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373 lines
16 KiB
C#
373 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 © 2011-2017 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.Text;
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using System.Collections.Generic;
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namespace DiscImageChef.Filesystems
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{
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// Information from the Linux kernel
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class MinixFS : Filesystem
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{
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const ushort MINIX_MAGIC = 0x137F;
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// Minix v1, 14 char filenames
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const ushort MINIX_MAGIC2 = 0x138F;
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// Minix v1, 30 char filenames
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const ushort MINIX2_MAGIC = 0x2468;
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// Minix v2, 14 char filenames
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const ushort MINIX2_MAGIC2 = 0x2478;
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// Minix v2, 30 char filenames
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const ushort MINIX3_MAGIC = 0x4D5A;
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// Minix v3, 60 char filenames
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// Byteswapped
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const ushort MINIX_CIGAM = 0x7F13;
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// Minix v1, 14 char filenames
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const ushort MINIX_CIGAM2 = 0x8F13;
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// Minix v1, 30 char filenames
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const ushort MINIX2_CIGAM = 0x6824;
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// Minix v2, 14 char filenames
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const ushort MINIX2_CIGAM2 = 0x7824;
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// Minix v2, 30 char filenames
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const ushort MINIX3_CIGAM = 0x5A4D;
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// Minix v3, 60 char filenames
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public MinixFS()
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{
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Name = "Minix Filesystem";
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PluginUUID = new Guid("FE248C3B-B727-4AE5-A39F-79EA9A07D4B3");
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CurrentEncoding = Encoding.GetEncoding("iso-8859-15");
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}
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public MinixFS(ImagePlugins.ImagePlugin imagePlugin, ulong partitionStart, ulong partitionEnd, Encoding encoding)
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{
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Name = "Minix Filesystem";
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PluginUUID = new Guid("FE248C3B-B727-4AE5-A39F-79EA9A07D4B3");
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if(encoding == null)
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CurrentEncoding = Encoding.GetEncoding("iso-8859-15");
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}
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public override bool Identify(ImagePlugins.ImagePlugin imagePlugin, ulong partitionStart, ulong partitionEnd)
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{
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if((2 + partitionStart) >= partitionEnd)
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return false;
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ushort magic;
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byte[] minix_sb_sector = imagePlugin.ReadSector(2 + partitionStart);
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magic = BitConverter.ToUInt16(minix_sb_sector, 0x010); // Here should reside magic number on Minix V1 & V2
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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 || magic == MINIX2_CIGAM2)
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return true;
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magic = BitConverter.ToUInt16(minix_sb_sector, 0x018); // Here should reside magic number on Minix V3
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if(magic == MINIX3_MAGIC || magic == MINIX3_CIGAM)
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return true;
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return false;
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}
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public override void GetInformation(ImagePlugins.ImagePlugin imagePlugin, ulong partitionStart, ulong partitionEnd, out string information)
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{
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information = "";
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StringBuilder sb = new StringBuilder();
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bool minix3 = false;
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int filenamesize;
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string minixVersion;
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ushort magic;
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byte[] minix_sb_sector = imagePlugin.ReadSector(2 + partitionStart);
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magic = BigEndianBitConverter.ToUInt16(minix_sb_sector, 0x018);
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xmlFSType = new Schemas.FileSystemType();
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if(magic == MINIX3_MAGIC || magic == MINIX3_CIGAM)
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{
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filenamesize = 60;
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minixVersion = "Minix V3 filesystem";
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BigEndianBitConverter.IsLittleEndian = magic != MINIX3_CIGAM;
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xmlFSType.Type = "Minix V3";
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minix3 = true;
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}
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else
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{
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magic = BigEndianBitConverter.ToUInt16(minix_sb_sector, 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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BigEndianBitConverter.IsLittleEndian = 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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BigEndianBitConverter.IsLittleEndian = 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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BigEndianBitConverter.IsLittleEndian = 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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BigEndianBitConverter.IsLittleEndian = 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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BigEndianBitConverter.IsLittleEndian = 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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BigEndianBitConverter.IsLittleEndian = 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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BigEndianBitConverter.IsLittleEndian = 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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BigEndianBitConverter.IsLittleEndian = false;
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xmlFSType.Type = "Minix V2";
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break;
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default:
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return;
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}
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}
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if(minix3)
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{
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Minix3SuperBlock mnx_sb = new Minix3SuperBlock();
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mnx_sb.s_ninodes = BigEndianBitConverter.ToUInt32(minix_sb_sector, 0x00);
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mnx_sb.s_pad0 = BigEndianBitConverter.ToUInt16(minix_sb_sector, 0x04);
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mnx_sb.s_imap_blocks = BigEndianBitConverter.ToUInt16(minix_sb_sector, 0x06);
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mnx_sb.s_zmap_blocks = BigEndianBitConverter.ToUInt16(minix_sb_sector, 0x08);
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mnx_sb.s_firstdatazone = BigEndianBitConverter.ToUInt16(minix_sb_sector, 0x0A);
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mnx_sb.s_log_zone_size = BigEndianBitConverter.ToUInt16(minix_sb_sector, 0x0C);
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mnx_sb.s_pad1 = BigEndianBitConverter.ToUInt16(minix_sb_sector, 0x0E);
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mnx_sb.s_max_size = BigEndianBitConverter.ToUInt32(minix_sb_sector, 0x10);
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mnx_sb.s_zones = BigEndianBitConverter.ToUInt32(minix_sb_sector, 0x14);
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mnx_sb.s_magic = BigEndianBitConverter.ToUInt16(minix_sb_sector, 0x18);
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mnx_sb.s_pad2 = BigEndianBitConverter.ToUInt16(minix_sb_sector, 0x1A);
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mnx_sb.s_blocksize = BigEndianBitConverter.ToUInt16(minix_sb_sector, 0x1C);
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mnx_sb.s_disk_version = minix_sb_sector[0x1E];
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sb.AppendLine(minixVersion);
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sb.AppendFormat("{0} chars in filename", filenamesize).AppendLine();
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sb.AppendFormat("{0} zones on volume ({1} bytes)", mnx_sb.s_zones, mnx_sb.s_zones * mnx_sb.s_blocksize).AppendLine();
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sb.AppendFormat("{0} bytes/block", mnx_sb.s_blocksize).AppendLine();
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sb.AppendFormat("{0} inodes on volume", mnx_sb.s_ninodes).AppendLine();
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sb.AppendFormat("{0} blocks on inode map ({1} bytes)", mnx_sb.s_imap_blocks, mnx_sb.s_imap_blocks * mnx_sb.s_blocksize).AppendLine();
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sb.AppendFormat("{0} blocks on zone map ({1} bytes)", mnx_sb.s_zmap_blocks, mnx_sb.s_zmap_blocks * mnx_sb.s_blocksize).AppendLine();
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sb.AppendFormat("First data zone: {0}", mnx_sb.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", mnx_sb.s_max_size).AppendLine();
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sb.AppendFormat("On-disk filesystem version: {0}", mnx_sb.s_disk_version).AppendLine();
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xmlFSType.ClusterSize = mnx_sb.s_blocksize;
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xmlFSType.Clusters = (long)((partitionEnd - partitionStart + 1) * imagePlugin.GetSectorSize() / mnx_sb.s_blocksize);
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}
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else
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{
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MinixSuperBlock mnx_sb = new MinixSuperBlock();
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mnx_sb.s_ninodes = BigEndianBitConverter.ToUInt16(minix_sb_sector, 0x00);
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mnx_sb.s_nzones = BigEndianBitConverter.ToUInt16(minix_sb_sector, 0x02);
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mnx_sb.s_imap_blocks = BigEndianBitConverter.ToUInt16(minix_sb_sector, 0x04);
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mnx_sb.s_zmap_blocks = BigEndianBitConverter.ToUInt16(minix_sb_sector, 0x06);
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mnx_sb.s_firstdatazone = BigEndianBitConverter.ToUInt16(minix_sb_sector, 0x08);
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mnx_sb.s_log_zone_size = BigEndianBitConverter.ToUInt16(minix_sb_sector, 0x0A);
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mnx_sb.s_max_size = BigEndianBitConverter.ToUInt32(minix_sb_sector, 0x0C);
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mnx_sb.s_magic = BigEndianBitConverter.ToUInt16(minix_sb_sector, 0x10);
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mnx_sb.s_state = BigEndianBitConverter.ToUInt16(minix_sb_sector, 0x12);
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mnx_sb.s_zones = BigEndianBitConverter.ToUInt32(minix_sb_sector, 0x14);
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sb.AppendLine(minixVersion);
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sb.AppendFormat("{0} chars in filename", filenamesize).AppendLine();
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if(mnx_sb.s_zones > 0) // On V2
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sb.AppendFormat("{0} zones on volume ({1} bytes)", mnx_sb.s_zones, mnx_sb.s_zones * 1024).AppendLine();
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else
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sb.AppendFormat("{0} zones on volume ({1} bytes)", mnx_sb.s_nzones, mnx_sb.s_nzones * 1024).AppendLine();
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sb.AppendFormat("{0} inodes on volume", mnx_sb.s_ninodes).AppendLine();
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sb.AppendFormat("{0} blocks on inode map ({1} bytes)", mnx_sb.s_imap_blocks, mnx_sb.s_imap_blocks * 1024).AppendLine();
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sb.AppendFormat("{0} blocks on zone map ({1} bytes)", mnx_sb.s_zmap_blocks, mnx_sb.s_zmap_blocks * 1024).AppendLine();
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sb.AppendFormat("First data zone: {0}", mnx_sb.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", mnx_sb.s_max_size).AppendLine();
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sb.AppendFormat("Filesystem state: {0:X4}", mnx_sb.s_state).AppendLine();
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xmlFSType.ClusterSize = 1024;
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xmlFSType.Clusters = (long)((partitionEnd - partitionStart + 1) * imagePlugin.GetSectorSize() / 1024);
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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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public 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 ushort s_imap_blocks;
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/// <summary>0x06, blocks on zone map</summary>
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public ushort 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 ushort 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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public 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>0x04, padding</summary>
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public ushort s_pad0;
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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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public override Errno Mount()
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{
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return Errno.NotImplemented;
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}
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public override Errno Mount(bool debug)
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{
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return Errno.NotImplemented;
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}
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public override Errno Unmount()
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{
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return Errno.NotImplemented;
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}
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public override Errno MapBlock(string path, long fileBlock, ref long deviceBlock)
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{
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return Errno.NotImplemented;
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}
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public override Errno GetAttributes(string path, ref FileAttributes attributes)
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{
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return Errno.NotImplemented;
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}
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public override Errno ListXAttr(string path, ref List<string> xattrs)
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{
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return Errno.NotImplemented;
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}
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public override Errno GetXattr(string path, string xattr, ref byte[] buf)
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{
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return Errno.NotImplemented;
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}
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public override Errno Read(string path, long offset, long size, ref byte[] buf)
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{
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return Errno.NotImplemented;
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}
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public override Errno ReadDir(string path, ref List<string> contents)
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{
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return Errno.NotImplemented;
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}
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public override Errno StatFs(ref FileSystemInfo stat)
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{
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return Errno.NotImplemented;
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}
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public override Errno Stat(string path, ref FileEntryInfo stat)
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{
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return Errno.NotImplemented;
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}
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public override Errno ReadLink(string path, ref string dest)
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{
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return Errno.NotImplemented;
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}
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}
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}
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