content: /*
   * 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     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     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        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        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        FilterOutputStream#out
       * @see        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        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        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        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        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        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        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        FilterOutputStream#out
       * @see        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        FilterOutputStream#out
       * @see        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        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        DataOutputStream#writeChar(int)
       * @see        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     DataOutputStream#written
       */
      public final int size() {
          return written;
      }
  }
  