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| 1 | /* | ||
| 2 | * Copyright (c) 1996, 2010, 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.util.zip; | ||
| 27 | |||
| 28 | /** | ||
| 29 | * This class provides support for general purpose compression using the | ||
| 30 | * popular ZLIB compression library. The ZLIB compression library was | ||
| 31 | * initially developed as part of the PNG graphics standard and is not | ||
| 32 | * protected by patents. It is fully described in the specifications at | ||
| 33 | * the <a href="package-summary.html#package_description">java.util.zip | ||
| 34 | * package description</a>. | ||
| 35 | * | ||
| 36 | * <p>The following code fragment demonstrates a trivial compression | ||
| 37 | * and decompression of a string using <tt>Deflater</tt> and | ||
| 38 | * <tt>Inflater</tt>. | ||
| 39 | * | ||
| 40 | * <blockquote><pre> | ||
| 41 | * try { | ||
| 42 | * // Encode a String into bytes | ||
| 43 | * String inputString = "blahblahblah"; | ||
| 44 | * byte[] input = inputString.getBytes("UTF-8"); | ||
| 45 | * | ||
| 46 | * // Compress the bytes | ||
| 47 | * byte[] output = new byte[100]; | ||
| 48 | * Deflater compresser = new Deflater(); | ||
| 49 | * compresser.setInput(input); | ||
| 50 | * compresser.finish(); | ||
| 51 | * int compressedDataLength = compresser.deflate(output); | ||
| 52 | * compresser.end(); | ||
| 53 | * | ||
| 54 | * // Decompress the bytes | ||
| 55 | * Inflater decompresser = new Inflater(); | ||
| 56 | * decompresser.setInput(output, 0, compressedDataLength); | ||
| 57 | * byte[] result = new byte[100]; | ||
| 58 | * int resultLength = decompresser.inflate(result); | ||
| 59 | * decompresser.end(); | ||
| 60 | * | ||
| 61 | * // Decode the bytes into a String | ||
| 62 | * String outputString = new String(result, 0, resultLength, "UTF-8"); | ||
| 63 | * } catch(java.io.UnsupportedEncodingException ex) { | ||
| 64 | * // handle | ||
| 65 | * } catch (java.util.zip.DataFormatException ex) { | ||
| 66 | * // handle | ||
| 67 | * } | ||
| 68 | * </pre></blockquote> | ||
| 69 | * | ||
| 70 | * @see Inflater | ||
| 71 | * @author David Connelly | ||
| 72 | */ | ||
| 73 | public | ||
| 74 | class Deflater { | ||
| 75 | |||
| 76 | private final ZStreamRef zsRef; | ||
| 77 | private byte[] buf = new byte[0]; | ||
| 78 | private int off, len; | ||
| 79 | private int level, strategy; | ||
| 80 | private boolean setParams; | ||
| 81 | private boolean finish, finished; | ||
| 82 | |||
| 83 | /** | ||
| 84 | * Compression method for the deflate algorithm (the only one currently | ||
| 85 | * supported). | ||
| 86 | */ | ||
| 87 | public static final int DEFLATED = 8; | ||
| 88 | |||
| 89 | /** | ||
| 90 | * Compression level for no compression. | ||
| 91 | */ | ||
| 92 | public static final int NO_COMPRESSION = 0; | ||
| 93 | |||
| 94 | /** | ||
| 95 | * Compression level for fastest compression. | ||
| 96 | */ | ||
| 97 | public static final int BEST_SPEED = 1; | ||
| 98 | |||
| 99 | /** | ||
| 100 | * Compression level for best compression. | ||
| 101 | */ | ||
| 102 | public static final int BEST_COMPRESSION = 9; | ||
| 103 | |||
| 104 | /** | ||
| 105 | * Default compression level. | ||
| 106 | */ | ||
| 107 | public static final int DEFAULT_COMPRESSION = -1; | ||
| 108 | |||
| 109 | /** | ||
| 110 | * Compression strategy best used for data consisting mostly of small | ||
| 111 | * values with a somewhat random distribution. Forces more Huffman coding | ||
| 112 | * and less string matching. | ||
| 113 | */ | ||
| 114 | public static final int FILTERED = 1; | ||
| 115 | |||
| 116 | /** | ||
| 117 | * Compression strategy for Huffman coding only. | ||
| 118 | */ | ||
| 119 | public static final int HUFFMAN_ONLY = 2; | ||
| 120 | |||
| 121 | /** | ||
| 122 | * Default compression strategy. | ||
| 123 | */ | ||
| 124 | public static final int DEFAULT_STRATEGY = 0; | ||
| 125 | |||
| 126 | /** | ||
| 127 | * Compression flush mode used to achieve best compression result. | ||
| 128 | * | ||
| 129 | * @see Deflater#deflate(byte[], int, int, int) | ||
| 130 | * @since 1.7 | ||
| 131 | */ | ||
| 132 | public static final int NO_FLUSH = 0; | ||
| 133 | |||
| 134 | /** | ||
| 135 | * Compression flush mode used to flush out all pending output; may | ||
| 136 | * degrade compression for some compression algorithms. | ||
| 137 | * | ||
| 138 | * @see Deflater#deflate(byte[], int, int, int) | ||
| 139 | * @since 1.7 | ||
| 140 | */ | ||
| 141 | public static final int SYNC_FLUSH = 2; | ||
| 142 | |||
| 143 | /** | ||
| 144 | * Compression flush mode used to flush out all pending output and | ||
| 145 | * reset the deflater. Using this mode too often can seriously degrade | ||
| 146 | * compression. | ||
| 147 | * | ||
| 148 | * @see Deflater#deflate(byte[], int, int, int) | ||
| 149 | * @since 1.7 | ||
| 150 | */ | ||
| 151 | public static final int FULL_FLUSH = 3; | ||
| 152 | |||
| 153 | static { | ||
| 154 | /* Zip library is loaded from System.initializeSystemClass */ | ||
| 155 | initIDs(); | ||
| 156 | } | ||
| 157 | |||
| 158 | /** | ||
| 159 | * Creates a new compressor using the specified compression level. | ||
| 160 | * If 'nowrap' is true then the ZLIB header and checksum fields will | ||
| 161 | * not be used in order to support the compression format used in | ||
| 162 | * both GZIP and PKZIP. | ||
| 163 | * @param level the compression level (0-9) | ||
| 164 | * @param nowrap if true then use GZIP compatible compression | ||
| 165 | */ | ||
| 166 | public Deflater(int level, boolean nowrap) { | ||
| 167 | this.level = level; | ||
| 168 | this.strategy = DEFAULT_STRATEGY; | ||
| 169 | this.zsRef = new ZStreamRef(init(level, DEFAULT_STRATEGY, nowrap)); | ||
| 170 | } | ||
| 171 | |||
| 172 | /** | ||
| 173 | * Creates a new compressor using the specified compression level. | ||
| 174 | * Compressed data will be generated in ZLIB format. | ||
| 175 | * @param level the compression level (0-9) | ||
| 176 | */ | ||
| 177 | public Deflater(int level) { | ||
| 178 | this(level, false); | ||
| 179 | } | ||
| 180 | |||
| 181 | /** | ||
| 182 | * Creates a new compressor with the default compression level. | ||
| 183 | * Compressed data will be generated in ZLIB format. | ||
| 184 | */ | ||
| 185 | public Deflater() { | ||
| 186 | this(DEFAULT_COMPRESSION, false); | ||
| 187 | } | ||
| 188 | |||
| 189 | /** | ||
| 190 | * Sets input data for compression. This should be called whenever | ||
| 191 | * needsInput() returns true indicating that more input data is required. | ||
| 192 | * @param b the input data bytes | ||
| 193 | * @param off the start offset of the data | ||
| 194 | * @param len the length of the data | ||
| 195 | * @see Deflater#needsInput | ||
| 196 | */ | ||
| 197 | public void setInput(byte[] b, int off, int len) { | ||
| 198 | if (b== null) { | ||
| 199 | throw new NullPointerException(); | ||
| 200 | } | ||
| 201 | if (off < 0 || len < 0 || off > b.length - len) { | ||
| 202 | throw new ArrayIndexOutOfBoundsException(); | ||
| 203 | } | ||
| 204 | synchronized (zsRef) { | ||
| 205 | this.buf = b; | ||
| 206 | this.off = off; | ||
| 207 | this.len = len; | ||
| 208 | } | ||
| 209 | } | ||
| 210 | |||
| 211 | /** | ||
| 212 | * Sets input data for compression. This should be called whenever | ||
| 213 | * needsInput() returns true indicating that more input data is required. | ||
| 214 | * @param b the input data bytes | ||
| 215 | * @see Deflater#needsInput | ||
| 216 | */ | ||
| 217 | public void setInput(byte[] b) { | ||
| 218 | setInput(b, 0, b.length); | ||
| 219 | } | ||
| 220 | |||
| 221 | /** | ||
| 222 | * Sets preset dictionary for compression. A preset dictionary is used | ||
| 223 | * when the history buffer can be predetermined. When the data is later | ||
| 224 | * uncompressed with Inflater.inflate(), Inflater.getAdler() can be called | ||
| 225 | * in order to get the Adler-32 value of the dictionary required for | ||
| 226 | * decompression. | ||
| 227 | * @param b the dictionary data bytes | ||
| 228 | * @param off the start offset of the data | ||
| 229 | * @param len the length of the data | ||
| 230 | * @see Inflater#inflate | ||
| 231 | * @see Inflater#getAdler | ||
| 232 | */ | ||
| 233 | public void setDictionary(byte[] b, int off, int len) { | ||
| 234 | if (b == null) { | ||
| 235 | throw new NullPointerException(); | ||
| 236 | } | ||
| 237 | if (off < 0 || len < 0 || off > b.length - len) { | ||
| 238 | throw new ArrayIndexOutOfBoundsException(); | ||
| 239 | } | ||
| 240 | synchronized (zsRef) { | ||
| 241 | ensureOpen(); | ||
| 242 | setDictionary(zsRef.address(), b, off, len); | ||
| 243 | } | ||
| 244 | } | ||
| 245 | |||
| 246 | /** | ||
| 247 | * Sets preset dictionary for compression. A preset dictionary is used | ||
| 248 | * when the history buffer can be predetermined. When the data is later | ||
| 249 | * uncompressed with Inflater.inflate(), Inflater.getAdler() can be called | ||
| 250 | * in order to get the Adler-32 value of the dictionary required for | ||
| 251 | * decompression. | ||
| 252 | * @param b the dictionary data bytes | ||
| 253 | * @see Inflater#inflate | ||
| 254 | * @see Inflater#getAdler | ||
| 255 | */ | ||
| 256 | public void setDictionary(byte[] b) { | ||
| 257 | setDictionary(b, 0, b.length); | ||
| 258 | } | ||
| 259 | |||
| 260 | /** | ||
| 261 | * Sets the compression strategy to the specified value. | ||
| 262 | * @param strategy the new compression strategy | ||
| 263 | * @exception IllegalArgumentException if the compression strategy is | ||
| 264 | * invalid | ||
| 265 | */ | ||
| 266 | public void setStrategy(int strategy) { | ||
| 267 | switch (strategy) { | ||
| 268 | case DEFAULT_STRATEGY: | ||
| 269 | case FILTERED: | ||
| 270 | case HUFFMAN_ONLY: | ||
| 271 | break; | ||
| 272 | default: | ||
| 273 | throw new IllegalArgumentException(); | ||
| 274 | } | ||
| 275 | synchronized (zsRef) { | ||
| 276 | if (this.strategy != strategy) { | ||
| 277 | this.strategy = strategy; | ||
| 278 | setParams = true; | ||
| 279 | } | ||
| 280 | } | ||
| 281 | } | ||
| 282 | |||
| 283 | /** | ||
| 284 | * Sets the current compression level to the specified value. | ||
| 285 | * @param level the new compression level (0-9) | ||
| 286 | * @exception IllegalArgumentException if the compression level is invalid | ||
| 287 | */ | ||
| 288 | public void setLevel(int level) { | ||
| 289 | if ((level < 0 || level > 9) && level != DEFAULT_COMPRESSION) { | ||
| 290 | throw new IllegalArgumentException("invalid compression level"); | ||
| 291 | } | ||
| 292 | synchronized (zsRef) { | ||
| 293 | if (this.level != level) { | ||
| 294 | this.level = level; | ||
| 295 | setParams = true; | ||
| 296 | } | ||
| 297 | } | ||
| 298 | } | ||
| 299 | |||
| 300 | /** | ||
| 301 | * Returns true if the input data buffer is empty and setInput() | ||
| 302 | * should be called in order to provide more input. | ||
| 303 | * @return true if the input data buffer is empty and setInput() | ||
| 304 | * should be called in order to provide more input | ||
| 305 | */ | ||
| 306 | public boolean needsInput() { | ||
| 307 | return len <= 0; | ||
| 308 | } | ||
| 309 | |||
| 310 | /** | ||
| 311 | * When called, indicates that compression should end with the current | ||
| 312 | * contents of the input buffer. | ||
| 313 | */ | ||
| 314 | public void finish() { | ||
| 315 | synchronized (zsRef) { | ||
| 316 | finish = true; | ||
| 317 | } | ||
| 318 | } | ||
| 319 | |||
| 320 | /** | ||
| 321 | * Returns true if the end of the compressed data output stream has | ||
| 322 | * been reached. | ||
| 323 | * @return true if the end of the compressed data output stream has | ||
| 324 | * been reached | ||
| 325 | */ | ||
| 326 | public boolean finished() { | ||
| 327 | synchronized (zsRef) { | ||
| 328 | return finished; | ||
| 329 | } | ||
| 330 | } | ||
| 331 | |||
| 332 | /** | ||
| 333 | * Compresses the input data and fills specified buffer with compressed | ||
| 334 | * data. Returns actual number of bytes of compressed data. A return value | ||
| 335 | * of 0 indicates that {@link #needsInput() needsInput} should be called | ||
| 336 | * in order to determine if more input data is required. | ||
| 337 | * | ||
| 338 | * <p>This method uses {@link #NO_FLUSH} as its compression flush mode. | ||
| 339 | * An invocation of this method of the form {@code deflater.deflate(b, off, len)} | ||
| 340 | * yields the same result as the invocation of | ||
| 341 | * {@code deflater.deflate(b, off, len, Deflater.NO_FLUSH)}. | ||
| 342 | * | ||
| 343 | * @param b the buffer for the compressed data | ||
| 344 | * @param off the start offset of the data | ||
| 345 | * @param len the maximum number of bytes of compressed data | ||
| 346 | * @return the actual number of bytes of compressed data written to the | ||
| 347 | * output buffer | ||
| 348 | */ | ||
| 349 | public int deflate(byte[] b, int off, int len) { | ||
| 350 | return deflate(b, off, len, NO_FLUSH); | ||
| 351 | } | ||
| 352 | |||
| 353 | /** | ||
| 354 | * Compresses the input data and fills specified buffer with compressed | ||
| 355 | * data. Returns actual number of bytes of compressed data. A return value | ||
| 356 | * of 0 indicates that {@link #needsInput() needsInput} should be called | ||
| 357 | * in order to determine if more input data is required. | ||
| 358 | * | ||
| 359 | * <p>This method uses {@link #NO_FLUSH} as its compression flush mode. | ||
| 360 | * An invocation of this method of the form {@code deflater.deflate(b)} | ||
| 361 | * yields the same result as the invocation of | ||
| 362 | * {@code deflater.deflate(b, 0, b.length, Deflater.NO_FLUSH)}. | ||
| 363 | * | ||
| 364 | * @param b the buffer for the compressed data | ||
| 365 | * @return the actual number of bytes of compressed data written to the | ||
| 366 | * output buffer | ||
| 367 | */ | ||
| 368 | public int deflate(byte[] b) { | ||
| 369 | return deflate(b, 0, b.length, NO_FLUSH); | ||
| 370 | } | ||
| 371 | |||
| 372 | /** | ||
| 373 | * Compresses the input data and fills the specified buffer with compressed | ||
| 374 | * data. Returns actual number of bytes of data compressed. | ||
| 375 | * | ||
| 376 | * <p>Compression flush mode is one of the following three modes: | ||
| 377 | * | ||
| 378 | * <ul> | ||
| 379 | * <li>{@link #NO_FLUSH}: allows the deflater to decide how much data | ||
| 380 | * to accumulate, before producing output, in order to achieve the best | ||
| 381 | * compression (should be used in normal use scenario). A return value | ||
| 382 | * of 0 in this flush mode indicates that {@link #needsInput()} should | ||
| 383 | * be called in order to determine if more input data is required. | ||
| 384 | * | ||
| 385 | * <li>{@link #SYNC_FLUSH}: all pending output in the deflater is flushed, | ||
| 386 | * to the specified output buffer, so that an inflater that works on | ||
| 387 | * compressed data can get all input data available so far (In particular | ||
| 388 | * the {@link #needsInput()} returns {@code true} after this invocation | ||
| 389 | * if enough output space is provided). Flushing with {@link #SYNC_FLUSH} | ||
| 390 | * may degrade compression for some compression algorithms and so it | ||
| 391 | * should be used only when necessary. | ||
| 392 | * | ||
| 393 | * <li>{@link #FULL_FLUSH}: all pending output is flushed out as with | ||
| 394 | * {@link #SYNC_FLUSH}. The compression state is reset so that the inflater | ||
| 395 | * that works on the compressed output data can restart from this point | ||
| 396 | * if previous compressed data has been damaged or if random access is | ||
| 397 | * desired. Using {@link #FULL_FLUSH} too often can seriously degrade | ||
| 398 | * compression. | ||
| 399 | * </ul> | ||
| 400 | * | ||
| 401 | * <p>In the case of {@link #FULL_FLUSH} or {@link #SYNC_FLUSH}, if | ||
| 402 | * the return value is {@code len}, the space available in output | ||
| 403 | * buffer {@code b}, this method should be invoked again with the same | ||
| 404 | * {@code flush} parameter and more output space. | ||
| 405 | * | ||
| 406 | * @param b the buffer for the compressed data | ||
| 407 | * @param off the start offset of the data | ||
| 408 | * @param len the maximum number of bytes of compressed data | ||
| 409 | * @param flush the compression flush mode | ||
| 410 | * @return the actual number of bytes of compressed data written to | ||
| 411 | * the output buffer | ||
| 412 | * | ||
| 413 | * @throws IllegalArgumentException if the flush mode is invalid | ||
| 414 | * @since 1.7 | ||
| 415 | */ | ||
| 416 | public int deflate(byte[] b, int off, int len, int flush) { | ||
| 417 | if (b == null) { | ||
| 418 | throw new NullPointerException(); | ||
| 419 | } | ||
| 420 | if (off < 0 || len < 0 || off > b.length - len) { | ||
| 421 | throw new ArrayIndexOutOfBoundsException(); | ||
| 422 | } | ||
| 423 | synchronized (zsRef) { | ||
| 424 | ensureOpen(); | ||
| 425 | if (flush == NO_FLUSH || flush == SYNC_FLUSH || | ||
| 426 | flush == FULL_FLUSH) | ||
| 427 | return deflateBytes(zsRef.address(), b, off, len, flush); | ||
| 428 | throw new IllegalArgumentException(); | ||
| 429 | } | ||
| 430 | } | ||
| 431 | |||
| 432 | /** | ||
| 433 | * Returns the ADLER-32 value of the uncompressed data. | ||
| 434 | * @return the ADLER-32 value of the uncompressed data | ||
| 435 | */ | ||
| 436 | public int getAdler() { | ||
| 437 | synchronized (zsRef) { | ||
| 438 | ensureOpen(); | ||
| 439 | return getAdler(zsRef.address()); | ||
| 440 | } | ||
| 441 | } | ||
| 442 | |||
| 443 | /** | ||
| 444 | * Returns the total number of uncompressed bytes input so far. | ||
| 445 | * | ||
| 446 | * <p>Since the number of bytes may be greater than | ||
| 447 | * Integer.MAX_VALUE, the {@link #getBytesRead()} method is now | ||
| 448 | * the preferred means of obtaining this information.</p> | ||
| 449 | * | ||
| 450 | * @return the total number of uncompressed bytes input so far | ||
| 451 | */ | ||
| 452 | public int getTotalIn() { | ||
| 453 | return (int) getBytesRead(); | ||
| 454 | } | ||
| 455 | |||
| 456 | /** | ||
| 457 | * Returns the total number of uncompressed bytes input so far.</p> | ||
| 458 | * | ||
| 459 | * @return the total (non-negative) number of uncompressed bytes input so far | ||
| 460 | * @since 1.5 | ||
| 461 | */ | ||
| 462 | public long getBytesRead() { | ||
| 463 | synchronized (zsRef) { | ||
| 464 | ensureOpen(); | ||
| 465 | return getBytesRead(zsRef.address()); | ||
| 466 | } | ||
| 467 | } | ||
| 468 | |||
| 469 | /** | ||
| 470 | * Returns the total number of compressed bytes output so far. | ||
| 471 | * | ||
| 472 | * <p>Since the number of bytes may be greater than | ||
| 473 | * Integer.MAX_VALUE, the {@link #getBytesWritten()} method is now | ||
| 474 | * the preferred means of obtaining this information.</p> | ||
| 475 | * | ||
| 476 | * @return the total number of compressed bytes output so far | ||
| 477 | */ | ||
| 478 | public int getTotalOut() { | ||
| 479 | return (int) getBytesWritten(); | ||
| 480 | } | ||
| 481 | |||
| 482 | /** | ||
| 483 | * Returns the total number of compressed bytes output so far.</p> | ||
| 484 | * | ||
| 485 | * @return the total (non-negative) number of compressed bytes output so far | ||
| 486 | * @since 1.5 | ||
| 487 | */ | ||
| 488 | public long getBytesWritten() { | ||
| 489 | synchronized (zsRef) { | ||
| 490 | ensureOpen(); | ||
| 491 | return getBytesWritten(zsRef.address()); | ||
| 492 | } | ||
| 493 | } | ||
| 494 | |||
| 495 | /** | ||
| 496 | * Resets deflater so that a new set of input data can be processed. | ||
| 497 | * Keeps current compression level and strategy settings. | ||
| 498 | */ | ||
| 499 | public void reset() { | ||
| 500 | synchronized (zsRef) { | ||
| 501 | ensureOpen(); | ||
| 502 | reset(zsRef.address()); | ||
| 503 | finish = false; | ||
| 504 | finished = false; | ||
| 505 | off = len = 0; | ||
| 506 | } | ||
| 507 | } | ||
| 508 | |||
| 509 | /** | ||
| 510 | * Closes the compressor and discards any unprocessed input. | ||
| 511 | * This method should be called when the compressor is no longer | ||
| 512 | * being used, but will also be called automatically by the | ||
| 513 | * finalize() method. Once this method is called, the behavior | ||
| 514 | * of the Deflater object is undefined. | ||
| 515 | */ | ||
| 516 | public void end() { | ||
| 517 | synchronized (zsRef) { | ||
| 518 | long addr = zsRef.address(); | ||
| 519 | zsRef.clear(); | ||
| 520 | if (addr != 0) { | ||
| 521 | end(addr); | ||
| 522 | buf = null; | ||
| 523 | } | ||
| 524 | } | ||
| 525 | } | ||
| 526 | |||
| 527 | /** | ||
| 528 | * Closes the compressor when garbage is collected. | ||
| 529 | */ | ||
| 530 | protected void finalize() { | ||
| 531 | end(); | ||
| 532 | } | ||
| 533 | |||
| 534 | private void ensureOpen() { | ||
| 535 | assert Thread.holdsLock(zsRef); | ||
| 536 | if (zsRef.address() == 0) | ||
| 537 | throw new NullPointerException("Deflater has been closed"); | ||
| 538 | } | ||
| 539 | |||
| 540 | private static native void initIDs(); | ||
| 541 | private native static long init(int level, int strategy, boolean nowrap); | ||
| 542 | private native static void setDictionary(long addr, byte[] b, int off, int len); | ||
| 543 | private native int deflateBytes(long addr, byte[] b, int off, int len, | ||
| 544 | int flush); | ||
| 545 | private native static int getAdler(long addr); | ||
| 546 | private native static long getBytesRead(long addr); | ||
| 547 | private native static long getBytesWritten(long addr); | ||
| 548 | private native static void reset(long addr); | ||
| 549 | private native static void end(long addr); | ||
| 550 | } | ||