BZip2Constants.cs

// BZip2Constants.cs
// Copyright © 2000-2016 AlphaSierraPapa for the SharpZipLib Team
//
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namespace ICSharpCode.SharpZipLib.BZip2 
{
	
	/// <summary>
	/// Defines internal values for both compression and decompression
	/// </summary>
	internal sealed class BZip2Constants
	{
		/// <summary>
		/// Random numbers used to randomise repetitive blocks
		/// </summary>
		public readonly static int[] RandomNumbers = {
			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
		};

		/// <summary>
		/// When multiplied by compression parameter (1-9) gives the block size for compression
		/// 9 gives the best compression but uses the most memory.
		/// </summary>		
		public const int BaseBlockSize = 100000;
		
		/// <summary>
		/// Backend constant
		/// </summary>
		public const int MaximumAlphaSize = 258;
		
		/// <summary>
		/// Backend constant
		/// </summary>
		public const int MaximumCodeLength = 23;
		
		/// <summary>
		/// Backend constant
		/// </summary>
		public const int RunA = 0;
		
		/// <summary>
		/// Backend constant
		/// </summary>
		public const int RunB = 1;
		
		/// <summary>
		/// Backend constant
		/// </summary>
		public const int GroupCount = 6;
		
		/// <summary>
		/// Backend constant
		/// </summary>
		public const int GroupSize = 50;
		
		/// <summary>
		/// Backend constant
		/// </summary>
		public const int NumberOfIterations = 4;
		
		/// <summary>
		/// Backend constant
		/// </summary>
		public const int MaximumSelectors = (2 + (900000 / GroupSize));
		
		/// <summary>
		/// Backend constant
		/// </summary>
		public const int OvershootBytes = 20;
		
		private BZip2Constants()
		{
		}
	}
}
	
/* This file was derived from a file containing this license:
 * 
 * This file is a part of bzip2 and/or libbzip2, a program and
 * library for lossless, block-sorting data compression.
 * 
 * Copyright (C) 1996-1998 Julian R Seward.  All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
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 * 
 * 2. The origin of this software must not be misrepresented; you must 
 * not claim that you wrote the original software.  If you use this 
 * software in a product, an acknowledgment in the product 
 * documentation would be appreciated but is not required.
 * 
 * 3. Altered source versions must be plainly marked as such, and must
 * not be misrepresented as being the original software.
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 * 4. The name of the author may not be used to endorse or promote 
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 * 
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 * 
 * Java version ported by Keiron Liddle, Aftex Software <keiron@aftexsw.com> 1999-2001
 */