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282 lines
12 KiB
C#
282 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 : EFS.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Extent File System plugin
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies the Extent 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 © 2011-2021 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.Diagnostics.CodeAnalysis;
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using System.Runtime.InteropServices;
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using System.Text;
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using Aaru.CommonTypes;
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using Aaru.CommonTypes.Enums;
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using Aaru.CommonTypes.Interfaces;
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using Aaru.Console;
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using Aaru.Helpers;
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using Schemas;
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using Marshal = Aaru.Helpers.Marshal;
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namespace Aaru.Filesystems
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{
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/// <inheritdoc />
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/// <summary>
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/// Implements identification for the SGI Extent FileSystem
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/// </summary>
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public sealed class EFS : IFilesystem
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{
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const uint EFS_MAGIC = 0x00072959;
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const uint EFS_MAGIC_NEW = 0x0007295A;
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/// <inheritdoc />
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public FileSystemType XmlFsType { get; private set; }
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/// <inheritdoc />
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public Encoding Encoding { get; private set; }
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/// <inheritdoc />
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public string Name => "Extent File System Plugin";
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/// <inheritdoc />
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public Guid Id => new Guid("52A43F90-9AF3-4391-ADFE-65598DEEABAB");
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/// <inheritdoc />
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public string Author => "Natalia Portillo";
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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(imagePlugin.Info.SectorSize < 512)
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return false;
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// Misaligned
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if(imagePlugin.Info.XmlMediaType == XmlMediaType.OpticalDisc)
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{
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uint sbSize = (uint)((Marshal.SizeOf<Superblock>() + 0x200) / imagePlugin.Info.SectorSize);
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if((Marshal.SizeOf<Superblock>() + 0x200) % imagePlugin.Info.SectorSize != 0)
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sbSize++;
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byte[] sector = imagePlugin.ReadSectors(partition.Start, sbSize);
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if(sector.Length < Marshal.SizeOf<Superblock>())
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return false;
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byte[] sbpiece = new byte[Marshal.SizeOf<Superblock>()];
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Array.Copy(sector, 0x200, sbpiece, 0, Marshal.SizeOf<Superblock>());
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Superblock sb = Marshal.ByteArrayToStructureBigEndian<Superblock>(sbpiece);
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AaruConsole.DebugWriteLine("EFS plugin", "magic at 0x{0:X3} = 0x{1:X8} (expected 0x{2:X8} or 0x{3:X8})",
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0x200, sb.sb_magic, EFS_MAGIC, EFS_MAGIC_NEW);
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if(sb.sb_magic == EFS_MAGIC ||
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sb.sb_magic == EFS_MAGIC_NEW)
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return true;
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}
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else
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{
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uint sbSize = (uint)(Marshal.SizeOf<Superblock>() / imagePlugin.Info.SectorSize);
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if(Marshal.SizeOf<Superblock>() % imagePlugin.Info.SectorSize != 0)
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sbSize++;
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byte[] sector = imagePlugin.ReadSectors(partition.Start + 1, sbSize);
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if(sector.Length < Marshal.SizeOf<Superblock>())
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return false;
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Superblock sb = Marshal.ByteArrayToStructureBigEndian<Superblock>(sector);
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AaruConsole.DebugWriteLine("EFS plugin", "magic at {0} = 0x{1:X8} (expected 0x{2:X8} or 0x{3:X8})", 1,
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sb.sb_magic, EFS_MAGIC, EFS_MAGIC_NEW);
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if(sb.sb_magic == EFS_MAGIC ||
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sb.sb_magic == EFS_MAGIC_NEW)
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return true;
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}
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return false;
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}
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/// <inheritdoc />
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public void GetInformation(IMediaImage imagePlugin, Partition partition, out string information,
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Encoding encoding)
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{
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Encoding = encoding ?? Encoding.GetEncoding("iso-8859-15");
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information = "";
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if(imagePlugin.Info.SectorSize < 512)
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return;
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Superblock efsSb;
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// Misaligned
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if(imagePlugin.Info.XmlMediaType == XmlMediaType.OpticalDisc)
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{
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uint sbSize = (uint)((Marshal.SizeOf<Superblock>() + 0x400) / imagePlugin.Info.SectorSize);
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if((Marshal.SizeOf<Superblock>() + 0x400) % imagePlugin.Info.SectorSize != 0)
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sbSize++;
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byte[] sector = imagePlugin.ReadSectors(partition.Start, sbSize);
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if(sector.Length < Marshal.SizeOf<Superblock>())
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return;
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byte[] sbpiece = new byte[Marshal.SizeOf<Superblock>()];
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Array.Copy(sector, 0x200, sbpiece, 0, Marshal.SizeOf<Superblock>());
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efsSb = Marshal.ByteArrayToStructureBigEndian<Superblock>(sbpiece);
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AaruConsole.DebugWriteLine("EFS plugin", "magic at 0x{0:X3} = 0x{1:X8} (expected 0x{2:X8} or 0x{3:X8})",
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0x200, efsSb.sb_magic, EFS_MAGIC, EFS_MAGIC_NEW);
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}
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else
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{
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uint sbSize = (uint)(Marshal.SizeOf<Superblock>() / imagePlugin.Info.SectorSize);
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if(Marshal.SizeOf<Superblock>() % imagePlugin.Info.SectorSize != 0)
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sbSize++;
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byte[] sector = imagePlugin.ReadSectors(partition.Start + 1, sbSize);
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if(sector.Length < Marshal.SizeOf<Superblock>())
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return;
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efsSb = Marshal.ByteArrayToStructureBigEndian<Superblock>(sector);
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AaruConsole.DebugWriteLine("EFS plugin", "magic at {0} = 0x{1:X8} (expected 0x{2:X8} or 0x{3:X8})", 1,
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efsSb.sb_magic, EFS_MAGIC, EFS_MAGIC_NEW);
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}
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if(efsSb.sb_magic != EFS_MAGIC &&
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efsSb.sb_magic != EFS_MAGIC_NEW)
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return;
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var sb = new StringBuilder();
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sb.AppendLine("SGI extent filesystem");
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if(efsSb.sb_magic == EFS_MAGIC_NEW)
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sb.AppendLine("New version");
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sb.AppendFormat("Filesystem size: {0} basic blocks", efsSb.sb_size).AppendLine();
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sb.AppendFormat("First cylinder group starts at block {0}", efsSb.sb_firstcg).AppendLine();
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sb.AppendFormat("Cylinder group size: {0} basic blocks", efsSb.sb_cgfsize).AppendLine();
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sb.AppendFormat("{0} inodes per cylinder group", efsSb.sb_cgisize).AppendLine();
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sb.AppendFormat("{0} sectors per track", efsSb.sb_sectors).AppendLine();
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sb.AppendFormat("{0} heads per cylinder", efsSb.sb_heads).AppendLine();
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sb.AppendFormat("{0} cylinder groups", efsSb.sb_ncg).AppendLine();
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sb.AppendFormat("Volume created on {0}", DateHandlers.UnixToDateTime(efsSb.sb_time)).AppendLine();
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sb.AppendFormat("{0} bytes on bitmap", efsSb.sb_bmsize).AppendLine();
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sb.AppendFormat("{0} free blocks", efsSb.sb_tfree).AppendLine();
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sb.AppendFormat("{0} free inodes", efsSb.sb_tinode).AppendLine();
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if(efsSb.sb_bmblock > 0)
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sb.AppendFormat("Bitmap resides at block {0}", efsSb.sb_bmblock).AppendLine();
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if(efsSb.sb_replsb > 0)
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sb.AppendFormat("Replacement superblock resides at block {0}", efsSb.sb_replsb).AppendLine();
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if(efsSb.sb_lastinode > 0)
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sb.AppendFormat("Last inode allocated: {0}", efsSb.sb_lastinode).AppendLine();
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if(efsSb.sb_dirty > 0)
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sb.AppendLine("Volume is dirty");
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sb.AppendFormat("Checksum: 0x{0:X8}", efsSb.sb_checksum).AppendLine();
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sb.AppendFormat("Volume name: {0}", StringHandlers.CToString(efsSb.sb_fname, Encoding)).AppendLine();
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sb.AppendFormat("Volume pack: {0}", StringHandlers.CToString(efsSb.sb_fpack, Encoding)).AppendLine();
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information = sb.ToString();
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XmlFsType = new FileSystemType
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{
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Type = "Extent File System",
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ClusterSize = 512,
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Clusters = (ulong)efsSb.sb_size,
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FreeClusters = (ulong)efsSb.sb_tfree,
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FreeClustersSpecified = true,
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Dirty = efsSb.sb_dirty > 0,
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VolumeName = StringHandlers.CToString(efsSb.sb_fname, Encoding),
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VolumeSerial = $"{efsSb.sb_checksum:X8}",
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CreationDate = DateHandlers.UnixToDateTime(efsSb.sb_time),
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CreationDateSpecified = true
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};
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1), SuppressMessage("ReSharper", "InconsistentNaming")]
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readonly struct Superblock
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{
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/* 0: fs size incl. bb 0 (in bb) */
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public readonly int sb_size;
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/* 4: first cg offset (in bb) */
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public readonly int sb_firstcg;
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/* 8: cg size (in bb) */
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public readonly int sb_cgfsize;
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/* 12: inodes/cg (in bb) */
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public readonly short sb_cgisize;
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/* 14: geom: sectors/track */
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public readonly short sb_sectors;
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/* 16: geom: heads/cylinder (unused) */
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public readonly short sb_heads;
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/* 18: num of cg's in the filesystem */
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public readonly short sb_ncg;
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/* 20: non-0 indicates fsck required */
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public readonly short sb_dirty;
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/* 22: */
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public readonly short sb_pad0;
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/* 24: superblock ctime */
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public readonly int sb_time;
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/* 28: magic [0] */
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public readonly uint sb_magic;
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/* 32: name of filesystem */
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]
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public readonly byte[] sb_fname;
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/* 38: name of filesystem pack */
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]
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public readonly byte[] sb_fpack;
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/* 44: bitmap size (in bytes) */
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public readonly int sb_bmsize;
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/* 48: total free data blocks */
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public readonly int sb_tfree;
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/* 52: total free inodes */
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public readonly int sb_tinode;
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/* 56: bitmap offset (grown fs) */
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public readonly int sb_bmblock;
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/* 62: repl. superblock offset */
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public readonly int sb_replsb;
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/* 64: last allocated inode */
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public readonly int sb_lastinode;
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/* 68: unused */
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)]
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public readonly byte[] sb_spare;
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/* 88: checksum (all above) */
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public readonly uint sb_checksum;
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}
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}
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} |