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https://github.com/aaru-dps/Aaru.git
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190 lines
8.4 KiB
C#
190 lines
8.4 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : Xia.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Xia filesystem plugin.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies the Xia 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.Interfaces;
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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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// Information from the Linux kernel
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public class Xia : IFilesystem
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{
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const uint XIAFS_SUPER_MAGIC = 0x012FD16D;
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const uint XIAFS_ROOT_INO = 1;
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const uint XIAFS_BAD_INO = 2;
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const int XIAFS_MAX_LINK = 64000;
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const int XIAFS_DIR_SIZE = 12;
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const int XIAFS_NUM_BLOCK_POINTERS = 10;
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const int XIAFS_NAME_LEN = 248;
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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 => "Xia filesystem";
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public Guid Id => new Guid("169E1DE5-24F2-4EF6-A04D-A4B2CA66DE9D");
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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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int sbSizeInBytes = Marshal.SizeOf<XiaSuperBlock>();
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uint sbSizeInSectors = (uint)(sbSizeInBytes / imagePlugin.Info.SectorSize);
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if(sbSizeInBytes % imagePlugin.Info.SectorSize > 0) sbSizeInSectors++;
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if(sbSizeInSectors + partition.Start >= partition.End) return false;
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byte[] sbSector = imagePlugin.ReadSectors(partition.Start, sbSizeInSectors);
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XiaSuperBlock supblk = Marshal.ByteArrayToStructureLittleEndian<XiaSuperBlock>(sbSector);
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return supblk.s_magic == XIAFS_SUPER_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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StringBuilder sb = new StringBuilder();
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int sbSizeInBytes = Marshal.SizeOf<XiaSuperBlock>();
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uint sbSizeInSectors = (uint)(sbSizeInBytes / imagePlugin.Info.SectorSize);
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if(sbSizeInBytes % imagePlugin.Info.SectorSize > 0) sbSizeInSectors++;
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byte[] sbSector = imagePlugin.ReadSectors(partition.Start, sbSizeInSectors);
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XiaSuperBlock supblk = Marshal.ByteArrayToStructureLittleEndian<XiaSuperBlock>(sbSector);
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sb.AppendFormat("{0} bytes per zone", supblk.s_zone_size).AppendLine();
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sb.AppendFormat("{0} zones in volume ({1} bytes)", supblk.s_nzones, supblk.s_nzones * supblk.s_zone_size)
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.AppendLine();
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sb.AppendFormat("{0} inodes", supblk.s_ninodes).AppendLine();
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sb.AppendFormat("{0} data zones ({1} bytes)", supblk.s_ndatazones, supblk.s_ndatazones * supblk.s_zone_size)
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.AppendLine();
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sb.AppendFormat("{0} imap zones ({1} bytes)", supblk.s_imap_zones, supblk.s_imap_zones * supblk.s_zone_size)
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.AppendLine();
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sb.AppendFormat("{0} zmap zones ({1} bytes)", supblk.s_zmap_zones, supblk.s_zmap_zones * supblk.s_zone_size)
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.AppendLine();
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sb.AppendFormat("First data zone: {0}", supblk.s_firstdatazone).AppendLine();
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sb.AppendFormat("Maximum filesize is {0} bytes ({1} MiB)", supblk.s_max_size, supblk.s_max_size / 1048576)
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.AppendLine();
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sb.AppendFormat("{0} zones reserved for kernel images ({1} bytes)", supblk.s_kernzones,
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supblk.s_kernzones * supblk.s_zone_size).AppendLine();
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sb.AppendFormat("First kernel zone: {0}", supblk.s_firstkernzone).AppendLine();
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XmlFsType = new FileSystemType
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{
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Bootable = !ArrayHelpers.ArrayIsNullOrEmpty(supblk.s_boot_segment),
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Clusters = supblk.s_nzones,
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ClusterSize = supblk.s_zone_size,
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Type = "Xia filesystem"
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};
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information = sb.ToString();
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}
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/// <summary>
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/// Xia superblock
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/// </summary>
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct XiaSuperBlock
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{
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/// <summary>1st sector reserved for boot</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 512)]
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public readonly byte[] s_boot_segment;
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/// <summary>the name says it</summary>
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public readonly uint s_zone_size;
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/// <summary>volume size, zone aligned</summary>
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public readonly uint s_nzones;
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/// <summary># of inodes</summary>
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public readonly uint s_ninodes;
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/// <summary># of data zones</summary>
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public readonly uint s_ndatazones;
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/// <summary># of imap zones</summary>
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public readonly uint s_imap_zones;
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/// <summary># of zmap zones</summary>
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public readonly uint s_zmap_zones;
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/// <summary>first data zone</summary>
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public readonly uint s_firstdatazone;
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/// <summary>z size = 1KB << z shift</summary>
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public readonly uint s_zone_shift;
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/// <summary>max size of a single file</summary>
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public readonly uint s_max_size;
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/// <summary>reserved</summary>
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public readonly uint s_reserved0;
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/// <summary>reserved</summary>
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public readonly uint s_reserved1;
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/// <summary>reserved</summary>
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public readonly uint s_reserved2;
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/// <summary>reserved</summary>
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public readonly uint s_reserved3;
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/// <summary>first kernel zone</summary>
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public readonly uint s_firstkernzone;
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/// <summary>kernel size in zones</summary>
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public readonly uint s_kernzones;
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/// <summary>magic number for xiafs</summary>
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public readonly uint s_magic;
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}
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/// <summary>
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/// Xia directory entry
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/// </summary>
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct XiaDirect
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{
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public readonly uint d_ino;
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public readonly ushort d_rec_len;
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public readonly byte d_name_len;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = XIAFS_NAME_LEN + 1)]
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public readonly byte[] d_name;
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}
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/// <summary>
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/// Xia inode
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/// </summary>
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct XiaInode
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{
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public readonly ushort i_mode;
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public readonly ushort i_nlinks;
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public readonly ushort i_uid;
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public readonly ushort i_gid;
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public readonly uint i_size;
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public readonly uint i_ctime;
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public readonly uint i_atime;
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public readonly uint i_mtime;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = XIAFS_NUM_BLOCK_POINTERS)]
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public readonly uint[] i_zone;
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}
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}
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} |