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123 lines
4.3 KiB
C#
123 lines
4.3 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : DEC.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Partitioning scheme plugins.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Manages DEC disklabels.
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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.Collections.Generic;
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using System.Linq;
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using System.Runtime.InteropServices;
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using Aaru.CommonTypes.Enums;
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using Aaru.CommonTypes.Interfaces;
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using Marshal = Aaru.Helpers.Marshal;
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namespace Aaru.Partitions;
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/// <inheritdoc />
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/// <summary>Implements decoding of DEC disklabels</summary>
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public sealed class DEC : IPartition
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{
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const int PT_MAGIC = 0x032957;
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const int PT_VALID = 1;
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#region Nested type: Label
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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readonly struct Label
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{
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 440)]
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public readonly byte[] padding;
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public readonly int pt_magic;
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public readonly int pt_valid;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
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public readonly Partition[] pt_part;
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}
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#endregion
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#region Nested type: Partition
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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readonly struct Partition
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{
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public readonly int pi_nblocks;
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public readonly uint pi_blkoff;
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}
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#endregion
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#region IPartition Members
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/// <inheritdoc />
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public string Name => Localization.DEC_Name;
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/// <inheritdoc />
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public Guid Id => new("58CEC3B7-3B93-4D47-86EE-D6DADE9D444F");
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/// <inheritdoc />
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public string Author => Authors.NATALIA_PORTILLO;
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/// <inheritdoc />
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public bool GetInformation(IMediaImage imagePlugin, out List<CommonTypes.Partition> partitions, ulong sectorOffset)
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{
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partitions = [];
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if(31 + sectorOffset >= imagePlugin.Info.Sectors) return false;
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ErrorNumber errno = imagePlugin.ReadSector(31 + sectorOffset, false, out byte[] sector, out _);
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if(errno != ErrorNumber.NoError || sector.Length < 512) return false;
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Label table = Marshal.ByteArrayToStructureLittleEndian<Label>(sector);
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if(table.pt_magic != PT_MAGIC || table.pt_valid != PT_VALID) return false;
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ulong counter = 0;
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foreach(CommonTypes.Partition part in table.pt_part.Select(entry => new CommonTypes.Partition
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{
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Start = entry.pi_blkoff,
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Offset = (ulong)(entry.pi_blkoff * sector.Length),
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Size = (ulong)entry.pi_nblocks,
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Length = (ulong)(entry.pi_nblocks * sector.Length),
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Sequence = counter,
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Scheme = Name
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})
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.Where(static part => part.Size > 0))
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{
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partitions.Add(part);
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counter++;
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}
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return true;
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}
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#endregion
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} |