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363 lines
16 KiB
C#
363 lines
16 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : MinixFS.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : MINIX filesystem plugin.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies the MINIX 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.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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// Information from the Linux kernel
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public class MinixFS : IFilesystem
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{
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/// <summary>Minix v1, 14 char filenames</summary>
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const ushort MINIX_MAGIC = 0x137F;
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/// <summary>Minix v1, 30 char filenames</summary>
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const ushort MINIX_MAGIC2 = 0x138F;
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/// <summary>Minix v2, 14 char filenames</summary>
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const ushort MINIX2_MAGIC = 0x2468;
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/// <summary>Minix v2, 30 char filenames</summary>
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const ushort MINIX2_MAGIC2 = 0x2478;
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/// <summary>Minix v3, 60 char filenames</summary>
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const ushort MINIX3_MAGIC = 0x4D5A;
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// Byteswapped
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/// <summary>Minix v1, 14 char filenames</summary>
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const ushort MINIX_CIGAM = 0x7F13;
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/// <summary>Minix v1, 30 char filenames</summary>
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const ushort MINIX_CIGAM2 = 0x8F13;
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/// <summary>Minix v2, 14 char filenames</summary>
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const ushort MINIX2_CIGAM = 0x6824;
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/// <summary>Minix v2, 30 char filenames</summary>
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const ushort MINIX2_CIGAM2 = 0x7824;
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/// <summary>Minix v3, 60 char filenames</summary>
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const ushort MINIX3_CIGAM = 0x5A4D;
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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 => "Minix Filesystem";
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public Guid Id => new Guid("FE248C3B-B727-4AE5-A39F-79EA9A07D4B3");
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public bool Identify(IMediaImage imagePlugin, Partition partition)
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{
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uint sector = 2;
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uint offset = 0;
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if(imagePlugin.Info.XmlMediaType == XmlMediaType.OpticalDisc)
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{
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sector = 0;
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offset = 0x400;
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}
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if(sector + partition.Start >= partition.End) return false;
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byte[] minixSbSector = imagePlugin.ReadSector(sector + partition.Start);
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// Optical media
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if(offset > 0)
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{
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byte[] tmp = new byte[0x200];
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Array.Copy(minixSbSector, offset, tmp, 0, 0x200);
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minixSbSector = tmp;
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}
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ushort magic = BitConverter.ToUInt16(minixSbSector, 0x010);
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if(magic == MINIX_MAGIC || magic == MINIX_MAGIC2 || magic == MINIX2_MAGIC || magic == MINIX2_MAGIC2 ||
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magic == MINIX_CIGAM || magic == MINIX_CIGAM2 || magic == MINIX2_CIGAM ||
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magic == MINIX2_CIGAM2) return true;
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magic = BitConverter.ToUInt16(minixSbSector, 0x018); // Here should reside magic number on Minix v3
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return magic == MINIX_MAGIC || magic == MINIX2_MAGIC || magic == MINIX3_MAGIC || magic == MINIX_CIGAM ||
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magic == MINIX2_CIGAM || magic == MINIX3_CIGAM;
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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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uint sector = 2;
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uint offset = 0;
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if(imagePlugin.Info.XmlMediaType == XmlMediaType.OpticalDisc)
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{
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sector = 0;
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offset = 0x400;
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}
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bool minix3 = false;
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int filenamesize;
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string minixVersion;
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byte[] minixSbSector = imagePlugin.ReadSector(sector + partition.Start);
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// Optical media
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if(offset > 0)
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{
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byte[] tmp = new byte[0x200];
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Array.Copy(minixSbSector, offset, tmp, 0, 0x200);
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minixSbSector = tmp;
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}
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ushort magic = BitConverter.ToUInt16(minixSbSector, 0x018);
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XmlFsType = new FileSystemType();
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bool littleEndian;
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if(magic == MINIX3_MAGIC || magic == MINIX3_CIGAM || magic == MINIX2_MAGIC || magic == MINIX2_CIGAM ||
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magic == MINIX_MAGIC || magic == MINIX_CIGAM)
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{
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filenamesize = 60;
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littleEndian = magic != MINIX3_CIGAM || magic == MINIX2_CIGAM || magic == MINIX_CIGAM;
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switch(magic)
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{
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case MINIX3_MAGIC:
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case MINIX3_CIGAM:
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minixVersion = "Minix v3 filesystem";
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XmlFsType.Type = "Minix v3";
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break;
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case MINIX2_MAGIC:
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case MINIX2_CIGAM:
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minixVersion = "Minix 3 v2 filesystem";
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XmlFsType.Type = "Minix 3 v2";
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break;
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default:
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minixVersion = "Minix 3 v1 filesystem";
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XmlFsType.Type = "Minix 3 v1";
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break;
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}
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minix3 = true;
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}
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else
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{
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magic = BitConverter.ToUInt16(minixSbSector, 0x010);
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switch(magic)
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{
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case MINIX_MAGIC:
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filenamesize = 14;
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minixVersion = "Minix v1 filesystem";
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littleEndian = true;
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XmlFsType.Type = "Minix v1";
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break;
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case MINIX_MAGIC2:
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filenamesize = 30;
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minixVersion = "Minix v1 filesystem";
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littleEndian = true;
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XmlFsType.Type = "Minix v1";
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break;
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case MINIX2_MAGIC:
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filenamesize = 14;
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minixVersion = "Minix v2 filesystem";
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littleEndian = true;
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XmlFsType.Type = "Minix v2";
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break;
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case MINIX2_MAGIC2:
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filenamesize = 30;
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minixVersion = "Minix v2 filesystem";
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littleEndian = true;
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XmlFsType.Type = "Minix v2";
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break;
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case MINIX_CIGAM:
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filenamesize = 14;
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minixVersion = "Minix v1 filesystem";
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littleEndian = false;
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XmlFsType.Type = "Minix v1";
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break;
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case MINIX_CIGAM2:
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filenamesize = 30;
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minixVersion = "Minix v1 filesystem";
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littleEndian = false;
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XmlFsType.Type = "Minix v1";
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break;
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case MINIX2_CIGAM:
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filenamesize = 14;
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minixVersion = "Minix v2 filesystem";
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littleEndian = false;
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XmlFsType.Type = "Minix v2";
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break;
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case MINIX2_CIGAM2:
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filenamesize = 30;
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minixVersion = "Minix v2 filesystem";
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littleEndian = false;
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XmlFsType.Type = "Minix v2";
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break;
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default: return;
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}
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}
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if(minix3)
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{
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Minix3SuperBlock mnxSb;
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if(littleEndian)
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{
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GCHandle handle = GCHandle.Alloc(minixSbSector, GCHandleType.Pinned);
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mnxSb = (Minix3SuperBlock)Marshal.PtrToStructure(handle.AddrOfPinnedObject(),
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typeof(Minix3SuperBlock));
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handle.Free();
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}
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else mnxSb = BigEndianMarshal.ByteArrayToStructureBigEndian<Minix3SuperBlock>(minixSbSector);
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if(magic != MINIX3_MAGIC && magic != MINIX3_CIGAM) mnxSb.s_blocksize = 1024;
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sb.AppendLine(minixVersion);
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sb.AppendFormat("{0} chars in filename", filenamesize).AppendLine();
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if(mnxSb.s_zones > 0) // On V2
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sb.AppendFormat("{0} zones on volume ({1} bytes)", mnxSb.s_zones, mnxSb.s_zones * 1024)
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.AppendLine();
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else
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sb.AppendFormat("{0} zones on volume ({1} bytes)", mnxSb.s_nzones, mnxSb.s_nzones * 1024)
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.AppendLine();
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sb.AppendFormat("{0} bytes/block", mnxSb.s_blocksize).AppendLine();
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sb.AppendFormat("{0} inodes on volume", mnxSb.s_ninodes).AppendLine();
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sb.AppendFormat("{0} blocks on inode map ({1} bytes)", mnxSb.s_imap_blocks,
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mnxSb.s_imap_blocks * mnxSb.s_blocksize).AppendLine();
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sb.AppendFormat("{0} blocks on zone map ({1} bytes)", mnxSb.s_zmap_blocks,
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mnxSb.s_zmap_blocks * mnxSb.s_blocksize).AppendLine();
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sb.AppendFormat("First data zone: {0}", mnxSb.s_firstdatazone).AppendLine();
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//sb.AppendFormat("log2 of blocks/zone: {0}", mnx_sb.s_log_zone_size).AppendLine(); // Apparently 0
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sb.AppendFormat("{0} bytes maximum per file", mnxSb.s_max_size).AppendLine();
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sb.AppendFormat("On-disk filesystem version: {0}", mnxSb.s_disk_version).AppendLine();
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XmlFsType.ClusterSize = mnxSb.s_blocksize;
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XmlFsType.Clusters = mnxSb.s_zones > 0 ? mnxSb.s_zones : mnxSb.s_nzones;
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}
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else
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{
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MinixSuperBlock mnxSb;
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if(littleEndian)
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{
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GCHandle handle = GCHandle.Alloc(minixSbSector, GCHandleType.Pinned);
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mnxSb = (MinixSuperBlock)Marshal.PtrToStructure(handle.AddrOfPinnedObject(),
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typeof(MinixSuperBlock));
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handle.Free();
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}
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else mnxSb = BigEndianMarshal.ByteArrayToStructureBigEndian<MinixSuperBlock>(minixSbSector);
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sb.AppendLine(minixVersion);
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sb.AppendFormat("{0} chars in filename", filenamesize).AppendLine();
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if(mnxSb.s_zones > 0) // On V2
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sb.AppendFormat("{0} zones on volume ({1} bytes)", mnxSb.s_zones, mnxSb.s_zones * 1024)
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.AppendLine();
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else
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sb.AppendFormat("{0} zones on volume ({1} bytes)", mnxSb.s_nzones, mnxSb.s_nzones * 1024)
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.AppendLine();
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sb.AppendFormat("{0} inodes on volume", mnxSb.s_ninodes).AppendLine();
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sb.AppendFormat("{0} blocks on inode map ({1} bytes)", mnxSb.s_imap_blocks, mnxSb.s_imap_blocks * 1024)
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.AppendLine();
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sb.AppendFormat("{0} blocks on zone map ({1} bytes)", mnxSb.s_zmap_blocks, mnxSb.s_zmap_blocks * 1024)
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.AppendLine();
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sb.AppendFormat("First data zone: {0}", mnxSb.s_firstdatazone).AppendLine();
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//sb.AppendFormat("log2 of blocks/zone: {0}", mnx_sb.s_log_zone_size).AppendLine(); // Apparently 0
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sb.AppendFormat("{0} bytes maximum per file", mnxSb.s_max_size).AppendLine();
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sb.AppendFormat("Filesystem state: {0:X4}", mnxSb.s_state).AppendLine();
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XmlFsType.ClusterSize = 1024;
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XmlFsType.Clusters = mnxSb.s_zones > 0 ? mnxSb.s_zones : mnxSb.s_nzones;
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}
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information = sb.ToString();
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}
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/// <summary>
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/// Superblock for Minix v1 and V2 filesystems
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/// </summary>
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct MinixSuperBlock
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{
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/// <summary>0x00, inodes on volume</summary>
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public ushort s_ninodes;
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/// <summary>0x02, zones on volume</summary>
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public ushort s_nzones;
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/// <summary>0x04, blocks on inode map</summary>
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public short s_imap_blocks;
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/// <summary>0x06, blocks on zone map</summary>
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public short s_zmap_blocks;
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/// <summary>0x08, first data zone</summary>
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public ushort s_firstdatazone;
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/// <summary>0x0A, log2 of blocks/zone</summary>
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public short s_log_zone_size;
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/// <summary>0x0C, max file size</summary>
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public uint s_max_size;
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/// <summary>0x10, magic</summary>
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public ushort s_magic;
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/// <summary>0x12, filesystem state</summary>
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public ushort s_state;
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/// <summary>0x14, number of zones</summary>
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public uint s_zones;
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}
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/// <summary>
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/// Superblock for Minix v3 filesystems
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/// </summary>
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct Minix3SuperBlock
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{
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/// <summary>0x00, inodes on volume</summary>
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public uint s_ninodes;
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/// <summary>0x02, old zones on volume</summary>
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public ushort s_nzones;
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/// <summary>0x06, blocks on inode map</summary>
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public ushort s_imap_blocks;
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/// <summary>0x08, blocks on zone map</summary>
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public ushort s_zmap_blocks;
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/// <summary>0x0A, first data zone</summary>
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public ushort s_firstdatazone;
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/// <summary>0x0C, log2 of blocks/zone</summary>
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public ushort s_log_zone_size;
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/// <summary>0x0E, padding</summary>
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public ushort s_pad1;
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/// <summary>0x10, max file size</summary>
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public uint s_max_size;
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/// <summary>0x14, number of zones</summary>
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public uint s_zones;
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/// <summary>0x18, magic</summary>
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public ushort s_magic;
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/// <summary>0x1A, padding</summary>
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public ushort s_pad2;
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/// <summary>0x1C, bytes in a block</summary>
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public ushort s_blocksize;
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/// <summary>0x1E, on-disk structures version</summary>
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public byte s_disk_version;
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}
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}
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} |