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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 | } | ||