// /*************************************************************************** // The Disc Image Chef // ---------------------------------------------------------------------------- // // Filename : NILFS2.cs // Author(s) : Natalia Portillo // // Component : NILFS2 filesystem plugin. // // --[ Description ] ---------------------------------------------------------- // // Identifies the NILFS2 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.Runtime.InteropServices; using System.Text; using DiscImageChef.CommonTypes; using DiscImageChef.CommonTypes.Interfaces; using Schemas; using Marshal = DiscImageChef.Helpers.Marshal; namespace DiscImageChef.Filesystems { public class NILFS2 : IFilesystem { const ushort NILFS2_MAGIC = 0x3434; const uint NILFS2_SUPER_OFFSET = 1024; public FileSystemType XmlFsType { get; private set; } public Encoding Encoding { get; private set; } public string Name => "NILFS2 Plugin"; public Guid Id => new Guid("35224226-C5CC-48B5-8FFD-3781E91E86B6"); public string Author => "Natalia Portillo"; public bool Identify(IMediaImage imagePlugin, Partition partition) { if(imagePlugin.Info.SectorSize < 512) return false; uint sbAddr = NILFS2_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 + sbSize >= partition.End) return false; byte[] sector = imagePlugin.ReadSectors(partition.Start + sbAddr, sbSize); if(sector.Length < Marshal.SizeOf()) return false; NILFS2_Superblock nilfsSb = Marshal.ByteArrayToStructureLittleEndian(sector); return nilfsSb.magic == NILFS2_MAGIC; } public void GetInformation(IMediaImage imagePlugin, Partition partition, out string information, Encoding encoding) { Encoding = encoding ?? Encoding.UTF8; information = ""; if(imagePlugin.Info.SectorSize < 512) return; uint sbAddr = NILFS2_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; NILFS2_Superblock nilfsSb = Marshal.ByteArrayToStructureLittleEndian(sector); if(nilfsSb.magic != NILFS2_MAGIC) return; StringBuilder sb = new StringBuilder(); sb.AppendLine("NILFS2 filesystem"); sb.AppendFormat("Version {0}.{1}", nilfsSb.rev_level, nilfsSb.minor_rev_level).AppendLine(); sb.AppendFormat("{0} bytes per block", 1 << (int)(nilfsSb.log_block_size + 10)).AppendLine(); sb.AppendFormat("{0} bytes in volume", nilfsSb.dev_size).AppendLine(); sb.AppendFormat("{0} blocks per segment", nilfsSb.blocks_per_segment).AppendLine(); sb.AppendFormat("{0} segments", nilfsSb.nsegments).AppendLine(); if(nilfsSb.creator_os == 0) sb.AppendLine("Filesystem created on Linux"); else sb.AppendFormat("Creator OS code: {0}", nilfsSb.creator_os).AppendLine(); sb.AppendFormat("{0} bytes per inode", nilfsSb.inode_size).AppendLine(); sb.AppendFormat("Volume UUID: {0}", nilfsSb.uuid).AppendLine(); sb.AppendFormat("Volume name: {0}", StringHandlers.CToString(nilfsSb.volume_name, Encoding)).AppendLine(); sb.AppendFormat("Volume created on {0}", DateHandlers.UnixUnsignedToDateTime(nilfsSb.ctime)).AppendLine(); sb.AppendFormat("Volume last mounted on {0}", DateHandlers.UnixUnsignedToDateTime(nilfsSb.mtime)) .AppendLine(); sb.AppendFormat("Volume last written on {0}", DateHandlers.UnixUnsignedToDateTime(nilfsSb.wtime)) .AppendLine(); information = sb.ToString(); XmlFsType = new FileSystemType { Type = "NILFS2 filesystem", ClusterSize = (uint)(1 << (int)(nilfsSb.log_block_size + 10)), VolumeName = StringHandlers.CToString(nilfsSb.volume_name, Encoding), VolumeSerial = nilfsSb.uuid.ToString(), CreationDate = DateHandlers.UnixUnsignedToDateTime(nilfsSb.ctime), CreationDateSpecified = true, ModificationDate = DateHandlers.UnixUnsignedToDateTime(nilfsSb.wtime), ModificationDateSpecified = true }; if(nilfsSb.creator_os == 0) XmlFsType.SystemIdentifier = "Linux"; XmlFsType.Clusters = nilfsSb.dev_size / XmlFsType.ClusterSize; } enum NILFS2_State : ushort { Valid = 0x0001, Error = 0x0002, Resize = 0x0004 } [StructLayout(LayoutKind.Sequential, Pack = 1)] struct NILFS2_Superblock { public readonly uint rev_level; public readonly ushort minor_rev_level; public readonly ushort magic; public readonly ushort bytes; public readonly ushort flags; public readonly uint crc_seed; public readonly uint sum; public readonly uint log_block_size; public readonly ulong nsegments; public readonly ulong dev_size; public readonly ulong first_data_block; public readonly uint blocks_per_segment; public readonly uint r_segments_percentage; public readonly ulong last_cno; public readonly ulong last_pseg; public readonly ulong last_seq; public readonly ulong free_blocks_count; public readonly ulong ctime; public readonly ulong mtime; public readonly ulong wtime; public readonly ushort mnt_count; public readonly ushort max_mnt_count; public readonly NILFS2_State state; public readonly ushort errors; public readonly ulong lastcheck; public readonly uint checkinterval; public readonly uint creator_os; public readonly ushort def_resuid; public readonly ushort def_resgid; public readonly uint first_ino; public readonly ushort inode_size; public readonly ushort dat_entry_size; public readonly ushort checkpoint_size; public readonly ushort segment_usage_size; public readonly Guid uuid; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 80)] public readonly byte[] volume_name; public readonly uint c_interval; public readonly uint c_block_max; public readonly ulong feature_compat; public readonly ulong feature_compat_ro; public readonly ulong feature_incompat; } } }