| /* |
| * 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; |
| } |
| } |