIntBits(float)
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*/
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public final void writeFloat(float v) throws IOException {
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writeInt(Float.floatToIntBits(v));
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}
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/**
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* Converts the double argument to a <code>long</code> using the
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* <code>doubleToLongBits</code> method in class <code>Double</code>,
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* and then writes that <code>long</code> value to the underlying
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* output stream as an 8-byte quantity, high byte first. If no
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* exception is thrown, the counter <code>written</code> is
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* incremented by <code>8</code>.
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*
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* @param v a <code>double</code> value to be written.
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* @exception IOException if an I/O error occurs.
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* @see java.io.FilterOutputStream#out
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* @see java.lang.Double#doubleToLongBits(double)
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*/
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public final void writeDouble(double v) throws IOException {
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writeLong(Double.doubleToLongBits(v));
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}
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/**
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* Writes out the string to the underlying output stream as a
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* sequence of bytes. Each character in the string is written out, in
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* sequence, by discarding its high eight bits. If no exception is
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* thrown, the counter <code>written</code> is incremented by the
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* length of <code>s</code>.
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*
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* @param s a string of bytes to be written.
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* @exception IOException if an I/O error occurs.
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* @see java.io.FilterOutputStream#out
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*/
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public final void writeBytes(String s) throws IOException {
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int len = s.length();
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for (int i = 0 ; i < len ; i++) {
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out.write((byte)s.charAt(i));
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}
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incCount(len);
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}
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/**
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* Writes a string to the underlying output stream as a sequence of
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* characters. Each character is written to the data output stream as
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* if by the <code>writeChar</code> method. If no exception is
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* thrown, the counter <code>written</code> is incremented by twice
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* the length of <code>s</code>.
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*
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* @param s a <code>String</code> value to be written.
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* @exception IOException if an I/O error occurs.
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* @see java.io.DataOutputStream#writeChar(int)
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* @see java.io.FilterOutputStream#out
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*/
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public final void writeChars(String s) throws IOException {
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int len = s.length();
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for (int i = 0 ; i < len ; i++) {
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int v = s.charAt(i);
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out.write((v >>> 8) & 0xFF);
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out.write((v >>> 0) & 0xFF);
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}
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incCount(len * 2);
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}
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/**
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* Writes a string to the underlying output stream using
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* <a href="DataInput.html#modified-utf-8">modified UTF-8</a>
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* encoding in a machine-independent manner.
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* <p>
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* First, two bytes are written to the output stream as if by the
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* <code>writeShort</code> method giving the number of bytes to
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* follow. This value is the number of bytes actually written out,
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* not the length of the string. Following the length, each character
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* of the string is output, in sequence, using the modified UTF-8 encoding
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* for the character. If no exception is thrown, the counter
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* <code>written</code> is incremented by the total number of
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* bytes written to the output stream. This will be at least two
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* plus the length of <code>str</code>, and at most two plus
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* thrice the length of <code>str</code>.
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*
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* @param str a string to be written.
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* @exception IOException if an I/O error occurs.
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*/
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public final void writeUTF(String str) throws IOException {
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writeUTF(str, this);
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}
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/**
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* Writes a string to the specified DataOutput using
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* <a href="DataInput.html#modified-utf-8">modified UTF-8</a>
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* encoding in a machine-independent manner.
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* <p>
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* First, two bytes are written to out as if by the <code>writeShort</code>
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* method giving the number of bytes to follow. This value is the number of
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* bytes actually written out, not the length of the string. Following the
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* length, each character of the string is output, in sequence, using the
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* modified UTF-8 encoding for the character. If no exception is thrown, the
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* counter <code>written</code> is incremented by the total number of
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* bytes written to the output stream. This will be at least two
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* plus the length of <code>str</code>, and at most two plus
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* thrice the length of <code>str</code>.
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*
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* @param str a string to be written.
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* @param out destination to write to
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* @return The number of bytes written out.
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* @exception IOException if an I/O error occurs.
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*/
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static int writeUTF(String str, DataOutput out) throws IOException {
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int strlen = str.length();
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int utflen = 0;
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int c, count = 0;
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/* use charAt instead of copying String to char array */
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for (int i = 0; i < strlen; i++) {
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c = str.charAt(i);
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if ((c >= 0x0001) && (c <= 0x007F)) {
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utflen++;
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} else if (c > 0x07FF) {
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utflen += 3;
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} else {
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utflen += 2;
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}
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}
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if (utflen > 65535)
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throw new UTFDataFormatException(
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"encoded string too long: " + utflen + " bytes");
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byte[] bytearr = null;
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if (out instanceof DataOutputStream) {
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DataOutputStream dos = (DataOutputStream)out;
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if(dos.bytearr == null || (dos.bytearr.length < (utflen+2)))
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dos.bytearr = new byte[(utflen*2) + 2];
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bytearr = dos.bytearr;
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} else {
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bytearr = new byte[utflen+2];
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}
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bytearr[count++] = (byte) ((utflen >>> 8) & 0xFF);
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bytearr[count++] = (byte) ((utflen >>> 0) & 0xFF);
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int i=0;
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for (i=0; i<strlen; i++) {
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c = str.charAt(i);
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if (!((c >= 0x0001) && (c <= 0x007F))) break;
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bytearr[count++] = (byte) c;
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}
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for (;i < strlen; i++){
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c = str.charAt(i);
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if ((c >= 0x0001) && (c <= 0x007F)) {
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bytearr[count++] = (byte) c;
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} else if (c > 0x07FF) {
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bytearr[count++] = (byte) (0xE0 | ((c >> 12) & 0x0F));
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bytearr[count++] = (byte) (0x80 | ((c >> 6) & 0x3F));
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bytearr[count++] = (byte) (0x80 | ((c >> 0) & 0x3F));
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} else {
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bytearr[count++] = (byte) (0xC0 | ((c >> 6) & 0x1F));
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bytearr[count++] = (byte) (0x80 | ((c >> 0) & 0x3F));
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}
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}
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out.write(bytearr, 0, utflen+2);
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return utflen + 2;
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}
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/**
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* Returns the current value of the counter <code>written</code>,
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* the number of bytes written to this data output stream so far.
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* If the counter overflows, it will be wrapped to Integer.MAX_VALUE.
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*
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* @return the value of the <code>written</code> field.
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* @see java.io.DataOutputStream#written
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*/
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public final int size() {
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return written;
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}
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}
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