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88 lines
3.0 KiB
C#
88 lines
3.0 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 DiscJuggler disc 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 © 2011-2025 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.IO;
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using Aaru.CommonTypes.Interfaces;
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using Aaru.Helpers;
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using Aaru.Logging;
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namespace Aaru.Images;
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public sealed partial class DiscJuggler
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{
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#region IOpticalMediaImage Members
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/// <inheritdoc />
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public bool Identify(IFilter imageFilter)
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{
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_imageStream = imageFilter.GetDataForkStream();
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_imageStream.Seek(-4, SeekOrigin.End);
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var dscLenB = new byte[4];
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_imageStream.EnsureRead(dscLenB, 0, 4);
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var dscLen = BitConverter.ToInt32(dscLenB, 0);
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AaruLogging.Debug(MODULE_NAME, "dscLen = {0}", dscLen);
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if(dscLen >= _imageStream.Length) return false;
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var descriptor = new byte[dscLen];
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_imageStream.Seek(-dscLen, SeekOrigin.End);
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_imageStream.EnsureRead(descriptor, 0, dscLen);
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// Sessions
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if(descriptor.Length < 1 || descriptor[0] > 99 || descriptor[0] == 0) return false;
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// Seems all sessions start with this data
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if(descriptor[1] != 0x00 ||
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descriptor[3] != 0x00 ||
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descriptor[4] != 0x00 ||
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descriptor[5] != 0x00 ||
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descriptor[6] != 0x00 ||
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descriptor[7] != 0x00 ||
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descriptor[8] != 0x00 ||
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descriptor[9] != 0x00 ||
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descriptor[10] != 0x01 ||
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descriptor[11] != 0x00 ||
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descriptor[12] != 0x00 ||
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descriptor[13] != 0x00 ||
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descriptor[14] != 0xFF ||
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descriptor[15] != 0xFF)
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return false;
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// Too many tracks
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return descriptor[2] <= 99;
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}
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#endregion
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} |