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124 lines
4.1 KiB
C#
124 lines
4.1 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : Identify.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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// Identifies CisCopy 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 © 2011-2021 Natalia Portillo
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// ****************************************************************************/
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using System.IO;
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using Aaru.CommonTypes.Interfaces;
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namespace Aaru.DiscImages
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{
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public sealed partial class CisCopy
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{
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public bool Identify(IFilter imageFilter)
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{
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Stream stream = imageFilter.GetDataForkStream();
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stream.Seek(0, SeekOrigin.Begin);
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var type = (DiskType)stream.ReadByte();
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byte tracks;
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switch(type)
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{
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case DiskType.MD1DD8:
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case DiskType.MD1DD:
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case DiskType.MD2DD8:
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case DiskType.MD2DD:
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tracks = 80;
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break;
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case DiskType.MF2DD:
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case DiskType.MD2HD:
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case DiskType.MF2HD:
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tracks = 160;
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break;
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default: return false;
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}
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byte[] trackBytes = new byte[tracks];
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stream.Read(trackBytes, 0, tracks);
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for(int i = 0; i < tracks; i++)
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if(trackBytes[i] != (byte)TrackType.Copied &&
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trackBytes[i] != (byte)TrackType.Omitted &&
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trackBytes[i] != (byte)TrackType.OmittedAlternate)
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return false;
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var cmpr = (Compression)stream.ReadByte();
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if(cmpr != Compression.None &&
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cmpr != Compression.Normal &&
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cmpr != Compression.High)
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return false;
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switch(type)
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{
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case DiskType.MD1DD8:
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if(stream.Length > (40 * 1 * 8 * 512) + 82)
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return false;
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break;
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case DiskType.MD1DD:
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if(stream.Length > (40 * 1 * 9 * 512) + 82)
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return false;
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break;
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case DiskType.MD2DD8:
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if(stream.Length > (40 * 2 * 8 * 512) + 82)
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return false;
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break;
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case DiskType.MD2DD:
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if(stream.Length > (40 * 2 * 9 * 512) + 82)
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return false;
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break;
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case DiskType.MF2DD:
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if(stream.Length > (80 * 2 * 9 * 512) + 162)
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return false;
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break;
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case DiskType.MD2HD:
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if(stream.Length > (80 * 2 * 15 * 512) + 162)
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return false;
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break;
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case DiskType.MF2HD:
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if(stream.Length > (80 * 2 * 18 * 512) + 162)
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return false;
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break;
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}
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return true;
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}
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}
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} |