// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : Structs.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Disk image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
//     Contains structures for HD-Copy 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 © 2017-2023 Michael Drüing
// Copyright © 2011-2023 Natalia Portillo
// ****************************************************************************/

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

namespace Aaru.DiscImages
{
    [SuppressMessage("ReSharper", "UnusedType.Local")]
    public sealed partial class HdCopy
    {
        /// <summary>The global header of a HDCP image file</summary>
        [StructLayout(LayoutKind.Sequential, Pack = 1)]
        struct FileHeader
        {
            /// <summary>Last cylinder (zero-based)</summary>
            public byte lastCylinder;

            /// <summary>Sectors per track</summary>
            public byte sectorsPerTrack;

            /// <summary>
            ///     The track map. It contains one byte for each track. Up to 82 tracks (41 tracks * 2 sides) are supported. 0
            ///     means track is not present, 1 means it is present. The first 2 tracks are always present.
            /// </summary>
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 2 * 82)]
            public byte[] trackMap;
        }

        /// <summary>The header for a RLE-compressed block</summary>
        [StructLayout(LayoutKind.Sequential, Pack = 1)]
        readonly struct BlockHeader
        {
            /// <summary>The length of the compressed block, in bytes. Little-endian.</summary>
            public readonly ushort length;

            /// <summary>The byte value used as RLE escape sequence</summary>
            public readonly byte escape;
        }
    }
}