/*
 * Copyright (c) 1994, 2004, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
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 *
 *
 *
 *
 *
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 *
 *
 *
 */

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 1.0
 */
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;
 }
}