// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : Structs.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Disk image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
//     Contains structures for QEMU Copy-On-Write v2 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 © 2011-2018 Natalia Portillo
// ****************************************************************************/

using System.Runtime.InteropServices;

namespace DiscImageChef.DiscImages
{
    public partial class Qcow2
    {
        /// <summary>
        ///     QCOW header, big-endian
        /// </summary>
        [StructLayout(LayoutKind.Sequential, Pack = 1)]
        struct QCow2Header
        {
            /// <summary>
            ///     <see cref="Qcow2.QCOW_MAGIC" />
            /// </summary>
            public uint magic;
            /// <summary>
            ///     Must be 1
            /// </summary>
            public uint version;
            /// <summary>
            ///     Offset inside file to string containing backing file
            /// </summary>
            public ulong backing_file_offset;
            /// <summary>
            ///     Size of <see cref="backing_file_offset" />
            /// </summary>
            public uint backing_file_size;
            /// <summary>
            ///     Cluster bits
            /// </summary>
            public uint cluster_bits;
            /// <summary>
            ///     Size in bytes
            /// </summary>
            public ulong size;
            /// <summary>
            ///     Encryption method
            /// </summary>
            public uint crypt_method;
            /// <summary>
            ///     Size of L1 table
            /// </summary>
            public uint l1_size;
            /// <summary>
            ///     Offset to L1 table
            /// </summary>
            public ulong l1_table_offset;
            /// <summary>
            ///     Offset to reference count table
            /// </summary>
            public ulong refcount_table_offset;
            /// <summary>
            ///     How many clusters does the refcount table span
            /// </summary>
            public uint refcount_table_clusters;
            /// <summary>
            ///     Number of snapshots
            /// </summary>
            public uint nb_snapshots;
            /// <summary>
            ///     Offset to QCowSnapshotHeader
            /// </summary>
            public ulong snapshots_offset;

            // Added in version 3
            public ulong features;
            public ulong compat_features;
            public ulong autoclear_features;
            public uint  refcount_order;
            public uint  header_length;
        }
    }
}