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126 lines
4.7 KiB
C#
126 lines
4.7 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : Info.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : RT-11 file system plugin.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies the RT-11 file system and shows information.
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//
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// --[ License ] --------------------------------------------------------------
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2011-2025 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.Text;
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using Aaru.CommonTypes.AaruMetadata;
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using Aaru.CommonTypes.Enums;
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using Aaru.CommonTypes.Interfaces;
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using Aaru.Helpers;
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using Claunia.Encoding;
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using Encoding = System.Text.Encoding;
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using Partition = Aaru.CommonTypes.Partition;
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namespace Aaru.Filesystems;
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// Information from http://www.trailing-edge.com/~shoppa/rt11fs/
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/// <inheritdoc />
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/// <summary>Implements detection of the DEC RT-11 filesystem</summary>
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public sealed partial class RT11
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{
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#region IFilesystem Members
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/// <inheritdoc />
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public bool Identify(IMediaImage imagePlugin, Partition partition)
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{
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if(1 + partition.Start >= partition.End) return false;
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var magicB = new byte[12];
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ErrorNumber errno = imagePlugin.ReadSector(1 + partition.Start, false, out byte[] hbSector, out _);
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if(errno != ErrorNumber.NoError) return false;
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if(hbSector.Length < 512) return false;
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Array.Copy(hbSector, 0x1F0, magicB, 0, 12);
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string magic = Encoding.ASCII.GetString(magicB);
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return magic == "DECRT11A ";
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}
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/// <inheritdoc />
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public void GetInformation(IMediaImage imagePlugin, Partition partition, Encoding encoding, out string information,
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out FileSystem metadata)
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{
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encoding = new Radix50();
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information = "";
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metadata = new FileSystem();
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var sb = new StringBuilder();
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ErrorNumber errno = imagePlugin.ReadSector(1 + partition.Start, false, out byte[] hbSector, out _);
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if(errno != ErrorNumber.NoError) return;
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HomeBlock homeblock = Marshal.ByteArrayToStructureLittleEndian<HomeBlock>(hbSector);
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/* TODO: Is this correct?
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* Assembler:
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* MOV address, R0
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* CLR R1
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* MOV #255., R2
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* 10$: ADD (R0)+, R1
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* SOB R2, 10$
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* MOV 1,@R0
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*/
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ushort check = 0;
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for(var i = 0; i < 512; i += 2) check += BitConverter.ToUInt16(hbSector, i);
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sb.AppendFormat(Localization.Volume_format_is_0,
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StringHandlers.SpacePaddedToString(homeblock.format, Encoding.ASCII))
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.AppendLine();
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sb.AppendFormat(Localization._0_sectors_per_cluster_1_bytes, homeblock.cluster, homeblock.cluster * 512)
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.AppendLine();
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sb.AppendFormat(Localization.First_directory_segment_starts_at_block_0, homeblock.rootBlock).AppendLine();
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sb.AppendFormat(Localization.Volume_owner_is_0, encoding.GetString(homeblock.ownername).TrimEnd()).AppendLine();
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sb.AppendFormat(Localization.Volume_label_0, encoding.GetString(homeblock.volname).TrimEnd()).AppendLine();
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sb.AppendFormat(Localization.Checksum_0_calculated_1, homeblock.checksum, check).AppendLine();
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imagePlugin.ReadSector(0, false, out byte[] bootBlock, out _);
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metadata = new FileSystem
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{
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Type = FS_TYPE,
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ClusterSize = (uint)(homeblock.cluster * 512),
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Clusters = homeblock.cluster,
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VolumeName = StringHandlers.SpacePaddedToString(homeblock.volname, encoding),
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Bootable = !ArrayHelpers.ArrayIsNullOrEmpty(bootBlock)
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};
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information = sb.ToString();
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}
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#endregion
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} |