Aaru/DiscImageChef.DiscImages/NDIF/Structs.cs

// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : Structs.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Disk image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
//     Contains structures for Apple New Disk Image Format.
//
// --[ 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 © 2011-2019 Natalia Portillo
// ****************************************************************************/

using System;
using System.Runtime.InteropServices;

namespace DiscImageChef.DiscImages
{
    public partial class Ndif
    {
        [StructLayout(LayoutKind.Sequential, Pack = 1)]
        struct ChunkHeader
        {
            /// <summary>
            ///     Version
            /// </summary>
            public short version;
            /// <summary>
            ///     Filesystem ID
            /// </summary>
            public short driver;
            /// <summary>
            ///     Disk image name, Str63 (Pascal string)
            /// </summary>
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)]
            public byte[] name;
            /// <summary>
            ///     Sectors in image
            /// </summary>
            public uint sectors;
            /// <summary>
            ///     Maximum number of sectors per chunk
            /// </summary>
            public uint maxSectorsPerChunk;
            /// <summary>
            ///     Offset to add to every chunk offset
            /// </summary>
            public uint dataOffset;
            /// <summary>
            ///     CRC28 of whole image
            /// </summary>
            public uint crc;
            /// <summary>
            ///     Set to 1 if segmented
            /// </summary>
            public uint segmented;
            /// <summary>
            ///     Unknown
            /// </summary>
            public uint p1;
            /// <summary>
            ///     Unknown
            /// </summary>
            public uint p2;
            /// <summary>
            ///     Unknown, spare?
            /// </summary>
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 5)]
            public uint[] unknown;
            /// <summary>
            ///     Set to 1 by ShrinkWrap if image is encrypted
            /// </summary>
            public uint encrypted;
            /// <summary>
            ///     Set by ShrinkWrap if image is encrypted, value is the same for same password
            /// </summary>
            public uint hash;
            /// <summary>
            ///     How many chunks follow the header
            /// </summary>
            public uint chunks;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 1)]
        struct BlockChunk
        {
            /// <summary>
            ///     Starting sector, 3 bytes
            /// </summary>
            public uint sector;
            /// <summary>
            ///     Chunk type
            /// </summary>
            public byte type;
            /// <summary>
            ///     Offset in start of chunk
            /// </summary>
            public uint offset;
            /// <summary>
            ///     Length in bytes of chunk
            /// </summary>
            public uint length;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 1)]
        struct SegmentHeader
        {
            /// <summary>
            ///     Segment #
            /// </summary>
            public ushort segment;
            /// <summary>
            ///     How many segments
            /// </summary>
            public ushort segments;
            /// <summary>
            ///     Seems to be a Guid, changes with different images, same for all segments of same image
            /// </summary>
            public Guid segmentId;
            /// <summary>
            ///     Seems to be a CRC28 of this segment, unchecked
            /// </summary>
            public uint crc;
        }
    }
}