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91 lines
3.7 KiB
C#
91 lines
3.7 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 MaxiDisk 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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using Aaru.Console;
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using Aaru.Helpers;
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namespace Aaru.DiscImages
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{
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public sealed partial class MaxiDisk
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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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if(stream.Length < 8)
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return false;
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byte[] buffer = new byte[8];
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stream.Seek(0, SeekOrigin.Begin);
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stream.Read(buffer, 0, buffer.Length);
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Header tmpHeader = Marshal.ByteArrayToStructureLittleEndian<Header>(buffer);
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AaruConsole.DebugWriteLine("MAXI Disk plugin", "tmp_header.unknown = {0}", tmpHeader.unknown);
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AaruConsole.DebugWriteLine("MAXI Disk plugin", "tmp_header.diskType = {0}", tmpHeader.diskType);
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AaruConsole.DebugWriteLine("MAXI Disk plugin", "tmp_header.heads = {0}", tmpHeader.heads);
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AaruConsole.DebugWriteLine("MAXI Disk plugin", "tmp_header.cylinders = {0}", tmpHeader.cylinders);
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AaruConsole.DebugWriteLine("MAXI Disk plugin", "tmp_header.bytesPerSector = {0}", tmpHeader.bytesPerSector);
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AaruConsole.DebugWriteLine("MAXI Disk plugin", "tmp_header.sectorsPerTrack = {0}",
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tmpHeader.sectorsPerTrack);
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AaruConsole.DebugWriteLine("MAXI Disk plugin", "tmp_header.unknown2 = {0}", tmpHeader.unknown2);
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AaruConsole.DebugWriteLine("MAXI Disk plugin", "tmp_header.unknown3 = {0}", tmpHeader.unknown3);
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// This is hardcoded
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// But its possible values are unknown...
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//if(tmp_header.diskType > 11)
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// return false;
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// Only floppies supported
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if(tmpHeader.heads == 0 ||
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tmpHeader.heads > 2)
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return false;
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// No floppies with more than this?
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if(tmpHeader.cylinders > 90)
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return false;
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// Maximum supported bps is 16384
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if(tmpHeader.bytesPerSector > 7)
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return false;
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int expectedFileSize = (tmpHeader.heads * tmpHeader.cylinders * tmpHeader.sectorsPerTrack *
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(128 << tmpHeader.bytesPerSector)) + 8;
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return expectedFileSize == stream.Length;
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}
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}
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} |