/*

  * Copyright (c) 1994, 2004, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the LICENSE file that accompanied this code.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  */

 package java.io;

 /**

  * A data output stream lets an application write primitive Java data

  * types to an output stream in a portable way. An application can

  * then use a data input stream to read the data back in.

  *

  * @author  unascribed

  * @see     java.io.DataInputStream

  * @since   JDK1.0

  */

 public

 class DataOutputStream extends FilterOutputStream implements DataOutput {

     /**

      * The number of bytes written to the data output stream so far.

      * If this counter overflows, it will be wrapped to Integer.MAX_VALUE.

      */

     protected int written;

     /**

      * bytearr is initialized on demand by writeUTF

      */

     private byte[] bytearr = null;

     /**

      * Creates a new data output stream to write data to the specified

      * underlying output stream. The counter <code>written</code> is

      * set to zero.

      *

      * @param   out   the underlying output stream, to be saved for later

      *                use.

      * @see     java.io.FilterOutputStream#out

      */

     public DataOutputStream(OutputStream out) {

         super(out);

     }

     /**

      * Increases the written counter by the specified value

      * until it reaches Integer.MAX_VALUE.

      */

     private void incCount(int value) {

         int temp = written + value;

         if (temp < 0) {

             temp = Integer.MAX_VALUE;

         }

         written = temp;

     }

     /**

      * Writes the specified byte (the low eight bits of the argument

      * <code>b</code>) to the underlying output stream. If no exception

      * is thrown, the counter <code>written</code> is incremented by

      * <code>1</code>.

      * <p>

      * Implements the <code>write</code> method of <code>OutputStream</code>.

      *

      * @param      b   the <code>byte</code> to be written.

      * @exception  IOException  if an I/O error occurs.

      * @see        java.io.FilterOutputStream#out

      */

     public synchronized void write(int b) throws IOException {

         out.write(b);

         incCount(1);

     }

     /**

      * Writes <code>len</code> bytes from the specified byte array

      * starting at offset <code>off</code> to the underlying output stream.

      * If no exception is thrown, the counter <code>written</code> is

      * incremented by <code>len</code>.

      *

      * @param      b     the data.

      * @param      off   the start offset in the data.

      * @param      len   the number of bytes to write.

      * @exception  IOException  if an I/O error occurs.

      * @see        java.io.FilterOutputStream#out

      */

     public synchronized void write(byte b[], int off, int len)

         throws IOException

     {

         out.write(b, off, len);

         incCount(len);

     }

     /**

      * Flushes this data output stream. This forces any buffered output

      * bytes to be written out to the stream.

      * <p>

      * The <code>flush</code> method of <code>DataOutputStream</code>

      * calls the <code>flush</code> method of its underlying output stream.

      *

      * @exception  IOException  if an I/O error occurs.

      * @see        java.io.FilterOutputStream#out

      * @see        java.io.OutputStream#flush()

      */

     public void flush() throws IOException {

         out.flush();

     }

     /**

      * Writes a <code>boolean</code> to the underlying output stream as

      * a 1-byte value. The value <code>true</code> is written out as the

      * value <code>(byte)1</code>; the value <code>false</code> is

      * written out as the value <code>(byte)0</code>. If no exception is

      * thrown, the counter <code>written</code> is incremented by

      * <code>1</code>.

      *

      * @param      v   a <code>boolean</code> value to be written.

      * @exception  IOException  if an I/O error occurs.

      * @see        java.io.FilterOutputStream#out

      */

     public final void writeBoolean(boolean v) throws IOException {

         out.write(v ? 1 : 0);

         incCount(1);

     }

     /**

      * Writes out a <code>byte</code> to the underlying output stream as

      * a 1-byte value. If no exception is thrown, the counter

      * <code>written</code> is incremented by <code>1</code>.

      *

      * @param      v   a <code>byte</code> value to be written.

      * @exception  IOException  if an I/O error occurs.

      * @see        java.io.FilterOutputStream#out

      */

     public final void writeByte(int v) throws IOException {

         out.write(v);

         incCount(1);

     }

     /**

      * Writes a <code>short</code> to the underlying output stream as two

      * bytes, high byte first. If no exception is thrown, the counter

      * <code>written</code> is incremented by <code>2</code>.

      *

      * @param      v   a <code>short</code> to be written.

      * @exception  IOException  if an I/O error occurs.

      * @see        java.io.FilterOutputStream#out

      */

     public final void writeShort(int v) throws IOException {

         out.write((v >>> 8) & 0xFF);

         out.write((v >>> 0) & 0xFF);

         incCount(2);

     }

     /**

      * Writes a <code>char</code> to the underlying output stream as a

      * 2-byte value, high byte first. If no exception is thrown, the

      * counter <code>written</code> is incremented by <code>2</code>.

      *

      * @param      v   a <code>char</code> value to be written.

      * @exception  IOException  if an I/O error occurs.

      * @see        java.io.FilterOutputStream#out

      */

     public final void writeChar(int v) throws IOException {

         out.write((v >>> 8) & 0xFF);

         out.write((v >>> 0) & 0xFF);

         incCount(2);

     }

     /**

      * Writes an <code>int</code> to the underlying output stream as four

      * bytes, high byte first. If no exception is thrown, the counter

      * <code>written</code> is incremented by <code>4</code>.

      *

      * @param      v   an <code>int</code> to be written.

      * @exception  IOException  if an I/O error occurs.

      * @see        java.io.FilterOutputStream#out

      */

     public final void writeInt(int v) throws IOException {

         out.write((v >>> 24) & 0xFF);

         out.write((v >>> 16) & 0xFF);

         out.write((v >>>  8) & 0xFF);

         out.write((v >>>  0) & 0xFF);

         incCount(4);

     }

     private byte writeBuffer[] = new byte[8];

     /**

      * Writes a <code>long</code> to the underlying output stream as eight

      * bytes, high byte first. In no exception is thrown, the counter

      * <code>written</code> is incremented by <code>8</code>.

      *

      * @param      v   a <code>long</code> to be written.

      * @exception  IOException  if an I/O error occurs.

      * @see        java.io.FilterOutputStream#out

      */

     public final void writeLong(long v) throws IOException {

         writeBuffer[0] = (byte)(v >>> 56);

         writeBuffer[1] = (byte)(v >>> 48);

         writeBuffer[2] = (byte)(v >>> 40);

         writeBuffer[3] = (byte)(v >>> 32);

         writeBuffer[4] = (byte)(v >>> 24);

         writeBuffer[5] = (byte)(v >>> 16);

         writeBuffer[6] = (byte)(v >>>  8);

         writeBuffer[7] = (byte)(v >>>  0);

         out.write(writeBuffer, 0, 8);

         incCount(8);

     }

     /**

      * Converts the float argument to an <code>int</code> using the

      * <code>floatToIntBits</code> method in class <code>Float</code>,

      * and then writes that <code>int</code> value to the underlying

      * output stream as a 4-byte quantity, high byte first. If no

      * exception is thrown, the counter <code>written</code> is

      * incremented by <code>4</code>.

      *

      * @param      v   a <code>float</code> value to be written.

      * @exception  IOException  if an I/O error occurs.

      * @see        java.io.FilterOutputStream#out

      * @see        java.lang.Float#floatToIntBits(float)

      */

     public final void writeFloat(float v) throws IOException {

         writeInt(Float.floatToIntBits(v));

     }

     /**

      * Converts the double argument to a <code>long</code> using the

      * <code>doubleToLongBits</code> method in class <code>Double</code>,

      * and then writes that <code>long</code> value to the underlying

      * output stream as an 8-byte quantity, high byte first. If no

      * exception is thrown, the counter <code>written</code> is

      * incremented by <code>8</code>.

      *

      * @param      v   a <code>double</code> value to be written.

      * @exception  IOException  if an I/O error occurs.

      * @see        java.io.FilterOutputStream#out

      * @see        java.lang.Double#doubleToLongBits(double)

      */

     public final void writeDouble(double v) throws IOException {

         writeLong(Double.doubleToLongBits(v));

     }

     /**

      * Writes out the string to the underlying output stream as a

      * sequence of bytes. Each character in the string is written out, in

      * sequence, by discarding its high eight bits. If no exception is

      * thrown, the counter <code>written</code> is incremented by the

      * length of <code>s</code>.

      *

      * @param      s   a string of bytes to be written.

      * @exception  IOException  if an I/O error occurs.

      * @see        java.io.FilterOutputStream#out

      */

     public final void writeBytes(String s) throws IOException {

         int len = s.length();

         for (int i = 0 ; i < len ; i++) {

             out.write((byte)s.charAt(i));

         }

         incCount(len);

     }

     /**

      * Writes a string to the underlying output stream as a sequence of

      * characters. Each character is written to the data output stream as

      * if by the <code>writeChar</code> method. If no exception is

      * thrown, the counter <code>written</code> is incremented by twice

      * the length of <code>s</code>.

      *

      * @param      s   a <code>String</code> value to be written.

      * @exception  IOException  if an I/O error occurs.

      * @see        java.io.DataOutputStream#writeChar(int)

      * @see        java.io.FilterOutputStream#out

      */

     public final void writeChars(String s) throws IOException {

         int len = s.length();

         for (int i = 0 ; i < len ; i++) {

             int v = s.charAt(i);

             out.write((v >>> 8) & 0xFF);

             out.write((v >>> 0) & 0xFF);

         }

         incCount(len * 2);

     }

     /**

      * Writes a string to the underlying output stream using

      * <a href="DataInput.html#modified-utf-8">modified UTF-8</a>

      * encoding in a machine-independent manner.

      * <p>

      * First, two bytes are written to the output stream as if by the

      * <code>writeShort</code> method giving the number of bytes to

      * follow. This value is the number of bytes actually written out,

      * not the length of the string. Following the length, each character

      * of the string is output, in sequence, using the modified UTF-8 encoding

      * for the character. If no exception is thrown, the counter

      * <code>written</code> is incremented by the total number of

      * bytes written to the output stream. This will be at least two

      * plus the length of <code>str</code>, and at most two plus

      * thrice the length of <code>str</code>.

      *

      * @param      str   a string to be written.

      * @exception  IOException  if an I/O error occurs.

      */

     public final void writeUTF(String str) throws IOException {

         writeUTF(str, this);

     }

     /**

      * Writes a string to the specified DataOutput using

      * <a href="DataInput.html#modified-utf-8">modified UTF-8</a>

      * encoding in a machine-independent manner.

      * <p>

      * First, two bytes are written to out as if by the <code>writeShort</code>

      * method giving the number of bytes to follow. This value is the number of

      * bytes actually written out, not the length of the string. Following the

      * length, each character of the string is output, in sequence, using the

      * modified UTF-8 encoding for the character. If no exception is thrown, the

      * counter <code>written</code> is incremented by the total number of

      * bytes written to the output stream. This will be at least two

      * plus the length of <code>str</code>, and at most two plus

      * thrice the length of <code>str</code>.

      *

      * @param      str   a string to be written.

      * @param      out   destination to write to

      * @return     The number of bytes written out.

      * @exception  IOException  if an I/O error occurs.

      */

     static int writeUTF(String str, DataOutput out) throws IOException {

         int strlen = str.length();

         int utflen = 0;

         int c, count = 0;

         /* use charAt instead of copying String to char array */

         for (int i = 0; i < strlen; i++) {

             c = str.charAt(i);

             if ((c >= 0x0001) && (c <= 0x007F)) {

                 utflen++;

             } else if (c > 0x07FF) {

                 utflen += 3;

             } else {

                 utflen += 2;

             }

         }

         if (utflen > 65535)

             throw new UTFDataFormatException(

                 "encoded string too long: " + utflen + " bytes");

         byte[] bytearr = null;

         if (out instanceof DataOutputStream) {

             DataOutputStream dos = (DataOutputStream)out;

             if(dos.bytearr == null || (dos.bytearr.length < (utflen+2)))

                 dos.bytearr = new byte[(utflen*2) + 2];

             bytearr = dos.bytearr;

         } else {

             bytearr = new byte[utflen+2];

         }

         bytearr[count++] = (byte) ((utflen >>> 8) & 0xFF);

         bytearr[count++] = (byte) ((utflen >>> 0) & 0xFF);

         int i=0;

         for (i=0; i<strlen; i++) {

            c = str.charAt(i);

            if (!((c >= 0x0001) && (c <= 0x007F))) break;

            bytearr[count++] = (byte) c;

         }

         for (;i < strlen; i++){

             c = str.charAt(i);

             if ((c >= 0x0001) && (c <= 0x007F)) {

                 bytearr[count++] = (byte) c;

             } else if (c > 0x07FF) {

                 bytearr[count++] = (byte) (0xE0 | ((c >> 12) & 0x0F));

                 bytearr[count++] = (byte) (0x80 | ((c >>  6) & 0x3F));

                 bytearr[count++] = (byte) (0x80 | ((c >>  0) & 0x3F));

             } else {

                 bytearr[count++] = (byte) (0xC0 | ((c >>  6) & 0x1F));

                 bytearr[count++] = (byte) (0x80 | ((c >>  0) & 0x3F));

             }

         }

         out.write(bytearr, 0, utflen+2);

         return utflen + 2;

     }

     /**

      * Returns the current value of the counter <code>written</code>,

      * the number of bytes written to this data output stream so far.

      * If the counter overflows, it will be wrapped to Integer.MAX_VALUE.

      *

      * @return  the value of the <code>written</code> field.

      * @see     java.io.DataOutputStream#written

      */

     public final int size() {

         return written;

     }

 }