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207 lines
9.6 KiB
C#
207 lines
9.6 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : F2FS.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : F2FS filesystem plugin.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies the F2FS 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.Diagnostics.CodeAnalysis;
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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.DiscImages;
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using Schemas;
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namespace DiscImageChef.Filesystems
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{
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public class F2FS : IFilesystem
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{
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const uint F2FS_MAGIC = 0xF2F52010;
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const uint F2FS_SUPER_OFFSET = 1024;
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const uint F2FS_MIN_SECTOR = 512;
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const uint F2FS_MAX_SECTOR = 4096;
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const uint F2FS_BLOCK_SIZE = 4096;
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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 => "F2FS Plugin";
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public Guid Id => new Guid("82B0920F-5F0D-4063-9F57-ADE0AE02ECE5");
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public bool Identify(IMediaImage imagePlugin, Partition partition)
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{
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if(imagePlugin.Info.SectorSize < F2FS_MIN_SECTOR || imagePlugin.Info.SectorSize > F2FS_MAX_SECTOR)
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return false;
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uint sbAddr = F2FS_SUPER_OFFSET / imagePlugin.Info.SectorSize;
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if(sbAddr == 0) sbAddr = 1;
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F2FS_Superblock f2fsSb = new F2FS_Superblock();
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uint sbSize = (uint)(Marshal.SizeOf(f2fsSb) / imagePlugin.Info.SectorSize);
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if(Marshal.SizeOf(f2fsSb) % imagePlugin.Info.SectorSize != 0) sbSize++;
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if(partition.Start + sbAddr >= partition.End) return false;
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byte[] sector = imagePlugin.ReadSectors(partition.Start + sbAddr, sbSize);
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if(sector.Length < Marshal.SizeOf(f2fsSb)) return false;
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IntPtr sbPtr = Marshal.AllocHGlobal(Marshal.SizeOf(f2fsSb));
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Marshal.Copy(sector, 0, sbPtr, Marshal.SizeOf(f2fsSb));
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f2fsSb = (F2FS_Superblock)Marshal.PtrToStructure(sbPtr, typeof(F2FS_Superblock));
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Marshal.FreeHGlobal(sbPtr);
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return f2fsSb.magic == F2FS_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.Unicode;
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information = "";
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if(imagePlugin.Info.SectorSize < F2FS_MIN_SECTOR || imagePlugin.Info.SectorSize > F2FS_MAX_SECTOR) return;
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uint sbAddr = F2FS_SUPER_OFFSET / imagePlugin.Info.SectorSize;
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if(sbAddr == 0) sbAddr = 1;
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F2FS_Superblock f2fsSb = new F2FS_Superblock();
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uint sbSize = (uint)(Marshal.SizeOf(f2fsSb) / imagePlugin.Info.SectorSize);
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if(Marshal.SizeOf(f2fsSb) % imagePlugin.Info.SectorSize != 0) sbSize++;
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byte[] sector = imagePlugin.ReadSectors(partition.Start + sbAddr, sbSize);
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if(sector.Length < Marshal.SizeOf(f2fsSb)) return;
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IntPtr sbPtr = Marshal.AllocHGlobal(Marshal.SizeOf(f2fsSb));
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Marshal.Copy(sector, 0, sbPtr, Marshal.SizeOf(f2fsSb));
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f2fsSb = (F2FS_Superblock)Marshal.PtrToStructure(sbPtr, typeof(F2FS_Superblock));
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Marshal.FreeHGlobal(sbPtr);
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if(f2fsSb.magic != F2FS_MAGIC) return;
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StringBuilder sb = new StringBuilder();
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sb.AppendLine("F2FS filesystem");
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sb.AppendFormat("Version {0}.{1}", f2fsSb.major_ver, f2fsSb.minor_ver).AppendLine();
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sb.AppendFormat("{0} bytes per sector", 1 << (int)f2fsSb.log_sectorsize).AppendLine();
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sb.AppendFormat("{0} sectors ({1} bytes) per block", 1 << (int)f2fsSb.log_sectors_per_block,
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1 << (int)f2fsSb.log_blocksize).AppendLine();
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sb.AppendFormat("{0} blocks per segment", f2fsSb.log_blocks_per_seg).AppendLine();
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sb.AppendFormat("{0} blocks in volume", f2fsSb.block_count).AppendLine();
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sb.AppendFormat("{0} segments per section", f2fsSb.segs_per_sec).AppendLine();
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sb.AppendFormat("{0} sections per zone", f2fsSb.secs_per_zone).AppendLine();
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sb.AppendFormat("{0} sections", f2fsSb.section_count).AppendLine();
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sb.AppendFormat("{0} segments", f2fsSb.segment_count).AppendLine();
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sb.AppendFormat("Root directory resides on inode {0}", f2fsSb.root_ino).AppendLine();
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sb.AppendFormat("Volume UUID: {0}", f2fsSb.uuid).AppendLine();
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sb.AppendFormat("Volume name: {0}", StringHandlers.CToString(f2fsSb.volume_name, Encoding.Unicode, true))
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.AppendLine();
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sb.AppendFormat("Volume last mounted on kernel version: {0}", StringHandlers.CToString(f2fsSb.version))
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.AppendLine();
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sb.AppendFormat("Volume created on kernel version: {0}", StringHandlers.CToString(f2fsSb.init_version))
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.AppendLine();
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information = sb.ToString();
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XmlFsType = new FileSystemType
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{
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Type = "F2FS filesystem",
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SystemIdentifier = Encoding.ASCII.GetString(f2fsSb.version),
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Clusters = (long)f2fsSb.block_count,
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ClusterSize = 1 << (int)f2fsSb.log_blocksize,
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DataPreparerIdentifier = Encoding.ASCII.GetString(f2fsSb.init_version),
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VolumeName = StringHandlers.CToString(f2fsSb.volume_name, Encoding.Unicode, true),
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VolumeSerial = f2fsSb.uuid.ToString()
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};
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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[SuppressMessage("ReSharper", "InconsistentNaming")]
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struct F2FS_Superblock
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{
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public uint magic;
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public ushort major_ver;
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public ushort minor_ver;
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public uint log_sectorsize;
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public uint log_sectors_per_block;
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public uint log_blocksize;
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public uint log_blocks_per_seg;
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public uint segs_per_sec;
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public uint secs_per_zone;
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public uint checksum_offset;
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public ulong block_count;
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public uint section_count;
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public uint segment_count;
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public uint segment_count_ckpt;
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public uint segment_count_sit;
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public uint segment_count_nat;
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public uint segment_count_ssa;
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public uint segment_count_main;
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public uint segment0_blkaddr;
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public uint cp_blkaddr;
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public uint sit_blkaddr;
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public uint nat_blkaddr;
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public uint ssa_blkaddr;
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public uint main_blkaddr;
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public uint root_ino;
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public uint node_ino;
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public uint meta_ino;
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public Guid uuid;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 1024)]
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public byte[] volume_name;
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public uint extension_count;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)]
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public byte[] extension_list1;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)]
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public byte[] extension_list2;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)]
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public byte[] extension_list3;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)]
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public byte[] extension_list4;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)]
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public byte[] extension_list5;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)]
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public byte[] extension_list6;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)]
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public byte[] extension_list7;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)]
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public byte[] extension_list8;
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public uint cp_payload;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
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public byte[] version;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
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public byte[] init_version;
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public uint feature;
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public byte encryption_level;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
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public byte[] encrypt_pw_salt;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 871)]
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public byte[] reserved;
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}
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}
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} |