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245 lines
9.0 KiB
C#
245 lines
9.0 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : extFS.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Linux extended filesystem plugin.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies the Linux extended 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 © 2011-2017 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.Collections.Generic;
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using System.Text;
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using DiscImageChef.CommonTypes;
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namespace DiscImageChef.Filesystems
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{
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// Information from the Linux kernel
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public class extFS : Filesystem
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{
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const int sbPos = 0x400;
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public extFS()
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{
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Name = "Linux extended Filesystem";
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PluginUUID = new Guid("076CB3A2-08C2-4D69-BC8A-FCAA2E502BE2");
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CurrentEncoding = Encoding.GetEncoding("iso-8859-15");
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}
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public extFS(Encoding encoding)
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{
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Name = "Linux extended Filesystem";
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PluginUUID = new Guid("076CB3A2-08C2-4D69-BC8A-FCAA2E502BE2");
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if(encoding == null)
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CurrentEncoding = Encoding.GetEncoding("iso-8859-15");
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else
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CurrentEncoding = encoding;
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}
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public extFS(ImagePlugins.ImagePlugin imagePlugin, Partition partition, Encoding encoding)
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{
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Name = "Linux extended Filesystem";
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PluginUUID = new Guid("076CB3A2-08C2-4D69-BC8A-FCAA2E502BE2");
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if(encoding == null)
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CurrentEncoding = Encoding.GetEncoding("iso-8859-15");
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else
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CurrentEncoding = encoding;
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}
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public override bool Identify(ImagePlugins.ImagePlugin imagePlugin, Partition partition)
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{
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if(imagePlugin.GetSectorSize() < 512)
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return false;
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ulong sbSector = sbPos / imagePlugin.GetSectorSize();
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uint sbOff = sbPos % imagePlugin.GetSectorSize();
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if((sbSector + partition.Start) >= partition.End)
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return false;
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byte[] sb_sector = imagePlugin.ReadSector(sbSector + partition.Start);
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byte[] sb = new byte[512];
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Array.Copy(sb_sector, sbOff, sb, 0, 512);
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ushort magic = BitConverter.ToUInt16(sb, 0x038);
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return magic == extFSMagic;
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}
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public override void GetInformation(ImagePlugins.ImagePlugin imagePlugin, Partition partition, out string information)
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{
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information = "";
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StringBuilder sb = new StringBuilder();
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if(imagePlugin.GetSectorSize() < 512)
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return;
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ulong sbSector = sbPos / imagePlugin.GetSectorSize();
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uint sbOff = sbPos % imagePlugin.GetSectorSize();
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if((sbSector + partition.Start) >= partition.End)
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return;
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byte[] sblock = imagePlugin.ReadSector(sbSector + partition.Start);
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byte[] sb_sector = new byte[512];
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Array.Copy(sblock, sbOff, sb_sector, 0, 512);
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extFSSuperBlock ext_sb = new extFSSuperBlock();
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ext_sb.inodes = BitConverter.ToUInt32(sb_sector, 0x000);
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ext_sb.zones = BitConverter.ToUInt32(sb_sector, 0x004);
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ext_sb.firstfreeblk = BitConverter.ToUInt32(sb_sector, 0x008);
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ext_sb.freecountblk = BitConverter.ToUInt32(sb_sector, 0x00C);
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ext_sb.firstfreeind = BitConverter.ToUInt32(sb_sector, 0x010);
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ext_sb.freecountind = BitConverter.ToUInt32(sb_sector, 0x014);
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ext_sb.firstdatazone = BitConverter.ToUInt32(sb_sector, 0x018);
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ext_sb.logzonesize = BitConverter.ToUInt32(sb_sector, 0x01C);
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ext_sb.maxsize = BitConverter.ToUInt32(sb_sector, 0x020);
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sb.AppendLine("ext filesystem");
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sb.AppendFormat("{0} zones on volume", ext_sb.zones);
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sb.AppendFormat("{0} free blocks ({1} bytes)", ext_sb.freecountblk, ext_sb.freecountblk * 1024);
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sb.AppendFormat("{0} inodes on volume, {1} free ({2}%)", ext_sb.inodes, ext_sb.freecountind, ext_sb.freecountind * 100 / ext_sb.inodes);
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sb.AppendFormat("First free inode is {0}", ext_sb.firstfreeind);
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sb.AppendFormat("First free block is {0}", ext_sb.firstfreeblk);
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sb.AppendFormat("First data zone is {0}", ext_sb.firstdatazone);
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sb.AppendFormat("Log zone size: {0}", ext_sb.logzonesize);
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sb.AppendFormat("Max zone size: {0}", ext_sb.maxsize);
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xmlFSType = new Schemas.FileSystemType();
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xmlFSType.Type = "ext";
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xmlFSType.FreeClusters = ext_sb.freecountblk;
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xmlFSType.FreeClustersSpecified = true;
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xmlFSType.ClusterSize = 1024;
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xmlFSType.Clusters = (long)((partition.End - partition.Start + 1) * imagePlugin.GetSectorSize() / 1024);
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information = sb.ToString();
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}
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/// <summary>
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/// ext superblock magic
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/// </summary>
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public const ushort extFSMagic = 0x137D;
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/// <summary>
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/// ext superblock
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/// </summary>
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public struct extFSSuperBlock
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{
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/// <summary>0x000, inodes on volume</summary>
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public uint inodes;
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/// <summary>0x004, zones on volume</summary>
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public uint zones;
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/// <summary>0x008, first free block</summary>
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public uint firstfreeblk;
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/// <summary>0x00C, free blocks count</summary>
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public uint freecountblk;
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/// <summary>0x010, first free inode</summary>
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public uint firstfreeind;
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/// <summary>0x014, free inodes count</summary>
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public uint freecountind;
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/// <summary>0x018, first data zone</summary>
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public uint firstdatazone;
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/// <summary>0x01C, log zone size</summary>
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public uint logzonesize;
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/// <summary>0x020, max zone size</summary>
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public uint maxsize;
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/// <summary>0x024, reserved</summary>
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public uint reserved1;
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/// <summary>0x028, reserved</summary>
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public uint reserved2;
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/// <summary>0x02C, reserved</summary>
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public uint reserved3;
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/// <summary>0x030, reserved</summary>
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public uint reserved4;
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/// <summary>0x034, reserved</summary>
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public uint reserved5;
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/// <summary>0x038, 0x137D (little endian)</summary>
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public ushort magic;
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}
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public override Errno Mount()
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{
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return Errno.NotImplemented;
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}
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public override Errno Mount(bool debug)
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{
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return Errno.NotImplemented;
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}
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public override Errno Unmount()
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{
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return Errno.NotImplemented;
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}
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public override Errno MapBlock(string path, long fileBlock, ref long deviceBlock)
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{
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return Errno.NotImplemented;
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}
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public override Errno GetAttributes(string path, ref FileAttributes attributes)
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{
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return Errno.NotImplemented;
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}
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public override Errno ListXAttr(string path, ref List<string> xattrs)
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{
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return Errno.NotImplemented;
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}
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public override Errno GetXattr(string path, string xattr, ref byte[] buf)
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{
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return Errno.NotImplemented;
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}
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public override Errno Read(string path, long offset, long size, ref byte[] buf)
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{
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return Errno.NotImplemented;
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}
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public override Errno ReadDir(string path, ref List<string> contents)
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{
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return Errno.NotImplemented;
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}
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public override Errno StatFs(ref FileSystemInfo stat)
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{
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return Errno.NotImplemented;
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}
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public override Errno Stat(string path, ref FileEntryInfo stat)
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{
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return Errno.NotImplemented;
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}
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public override Errno ReadLink(string path, ref string dest)
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{
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return Errno.NotImplemented;
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}
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}
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} |