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310 lines
11 KiB
C#
310 lines
11 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 : MINIX filesystem plugin.
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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 Partition = Aaru.CommonTypes.Partition;
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namespace Aaru.Filesystems;
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// Information from the Linux kernel
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/// <inheritdoc />
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/// <summary>Implements detection of the MINIX filesystem</summary>
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public sealed partial class MinixFS
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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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uint sector = 2;
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uint offset = 0;
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if(imagePlugin.Info.MetadataMediaType == MetadataMediaType.OpticalDisc)
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{
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sector = 0;
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offset = 0x400;
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}
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if(sector + partition.Start >= partition.End) return false;
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ErrorNumber errno = imagePlugin.ReadSector(sector + partition.Start, false, out byte[] minixSbSector, out _);
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if(errno != ErrorNumber.NoError) return false;
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// Optical media
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if(offset > 0)
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{
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var tmp = new byte[0x200];
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Array.Copy(minixSbSector, offset, tmp, 0, 0x200);
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minixSbSector = tmp;
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}
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var magic = BitConverter.ToUInt16(minixSbSector, 0x010);
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if(magic is MINIX_MAGIC
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or MINIX_MAGIC2
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or MINIX2_MAGIC
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or MINIX2_MAGIC2
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or MINIX_CIGAM
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or MINIX_CIGAM2
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or MINIX2_CIGAM
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or MINIX2_CIGAM2)
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return true;
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magic = BitConverter.ToUInt16(minixSbSector, 0x018); // Here should reside magic number on Minix v3
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return magic is MINIX_MAGIC or MINIX2_MAGIC or MINIX3_MAGIC or MINIX_CIGAM or MINIX2_CIGAM or MINIX3_CIGAM;
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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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information = "";
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metadata = new FileSystem();
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var sb = new StringBuilder();
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uint sector = 2;
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uint offset = 0;
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if(imagePlugin.Info.MetadataMediaType == MetadataMediaType.OpticalDisc)
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{
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sector = 0;
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offset = 0x400;
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}
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var minix3 = false;
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int filenamesize;
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string minixVersion;
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ErrorNumber errno = imagePlugin.ReadSector(sector + partition.Start, false, out byte[] minixSbSector, out _);
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if(errno != ErrorNumber.NoError) return;
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// Optical media
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if(offset > 0)
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{
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var tmp = new byte[0x200];
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Array.Copy(minixSbSector, offset, tmp, 0, 0x200);
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minixSbSector = tmp;
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}
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var magic = BitConverter.ToUInt16(minixSbSector, 0x018);
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metadata = new FileSystem();
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bool littleEndian;
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if(magic is MINIX3_MAGIC or MINIX3_CIGAM or MINIX2_MAGIC or MINIX2_CIGAM or MINIX_MAGIC or MINIX_CIGAM)
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{
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filenamesize = 60;
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littleEndian = magic is not (MINIX3_CIGAM or MINIX2_CIGAM or MINIX_CIGAM);
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switch(magic)
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{
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case MINIX3_MAGIC:
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case MINIX3_CIGAM:
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minixVersion = Localization.Minix_v3_filesystem;
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metadata.Type = FS_TYPE_V3;
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break;
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case MINIX2_MAGIC:
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case MINIX2_CIGAM:
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minixVersion = Localization.Minix_3_v2_filesystem;
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metadata.Type = FS_TYPE_V3;
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break;
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default:
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minixVersion = Localization.Minix_3_v1_filesystem;
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metadata.Type = FS_TYPE_V3;
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break;
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}
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minix3 = true;
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}
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else
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{
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magic = BitConverter.ToUInt16(minixSbSector, 0x010);
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switch(magic)
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{
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case MINIX_MAGIC:
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filenamesize = 14;
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minixVersion = Localization.Minix_v1_filesystem;
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littleEndian = true;
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metadata.Type = FS_TYPE_V1;
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break;
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case MINIX_MAGIC2:
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filenamesize = 30;
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minixVersion = Localization.Minix_v1_filesystem;
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littleEndian = true;
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metadata.Type = FS_TYPE_V1;
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break;
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case MINIX2_MAGIC:
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filenamesize = 14;
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minixVersion = Localization.Minix_v2_filesystem;
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littleEndian = true;
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metadata.Type = FS_TYPE_V2;
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break;
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case MINIX2_MAGIC2:
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filenamesize = 30;
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minixVersion = Localization.Minix_v2_filesystem;
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littleEndian = true;
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metadata.Type = FS_TYPE_V2;
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break;
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case MINIX_CIGAM:
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filenamesize = 14;
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minixVersion = Localization.Minix_v1_filesystem;
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littleEndian = false;
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metadata.Type = FS_TYPE_V1;
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break;
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case MINIX_CIGAM2:
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filenamesize = 30;
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minixVersion = Localization.Minix_v1_filesystem;
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littleEndian = false;
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metadata.Type = FS_TYPE_V1;
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break;
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case MINIX2_CIGAM:
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filenamesize = 14;
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minixVersion = Localization.Minix_v2_filesystem;
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littleEndian = false;
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metadata.Type = FS_TYPE_V2;
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break;
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case MINIX2_CIGAM2:
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filenamesize = 30;
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minixVersion = Localization.Minix_v2_filesystem;
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littleEndian = false;
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metadata.Type = FS_TYPE_V2;
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break;
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default:
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return;
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}
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}
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if(minix3)
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{
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SuperBlock3 mnxSb = littleEndian
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? Marshal.ByteArrayToStructureLittleEndian<SuperBlock3>(minixSbSector)
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: Marshal.ByteArrayToStructureBigEndian<SuperBlock3>(minixSbSector);
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if(magic != MINIX3_MAGIC && magic != MINIX3_CIGAM) mnxSb.s_blocksize = 1024;
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sb.AppendLine(minixVersion);
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sb.AppendFormat(Localization._0_chars_in_filename, filenamesize).AppendLine();
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if(mnxSb.s_zones > 0) // On V2
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{
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sb.AppendFormat(Localization._0_zones_in_volume_1_bytes, mnxSb.s_zones, mnxSb.s_zones * 1024)
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.AppendLine();
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}
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else
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{
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sb.AppendFormat(Localization._0_zones_in_volume_1_bytes, mnxSb.s_nzones, mnxSb.s_nzones * 1024)
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.AppendLine();
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}
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sb.AppendFormat(Localization._0_bytes_block, mnxSb.s_blocksize).AppendLine();
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sb.AppendFormat(Localization._0_inodes_in_volume, mnxSb.s_ninodes).AppendLine();
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sb.AppendFormat(Localization._0_blocks_on_inode_map_1_bytes,
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mnxSb.s_imap_blocks,
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mnxSb.s_imap_blocks * mnxSb.s_blocksize)
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.AppendLine();
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sb.AppendFormat(Localization._0_blocks_on_zone_map_1_bytes,
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mnxSb.s_zmap_blocks,
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mnxSb.s_zmap_blocks * mnxSb.s_blocksize)
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.AppendLine();
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sb.AppendFormat(Localization.First_data_zone_0, mnxSb.s_firstdatazone).AppendLine();
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//sb.AppendFormat("log2 of blocks/zone: {0}", mnx_sb.s_log_zone_size).AppendLine(); // Apparently 0
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sb.AppendFormat(Localization._0_bytes_maximum_per_file, mnxSb.s_max_size).AppendLine();
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sb.AppendFormat(Localization.On_disk_filesystem_version_0, mnxSb.s_disk_version).AppendLine();
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metadata.ClusterSize = mnxSb.s_blocksize;
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metadata.Clusters = mnxSb.s_zones > 0 ? mnxSb.s_zones : mnxSb.s_nzones;
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}
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else
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{
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SuperBlock mnxSb = littleEndian
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? Marshal.ByteArrayToStructureLittleEndian<SuperBlock>(minixSbSector)
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: Marshal.ByteArrayToStructureBigEndian<SuperBlock>(minixSbSector);
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sb.AppendLine(minixVersion);
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sb.AppendFormat(Localization._0_chars_in_filename, filenamesize).AppendLine();
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if(mnxSb.s_zones > 0) // On V2
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{
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sb.AppendFormat(Localization._0_zones_in_volume_1_bytes, mnxSb.s_zones, mnxSb.s_zones * 1024)
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.AppendLine();
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}
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else
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{
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sb.AppendFormat(Localization._0_zones_in_volume_1_bytes, mnxSb.s_nzones, mnxSb.s_nzones * 1024)
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.AppendLine();
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}
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sb.AppendFormat(Localization._0_inodes_in_volume, mnxSb.s_ninodes).AppendLine();
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sb.AppendFormat(Localization._0_blocks_on_inode_map_1_bytes,
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mnxSb.s_imap_blocks,
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mnxSb.s_imap_blocks * 1024)
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.AppendLine();
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sb.AppendFormat(Localization._0_blocks_on_zone_map_1_bytes, mnxSb.s_zmap_blocks, mnxSb.s_zmap_blocks * 1024)
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.AppendLine();
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sb.AppendFormat(Localization.First_data_zone_0, mnxSb.s_firstdatazone).AppendLine();
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//sb.AppendFormat("log2 of blocks/zone: {0}", mnx_sb.s_log_zone_size).AppendLine(); // Apparently 0
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sb.AppendFormat(Localization._0_bytes_maximum_per_file, mnxSb.s_max_size).AppendLine();
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sb.AppendFormat(Localization.Filesystem_state_0, mnxSb.s_state).AppendLine();
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metadata.ClusterSize = 1024;
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metadata.Clusters = mnxSb.s_zones > 0 ? mnxSb.s_zones : mnxSb.s_nzones;
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}
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information = sb.ToString();
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}
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#endregion
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} |