mirror of
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284 lines
12 KiB
C#
284 lines
12 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 : Files-11 On-Disk Structure plugin.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies the Files-11 On-Disk Structure 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 Aaru.Logging;
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using Partition = Aaru.CommonTypes.Partition;
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namespace Aaru.Filesystems;
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// Information from VMS File System Internals by Kirby McCoy
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// ISBN: 1-55558-056-4
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// With some hints from http://www.decuslib.com/DECUS/vmslt97b/gnusoftware/gccaxp/7_1/vms/hm2def.h
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// Expects the home block to be always in sector #1 (does not check deltas)
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// Assumes a sector size of 512 bytes (VMS does on HDDs and optical drives, dunno about M.O.)
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// Book only describes ODS-2. Need to test ODS-1 and ODS-5
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// There is an ODS with signature "DECFILES11A", yet to be seen
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// Time is a 64 bit unsigned integer, tenths of microseconds since 1858/11/17 00:00:00.
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// TODO: Implement checksum
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/// <inheritdoc />
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/// <summary>Implements detection of DEC's On-Disk Structure, aka the ODS filesystem</summary>
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public sealed partial class ODS
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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(2 + partition.Start >= partition.End) return false;
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if(imagePlugin.Info.SectorSize < 512) 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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Array.Copy(hbSector, 0x1F0, magicB, 0, 12);
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string magic = Encoding.ASCII.GetString(magicB);
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AaruLogging.Debug(MODULE_NAME, Localization.magic_0, magic);
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if(magic is "DECFILE11A " or "DECFILE11B ") return true;
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// Optical disc
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if(imagePlugin.Info.MetadataMediaType != MetadataMediaType.OpticalDisc) return false;
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if(hbSector.Length < 0x400) return false;
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errno = imagePlugin.ReadSector(partition.Start, false, out hbSector, out _);
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if(errno != ErrorNumber.NoError) return false;
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Array.Copy(hbSector, 0x3F0, magicB, 0, 12);
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magic = Encoding.ASCII.GetString(magicB);
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AaruLogging.Debug(MODULE_NAME, Localization.unaligned_magic_0, magic);
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return magic is "DECFILE11A " or "DECFILE11B ";
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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 ??= Encoding.GetEncoding("iso-8859-1");
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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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// Optical disc
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if(imagePlugin.Info.MetadataMediaType == MetadataMediaType.OpticalDisc &&
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StringHandlers.CToString(homeblock.format) != "DECFILE11A " &&
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StringHandlers.CToString(homeblock.format) != "DECFILE11B ")
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{
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if(hbSector.Length < 0x400) return;
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errno = imagePlugin.ReadSector(partition.Start, false, out byte[] tmp, out _);
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if(errno != ErrorNumber.NoError) return;
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hbSector = new byte[0x200];
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Array.Copy(tmp, 0x200, hbSector, 0, 0x200);
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homeblock = Marshal.ByteArrayToStructureLittleEndian<HomeBlock>(hbSector);
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if(StringHandlers.CToString(homeblock.format) != "DECFILE11A " &&
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StringHandlers.CToString(homeblock.format) != "DECFILE11B ")
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return;
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}
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if((homeblock.struclev & 0xFF00) != 0x0200 ||
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(homeblock.struclev & 0xFF) != 1 ||
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StringHandlers.CToString(homeblock.format) != "DECFILE11B ")
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sb.AppendLine(Localization.The_following_information_may_be_incorrect_for_this_volume);
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if(homeblock.resfiles < 5 || homeblock.devtype != 0) sb.AppendLine(Localization.This_volume_may_be_corrupted);
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sb.AppendFormat(Localization.Volume_format_is_0, StringHandlers.SpacePaddedToString(homeblock.format, encoding))
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.AppendLine();
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sb.AppendFormat(Localization.Volume_is_Level_0_revision_1,
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(homeblock.struclev & 0xFF00) >> 8,
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homeblock.struclev & 0xFF)
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.AppendLine();
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sb.AppendFormat(Localization.Lowest_structure_in_the_volume_is_Level_0_revision_1,
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(homeblock.lowstruclev & 0xFF00) >> 8,
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homeblock.lowstruclev & 0xFF)
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.AppendLine();
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sb.AppendFormat(Localization.Highest_structure_in_the_volume_is_Level_0_revision_1,
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(homeblock.highstruclev & 0xFF00) >> 8,
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homeblock.highstruclev & 0xFF)
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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.This_home_block_is_on_sector_0_VBN_1, homeblock.homelbn, homeblock.homevbn)
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.AppendLine();
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sb.AppendFormat(Localization.Secondary_home_block_is_on_sector_0_VBN_1,
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homeblock.alhomelbn,
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homeblock.alhomevbn)
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.AppendLine();
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sb.AppendFormat(Localization.Volume_bitmap_starts_in_sector_0_VBN_1, homeblock.ibmaplbn, homeblock.ibmapvbn)
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.AppendLine();
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sb.AppendFormat(Localization.Volume_bitmap_runs_for_0_sectors_1_bytes,
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homeblock.ibmapsize,
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homeblock.ibmapsize * 512)
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.AppendLine();
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sb.AppendFormat(Localization.Backup_INDEXF_SYS_is_in_sector_0_VBN_1, homeblock.altidxlbn, homeblock.altidxvbn)
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.AppendLine();
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sb.AppendFormat(Localization._0_maximum_files_on_the_volume, homeblock.maxfiles).AppendLine();
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sb.AppendFormat(Localization._0_reserved_files, homeblock.resfiles).AppendLine();
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if(homeblock is { rvn: > 0, setcount: > 0 } && StringHandlers.CToString(homeblock.strucname) != " ")
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{
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sb.AppendFormat(Localization.Volume_is_0_of_1_in_set_2,
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homeblock.rvn,
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homeblock.setcount,
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StringHandlers.SpacePaddedToString(homeblock.strucname, encoding))
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.AppendLine();
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}
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sb.AppendFormat(Localization.Volume_owner_is_0_ID_1,
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StringHandlers.SpacePaddedToString(homeblock.ownername, encoding),
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homeblock.volowner)
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.AppendLine();
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sb.AppendFormat(Localization.Volume_label_0, StringHandlers.SpacePaddedToString(homeblock.volname, encoding))
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.AppendLine();
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sb.AppendFormat(Localization.Drive_serial_number_0, homeblock.serialnum).AppendLine();
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sb.AppendFormat(Localization.Volume_was_created_on_0, DateHandlers.VmsToDateTime(homeblock.credate))
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.AppendLine();
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if(homeblock.revdate > 0)
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{
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sb.AppendFormat(Localization.Volume_was_last_modified_on_0, DateHandlers.VmsToDateTime(homeblock.revdate))
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.AppendLine();
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}
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if(homeblock.copydate > 0)
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{
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sb.AppendFormat(Localization.Volume_copied_on_0, DateHandlers.VmsToDateTime(homeblock.copydate))
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.AppendLine();
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}
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sb.AppendFormat(Localization.Checksums_0_and_1, homeblock.checksum1, homeblock.checksum2).AppendLine();
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sb.AppendLine(Localization.Flags);
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sb.AppendFormat(Localization.Window_0, homeblock.window).AppendLine();
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sb.AppendFormat(Localization.Cached_directories_0, homeblock.lru_lim).AppendLine();
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sb.AppendFormat(Localization.Default_allocation_0_blocks, homeblock.extend).AppendLine();
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if((homeblock.volchar & 0x01) == 0x01) sb.AppendLine(Localization.Readings_should_be_verified);
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if((homeblock.volchar & 0x02) == 0x02) sb.AppendLine(Localization.Writings_should_be_verified);
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if((homeblock.volchar & 0x04) == 0x04)
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sb.AppendLine(Localization.Files_should_be_erased_or_overwritten_when_deleted);
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if((homeblock.volchar & 0x08) == 0x08) sb.AppendLine(Localization.Highwater_mark_is_to_be_disabled);
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if((homeblock.volchar & 0x10) == 0x10) sb.AppendLine(Localization.Classification_checks_are_enabled);
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sb.AppendLine(Localization.Volume_permissions_r_read_w_write_c_create_d_delete);
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sb.AppendLine(Localization.System_owner_group_world);
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// System
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sb.Append((homeblock.protect & 0x1000) == 0x1000 ? "-" : "r");
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sb.Append((homeblock.protect & 0x2000) == 0x2000 ? "-" : "w");
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sb.Append((homeblock.protect & 0x4000) == 0x4000 ? "-" : "c");
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sb.Append((homeblock.protect & 0x8000) == 0x8000 ? "-" : "d");
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// Owner
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sb.Append((homeblock.protect & 0x100) == 0x100 ? "-" : "r");
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sb.Append((homeblock.protect & 0x200) == 0x200 ? "-" : "w");
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sb.Append((homeblock.protect & 0x400) == 0x400 ? "-" : "c");
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sb.Append((homeblock.protect & 0x800) == 0x800 ? "-" : "d");
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// Group
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sb.Append((homeblock.protect & 0x10) == 0x10 ? "-" : "r");
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sb.Append((homeblock.protect & 0x20) == 0x20 ? "-" : "w");
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sb.Append((homeblock.protect & 0x40) == 0x40 ? "-" : "c");
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sb.Append((homeblock.protect & 0x80) == 0x80 ? "-" : "d");
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// World (other)
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sb.Append((homeblock.protect & 0x1) == 0x1 ? "-" : "r");
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sb.Append((homeblock.protect & 0x2) == 0x2 ? "-" : "w");
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sb.Append((homeblock.protect & 0x4) == 0x4 ? "-" : "c");
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sb.Append((homeblock.protect & 0x8) == 0x8 ? "-" : "d");
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sb.AppendLine();
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sb.AppendLine(Localization.Unknown_structures);
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sb.AppendFormat(Localization.Security_mask_0, homeblock.sec_mask).AppendLine();
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sb.AppendFormat(Localization.File_protection_0, homeblock.fileprot).AppendLine();
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sb.AppendFormat(Localization.Record_protection_0, homeblock.recprot).AppendLine();
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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 = partition.Size / (ulong)(homeblock.cluster * 512),
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VolumeName = StringHandlers.SpacePaddedToString(homeblock.volname, encoding),
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VolumeSerial = $"{homeblock.serialnum:X8}"
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};
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if(homeblock.credate > 0) metadata.CreationDate = DateHandlers.VmsToDateTime(homeblock.credate);
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if(homeblock.revdate > 0) metadata.ModificationDate = DateHandlers.VmsToDateTime(homeblock.revdate);
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information = sb.ToString();
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}
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#endregion
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} |