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76 lines
3.1 KiB
C#
76 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 © 2011-2025 Natalia Portillo
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// ****************************************************************************/
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using System.IO;
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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 DiskCopy42
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{
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#region IVerifiableImage Members
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/// <inheritdoc />
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public bool? VerifyMediaImage()
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{
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var data = new byte[header.DataSize];
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var tags = new byte[header.TagSize];
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uint tagsChk = 0;
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AaruLogging.Debug(MODULE_NAME, Localization.Reading_data);
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Stream dataStream = dc42ImageFilter.GetDataForkStream();
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dataStream.Seek(dataOffset, SeekOrigin.Begin);
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dataStream.EnsureRead(data, 0, (int)header.DataSize);
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AaruLogging.Debug(MODULE_NAME, Localization.Calculating_data_checksum);
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uint dataChk = CheckSum(data);
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AaruLogging.Debug(MODULE_NAME, Localization.Calculated_data_checksum_equals_0_X8, dataChk);
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AaruLogging.Debug(MODULE_NAME, Localization.Stored_data_checksum_equals_0_X8, header.DataChecksum);
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if(header.TagSize <= 0) return dataChk == header.DataChecksum && tagsChk == header.TagChecksum;
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AaruLogging.Debug(MODULE_NAME, Localization.Reading_tags);
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Stream tagStream = dc42ImageFilter.GetDataForkStream();
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tagStream.Seek(tagOffset, SeekOrigin.Begin);
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tagStream.EnsureRead(tags, 0, (int)header.TagSize);
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AaruLogging.Debug(MODULE_NAME, Localization.Calculating_tag_checksum);
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tagsChk = CheckSum(tags);
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AaruLogging.Debug(MODULE_NAME, Localization.Calculated_tag_checksum_equals_0_X8, tagsChk);
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AaruLogging.Debug(MODULE_NAME, Localization.Stored_tag_checksum_equals_0_X8, header.TagChecksum);
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return dataChk == header.DataChecksum && tagsChk == header.TagChecksum;
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}
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#endregion
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} |