Reorganize filesystems.

Aaru.Filesystems/MicroDOS/Structs.cs

@@ -0,0 +1,95 @@
+// /***************************************************************************
+// Aaru Data Preservation Suite
+// ----------------------------------------------------------------------------
+//
+// Filename       : Structs.cs
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//
+// Component      : MicroDOS filesystem 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 © 2011-2023 Natalia Portillo
+// ****************************************************************************/
+
+// ReSharper disable UnusedType.Local
+// ReSharper disable UnusedMember.Local
+
+using System.Runtime.InteropServices;
+
+namespace Aaru.Filesystems;
+
+/// <inheritdoc />
+/// <summary>
+///     Implements detection for the MicroDOS filesystem. Information from http://www.owg.ru/mkt/BK/MKDOS.TXT Thanks
+///     to tarlabnor for translating it
+/// </summary>
+public sealed partial class MicroDOS
+{
+    // Followed by directory entries
+    [StructLayout(LayoutKind.Sequential, Pack = 1)]
+    readonly struct Block0
+    {
+        /// <summary>BK starts booting here</summary>
+        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 24)]
+        public readonly byte[] bootCode;
+        /// <summary>Number of files in directory</summary>
+        public readonly ushort files;
+        /// <summary>Total number of blocks in files of the directory</summary>
+        public readonly ushort usedBlocks;
+        /// <summary>Unknown</summary>
+        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 228)]
+        public readonly byte[] unknown;
+        /// <summary>Ownership label (label that shows it belongs to Micro DOS format)</summary>
+        public readonly ushort label;
+        /// <summary>MK-DOS directory format label</summary>
+        public readonly ushort mklabel;
+        /// <summary>Unknown</summary>
+        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
+        public readonly byte[] unknown2;
+        /// <summary>
+        ///     Disk size in blocks (absolute value for the system unlike NORD, NORTON etc.) that doesn't use two fixed values
+        ///     40 or 80 tracks, but i.e. if you drive works with 76 tracks this field will contain an appropriate number of blocks
+        /// </summary>
+        public readonly ushort blocks;
+        /// <summary> Number of the first file's block. Value is changable</summary>
+        public readonly ushort firstUsedBlock;
+        /// <summary>Unknown</summary>
+        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]
+        public readonly byte[] unknown3;
+    }
+
+    [StructLayout(LayoutKind.Sequential, Pack = 1)]
+    readonly struct DirectoryEntry
+    {
+        /// <summary>File status</summary>
+        public readonly byte status;
+        /// <summary>Directory number (0 - root)</summary>
+        public readonly byte directory;
+        /// <summary>File name 14. symbols in ASCII KOI8</summary>
+        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
+        public readonly byte[] filename;
+        /// <summary>Block number</summary>
+        public readonly ushort blockNo;
+        /// <summary>Length in blocks</summary>
+        public readonly ushort blocks;
+        /// <summary>Address</summary>
+        public readonly ushort address;
+        /// <summary>Length</summary>
+        public readonly ushort length;
+    }
+}