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https://github.com/aaru-dps/Aaru.git
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189 lines
8.7 KiB
C#
189 lines
8.7 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : Reiser.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Reiser filesystem plugin
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies the Reiser filesystem 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 © 2011-2018 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.Linq;
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using System.Runtime.InteropServices;
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using System.Text;
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using DiscImageChef.CommonTypes;
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using DiscImageChef.CommonTypes.Interfaces;
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using Schemas;
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namespace DiscImageChef.Filesystems
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{
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public class Reiser : IFilesystem
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{
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const uint REISER_SUPER_OFFSET = 0x10000;
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readonly byte[] reiser35_magic = {0x52, 0x65, 0x49, 0x73, 0x45, 0x72, 0x46, 0x73, 0x00, 0x00};
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readonly byte[] reiser36_magic = {0x52, 0x65, 0x49, 0x73, 0x45, 0x72, 0x32, 0x46, 0x73, 0x00};
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readonly byte[] reiserJr_magic = {0x52, 0x65, 0x49, 0x73, 0x45, 0x72, 0x33, 0x46, 0x73, 0x00};
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public FileSystemType XmlFsType { get; private set; }
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public Encoding Encoding { get; private set; }
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public string Name => "Reiser Filesystem Plugin";
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public Guid Id => new Guid("1D8CD8B8-27E6-410F-9973-D16409225FBA");
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public string Author => "Natalia Portillo";
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public bool Identify(IMediaImage imagePlugin, Partition partition)
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{
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if(imagePlugin.Info.SectorSize < 512) return false;
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uint sbAddr = REISER_SUPER_OFFSET / imagePlugin.Info.SectorSize;
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if(sbAddr == 0) sbAddr = 1;
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Reiser_Superblock reiserSb = new Reiser_Superblock();
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uint sbSize = (uint)(Marshal.SizeOf(reiserSb) / imagePlugin.Info.SectorSize);
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if(Marshal.SizeOf(reiserSb) % imagePlugin.Info.SectorSize != 0) sbSize++;
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if(partition.Start + sbAddr + sbSize >= partition.End) return false;
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byte[] sector = imagePlugin.ReadSectors(partition.Start + sbAddr, sbSize);
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if(sector.Length < Marshal.SizeOf(reiserSb)) return false;
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IntPtr sbPtr = Marshal.AllocHGlobal(Marshal.SizeOf(reiserSb));
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Marshal.Copy(sector, 0, sbPtr, Marshal.SizeOf(reiserSb));
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reiserSb = (Reiser_Superblock)Marshal.PtrToStructure(sbPtr, typeof(Reiser_Superblock));
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Marshal.FreeHGlobal(sbPtr);
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return reiser35_magic.SequenceEqual(reiserSb.magic) || reiser36_magic.SequenceEqual(reiserSb.magic) ||
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reiserJr_magic.SequenceEqual(reiserSb.magic);
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}
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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) return;
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uint sbAddr = REISER_SUPER_OFFSET / imagePlugin.Info.SectorSize;
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if(sbAddr == 0) sbAddr = 1;
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Reiser_Superblock reiserSb = new Reiser_Superblock();
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uint sbSize = (uint)(Marshal.SizeOf(reiserSb) / imagePlugin.Info.SectorSize);
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if(Marshal.SizeOf(reiserSb) % imagePlugin.Info.SectorSize != 0) sbSize++;
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byte[] sector = imagePlugin.ReadSectors(partition.Start + sbAddr, sbSize);
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if(sector.Length < Marshal.SizeOf(reiserSb)) return;
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IntPtr sbPtr = Marshal.AllocHGlobal(Marshal.SizeOf(reiserSb));
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Marshal.Copy(sector, 0, sbPtr, Marshal.SizeOf(reiserSb));
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reiserSb = (Reiser_Superblock)Marshal.PtrToStructure(sbPtr, typeof(Reiser_Superblock));
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Marshal.FreeHGlobal(sbPtr);
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if(!reiser35_magic.SequenceEqual(reiserSb.magic) && !reiser36_magic.SequenceEqual(reiserSb.magic) &&
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!reiserJr_magic.SequenceEqual(reiserSb.magic)) return;
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StringBuilder sb = new StringBuilder();
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if(reiser35_magic.SequenceEqual(reiserSb.magic)) sb.AppendLine("Reiser 3.5 filesystem");
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else if(reiser36_magic.SequenceEqual(reiserSb.magic)) sb.AppendLine("Reiser 3.6 filesystem");
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else if(reiserJr_magic.SequenceEqual(reiserSb.magic)) sb.AppendLine("Reiser Jr. filesystem");
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sb.AppendFormat("Volume has {0} blocks with {1} blocks free", reiserSb.block_count, reiserSb.free_blocks)
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.AppendLine();
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sb.AppendFormat("{0} bytes per block", reiserSb.blocksize).AppendLine();
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sb.AppendFormat("Root directory resides on block {0}", reiserSb.root_block).AppendLine();
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if(reiserSb.umount_state == 2) sb.AppendLine("Volume has not been cleanly umounted");
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sb.AppendFormat("Volume last checked on {0}", DateHandlers.UnixUnsignedToDateTime(reiserSb.last_check))
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.AppendLine();
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if(reiserSb.version >= 2)
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{
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sb.AppendFormat("Volume UUID: {0}", reiserSb.uuid).AppendLine();
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sb.AppendFormat("Volume name: {0}", Encoding.GetString(reiserSb.label)).AppendLine();
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}
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information = sb.ToString();
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XmlFsType = new FileSystemType();
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if(reiser35_magic.SequenceEqual(reiserSb.magic)) XmlFsType.Type = "Reiser 3.5 filesystem";
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else if(reiser36_magic.SequenceEqual(reiserSb.magic)) XmlFsType.Type = "Reiser 3.6 filesystem";
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else if(reiserJr_magic.SequenceEqual(reiserSb.magic)) XmlFsType.Type = "Reiser Jr. filesystem";
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XmlFsType.ClusterSize = reiserSb.blocksize;
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XmlFsType.Clusters = reiserSb.block_count;
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XmlFsType.FreeClusters = reiserSb.free_blocks;
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XmlFsType.FreeClustersSpecified = true;
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XmlFsType.Dirty = reiserSb.umount_state == 2;
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if(reiserSb.version < 2) return;
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XmlFsType.VolumeName = Encoding.GetString(reiserSb.label);
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XmlFsType.VolumeSerial = reiserSb.uuid.ToString();
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct ReiserJournalParams
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{
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public uint journal_1stblock;
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public uint journal_dev;
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public uint journal_size;
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public uint journal_trans_max;
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public uint journal_magic;
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public uint journal_max_batch;
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public uint journal_max_commit_age;
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public uint journal_max_trans_age;
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct Reiser_Superblock
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{
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public uint block_count;
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public uint free_blocks;
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public uint root_block;
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public ReiserJournalParams journal;
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public ushort blocksize;
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public ushort oid_maxsize;
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public ushort oid_cursize;
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public ushort umount_state;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 10)]
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public byte[] magic;
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public ushort fs_state;
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public uint hash_function_code;
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public ushort tree_height;
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public ushort bmap_nr;
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public ushort version;
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public ushort reserved_for_journal;
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public uint inode_generation;
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public uint flags;
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public Guid uuid;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
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public byte[] label;
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public ushort mnt_count;
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public ushort max_mnt_count;
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public uint last_check;
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public uint check_interval;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 76)]
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public byte[] unused;
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}
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}
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} |