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92 lines
3.8 KiB
C#
92 lines
3.8 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : BZip2.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Compression algorithms.
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//
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// --[ License ] --------------------------------------------------------------
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2011-2025 Natalia Portillo
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// ****************************************************************************/
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using System.IO;
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using System.Runtime.InteropServices;
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using Ionic.BZip2;
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namespace Aaru.Compression;
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/// <summary>Implements the BZIP2 compression algorithm</summary>
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public partial class BZip2
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{
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/// <summary>Set to <c>true</c> if this algorithm is supported, <c>false</c> otherwise.</summary>
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public static bool IsSupported => true;
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[LibraryImport("libAaru.Compression.Native", SetLastError = true)]
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private static partial int AARU_bzip2_decode_buffer(byte[] dstBuffer, ref uint dstSize, byte[] srcBuffer,
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uint srcSize);
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[LibraryImport("libAaru.Compression.Native", SetLastError = true)]
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private static partial int AARU_bzip2_encode_buffer(byte[] dstBuffer, ref uint dstSize, byte[] srcBuffer,
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uint srcSize, int blockSize100K);
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/// <summary>Decodes a buffer compressed with BZIP2</summary>
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/// <param name="source">Encoded buffer</param>
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/// <param name="destination">Buffer where to write the decoded data</param>
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/// <returns>The number of decoded bytes</returns>
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public static int DecodeBuffer(byte[] source, byte[] destination)
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{
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var destinationSize = (uint)destination.Length;
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if(Native.IsSupported)
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{
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AARU_bzip2_decode_buffer(destination, ref destinationSize, source, (uint)source.Length);
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return (int)destinationSize;
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}
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using var cmpMs = new MemoryStream(source);
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using var decStream = new BZip2InputStream(cmpMs, false);
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return decStream.Read(destination, 0, destination.Length);
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}
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/// <summary>Compresses a buffer using BZIP2</summary>
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/// <param name="source">Data to compress</param>
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/// <param name="destination">Buffer to store the compressed data</param>
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/// <param name="blockSize100K">Block size in 100KiB units</param>
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/// <returns></returns>
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public static int EncodeBuffer(byte[] source, byte[] destination, int blockSize100K)
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{
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var destinationSize = (uint)destination.Length;
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if(Native.IsSupported)
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{
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AARU_bzip2_encode_buffer(destination, ref destinationSize, source, (uint)source.Length, blockSize100K);
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return (int)destinationSize;
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}
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using var cmpMs = new MemoryStream(source);
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using var encStream = new BZip2OutputStream(new MemoryStream(destination), blockSize100K);
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encStream.Write(source, 0, source.Length);
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return source.Length;
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}
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} |