// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : Structs.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Disk image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
//     Contains structures for IBM SaveDskF disk images.
//
// --[ 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 © 2011-2025 Natalia Portillo
// ****************************************************************************/

using System.Runtime.InteropServices;

namespace Aaru.Images;

public sealed partial class SaveDskF
{
#region Nested type: Header

    [StructLayout(LayoutKind.Sequential, Pack = 1)]
    struct Header
    {
        /// <summary>0x00 magic number</summary>
        public ushort magic;
        /// <summary>0x02 media type from FAT</summary>
        public readonly ushort mediaType;
        /// <summary>0x04 bytes per sector</summary>
        public ushort sectorSize;
        /// <summary>0x06 sectors per cluster - 1</summary>
        public readonly byte clusterMask;
        /// <summary>0x07 log2(cluster / sector)</summary>
        public readonly byte clusterShift;
        /// <summary>0x08 reserved sectors</summary>
        public readonly ushort reservedSectors;
        /// <summary>0x0A copies of FAT</summary>
        public readonly byte fatCopies;
        /// <summary>0x0B entries in root directory</summary>
        public readonly ushort rootEntries;
        /// <summary>0x0D first cluster</summary>
        public readonly ushort firstCluster;
        /// <summary>0x0F clusters present in image</summary>
        public readonly ushort clustersCopied;
        /// <summary>0x11 sectors per FAT</summary>
        public readonly byte sectorsPerFat;
        /// <summary>0x12 sector number of root directory</summary>
        public readonly ushort rootDirectorySector;
        /// <summary>0x14 sum of all image bytes</summary>
        public uint checksum;
        /// <summary>0x18 cylinders</summary>
        public ushort cylinders;
        /// <summary>0x1A heads</summary>
        public ushort heads;
        /// <summary>0x1C sectors per track</summary>
        public ushort sectorsPerTrack;
        /// <summary>0x1E always zero</summary>
        public readonly uint padding;
        /// <summary>0x22 sectors present in image</summary>
        public ushort sectorsCopied;
        /// <summary>0x24 offset to comment</summary>
        public ushort commentOffset;
        /// <summary>0x26 offset to data</summary>
        public ushort dataOffset;
    }

#endregion
}