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Added support for the MicroDOS file system.
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238
DiscImageChef.Filesystems/MicroDOS.cs
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238
DiscImageChef.Filesystems/MicroDOS.cs
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// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : MicroDOS.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Component
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Description
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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.Collections.Generic;
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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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namespace DiscImageChef.Filesystems
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{
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// Information from http://www.owg.ru/mkt/BK/MKDOS.TXT
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// Thanks to tarlabnor for translating it
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public class MicroDOS : Filesystem
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{
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const ushort magic = 0xA72E;
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const ushort magic2 = 0x530C;
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public MicroDOS()
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{
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Name = "MicroDOS file system";
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PluginUUID = new Guid("9F9A364A-1A27-48A3-B730-7A7122000324");
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CurrentEncoding = Encoding.GetEncoding("koi8-r");
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}
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public MicroDOS(ImagePlugins.ImagePlugin imagePlugin, Partition partition, Encoding encoding)
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{
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Name = "MicroDOS file system";
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PluginUUID = new Guid("9F9A364A-1A27-48A3-B730-7A7122000324");
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if(encoding == null)
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CurrentEncoding = Encoding.GetEncoding("koi8-r");
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else
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CurrentEncoding = encoding;
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}
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public override bool Identify(ImagePlugins.ImagePlugin imagePlugin, Partition partition)
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{
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if((1 + partition.Start) >= partition.End)
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return false;
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if(imagePlugin.GetSectorSize() < 512)
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return false;
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MicroDOSBlock0 block0 = new MicroDOSBlock0();
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byte[] bk0 = imagePlugin.ReadSector(0 + partition.Start);
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GCHandle handle = GCHandle.Alloc(bk0, GCHandleType.Pinned);
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block0 = (MicroDOSBlock0)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(MicroDOSBlock0));
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handle.Free();
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return block0.label == magic && block0.mklabel == magic2;
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}
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public override void GetInformation(ImagePlugins.ImagePlugin imagePlugin, Partition partition, out string information)
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{
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information = "";
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StringBuilder sb = new StringBuilder();
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MicroDOSBlock0 block0 = new MicroDOSBlock0();
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byte[] bk0 = imagePlugin.ReadSector(0 + partition.Start);
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GCHandle handle = GCHandle.Alloc(bk0, GCHandleType.Pinned);
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block0 = (MicroDOSBlock0)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(MicroDOSBlock0));
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handle.Free();
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sb.AppendLine("MicroDOS filesystem");
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sb.AppendFormat("Volume has {0} blocks ({1} bytes)", block0.blocks, block0.blocks * 512).AppendLine();
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sb.AppendFormat("Volume has {0} blocks used ({1} bytes)", block0.usedBlocks, block0.usedBlocks * 512).AppendLine();
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sb.AppendFormat("Volume contains {0} files", block0.files).AppendLine();
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sb.AppendFormat("First used block is {0}", block0.firstUsedBlock).AppendLine();
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xmlFSType = new Schemas.FileSystemType
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{
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Type = "MicroDOS",
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ClusterSize = 512,
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Clusters = block0.blocks,
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Files = block0.files,
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FilesSpecified = true,
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FreeClusters = block0.blocks - block0.usedBlocks,
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FreeClustersSpecified = true
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};
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information = sb.ToString();
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}
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// Followed by directory entries
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct MicroDOSBlock0
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{
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/// <summary>BK starts booting here</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 24)]
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public byte[] bootCode;
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/// <summary>Number of files in directory</summary>
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public ushort files;
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/// <summary>Total number of blocks in files of the directory</summary>
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public ushort usedBlocks;
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/// <summary>Unknown</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 228)]
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public byte[] unknown;
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/// <summary>Ownership label (label that shows it belongs to Micro DOS format)</summary>
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public ushort label;
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/// <summary>MK-DOS directory format label</summary>
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public ushort mklabel;
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/// <summary>Unknown</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
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public byte[] unknown2;
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/// <summary>Disk size in blocks (absolute value for the system unlike NORD, NORTON etc.) that
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/// doesn't use two fixed values 40 or 80 tracks, but i.e. if you drive works with 76 tracks
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/// this field will contain an appropriate number of blocks</summary>
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public ushort blocks;
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/// <summary> Number of the first file's block. Value is changable</summary>
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public ushort firstUsedBlock;
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/// <summary>Unknown</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]
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public byte[] unknown3;
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct DirectoryEntry
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{
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/// <summary>File status</summary>
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public byte status;
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/// <summary>Directory number (0 - root)</summary>
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public byte directory;
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/// <summary>File name 14. symbols in ASCII KOI8</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
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public byte[] filename;
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/// <summary>Block number</summary>
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public ushort blockNo;
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/// <summary>Length in blocks</summary>
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public ushort blocks;
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/// <summary>Address</summary>
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public ushort address;
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/// <summary>Length</summary>
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public ushort length;
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}
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enum FileStatus : byte
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{
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CommonFile = 0,
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Protected = 1,
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LogicalDisk = 2,
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BadFile = 0x80,
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Deleted = 0xFF
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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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