// /*************************************************************************** // The Disc Image Chef // ---------------------------------------------------------------------------- // // Filename : F2FS.cs // Author(s) : Natalia Portillo // // Component : F2FS filesystem plugin. // // --[ Description ] ---------------------------------------------------------- // // Identifies the F2FS filesystem and shows information. // // --[ License ] -------------------------------------------------------------- // // This library is free software; you can redistribute it and/or modify // it under the terms of the GNU Lesser General Public License as // published by the Free Software Foundation; either version 2.1 of the // License, or (at your option) any later version. // // This library is distributed in the hope that it will be useful, but // WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU // Lesser General Public License for more details. // // You should have received a copy of the GNU Lesser General Public // License along with this library; if not, see . // // ---------------------------------------------------------------------------- // Copyright © 2011-2019 Natalia Portillo // ****************************************************************************/ using System; using System.Diagnostics.CodeAnalysis; using System.Runtime.InteropServices; using System.Text; using DiscImageChef.CommonTypes; using DiscImageChef.CommonTypes.Interfaces; using Schemas; using Marshal = DiscImageChef.Helpers.Marshal; namespace DiscImageChef.Filesystems { public class F2FS : IFilesystem { const uint F2FS_MAGIC = 0xF2F52010; const uint F2FS_SUPER_OFFSET = 1024; const uint F2FS_MIN_SECTOR = 512; const uint F2FS_MAX_SECTOR = 4096; const uint F2FS_BLOCK_SIZE = 4096; public FileSystemType XmlFsType { get; private set; } public Encoding Encoding { get; private set; } public string Name => "F2FS Plugin"; public Guid Id => new Guid("82B0920F-5F0D-4063-9F57-ADE0AE02ECE5"); public string Author => "Natalia Portillo"; public bool Identify(IMediaImage imagePlugin, Partition partition) { if(imagePlugin.Info.SectorSize < F2FS_MIN_SECTOR || imagePlugin.Info.SectorSize > F2FS_MAX_SECTOR) return false; uint sbAddr = F2FS_SUPER_OFFSET / imagePlugin.Info.SectorSize; if(sbAddr == 0) sbAddr = 1; uint sbSize = (uint)(Marshal.SizeOf() / imagePlugin.Info.SectorSize); if(Marshal.SizeOf() % imagePlugin.Info.SectorSize != 0) sbSize++; if(partition.Start + sbAddr >= partition.End) return false; byte[] sector = imagePlugin.ReadSectors(partition.Start + sbAddr, sbSize); if(sector.Length < Marshal.SizeOf()) return false; F2FS_Superblock f2fsSb = Marshal.ByteArrayToStructureLittleEndian(sector); return f2fsSb.magic == F2FS_MAGIC; } public void GetInformation(IMediaImage imagePlugin, Partition partition, out string information, Encoding encoding) { Encoding = Encoding.Unicode; information = ""; if(imagePlugin.Info.SectorSize < F2FS_MIN_SECTOR || imagePlugin.Info.SectorSize > F2FS_MAX_SECTOR) return; uint sbAddr = F2FS_SUPER_OFFSET / imagePlugin.Info.SectorSize; if(sbAddr == 0) sbAddr = 1; uint sbSize = (uint)(Marshal.SizeOf() / imagePlugin.Info.SectorSize); if(Marshal.SizeOf() % imagePlugin.Info.SectorSize != 0) sbSize++; byte[] sector = imagePlugin.ReadSectors(partition.Start + sbAddr, sbSize); if(sector.Length < Marshal.SizeOf()) return; F2FS_Superblock f2fsSb = Marshal.ByteArrayToStructureLittleEndian(sector); if(f2fsSb.magic != F2FS_MAGIC) return; StringBuilder sb = new StringBuilder(); sb.AppendLine("F2FS filesystem"); sb.AppendFormat("Version {0}.{1}", f2fsSb.major_ver, f2fsSb.minor_ver).AppendLine(); sb.AppendFormat("{0} bytes per sector", 1 << (int)f2fsSb.log_sectorsize).AppendLine(); sb.AppendFormat("{0} sectors ({1} bytes) per block", 1 << (int)f2fsSb.log_sectors_per_block, 1 << (int)f2fsSb.log_blocksize).AppendLine(); sb.AppendFormat("{0} blocks per segment", f2fsSb.log_blocks_per_seg).AppendLine(); sb.AppendFormat("{0} blocks in volume", f2fsSb.block_count).AppendLine(); sb.AppendFormat("{0} segments per section", f2fsSb.segs_per_sec).AppendLine(); sb.AppendFormat("{0} sections per zone", f2fsSb.secs_per_zone).AppendLine(); sb.AppendFormat("{0} sections", f2fsSb.section_count).AppendLine(); sb.AppendFormat("{0} segments", f2fsSb.segment_count).AppendLine(); sb.AppendFormat("Root directory resides on inode {0}", f2fsSb.root_ino).AppendLine(); sb.AppendFormat("Volume UUID: {0}", f2fsSb.uuid).AppendLine(); sb.AppendFormat("Volume name: {0}", StringHandlers.CToString(f2fsSb.volume_name, Encoding.Unicode, true)) .AppendLine(); sb.AppendFormat("Volume last mounted on kernel version: {0}", StringHandlers.CToString(f2fsSb.version)) .AppendLine(); sb.AppendFormat("Volume created on kernel version: {0}", StringHandlers.CToString(f2fsSb.init_version)) .AppendLine(); information = sb.ToString(); XmlFsType = new FileSystemType { Type = "F2FS filesystem", SystemIdentifier = Encoding.ASCII.GetString(f2fsSb.version), Clusters = f2fsSb.block_count, ClusterSize = (uint)(1 << (int)f2fsSb.log_blocksize), DataPreparerIdentifier = Encoding.ASCII.GetString(f2fsSb.init_version), VolumeName = StringHandlers.CToString(f2fsSb.volume_name, Encoding.Unicode, true), VolumeSerial = f2fsSb.uuid.ToString() }; } [StructLayout(LayoutKind.Sequential, Pack = 1)] [SuppressMessage("ReSharper", "InconsistentNaming")] struct F2FS_Superblock { public readonly uint magic; public readonly ushort major_ver; public readonly ushort minor_ver; public readonly uint log_sectorsize; public readonly uint log_sectors_per_block; public readonly uint log_blocksize; public readonly uint log_blocks_per_seg; public readonly uint segs_per_sec; public readonly uint secs_per_zone; public readonly uint checksum_offset; public readonly ulong block_count; public readonly uint section_count; public readonly uint segment_count; public readonly uint segment_count_ckpt; public readonly uint segment_count_sit; public readonly uint segment_count_nat; public readonly uint segment_count_ssa; public readonly uint segment_count_main; public readonly uint segment0_blkaddr; public readonly uint cp_blkaddr; public readonly uint sit_blkaddr; public readonly uint nat_blkaddr; public readonly uint ssa_blkaddr; public readonly uint main_blkaddr; public readonly uint root_ino; public readonly uint node_ino; public readonly uint meta_ino; public readonly Guid uuid; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 1024)] public readonly byte[] volume_name; public readonly uint extension_count; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)] public readonly byte[] extension_list1; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)] public readonly byte[] extension_list2; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)] public readonly byte[] extension_list3; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)] public readonly byte[] extension_list4; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)] public readonly byte[] extension_list5; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)] public readonly byte[] extension_list6; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)] public readonly byte[] extension_list7; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 64)] public readonly byte[] extension_list8; public readonly uint cp_payload; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)] public readonly byte[] version; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)] public readonly byte[] init_version; public readonly uint feature; public readonly byte encryption_level; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)] public readonly byte[] encrypt_pw_salt; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 871)] public readonly byte[] reserved; } } }