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250 lines
11 KiB
C#
250 lines
11 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : XFS.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : XFS filesystem plugin.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies the XFS 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 © 2011-2019 Natalia Portillo
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// ****************************************************************************/
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using System;
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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.Enums;
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using DiscImageChef.CommonTypes.Interfaces;
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using DiscImageChef.Console;
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using Schemas;
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using Marshal = DiscImageChef.Helpers.Marshal;
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namespace DiscImageChef.Filesystems
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{
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public class XFS : IFilesystem
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{
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const uint XFS_MAGIC = 0x58465342;
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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 => "XFS 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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// Misaligned
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if(imagePlugin.Info.XmlMediaType == XmlMediaType.OpticalDisc)
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{
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uint sbSize = (uint)((Marshal.SizeOf<XFS_Superblock>() + 0x400) / imagePlugin.Info.SectorSize);
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if((Marshal.SizeOf<XFS_Superblock>() + 0x400) % imagePlugin.Info.SectorSize != 0) sbSize++;
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byte[] sector = imagePlugin.ReadSectors(partition.Start, sbSize);
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if(sector.Length < Marshal.SizeOf<XFS_Superblock>()) return false;
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byte[] sbpiece = new byte[Marshal.SizeOf<XFS_Superblock>()];
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foreach(int location in new[] {0, 0x200, 0x400})
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{
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Array.Copy(sector, location, sbpiece, 0, Marshal.SizeOf<XFS_Superblock>());
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XFS_Superblock xfsSb = Marshal.ByteArrayToStructureBigEndian<XFS_Superblock>(sbpiece);
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DicConsole.DebugWriteLine("XFS plugin", "magic at 0x{0:X3} = 0x{1:X8} (expected 0x{2:X8})",
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location, xfsSb.magicnum, XFS_MAGIC);
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if(xfsSb.magicnum == XFS_MAGIC) return true;
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}
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}
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else
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foreach(int i in new[] {0, 1, 2})
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{
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ulong location = (ulong)i;
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uint sbSize = (uint)(Marshal.SizeOf<XFS_Superblock>() / imagePlugin.Info.SectorSize);
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if(Marshal.SizeOf<XFS_Superblock>() % imagePlugin.Info.SectorSize != 0) sbSize++;
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byte[] sector = imagePlugin.ReadSectors(partition.Start + location, sbSize);
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if(sector.Length < Marshal.SizeOf<XFS_Superblock>()) return false;
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XFS_Superblock xfsSb = Marshal.ByteArrayToStructureBigEndian<XFS_Superblock>(sector);
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DicConsole.DebugWriteLine("XFS plugin", "magic at {0} = 0x{1:X8} (expected 0x{2:X8})", location,
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xfsSb.magicnum, XFS_MAGIC);
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if(xfsSb.magicnum == XFS_MAGIC) return true;
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}
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return false;
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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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XFS_Superblock xfsSb = new XFS_Superblock();
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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<XFS_Superblock>() + 0x400) / imagePlugin.Info.SectorSize);
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if((Marshal.SizeOf<XFS_Superblock>() + 0x400) % imagePlugin.Info.SectorSize != 0) sbSize++;
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byte[] sector = imagePlugin.ReadSectors(partition.Start, sbSize);
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if(sector.Length < Marshal.SizeOf<XFS_Superblock>()) return;
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byte[] sbpiece = new byte[Marshal.SizeOf<XFS_Superblock>()];
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foreach(int location in new[] {0, 0x200, 0x400})
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{
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Array.Copy(sector, location, sbpiece, 0, Marshal.SizeOf<XFS_Superblock>());
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xfsSb = Marshal.ByteArrayToStructureBigEndian<XFS_Superblock>(sbpiece);
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DicConsole.DebugWriteLine("XFS plugin", "magic at 0x{0:X3} = 0x{1:X8} (expected 0x{2:X8})",
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location, xfsSb.magicnum, XFS_MAGIC);
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if(xfsSb.magicnum == XFS_MAGIC) break;
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}
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}
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else
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foreach(int i in new[] {0, 1, 2})
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{
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ulong location = (ulong)i;
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uint sbSize = (uint)(Marshal.SizeOf<XFS_Superblock>() / imagePlugin.Info.SectorSize);
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if(Marshal.SizeOf<XFS_Superblock>() % imagePlugin.Info.SectorSize != 0) sbSize++;
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byte[] sector = imagePlugin.ReadSectors(partition.Start + location, sbSize);
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if(sector.Length < Marshal.SizeOf<XFS_Superblock>()) return;
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xfsSb = Marshal.ByteArrayToStructureBigEndian<XFS_Superblock>(sector);
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DicConsole.DebugWriteLine("XFS plugin", "magic at {0} = 0x{1:X8} (expected 0x{2:X8})", location,
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xfsSb.magicnum, XFS_MAGIC);
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if(xfsSb.magicnum == XFS_MAGIC) break;
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}
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if(xfsSb.magicnum != XFS_MAGIC) return;
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StringBuilder sb = new StringBuilder();
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sb.AppendLine("XFS filesystem");
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sb.AppendFormat("Filesystem version {0}", xfsSb.version & 0xF).AppendLine();
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sb.AppendFormat("{0} bytes per sector", xfsSb.sectsize).AppendLine();
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sb.AppendFormat("{0} bytes per block", xfsSb.blocksize).AppendLine();
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sb.AppendFormat("{0} bytes per inode", xfsSb.inodesize).AppendLine();
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sb.AppendFormat("{0} data blocks in volume, {1} free", xfsSb.dblocks, xfsSb.fdblocks).AppendLine();
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sb.AppendFormat("{0} blocks per allocation group", xfsSb.agblocks).AppendLine();
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sb.AppendFormat("{0} allocation groups in volume", xfsSb.agcount).AppendLine();
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sb.AppendFormat("{0} inodes in volume, {1} free", xfsSb.icount, xfsSb.ifree).AppendLine();
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if(xfsSb.inprogress > 0) sb.AppendLine("fsck in progress");
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sb.AppendFormat("Volume name: {0}", StringHandlers.CToString(xfsSb.fname, Encoding)).AppendLine();
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sb.AppendFormat("Volume UUID: {0}", xfsSb.uuid).AppendLine();
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information = sb.ToString();
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XmlFsType = new FileSystemType
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{
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Type = "XFS filesystem",
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ClusterSize = xfsSb.blocksize,
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Clusters = xfsSb.dblocks,
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FreeClusters = xfsSb.fdblocks,
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FreeClustersSpecified = true,
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Files = xfsSb.icount - xfsSb.ifree,
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FilesSpecified = true,
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Dirty = xfsSb.inprogress > 0,
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VolumeName = StringHandlers.CToString(xfsSb.fname, Encoding),
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VolumeSerial = xfsSb.uuid.ToString()
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};
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct XFS_Superblock
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{
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public readonly uint magicnum;
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public readonly uint blocksize;
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public readonly ulong dblocks;
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public readonly ulong rblocks;
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public readonly ulong rextents;
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public readonly Guid uuid;
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public readonly ulong logstat;
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public readonly ulong rootino;
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public readonly ulong rbmino;
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public readonly ulong rsumino;
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public readonly uint rextsize;
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public readonly uint agblocks;
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public readonly uint agcount;
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public readonly uint rbmblocks;
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public readonly uint logblocks;
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public readonly ushort version;
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public readonly ushort sectsize;
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public readonly ushort inodesize;
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public readonly ushort inopblock;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
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public readonly byte[] fname;
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public readonly byte blocklog;
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public readonly byte sectlog;
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public readonly byte inodelog;
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public readonly byte inopblog;
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public readonly byte agblklog;
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public readonly byte rextslog;
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public readonly byte inprogress;
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public readonly byte imax_pct;
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public readonly ulong icount;
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public readonly ulong ifree;
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public readonly ulong fdblocks;
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public readonly ulong frextents;
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public readonly ulong uquotino;
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public readonly ulong gquotino;
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public readonly ushort qflags;
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public readonly byte flags;
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public readonly byte shared_vn;
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public readonly ulong inoalignmt;
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public readonly ulong unit;
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public readonly ulong width;
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public readonly byte dirblklog;
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public readonly byte logsectlog;
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public readonly ushort logsectsize;
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public readonly uint logsunit;
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public readonly uint features2;
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public readonly uint bad_features2;
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public readonly uint features_compat;
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public readonly uint features_ro_compat;
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public readonly uint features_incompat;
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public readonly uint features_log_incompat;
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// This field is little-endian while rest of superblock is big-endian
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public readonly uint crc;
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public readonly uint spino_align;
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public readonly ulong pquotino;
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public readonly ulong lsn;
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public readonly Guid meta_uuid;
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}
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}
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} |