de.carne.nio.compression.bzip2.Bzip2 Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of java-compression Show documentation
Java compression library
There is a newer version: 5.0.0
/*
 * Copyright (c) 2016-2018 Holger de Carne and contributors, All Rights Reserved.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser Public License
 * along with this program.  If not, see .
 */
package de.carne.nio.compression.bzip2;

/**
 * Bzip2 constants
 */
final class Bzip2 {

	private Bzip2() {
		// Prevent instantiation
	}

	static final int BLOCK_SIZE_UNIT = 100000;
	static final int MIN_BLOCK_SIZE = BLOCK_SIZE_UNIT;
	static final int MAX_BLOCK_SIZE = 9 * BLOCK_SIZE_UNIT;
	static final int MIN_HUFFMAN_COUNT = 2;
	static final int MAX_HUFFMAN_COUNT = 6;
	static final int MAX_HUFFMAN_BITS = 20;
	static final int MAX_HUFFMAN_SYMBOL_COUNT = 258;
	static final int MIN_SELECTOR_COUNT = 1;
	static final int MAX_SELECTOR_COUNT = 2 + (MAX_BLOCK_SIZE / 50);

	static final int[] RNDTABLE = new int[] { 619, 720, 127, 481, 931, 816, 813, 233, 566, 247, 985, 724, 205, 454, 863,
			491, 741, 242, 949, 214, 733, 859, 335, 708, 621, 574, 73, 654, 730, 472, 419, 436, 278, 496, 867, 210, 399,
			680, 480, 51, 878, 465, 811, 169, 869, 675, 611, 697, 867, 561, 862, 687, 507, 283, 482, 129, 807, 591, 733,
			623, 150, 238, 59, 379, 684, 877, 625, 169, 643, 105, 170, 607, 520, 932, 727, 476, 693, 425, 174, 647, 73,
			122, 335, 530, 442, 853, 695, 249, 445, 515, 909, 545, 703, 919, 874, 474, 882, 500, 594, 612, 641, 801,
			220, 162, 819, 984, 589, 513, 495, 799, 161, 604, 958, 533, 221, 400, 386, 867, 600, 782, 382, 596, 414,
			171, 516, 375, 682, 485, 911, 276, 98, 553, 163, 354, 666, 933, 424, 341, 533, 870, 227, 730, 475, 186, 263,
			647, 537, 686, 600, 224, 469, 68, 770, 919, 190, 373, 294, 822, 808, 206, 184, 943, 795, 384, 383, 461, 404,
			758, 839, 887, 715, 67, 618, 276, 204, 918, 873, 777, 604, 560, 951, 160, 578, 722, 79, 804, 96, 409, 713,
			940, 652, 934, 970, 447, 318, 353, 859, 672, 112, 785, 645, 863, 803, 350, 139, 93, 354, 99, 820, 908, 609,
			772, 154, 274, 580, 184, 79, 626, 630, 742, 653, 282, 762, 623, 680, 81, 927, 626, 789, 125, 411, 521, 938,
			300, 821, 78, 343, 175, 128, 250, 170, 774, 972, 275, 999, 639, 495, 78, 352, 126, 857, 956, 358, 619, 580,
			124, 737, 594, 701, 612, 669, 112, 134, 694, 363, 992, 809, 743, 168, 974, 944, 375, 748, 52, 600, 747, 642,
			182, 862, 81, 344, 805, 988, 739, 511, 655, 814, 334, 249, 515, 897, 955, 664, 981, 649, 113, 974, 459, 893,
			228, 433, 837, 553, 268, 926, 240, 102, 654, 459, 51, 686, 754, 806, 760, 493, 403, 415, 394, 687, 700, 946,
			670, 656, 610, 738, 392, 760, 799, 887, 653, 978, 321, 576, 617, 626, 502, 894, 679, 243, 440, 680, 879,
			194, 572, 640, 724, 926, 56, 204, 700, 707, 151, 457, 449, 797, 195, 791, 558, 945, 679, 297, 59, 87, 824,
			713, 663, 412, 693, 342, 606, 134, 108, 571, 364, 631, 212, 174, 643, 304, 329, 343, 97, 430, 751, 497, 314,
			983, 374, 822, 928, 140, 206, 73, 263, 980, 736, 876, 478, 430, 305, 170, 514, 364, 692, 829, 82, 855, 953,
			676, 246, 369, 970, 294, 750, 807, 827, 150, 790, 288, 923, 804, 378, 215, 828, 592, 281, 565, 555, 710, 82,
			896, 831, 547, 261, 524, 462, 293, 465, 502, 56, 661, 821, 976, 991, 658, 869, 905, 758, 745, 193, 768, 550,
			608, 933, 378, 286, 215, 979, 792, 961, 61, 688, 793, 644, 986, 403, 106, 366, 905, 644, 372, 567, 466, 434,
			645, 210, 389, 550, 919, 135, 780, 773, 635, 389, 707, 100, 626, 958, 165, 504, 920, 176, 193, 713, 857,
			265, 203, 50, 668, 108, 645, 990, 626, 197, 510, 357, 358, 850, 858, 364, 936, 638 };

	static final int[] CRCTABLE = new int[256];

	static {
		for (int i = 0; i < CRCTABLE.length; i++) {
			int r = (i << 24);

			for (int j = 8; j > 0; j--) {
				r = ((r & 0x80000000) != 0 ? ((r << 1) ^ 0x04c11db7) : (r << 1));
			}
			CRCTABLE[i] = r;
		}
	}

}