// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : Structs.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Atheos filesystem plugin.
//
// --[ License ] --------------------------------------------------------------
//
//     This library is free software; you can redistribute it and/or modify
//     it under the terms of the GNU Lesser General Public License as
//     published by the Free Software Foundation; either version 2.1 of the
//     License, or (at your option) any later version.
//
//     This library is distributed in the hope that it will be useful, but
//     WITHOUT ANY WARRANTY; without even the implied warranty of
//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
//     Lesser General Public License for more details.
//
//     You should have received a copy of the GNU Lesser General Public
//     License along with this library; if not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright © 2011-2026 Natalia Portillo
// ****************************************************************************/

using System.Diagnostics.CodeAnalysis;
using System.Runtime.InteropServices;

namespace Aaru.Filesystems;

/// <inheritdoc />
/// <summary>Implements detection for the AtheOS filesystem</summary>
[SuppressMessage("ReSharper", "UnusedMember.Local")]
public sealed partial class AtheOS
{
#region Nested type: SuperBlock

    /// <summary>Be superblock</summary>
    [StructLayout(LayoutKind.Sequential, Pack = 1)]
    readonly struct SuperBlock
    {
        /// <summary>0x000, Volume name, 32 bytes</summary>
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]
        public readonly byte[] name;
        /// <summary>0x020, "AFS1", 0x41465331</summary>
        public readonly uint magic1;
        /// <summary>0x024, "BIGE", 0x42494745</summary>
        public readonly uint fs_byte_order;
        /// <summary>0x028, Bytes per block</summary>
        public readonly uint block_size;
        /// <summary>0x02C, 1 &lt;&lt; block_shift == block_size</summary>
        public readonly uint block_shift;
        /// <summary>0x030, Blocks in volume</summary>
        public readonly long num_blocks;
        /// <summary>0x038, Used blocks in volume</summary>
        public readonly long used_blocks;
        /// <summary>0x040, Bytes per inode</summary>
        public readonly int inode_size;
        /// <summary>0x044, 0xDD121031</summary>
        public readonly uint magic2;
        /// <summary>0x048, Blocks per allocation group</summary>
        public readonly int blocks_per_ag;
        /// <summary>0x04C, 1 &lt;&lt; ag_shift == blocks_per_ag</summary>
        public readonly int ag_shift;
        /// <summary>0x050, Allocation groups in volume</summary>
        public readonly int num_ags;
        /// <summary>0x054, 0x434c454e if clean, 0x44495254 if dirty</summary>
        public readonly uint flags;
        /// <summary>0x058, Allocation group of journal</summary>
        public readonly int log_blocks_ag;
        /// <summary>0x05C, Start block of journal, inside ag</summary>
        public readonly ushort log_blocks_start;
        /// <summary>0x05E, Length in blocks of journal, inside ag</summary>
        public readonly ushort log_blocks_len;
        /// <summary>0x060, Start of journal</summary>
        public readonly long log_start;
        /// <summary>0x068, Valid block logs</summary>
        public readonly int log_valid_blocks;
        /// <summary>0x06C, Log size</summary>
        public readonly int log_size;
        /// <summary>0x070, 0x15B6830E</summary>
        public readonly uint magic3;
        /// <summary>0x074, Allocation group where root folder's i-node resides</summary>
        public readonly int root_dir_ag;
        /// <summary>0x078, Start in ag of root folder's i-node</summary>
        public readonly ushort root_dir_start;
        /// <summary>0x07A, As this is part of inode_addr, this is 1</summary>
        public readonly ushort root_dir_len;
        /// <summary>0x07C, Allocation group where pending-delete-files' i-node resides</summary>
        public readonly int deleted_ag;
        /// <summary>0x080, Start in ag of pending-delete-files' i-node</summary>
        public readonly ushort deleted_start;
        /// <summary>0x082, As this is part of inode_addr, this is 1</summary>
        public readonly ushort deleted_len;
        /// <summary>0x084, Allocation group where indices' i-node resides</summary>
        public readonly int indices_ag;
        /// <summary>0x088, Start in ag of indices' i-node</summary>
        public readonly ushort indices_start;
        /// <summary>0x08A, As this is part of inode_addr, this is 1</summary>
        public readonly ushort indices_len;
        /// <summary>0x08C, Size of bootloader</summary>
        public readonly int boot_size;
    }

#endregion
}