Aaru/DiscImageChef.Filesystems/AppleCommon/Structs.cs

// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : AppleHFS.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Apple Hierarchical File System plugin.
//
// --[ Description ] ----------------------------------------------------------
//
//     Identifies the Apple Hierarchical File System and shows information.
//
// --[ 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 © 2011-2020 Natalia Portillo
// ****************************************************************************/

using System.Runtime.InteropServices;

namespace DiscImageChef.Filesystems
{
    // Information from Inside Macintosh
    // https://developer.apple.com/legacy/library/documentation/mac/pdf/Files/File_Manager.pdf
    internal static partial class AppleCommon
    {
        /// <summary>Should be sectors 0 and 1 in volume, followed by boot code</summary>
        [StructLayout(LayoutKind.Sequential, Pack = 1)]
        struct BootBlock // Should be sectors 0 and 1 in volume
        {
            /// <summary>0x000, Signature, 0x4C4B if bootable</summary>
            public readonly ushort bbID;
            /// <summary>0x002, Branch</summary>
            public readonly uint bbEntry;
            /// <summary>0x007, Boot block version</summary>
            public readonly ushort bbVersion;
            /// <summary>0x006, Boot block flags</summary>
            public readonly short bbPageFlags;
            /// <summary>0x00A, System file name (16 bytes)</summary>
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
            public readonly byte[] bbSysName;
            /// <summary>0x01A, Finder file name (16 bytes)</summary>
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
            public readonly byte[] bbShellName;
            /// <summary>0x02A, Debugger file name (16 bytes)</summary>
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
            public readonly byte[] bbDbg1Name;
            /// <summary>0x03A, Disassembler file name (16 bytes)</summary>
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
            public readonly byte[] bbDbg2Name;
            /// <summary>0x04A, Startup screen file name (16 bytes)</summary>
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
            public readonly byte[] bbScreenName;
            /// <summary>0x05A, First program to execute on boot (16 bytes)</summary>
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
            public readonly byte[] bbHelloName;
            /// <summary>0x06A, Clipboard file name (16 bytes)</summary>
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
            public readonly byte[] bbScrapName;
            /// <summary>0x07A, 1/4 of maximum opened at a time files</summary>
            public readonly ushort bbCntFCBs;
            /// <summary>0x07C, Event queue size</summary>
            public readonly ushort bbCntEvts;
            /// <summary>0x07E, Heap size on a Mac with 128KiB of RAM</summary>
            public readonly uint bb128KSHeap;
            /// <summary>0x082, Heap size on a Mac with 256KiB of RAM</summary>
            public readonly uint bb256KSHeap;
            /// <summary>0x086, Heap size on a Mac with 512KiB of RAM or more</summary>
            public readonly uint bbSysHeapSize;
            /// <summary>0x08A, Padding</summary>
            public readonly ushort filler;
            /// <summary>0x08C, Additional system heap space</summary>
            public readonly uint bbSysHeapExtra;
            /// <summary>0x090, Fraction of RAM for system heap</summary>
            public readonly uint bbSysHeapFract;
        }
    }
}