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52 lines
1.9 KiB
C#
52 lines
1.9 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : Helpers.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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// Contains helpers for 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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namespace Aaru.Images;
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public sealed partial class DiskCopy42
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{
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static uint CheckSum(byte[] buffer)
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{
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uint dc42Chk = 0;
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if((buffer.Length & 0x01) == 0x01) return 0xFFFFFFFF;
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for(uint i = 0; i < buffer.Length; i += 2)
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{
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dc42Chk += (uint)(buffer[i] << 8);
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dc42Chk += buffer[i + 1];
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dc42Chk = dc42Chk >> 1 | dc42Chk << 31;
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}
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return dc42Chk;
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}
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} |