Reorganize filesystems.

Aaru.Filesystems/RT11/Info.cs

@@ -0,0 +1,124 @@
+// /***************************************************************************
+// Aaru Data Preservation Suite
+// ----------------------------------------------------------------------------
+//
+// Filename       : Info.cs
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//
+// Component      : RT-11 file system plugin.
+//
+// --[ Description ] ----------------------------------------------------------
+//
+//     Identifies the RT-11 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 © 2011-2023 Natalia Portillo
+// ****************************************************************************/
+
+using System;
+using System.Text;
+using Aaru.CommonTypes;
+using Aaru.CommonTypes.Enums;
+using Aaru.CommonTypes.Interfaces;
+using Aaru.Helpers;
+using Claunia.Encoding;
+using Schemas;
+using Encoding = System.Text.Encoding;
+
+namespace Aaru.Filesystems;
+
+// Information from http://www.trailing-edge.com/~shoppa/rt11fs/
+/// <inheritdoc />
+/// <summary>Implements detection of the DEC RT-11 filesystem</summary>
+public sealed partial class RT11
+{
+    /// <inheritdoc />
+    public bool Identify(IMediaImage imagePlugin, Partition partition)
+    {
+        if(1 + partition.Start >= partition.End)
+            return false;
+
+        byte[]      magicB = new byte[12];
+        ErrorNumber errno  = imagePlugin.ReadSector(1 + partition.Start, out byte[] hbSector);
+
+        if(errno != ErrorNumber.NoError)
+            return false;
+
+        if(hbSector.Length < 512)
+            return false;
+
+        Array.Copy(hbSector, 0x1F0, magicB, 0, 12);
+        string magic = Encoding.ASCII.GetString(magicB);
+
+        return magic == "DECRT11A    ";
+    }
+
+    /// <inheritdoc />
+    public void GetInformation(IMediaImage imagePlugin, Partition partition, out string information, Encoding encoding)
+    {
+        Encoding    = new Radix50();
+        information = "";
+
+        var sb = new StringBuilder();
+
+        ErrorNumber errno = imagePlugin.ReadSector(1 + partition.Start, out byte[] hbSector);
+
+        if(errno != ErrorNumber.NoError)
+            return;
+
+        HomeBlock homeblock = Marshal.ByteArrayToStructureLittleEndian<HomeBlock>(hbSector);
+
+        /* TODO: Is this correct?
+         * Assembler:
+         *      MOV address, R0
+         *      CLR R1
+         *      MOV #255., R2
+         * 10$: ADD (R0)+, R1
+         *      SOB R2, 10$
+         *      MOV 1,@R0
+         */
+        ushort check = 0;
+
+        for(int i = 0; i < 512; i += 2)
+            check += BitConverter.ToUInt16(hbSector, i);
+
+        sb.AppendFormat(Localization.Volume_format_is_0,
+                        StringHandlers.SpacePaddedToString(homeblock.format, Encoding.ASCII)).AppendLine();
+
+        sb.AppendFormat(Localization._0_sectors_per_cluster_1_bytes, homeblock.cluster, homeblock.cluster * 512).
+           AppendLine();
+
+        sb.AppendFormat(Localization.First_directory_segment_starts_at_block_0, homeblock.rootBlock).AppendLine();
+        sb.AppendFormat(Localization.Volume_owner_is_0, Encoding.GetString(homeblock.ownername).TrimEnd()).AppendLine();
+        sb.AppendFormat(Localization.Volume_label_0, Encoding.GetString(homeblock.volname).TrimEnd()).AppendLine();
+        sb.AppendFormat(Localization.Checksum_0_calculated_1, homeblock.checksum, check).AppendLine();
+
+        imagePlugin.ReadSector(0, out byte[] bootBlock);
+
+        XmlFsType = new FileSystemType
+        {
+            Type        = FS_TYPE,
+            ClusterSize = (uint)(homeblock.cluster * 512),
+            Clusters    = homeblock.cluster,
+            VolumeName  = StringHandlers.SpacePaddedToString(homeblock.volname, Encoding),
+            Bootable    = !ArrayHelpers.ArrayIsNullOrEmpty(bootBlock)
+        };
+
+        information = sb.ToString();
+    }
+}