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103 lines
4.4 KiB
C#
103 lines
4.4 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : LZMA.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 © 2011-2022 Natalia Portillo
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// ****************************************************************************/
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namespace Aaru.Compression;
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using System.IO;
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using System.Runtime.InteropServices;
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using SharpCompress.Compressors.LZMA;
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public class LZMA
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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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[DllImport("libAaru.Compression.Native", SetLastError = true)]
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static extern int AARU_lzma_decode_buffer(byte[] dst_buffer, ref nuint dst_size, byte[] src_buffer,
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ref nuint src_size, byte[] props, nuint propsSize);
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[DllImport("libAaru.Compression.Native", SetLastError = true)]
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static extern int AARU_lzma_encode_buffer(byte[] dst_buffer, ref nuint dst_size, byte[] src_buffer, nuint src_size,
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byte[] outProps, ref nuint outPropsSize, int level, uint dictSize, int lc,
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int lp, int pb, int fb, int numThreads);
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/// <summary>Decodes a buffer compressed with LZMA</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, byte[] properties)
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{
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if(Native.IsSupported)
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{
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var srcSize = (nuint)source.Length;
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var dstSize = (nuint)destination.Length;
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AARU_lzma_decode_buffer(destination, ref dstSize, source, ref srcSize, properties,
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(nuint)properties.Length);
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return (int)dstSize;
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}
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using var cmpMs = new MemoryStream(source);
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using var lzmaBlock = new LzmaStream(properties, cmpMs);
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lzmaBlock.Read(destination, 0, destination.Length);
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return 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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/// <returns></returns>
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public static int EncodeBuffer(byte[] source, byte[] destination, out byte[] properties, int level, uint dictSize,
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int lc, int lp, int pb, int fb)
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{
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if(Native.IsSupported)
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{
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properties = new byte[5];
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var dstSize = (nuint)destination.Length;
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var propsSize = (nuint)properties.Length;
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var srcSize = (nuint)source.Length;
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AARU_lzma_encode_buffer(destination, ref dstSize, source, srcSize, properties, ref propsSize, level,
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dictSize, lc, lp, pb, fb, 0);
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return (int)dstSize;
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}
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var _lzmaEncoderProperties = new LzmaEncoderProperties(true, (int)dictSize, fb);
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using var lzmaStream = new LzmaStream(_lzmaEncoderProperties, false, new MemoryStream(destination));
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lzmaStream.Write(source, 0, source.Length);
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properties = new byte[lzmaStream.Properties.Length];
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lzmaStream.Properties.CopyTo(properties, 0);
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return destination.Length;
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}
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} |