Showing the changes to java/pkg/java/util/zip/Deflater.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,550 @@ | ||
| 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 | +} | |