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82 lines
3.4 KiB
C#
82 lines
3.4 KiB
C#
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// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : Structs.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Fossil filesystem plugin
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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 © 2011-2023 Natalia Portillo
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// ****************************************************************************/
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using System.Runtime.InteropServices;
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namespace Aaru.Filesystems;
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/// <inheritdoc />
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/// <summary>Implements detection for the Plan-9 Fossil on-disk filesystem</summary>
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public sealed partial class Fossil
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{
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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readonly struct Header
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{
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/// <summary>Magic number</summary>
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public readonly uint magic;
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/// <summary>Header version</summary>
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public readonly ushort version;
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/// <summary>Block size</summary>
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public readonly ushort blockSize;
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/// <summary>Block containing superblock</summary>
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public readonly uint super;
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/// <summary>Block containing labels</summary>
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public readonly uint label;
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/// <summary>Where do data blocks start</summary>
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public readonly uint data;
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/// <summary>How many data blocks does it have</summary>
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public readonly uint end;
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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readonly struct SuperBlock
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{
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/// <summary>Magic number</summary>
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public readonly uint magic;
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/// <summary>Header version</summary>
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public readonly ushort version;
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/// <summary>file system low epoch</summary>
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public readonly uint epochLow;
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/// <summary>file system high(active) epoch</summary>
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public readonly uint epochHigh;
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/// <summary>next qid to allocate</summary>
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public readonly ulong qid;
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/// <summary>data block number: root of active file system</summary>
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public readonly int active;
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/// <summary>data block number: root of next file system to archive</summary>
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public readonly int next;
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/// <summary>data block number: root of file system currently being archived</summary>
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public readonly int current;
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/// <summary>Venti score of last successful archive</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)]
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public readonly byte[] last;
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/// <summary>name of file system(just a comment)</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)]
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public readonly byte[] name;
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}
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}
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