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72 lines
3.1 KiB
C#
72 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 : Verify.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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// Verifies Apple DiskCopy 4.2 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.Console;
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namespace Aaru.DiscImages
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{
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public sealed partial class DiskCopy42
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{
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public bool? VerifyMediaImage()
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{
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byte[] data = new byte[header.DataSize];
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byte[] tags = new byte[header.TagSize];
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uint tagsChk = 0;
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AaruConsole.DebugWriteLine("DC42 plugin", "Reading data");
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Stream dataStream = dc42ImageFilter.GetDataForkStream();
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dataStream.Seek(dataOffset, SeekOrigin.Begin);
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dataStream.Read(data, 0, (int)header.DataSize);
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AaruConsole.DebugWriteLine("DC42 plugin", "Calculating data checksum");
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uint dataChk = CheckSum(data);
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AaruConsole.DebugWriteLine("DC42 plugin", "Calculated data checksum = 0x{0:X8}", dataChk);
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AaruConsole.DebugWriteLine("DC42 plugin", "Stored data checksum = 0x{0:X8}", header.DataChecksum);
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if(header.TagSize <= 0)
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return dataChk == header.DataChecksum && tagsChk == header.TagChecksum;
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AaruConsole.DebugWriteLine("DC42 plugin", "Reading tags");
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Stream tagStream = dc42ImageFilter.GetDataForkStream();
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tagStream.Seek(tagOffset, SeekOrigin.Begin);
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tagStream.Read(tags, 0, (int)header.TagSize);
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AaruConsole.DebugWriteLine("DC42 plugin", "Calculating tag checksum");
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tagsChk = CheckSum(tags);
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AaruConsole.DebugWriteLine("DC42 plugin", "Calculated tag checksum = 0x{0:X8}", tagsChk);
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AaruConsole.DebugWriteLine("DC42 plugin", "Stored tag checksum = 0x{0:X8}", header.TagChecksum);
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return dataChk == header.DataChecksum && tagsChk == header.TagChecksum;
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}
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}
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} |