// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : Structs.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Apple Macintosh File System plugin.
//
// --[ 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 © 2011-2026 Natalia Portillo
// ****************************************************************************/

using System;
using System.Diagnostics.CodeAnalysis;
using Aaru.CommonTypes.Interfaces;

#pragma warning disable 169

namespace Aaru.Filesystems;

// Information from Inside Macintosh Volume II
[SuppressMessage("ReSharper", "InconsistentNaming")]
[SuppressMessage("ReSharper", "NotAccessedField.Local")]
public sealed partial class AppleMFS
{
#region Nested type: AppleMfsDirNode

    sealed class AppleMfsDirNode : IDirNode
    {
        internal string[] _contents;
        internal int      _position;

#region IDirNode Members

        /// <inheritdoc />
        public string Path { get; init; }

#endregion
    }

#endregion

#region Nested type: AppleMfsFileNode

    sealed class AppleMfsFileNode : IFileNode
    {
        internal byte[] _cache;

#region IFileNode Members

        /// <inheritdoc />
        public string Path { get; init; }

        /// <inheritdoc />
        public long Length { get; init; }

        /// <inheritdoc />
        public long Offset { get; set; }

#endregion
    }

#endregion

#region Nested type: FileEntry

    struct FileEntry
    {
        /// <summary>0x00, Entry flags</summary>
        public FileFlags flFlags;
        /// <summary>0x01, Version number</summary>
        public byte flTyp;
        /// <summary>0x02, FinderInfo</summary>
        public AppleCommon.FInfo flUsrWds;
        /// <summary>0x12, file ID</summary>
        public uint flFlNum;
        /// <summary>0x16, first allocation block of data fork</summary>
        public ushort flStBlk;
        /// <summary>0x18, logical end-of-file of data fork</summary>
        public uint flLgLen;
        /// <summary>0x1C, physical end-of-file of data fork</summary>
        public uint flPyLen;
        /// <summary>0x20, first allocation block of resource fork</summary>
        public ushort flRStBlk;
        /// <summary>0x22, logical end-of-file of resource fork</summary>
        public uint flRLgLen;
        /// <summary>0x26, physical end-of-file of resource fork</summary>
        public uint flRPyLen;
        /// <summary>0x2A, date and time of creation</summary>
        public uint flCrDat;
        /// <summary>0x2E, date and time of last modification</summary>
        public uint flMdDat;
        /// <summary>0x32, file name prefixed with length</summary>
        public byte[] flNam;
    }

#endregion

#region Nested type: FileFlags

    [Flags]
    enum FileFlags : byte
    {
        Locked = 0x01,
        Used   = 0x80
    }

#endregion

#region Nested type: MasterDirectoryBlock

    /// <summary>Master Directory Block, should be at offset 0x0400 bytes in volume</summary>
    struct MasterDirectoryBlock
    {
        /// <summary>0x000, Signature, 0xD2D7</summary>
        public ushort drSigWord;
        /// <summary>0x002, Volume creation date</summary>
        public uint drCrDate;
        /// <summary>0x006, Volume last backup date</summary>
        public uint drLsBkUp;
        /// <summary>0x00A, Volume attributes</summary>
        public AppleCommon.VolumeAttributes drAtrb;
        /// <summary>0x00C, Volume number of files</summary>
        public ushort drNmFls;
        /// <summary>0x00E, First directory sector</summary>
        public ushort drDirSt;
        /// <summary>0x010, Length of directory in sectors</summary>
        public ushort drBlLen;
        /// <summary>0x012, Volume allocation blocks</summary>
        public ushort drNmAlBlks;
        /// <summary>0x014, Size of allocation blocks</summary>
        public uint drAlBlkSiz;
        /// <summary>0x018, Number of bytes to allocate</summary>
        public uint drClpSiz;
        /// <summary>0x01C, First allocation block in block map</summary>
        public ushort drAlBlSt;
        /// <summary>0x01E. Next unused file number</summary>
        public uint drNxtFNum;
        /// <summary>0x022, Number of unused allocation blocks</summary>
        public ushort drFreeBks;
        /// <summary>0x024, Length of volume name</summary>
        public byte drVNSiz;
        /// <summary>0x025, Characters of volume name</summary>
        public string drVN;
    }

#endregion
}