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101 lines
3.8 KiB
C#
101 lines
3.8 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : Plan9.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 Plan9 partitions.
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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 Aaru.CommonTypes;
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using Aaru.CommonTypes.Enums;
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using Aaru.CommonTypes.Interfaces;
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using Aaru.Helpers;
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namespace Aaru.Partitions;
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// This is the most stupid or the most intelligent partition scheme ever done, pick or take
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// At sector 1 from offset, text resides (yes, TEXT) in following format:
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// "part type start end\n"
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// One line per partition, start and end relative to offset
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// e.g.: "part nvram 10110 10112\npart fossil 10112 3661056\n"
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/// <inheritdoc />
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/// <summary>Implements decoding of Plan-9 partitions</summary>
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public sealed class Plan9 : IPartition
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{
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#region IPartition Members
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/// <inheritdoc />
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public string Name => Localization.Plan9_Name;
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/// <inheritdoc />
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public Guid Id => new("F0BF4FFC-056E-4E7C-8B65-4EAEE250ADD9");
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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<Partition> partitions, ulong sectorOffset)
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{
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partitions = [];
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if(sectorOffset + 2 >= imagePlugin.Info.Sectors) return false;
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ErrorNumber errno = imagePlugin.ReadSector(sectorOffset + 1, false, out byte[] sector, out _);
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if(errno != ErrorNumber.NoError) return false;
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// While all of Plan9 is supposedly UTF-8, it uses ASCII strcmp for reading its partition table
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string[] really = StringHandlers.CToString(sector).Split('\n');
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foreach(string[] tokens in really.TakeWhile(static part => part.Length >= 5 && part[..5] == "part ")
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.Select(static part => part.Split(' '))
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.TakeWhile(static tokens => tokens.Length == 4))
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{
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if(!ulong.TryParse(tokens[2], out ulong start) || !ulong.TryParse(tokens[3], out ulong end)) break;
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var part = new Partition
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{
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Length = end - start + 1,
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Offset = (start + sectorOffset) * imagePlugin.Info.SectorSize,
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Scheme = Name,
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Sequence = (ulong)partitions.Count,
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Size = (end - start + 1) * imagePlugin.Info.SectorSize,
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Start = start + sectorOffset,
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Type = tokens[1]
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};
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partitions.Add(part);
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}
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return partitions.Count > 0;
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}
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#endregion
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} |