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288 lines
10 KiB
C#
288 lines
10 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : Fossil.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Fossil filesystem plugin
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies the Fossil 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.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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using DiscImageChef.DiscImages;
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using Schemas;
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namespace DiscImageChef.Filesystems
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{
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public class Fossil : Filesystem
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{
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const uint FOSSIL_HDR_MAGIC = 0x3776AE89;
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const uint FOSSIL_SB_MAGIC = 0x2340A3B1;
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// Fossil header starts at 128KiB
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const ulong HEADER_POS = 128 * 1024;
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public Fossil()
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{
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Name = "Fossil Filesystem Plugin";
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PluginUuid = new Guid("932BF104-43F6-494F-973C-45EF58A51DA9");
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CurrentEncoding = Encoding.UTF8;
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}
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public Fossil(Encoding encoding)
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{
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Name = "Fossil Filesystem Plugin";
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PluginUuid = new Guid("932BF104-43F6-494F-973C-45EF58A51DA9");
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// Technically everything on Plan 9 from Bell Labs is in UTF-8
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CurrentEncoding = Encoding.UTF8;
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}
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public Fossil(ImagePlugin imagePlugin, Partition partition, Encoding encoding)
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{
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Name = "Fossil Filesystem Plugin";
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PluginUuid = new Guid("932BF104-43F6-494F-973C-45EF58A51DA9");
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// Technically everything on Plan 9 from Bell Labs is in UTF-8
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CurrentEncoding = Encoding.UTF8;
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}
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public override bool Identify(ImagePlugin imagePlugin, Partition partition)
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{
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ulong hdrSector = HEADER_POS / imagePlugin.GetSectorSize();
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FossilHeader hdr;
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if(partition.Start + hdrSector > imagePlugin.GetSectors()) return false;
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byte[] sector = imagePlugin.ReadSector(partition.Start + hdrSector);
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hdr = BigEndianMarshal.ByteArrayToStructureBigEndian<FossilHeader>(sector);
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DicConsole.DebugWriteLine("Fossil plugin", "magic at 0x{0:X8} (expected 0x{1:X8})", hdr.magic,
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FOSSIL_HDR_MAGIC);
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return hdr.magic == FOSSIL_HDR_MAGIC;
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}
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public override void GetInformation(ImagePlugin imagePlugin, Partition partition, out string information)
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{
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information = "";
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if(imagePlugin.GetSectorSize() < 512) return;
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ulong hdrSector = HEADER_POS / imagePlugin.GetSectorSize();
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FossilHeader hdr;
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byte[] sector = imagePlugin.ReadSector(partition.Start + hdrSector);
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hdr = BigEndianMarshal.ByteArrayToStructureBigEndian<FossilHeader>(sector);
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DicConsole.DebugWriteLine("Fossil plugin", "magic at 0x{0:X8} (expected 0x{1:X8})", hdr.magic,
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FOSSIL_HDR_MAGIC);
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StringBuilder sb = new StringBuilder();
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sb.AppendLine("Fossil");
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sb.AppendFormat("Filesystem version {0}", hdr.version).AppendLine();
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sb.AppendFormat("{0} bytes per block", hdr.blockSize).AppendLine();
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sb.AppendFormat("Superblock resides in block {0}", hdr.super).AppendLine();
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sb.AppendFormat("Labels resides in block {0}", hdr.label).AppendLine();
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sb.AppendFormat("Data starts at block {0}", hdr.data).AppendLine();
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sb.AppendFormat("Volume has {0} blocks", hdr.end).AppendLine();
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ulong sbLocation = hdr.super * (hdr.blockSize / imagePlugin.GetSectorSize()) + partition.Start;
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XmlFsType = new FileSystemType
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{
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Type = "Fossil filesystem",
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ClusterSize = hdr.blockSize,
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Clusters = hdr.end
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};
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if(sbLocation <= partition.End)
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{
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sector = imagePlugin.ReadSector(sbLocation);
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FossilSuperBlock fsb = BigEndianMarshal.ByteArrayToStructureBigEndian<FossilSuperBlock>(sector);
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DicConsole.DebugWriteLine("Fossil plugin", "magic 0x{0:X8} (expected 0x{1:X8})", fsb.magic,
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FOSSIL_SB_MAGIC);
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if(fsb.magic == FOSSIL_SB_MAGIC)
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{
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sb.AppendFormat("Epoch low {0}", fsb.epochLow).AppendLine();
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sb.AppendFormat("Epoch high {0}", fsb.epochHigh).AppendLine();
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sb.AppendFormat("Next QID {0}", fsb.qid).AppendLine();
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sb.AppendFormat("Active root block {0}", fsb.active).AppendLine();
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sb.AppendFormat("Next root block {0}", fsb.next).AppendLine();
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sb.AppendFormat("Curren root block {0}", fsb.current).AppendLine();
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sb.AppendFormat("Volume label: \"{0}\"", StringHandlers.CToString(fsb.name, CurrentEncoding))
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.AppendLine();
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XmlFsType.VolumeName = StringHandlers.CToString(fsb.name, CurrentEncoding);
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}
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}
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information = sb.ToString();
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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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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct FossilHeader
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{
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/// <summary>
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/// Magic number
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/// </summary>
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public uint magic;
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/// <summary>
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/// Header version
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/// </summary>
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public ushort version;
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/// <summary>
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/// Block size
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/// </summary>
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public ushort blockSize;
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/// <summary>
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/// Block containing superblock
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/// </summary>
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public uint super;
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/// <summary>
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/// Block containing labels
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/// </summary>
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public uint label;
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/// <summary>
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/// Where do data blocks start
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/// </summary>
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public uint data;
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/// <summary>
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/// How many data blocks does it have
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/// </summary>
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public uint end;
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct FossilSuperBlock
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{
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/// <summary>
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/// Magic number
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/// </summary>
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public uint magic;
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/// <summary>
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/// Header version
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/// </summary>
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public ushort version;
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/// <summary>
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/// file system low epoch
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/// </summary>
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public uint epochLow;
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/// <summary>
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/// file system high(active) epoch
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/// </summary>
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public uint epochHigh;
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/// <summary>
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/// next qid to allocate
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/// </summary>
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public ulong qid;
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/// <summary>
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/// data block number: root of active file system
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/// </summary>
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public int active;
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/// <summary>
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/// data block number: root of next file system to archive
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/// </summary>
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public int next;
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/// <summary>
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/// data block number: root of file system currently being archived
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/// </summary>
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public int current;
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/// <summary>
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/// Venti score of last successful archive
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/// </summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)] public byte[] last;
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/// <summary>
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/// name of file system(just a comment)
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/// </summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)] public byte[] name;
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}
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}
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} |