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326 lines
13 KiB
C#
326 lines
13 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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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 : Component
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies the EFS 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.Runtime.InteropServices;
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using System.Text;
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using DiscImageChef.CommonTypes;
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using DiscImageChef.Console;
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namespace DiscImageChef.Filesystems
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{
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public class EFS : Filesystem
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{
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct EFS_Superblock
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{
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/* 0: fs size incl. bb 0 (in bb) */
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public int sb_size;
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/* 4: first cg offset (in bb) */
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public int sb_firstcg;
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/* 8: cg size (in bb) */
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public int sb_cgfsize;
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/* 12: inodes/cg (in bb) */
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public short sb_cgisize;
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/* 14: geom: sectors/track */
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public short sb_sectors;
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/* 16: geom: heads/cylinder (unused) */
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public short sb_heads;
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/* 18: num of cg's in the filesystem */
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public short sb_ncg;
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/* 20: non-0 indicates fsck required */
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public short sb_dirty;
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/* 22: */
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public short sb_pad0;
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/* 24: superblock ctime */
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public int sb_time;
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/* 28: magic [0] */
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public 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 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 byte[] sb_fpack;
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/* 44: bitmap size (in bytes) */
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public int sb_bmsize;
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/* 48: total free data blocks */
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public int sb_tfree;
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/* 52: total free inodes */
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public int sb_tinode;
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/* 56: bitmap offset (grown fs) */
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public int sb_bmblock;
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/* 62: repl. superblock offset */
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public int sb_replsb;
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/* 64: last allocated inode */
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public int sb_lastinode;
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/* 68: unused */
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)]
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public byte[] sb_spare;
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/* 88: checksum (all above) */
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public uint sb_checksum;
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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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public EFS()
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{
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Name = "Extent File System Plugin";
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PluginUUID = new Guid("52A43F90-9AF3-4391-ADFE-65598DEEABAB");
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CurrentEncoding = Encoding.GetEncoding("iso-8859-15");
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}
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public EFS(Encoding encoding)
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{
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Name = "Extent File System Plugin";
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PluginUUID = new Guid("52A43F90-9AF3-4391-ADFE-65598DEEABAB");
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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 EFS(ImagePlugins.ImagePlugin imagePlugin, Partition partition, Encoding encoding)
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{
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Name = "Extent File System Plugin";
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PluginUUID = new Guid("52A43F90-9AF3-4391-ADFE-65598DEEABAB");
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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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// Misaligned
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if(imagePlugin.ImageInfo.xmlMediaType == ImagePlugins.XmlMediaType.OpticalDisc)
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{
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EFS_Superblock efs_sb = new EFS_Superblock();
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uint sbSize = (uint)((Marshal.SizeOf(efs_sb) + 0x200) / imagePlugin.GetSectorSize());
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if((Marshal.SizeOf(efs_sb) + 0x200) % imagePlugin.GetSectorSize() != 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(efs_sb))
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return false;
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byte[] sbpiece = new byte[Marshal.SizeOf(efs_sb)];
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Array.Copy(sector, 0x200, sbpiece, 0, Marshal.SizeOf(efs_sb));
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efs_sb = BigEndianMarshal.ByteArrayToStructureBigEndian<EFS_Superblock>(sbpiece);
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DicConsole.DebugWriteLine("EFS plugin", "magic at 0x{0:X3} = 0x{1:X8} (expected 0x{2:X8} or 0x{3:X8})", 0x200, efs_sb.sb_magic, EFS_Magic, EFS_Magic_New);
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if(efs_sb.sb_magic == EFS_Magic || efs_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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EFS_Superblock efsSb = new EFS_Superblock();
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uint sbSize = (uint)(Marshal.SizeOf(efsSb) / imagePlugin.GetSectorSize());
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if(Marshal.SizeOf(efsSb) % imagePlugin.GetSectorSize() != 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(efsSb))
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return false;
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efsSb = BigEndianMarshal.ByteArrayToStructureBigEndian<EFS_Superblock>(sector);
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DicConsole.DebugWriteLine("EFS plugin", "magic at {0} = 0x{1:X8} (expected 0x{2:X8} or 0x{3:X8})", 1, efsSb.sb_magic, EFS_Magic, EFS_Magic_New);
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if(efsSb.sb_magic == EFS_Magic || efsSb.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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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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if(imagePlugin.GetSectorSize() < 512)
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return;
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EFS_Superblock efsSb = new EFS_Superblock();
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// Misaligned
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if(imagePlugin.ImageInfo.xmlMediaType == ImagePlugins.XmlMediaType.OpticalDisc)
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{
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uint sbSize = (uint)((Marshal.SizeOf(efsSb) + 0x400) / imagePlugin.GetSectorSize());
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if((Marshal.SizeOf(efsSb) + 0x400) % imagePlugin.GetSectorSize() != 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(efsSb))
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return;
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byte[] sbpiece = new byte[Marshal.SizeOf(efsSb)];
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Array.Copy(sector, 0x200, sbpiece, 0, Marshal.SizeOf(efsSb));
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efsSb = BigEndianMarshal.ByteArrayToStructureBigEndian<EFS_Superblock>(sbpiece);
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DicConsole.DebugWriteLine("EFS plugin", "magic at 0x{0:X3} = 0x{1:X8} (expected 0x{2:X8} or 0x{3:X8})", 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(efsSb) / imagePlugin.GetSectorSize());
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if(Marshal.SizeOf(efsSb) % imagePlugin.GetSectorSize() != 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(efsSb))
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return;
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efsSb = BigEndianMarshal.ByteArrayToStructureBigEndian<EFS_Superblock>(sector);
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DicConsole.DebugWriteLine("EFS plugin", "magic at {0} = 0x{1:X8} (expected 0x{2:X8} or 0x{3:X8})", 1, efsSb.sb_magic, EFS_Magic, EFS_Magic_New);
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}
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if(efsSb.sb_magic != EFS_Magic && efsSb.sb_magic != EFS_Magic_New)
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return;
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StringBuilder 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, CurrentEncoding)).AppendLine();
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sb.AppendFormat("Volume pack: {0}", StringHandlers.CToString(efsSb.sb_fpack, CurrentEncoding)).AppendLine();
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information = sb.ToString();
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xmlFSType = new Schemas.FileSystemType
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{
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Type = "Extent File System",
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ClusterSize = 512,
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Clusters = efsSb.sb_size,
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FreeClusters = 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, CurrentEncoding),
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VolumeSerial = string.Format("{0:X8}", efsSb.sb_checksum),
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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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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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} |