uses code from https://github.com/dolkensp/unp4k to read file from .p…

…4k container

ICSharpCode.SharpZipLib/BZip2/BZip2.cs

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+using System;
+using System.IO;
+
+namespace ICSharpCode.SharpZipLib.BZip2
+{
+	/// <summary>
+	/// An example class to demonstrate compression and decompression of BZip2 streams.
+	/// </summary>
+	public static class BZip2
+	{
+		/// <summary>
+		/// Decompress the <paramref name="inStream">input</paramref> writing 
+		/// uncompressed data to the <paramref name="outStream">output stream</paramref>
+		/// </summary>
+		/// <param name="inStream">The readable stream containing data to decompress.</param>
+		/// <param name="outStream">The output stream to receive the decompressed data.</param>
+		/// <param name="isStreamOwner">Both streams are closed on completion if true.</param>
+		public static void Decompress(Stream inStream, Stream outStream, bool isStreamOwner)
+		{
+			if (inStream == null || outStream == null) {
+				throw new Exception("Null Stream");
+			}
+
+			try {
+				using (BZip2InputStream bzipInput = new BZip2InputStream(inStream)) {
+					bzipInput.IsStreamOwner = isStreamOwner;
+					Core.StreamUtils.Copy(bzipInput, outStream, new byte[4096]);
+				}
+			} finally {
+				if (isStreamOwner) {
+					// inStream is closed by the BZip2InputStream if stream owner
+					outStream.Dispose();
+				}
+			}
+		}
+
+		/// <summary>
+		/// Compress the <paramref name="inStream">input stream</paramref> sending 
+		/// result data to <paramref name="outStream">output stream</paramref>
+		/// </summary>
+		/// <param name="inStream">The readable stream to compress.</param>
+		/// <param name="outStream">The output stream to receive the compressed data.</param>
+		/// <param name="isStreamOwner">Both streams are closed on completion if true.</param>
+		/// <param name="level">Block size acts as compression level (1 to 9) with 1 giving 
+		/// the lowest compression and 9 the highest.</param>
+		public static void Compress(Stream inStream, Stream outStream, bool isStreamOwner, int level)
+		{
+			if (inStream == null || outStream == null) {
+				throw new Exception("Null Stream");
+			}
+
+			try {
+				using (BZip2OutputStream bzipOutput = new BZip2OutputStream(outStream, level)) {
+					bzipOutput.IsStreamOwner = isStreamOwner;
+					Core.StreamUtils.Copy(inStream, bzipOutput, new byte[4096]);
+				}
+			} finally {
+				if (isStreamOwner) {
+					// outStream is closed by the BZip2OutputStream if stream owner
+					inStream.Dispose();
+				}
+			}
+		}
+
+	}
+}

ICSharpCode.SharpZipLib/BZip2/BZip2Constants.cs

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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()
+		{
+		}
+	}
+}

ICSharpCode.SharpZipLib/BZip2/BZip2Exception.cs

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+using System;
+
+namespace ICSharpCode.SharpZipLib.BZip2
+{
+	/// <summary>
+	/// BZip2Exception represents exceptions specific to BZip2 classes and code.
+	/// </summary>
+	public class BZip2Exception : SharpZipBaseException
+	{
+		/// <summary>
+		/// Initialise a new instance of <see cref="BZip2Exception" />.
+		/// </summary>
+		public BZip2Exception()
+		{
+		}
+
+		/// <summary>
+		/// Initialise a new instance of <see cref="BZip2Exception" /> with its message string.
+		/// </summary>
+		/// <param name="message">A <see cref="string"/> that describes the error.</param>
+		public BZip2Exception(string message)
+			: base(message)
+		{
+		}
+
+		/// <summary>
+		/// Initialise a new instance of <see cref="BZip2Exception" />.
+		/// </summary>
+		/// <param name="message">A <see cref="string"/> that describes the error.</param>
+		/// <param name="innerException">The <see cref="Exception"/> that caused this exception.</param>
+		public BZip2Exception(string message, Exception innerException)
+			: base(message, innerException)
+		{
+		}
+	}
+}