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My first initial commit with all of mine experimental changes.

Dmitry Kabak (userdima committed 13 years ago

Commit d37b88d1 parent 3f5b46618352 files · +2598093 −-8690Browse files

Showing the changes to java/pkg/java/io/DataOutputStream.java (1 of 18352 files). Show all

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java/pkg/java/io/DataOutputStream.java+416−0
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1+/*
2+ * Copyright (c) 1994, 2004, Oracle and/or its affiliates. All rights reserved.
3+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4+ *
5+ * This code is free software; you can redistribute it and/or modify it
6+ * under the terms of the GNU General Public License version 2 only, as
7+ * published by the Free Software Foundation. Oracle designates this
8+ * particular file as subject to the "Classpath" exception as provided
9+ * by Oracle in the LICENSE file that accompanied this code.
10+ *
11+ * This code is distributed in the hope that it will be useful, but WITHOUT
12+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14+ * version 2 for more details (a copy is included in the LICENSE file that
15+ * accompanied this code).
16+ *
17+ * You should have received a copy of the GNU General Public License version
18+ * 2 along with this work; if not, write to the Free Software Foundation,
19+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20+ *
21+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22+ * or visit www.oracle.com if you need additional information or have any
23+ * questions.
24+ */
25+
26+package java.io;
27+
28+/**
29+ * A data output stream lets an application write primitive Java data
30+ * types to an output stream in a portable way. An application can
31+ * then use a data input stream to read the data back in.
32+ *
33+ * @author unascribed
34+ * @see java.io.DataInputStream
35+ * @since JDK1.0
36+ */
37+public
38+class DataOutputStream extends FilterOutputStream implements DataOutput {
39+ /**
40+ * The number of bytes written to the data output stream so far.
41+ * If this counter overflows, it will be wrapped to Integer.MAX_VALUE.
42+ */
43+ protected int written;
44+
45+ /**
46+ * bytearr is initialized on demand by writeUTF
47+ */
48+ private byte[] bytearr = null;
49+
50+ /**
51+ * Creates a new data output stream to write data to the specified
52+ * underlying output stream. The counter <code>written</code> is
53+ * set to zero.
54+ *
55+ * @param out the underlying output stream, to be saved for later
56+ * use.
57+ * @see java.io.FilterOutputStream#out
58+ */
59+ public DataOutputStream(OutputStream out) {
60+ super(out);
61+ }
62+
63+ /**
64+ * Increases the written counter by the specified value
65+ * until it reaches Integer.MAX_VALUE.
66+ */
67+ private void incCount(int value) {
68+ int temp = written + value;
69+ if (temp < 0) {
70+ temp = Integer.MAX_VALUE;
71+ }
72+ written = temp;
73+ }
74+
75+ /**
76+ * Writes the specified byte (the low eight bits of the argument
77+ * <code>b</code>) to the underlying output stream. If no exception
78+ * is thrown, the counter <code>written</code> is incremented by
79+ * <code>1</code>.
80+ * <p>
81+ * Implements the <code>write</code> method of <code>OutputStream</code>.
82+ *
83+ * @param b the <code>byte</code> to be written.
84+ * @exception IOException if an I/O error occurs.
85+ * @see java.io.FilterOutputStream#out
86+ */
87+ public synchronized void write(int b) throws IOException {
88+ out.write(b);
89+ incCount(1);
90+ }
91+
92+ /**
93+ * Writes <code>len</code> bytes from the specified byte array
94+ * starting at offset <code>off</code> to the underlying output stream.
95+ * If no exception is thrown, the counter <code>written</code> is
96+ * incremented by <code>len</code>.
97+ *
98+ * @param b the data.
99+ * @param off the start offset in the data.
100+ * @param len the number of bytes to write.
101+ * @exception IOException if an I/O error occurs.
102+ * @see java.io.FilterOutputStream#out
103+ */
104+ public synchronized void write(byte b[], int off, int len)
105+ throws IOException
106+ {
107+ out.write(b, off, len);
108+ incCount(len);
109+ }
110+
111+ /**
112+ * Flushes this data output stream. This forces any buffered output
113+ * bytes to be written out to the stream.
114+ * <p>
115+ * The <code>flush</code> method of <code>DataOutputStream</code>
116+ * calls the <code>flush</code> method of its underlying output stream.
117+ *
118+ * @exception IOException if an I/O error occurs.
119+ * @see java.io.FilterOutputStream#out
120+ * @see java.io.OutputStream#flush()
121+ */
122+ public void flush() throws IOException {
123+ out.flush();
124+ }
125+
126+ /**
127+ * Writes a <code>boolean</code> to the underlying output stream as
128+ * a 1-byte value. The value <code>true</code> is written out as the
129+ * value <code>(byte)1</code>; the value <code>false</code> is
130+ * written out as the value <code>(byte)0</code>. If no exception is
131+ * thrown, the counter <code>written</code> is incremented by
132+ * <code>1</code>.
133+ *
134+ * @param v a <code>boolean</code> value to be written.
135+ * @exception IOException if an I/O error occurs.
136+ * @see java.io.FilterOutputStream#out
137+ */
138+ public final void writeBoolean(boolean v) throws IOException {
139+ out.write(v ? 1 : 0);
140+ incCount(1);
141+ }
142+
143+ /**
144+ * Writes out a <code>byte</code> to the underlying output stream as
145+ * a 1-byte value. If no exception is thrown, the counter
146+ * <code>written</code> is incremented by <code>1</code>.
147+ *
148+ * @param v a <code>byte</code> value to be written.
149+ * @exception IOException if an I/O error occurs.
150+ * @see java.io.FilterOutputStream#out
151+ */
152+ public final void writeByte(int v) throws IOException {
153+ out.write(v);
154+ incCount(1);
155+ }
156+
157+ /**
158+ * Writes a <code>short</code> to the underlying output stream as two
159+ * bytes, high byte first. If no exception is thrown, the counter
160+ * <code>written</code> is incremented by <code>2</code>.
161+ *
162+ * @param v a <code>short</code> to be written.
163+ * @exception IOException if an I/O error occurs.
164+ * @see java.io.FilterOutputStream#out
165+ */
166+ public final void writeShort(int v) throws IOException {
167+ out.write((v >>> 8) & 0xFF);
168+ out.write((v >>> 0) & 0xFF);
169+ incCount(2);
170+ }
171+
172+ /**
173+ * Writes a <code>char</code> to the underlying output stream as a
174+ * 2-byte value, high byte first. If no exception is thrown, the
175+ * counter <code>written</code> is incremented by <code>2</code>.
176+ *
177+ * @param v a <code>char</code> value to be written.
178+ * @exception IOException if an I/O error occurs.
179+ * @see java.io.FilterOutputStream#out
180+ */
181+ public final void writeChar(int v) throws IOException {
182+ out.write((v >>> 8) & 0xFF);
183+ out.write((v >>> 0) & 0xFF);
184+ incCount(2);
185+ }
186+
187+ /**
188+ * Writes an <code>int</code> to the underlying output stream as four
189+ * bytes, high byte first. If no exception is thrown, the counter
190+ * <code>written</code> is incremented by <code>4</code>.
191+ *
192+ * @param v an <code>int</code> to be written.
193+ * @exception IOException if an I/O error occurs.
194+ * @see java.io.FilterOutputStream#out
195+ */
196+ public final void writeInt(int v) throws IOException {
197+ out.write((v >>> 24) & 0xFF);
198+ out.write((v >>> 16) & 0xFF);
199+ out.write((v >>> 8) & 0xFF);
200+ out.write((v >>> 0) & 0xFF);
201+ incCount(4);
202+ }
203+
204+ private byte writeBuffer[] = new byte[8];
205+
206+ /**
207+ * Writes a <code>long</code> to the underlying output stream as eight
208+ * bytes, high byte first. In no exception is thrown, the counter
209+ * <code>written</code> is incremented by <code>8</code>.
210+ *
211+ * @param v a <code>long</code> to be written.
212+ * @exception IOException if an I/O error occurs.
213+ * @see java.io.FilterOutputStream#out
214+ */
215+ public final void writeLong(long v) throws IOException {
216+ writeBuffer[0] = (byte)(v >>> 56);
217+ writeBuffer[1] = (byte)(v >>> 48);
218+ writeBuffer[2] = (byte)(v >>> 40);
219+ writeBuffer[3] = (byte)(v >>> 32);
220+ writeBuffer[4] = (byte)(v >>> 24);
221+ writeBuffer[5] = (byte)(v >>> 16);
222+ writeBuffer[6] = (byte)(v >>> 8);
223+ writeBuffer[7] = (byte)(v >>> 0);
224+ out.write(writeBuffer, 0, 8);
225+ incCount(8);
226+ }
227+
228+ /**
229+ * Converts the float argument to an <code>int</code> using the
230+ * <code>floatToIntBits</code> method in class <code>Float</code>,
231+ * and then writes that <code>int</code> value to the underlying
232+ * output stream as a 4-byte quantity, high byte first. If no
233+ * exception is thrown, the counter <code>written</code> is
234+ * incremented by <code>4</code>.
235+ *
236+ * @param v a <code>float</code> value to be written.
237+ * @exception IOException if an I/O error occurs.
238+ * @see java.io.FilterOutputStream#out
239+ * @see java.lang.Float#floatToIntBits(float)
240+ */
241+ public final void writeFloat(float v) throws IOException {
242+ writeInt(Float.floatToIntBits(v));
243+ }
244+
245+ /**
246+ * Converts the double argument to a <code>long</code> using the
247+ * <code>doubleToLongBits</code> method in class <code>Double</code>,
248+ * and then writes that <code>long</code> value to the underlying
249+ * output stream as an 8-byte quantity, high byte first. If no
250+ * exception is thrown, the counter <code>written</code> is
251+ * incremented by <code>8</code>.
252+ *
253+ * @param v a <code>double</code> value to be written.
254+ * @exception IOException if an I/O error occurs.
255+ * @see java.io.FilterOutputStream#out
256+ * @see java.lang.Double#doubleToLongBits(double)
257+ */
258+ public final void writeDouble(double v) throws IOException {
259+ writeLong(Double.doubleToLongBits(v));
260+ }
261+
262+ /**
263+ * Writes out the string to the underlying output stream as a
264+ * sequence of bytes. Each character in the string is written out, in
265+ * sequence, by discarding its high eight bits. If no exception is
266+ * thrown, the counter <code>written</code> is incremented by the
267+ * length of <code>s</code>.
268+ *
269+ * @param s a string of bytes to be written.
270+ * @exception IOException if an I/O error occurs.
271+ * @see java.io.FilterOutputStream#out
272+ */
273+ public final void writeBytes(String s) throws IOException {
274+ int len = s.length();
275+ for (int i = 0 ; i < len ; i++) {
276+ out.write((byte)s.charAt(i));
277+ }
278+ incCount(len);
279+ }
280+
281+ /**
282+ * Writes a string to the underlying output stream as a sequence of
283+ * characters. Each character is written to the data output stream as
284+ * if by the <code>writeChar</code> method. If no exception is
285+ * thrown, the counter <code>written</code> is incremented by twice
286+ * the length of <code>s</code>.
287+ *
288+ * @param s a <code>String</code> value to be written.
289+ * @exception IOException if an I/O error occurs.
290+ * @see java.io.DataOutputStream#writeChar(int)
291+ * @see java.io.FilterOutputStream#out
292+ */
293+ public final void writeChars(String s) throws IOException {
294+ int len = s.length();
295+ for (int i = 0 ; i < len ; i++) {
296+ int v = s.charAt(i);
297+ out.write((v >>> 8) & 0xFF);
298+ out.write((v >>> 0) & 0xFF);
299+ }
300+ incCount(len * 2);
301+ }
302+
303+ /**
304+ * Writes a string to the underlying output stream using
305+ * <a href="DataInput.html#modified-utf-8">modified UTF-8</a>
306+ * encoding in a machine-independent manner.
307+ * <p>
308+ * First, two bytes are written to the output stream as if by the
309+ * <code>writeShort</code> method giving the number of bytes to
310+ * follow. This value is the number of bytes actually written out,
311+ * not the length of the string. Following the length, each character
312+ * of the string is output, in sequence, using the modified UTF-8 encoding
313+ * for the character. If no exception is thrown, the counter
314+ * <code>written</code> is incremented by the total number of
315+ * bytes written to the output stream. This will be at least two
316+ * plus the length of <code>str</code>, and at most two plus
317+ * thrice the length of <code>str</code>.
318+ *
319+ * @param str a string to be written.
320+ * @exception IOException if an I/O error occurs.
321+ */
322+ public final void writeUTF(String str) throws IOException {
323+ writeUTF(str, this);
324+ }
325+
326+ /**
327+ * Writes a string to the specified DataOutput using
328+ * <a href="DataInput.html#modified-utf-8">modified UTF-8</a>
329+ * encoding in a machine-independent manner.
330+ * <p>
331+ * First, two bytes are written to out as if by the <code>writeShort</code>
332+ * method giving the number of bytes to follow. This value is the number of
333+ * bytes actually written out, not the length of the string. Following the
334+ * length, each character of the string is output, in sequence, using the
335+ * modified UTF-8 encoding for the character. If no exception is thrown, the
336+ * counter <code>written</code> is incremented by the total number of
337+ * bytes written to the output stream. This will be at least two
338+ * plus the length of <code>str</code>, and at most two plus
339+ * thrice the length of <code>str</code>.
340+ *
341+ * @param str a string to be written.
342+ * @param out destination to write to
343+ * @return The number of bytes written out.
344+ * @exception IOException if an I/O error occurs.
345+ */
346+ static int writeUTF(String str, DataOutput out) throws IOException {
347+ int strlen = str.length();
348+ int utflen = 0;
349+ int c, count = 0;
350+
351+ /* use charAt instead of copying String to char array */
352+ for (int i = 0; i < strlen; i++) {
353+ c = str.charAt(i);
354+ if ((c >= 0x0001) && (c <= 0x007F)) {
355+ utflen++;
356+ } else if (c > 0x07FF) {
357+ utflen += 3;
358+ } else {
359+ utflen += 2;
360+ }
361+ }
362+
363+ if (utflen > 65535)
364+ throw new UTFDataFormatException(
365+ "encoded string too long: " + utflen + " bytes");
366+
367+ byte[] bytearr = null;
368+ if (out instanceof DataOutputStream) {
369+ DataOutputStream dos = (DataOutputStream)out;
370+ if(dos.bytearr == null || (dos.bytearr.length < (utflen+2)))
371+ dos.bytearr = new byte[(utflen*2) + 2];
372+ bytearr = dos.bytearr;
373+ } else {
374+ bytearr = new byte[utflen+2];
375+ }
376+
377+ bytearr[count++] = (byte) ((utflen >>> 8) & 0xFF);
378+ bytearr[count++] = (byte) ((utflen >>> 0) & 0xFF);
379+
380+ int i=0;
381+ for (i=0; i<strlen; i++) {
382+ c = str.charAt(i);
383+ if (!((c >= 0x0001) && (c <= 0x007F))) break;
384+ bytearr[count++] = (byte) c;
385+ }
386+
387+ for (;i < strlen; i++){
388+ c = str.charAt(i);
389+ if ((c >= 0x0001) && (c <= 0x007F)) {
390+ bytearr[count++] = (byte) c;
391+
392+ } else if (c > 0x07FF) {
393+ bytearr[count++] = (byte) (0xE0 | ((c >> 12) & 0x0F));
394+ bytearr[count++] = (byte) (0x80 | ((c >> 6) & 0x3F));
395+ bytearr[count++] = (byte) (0x80 | ((c >> 0) & 0x3F));
396+ } else {
397+ bytearr[count++] = (byte) (0xC0 | ((c >> 6) & 0x1F));
398+ bytearr[count++] = (byte) (0x80 | ((c >> 0) & 0x3F));
399+ }
400+ }
401+ out.write(bytearr, 0, utflen+2);
402+ return utflen + 2;
403+ }
404+
405+ /**
406+ * Returns the current value of the counter <code>written</code>,
407+ * the number of bytes written to this data output stream so far.
408+ * If the counter overflows, it will be wrapped to Integer.MAX_VALUE.
409+ *
410+ * @return the value of the <code>written</code> field.
411+ * @see java.io.DataOutputStream#written
412+ */
413+ public final int size() {
414+ return written;
415+ }
416+}

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