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65 lines
2.1 KiB
C#
65 lines
2.1 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : Compression.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Disk image plugins.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Contains compression algorithm for Apridisk disk images.
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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 © 2011-2023 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.IO;
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namespace Aaru.Images;
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public sealed partial class Apridisk
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{
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static uint Decompress(byte[] compressed, out byte[] decompressed)
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{
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var readp = 0;
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int cLen = compressed.Length;
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var buffer = new MemoryStream();
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uint uLen = 0;
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while(cLen >= 3)
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{
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var blklen = BitConverter.ToUInt16(compressed, readp);
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readp += 2;
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for(var i = 0; i < blklen; i++)
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buffer.WriteByte(compressed[readp]);
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uLen += blklen;
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readp++;
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cLen -= 3;
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}
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decompressed = buffer.ToArray();
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return uLen;
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}
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} |