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98 lines
3.1 KiB
C#
98 lines
3.1 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 Apple Disk Archival/Retrieval Tool format.
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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.IO;
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using Aaru.CommonTypes.Interfaces;
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using Aaru.Helpers;
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namespace Aaru.Images;
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public sealed partial class Dart
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{
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#region IMediaImage Members
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/// <inheritdoc />
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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 < 84) return false;
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stream.Seek(0, SeekOrigin.Begin);
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var headerB = new byte[Marshal.SizeOf<Header>()];
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stream.EnsureRead(headerB, 0, Marshal.SizeOf<Header>());
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Header header = Marshal.ByteArrayToStructureBigEndianGenerated<Header>(headerB);
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if(header.srcCmp > COMPRESS_NONE) return false;
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int expectedMaxSize = 84 + header.srcSize * 2 * 524;
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switch(header.srcType)
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{
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case DISK_MAC:
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if(header.srcSize != SIZE_MAC_SS && header.srcSize != SIZE_MAC) return false;
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break;
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case DISK_LISA:
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if(header.srcSize != SIZE_LISA) return false;
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break;
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case DISK_APPLE2:
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if(header.srcSize != SIZE_APPLE2) return false;
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break;
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case DISK_MAC_HD:
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if(header.srcSize != SIZE_MAC_HD) return false;
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expectedMaxSize += 64;
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break;
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case DISK_DOS:
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if(header.srcSize != SIZE_DOS) return false;
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break;
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case DISK_DOS_HD:
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if(header.srcSize != SIZE_DOS_HD) return false;
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expectedMaxSize += 64;
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break;
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default:
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return false;
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}
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return stream.Length <= expectedMaxSize;
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}
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#endregion
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} |