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245 lines
9.3 KiB
C#
245 lines
9.3 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : RT11.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : RT-11 file system plugin.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies the RT-11 file system 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.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.trailing-edge.com/~shoppa/rt11fs/
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// TODO: Implement Radix-50
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public class RT11 : Filesystem
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{
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public RT11()
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{
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Name = "RT-11 file system";
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PluginUUID = new Guid("DB3E2F98-8F98-463C-8126-E937843DA024");
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CurrentEncoding = Encoding.GetEncoding("iso-8859-1");
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}
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public RT11(Encoding encoding)
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{
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Name = "RT-11 file system";
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PluginUUID = new Guid("DB3E2F98-8F98-463C-8126-E937843DA024");
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if(encoding == null)
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CurrentEncoding = Encoding.GetEncoding("iso-8859-1");
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else
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CurrentEncoding = encoding;
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}
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public RT11(ImagePlugins.ImagePlugin imagePlugin, Partition partition, Encoding encoding)
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{
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Name = "RT-11 file system";
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PluginUUID = new Guid("DB3E2F98-8F98-463C-8126-E937843DA024");
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if(encoding == null)
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CurrentEncoding = Encoding.GetEncoding("iso-8859-1");
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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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byte[] magic_b = new byte[12];
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string magic;
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byte[] hb_sector = imagePlugin.ReadSector(1 + partition.Start);
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Array.Copy(hb_sector, 0x1F0, magic_b, 0, 12);
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magic = Encoding.ASCII.GetString(magic_b);
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return magic == "DECRT11A ";
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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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RT11HomeBlock homeblock = new RT11HomeBlock();
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byte[] hb_sector = imagePlugin.ReadSector(1 + partition.Start);
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GCHandle handle = GCHandle.Alloc(hb_sector, GCHandleType.Pinned);
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homeblock = (RT11HomeBlock)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(RT11HomeBlock));
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handle.Free();
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/* TODO: Is this correct?
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* Assembler:
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* MOV address, R0
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* CLR R1
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* MOV #255., R2
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* 10$: ADD (R0)+, R1
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* SOB R2, 10$
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* MOV 1,@R0
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*/
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ushort check = 0;
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for(int i = 0; i < 512; i += 2)
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check += BitConverter.ToUInt16(hb_sector, i);
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sb.AppendFormat("Volume format is {0}", StringHandlers.SpacePaddedToString(homeblock.format, CurrentEncoding)).AppendLine();
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sb.AppendFormat("{0} sectors per cluster ({1} bytes)", homeblock.cluster, homeblock.cluster * 512).AppendLine();
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sb.AppendFormat("First directory segment starts at block {0}", homeblock.rootBlock).AppendLine();
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sb.AppendFormat("Volume owner is \"{0}\"", StringHandlers.SpacePaddedToString(homeblock.ownername, CurrentEncoding)).AppendLine();
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sb.AppendFormat("Volume label: \"{0}\"", StringHandlers.SpacePaddedToString(homeblock.volname, CurrentEncoding)).AppendLine();
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sb.AppendFormat("Checksum: 0x{0:X4} (calculated 0x{1:X4})", homeblock.checksum, check).AppendLine();
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byte[] bootBlock = imagePlugin.ReadSector(0);
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xmlFSType = new Schemas.FileSystemType
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{
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Type = "RT-11",
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ClusterSize = homeblock.cluster * 512,
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Clusters = homeblock.cluster,
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VolumeName = StringHandlers.SpacePaddedToString(homeblock.volname, CurrentEncoding),
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Bootable = !ArrayHelpers.ArrayIsNullOrEmpty(bootBlock)
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};
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information = sb.ToString();
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct RT11HomeBlock
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{
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/// <summary>Bad block replacement table</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 130)]
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public byte[] badBlockTable;
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/// <summary>Unused</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
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public byte[] unused;
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/// <summary>INITIALIZE/RESTORE data area</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 38)]
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public byte[] initArea;
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/// <summary>BUP information area</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 18)]
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public byte[] bupInformation;
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/// <summary>Empty</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 260)]
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public byte[] empty;
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/// <summary>Reserved</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
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public byte[] reserved1;
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/// <summary>Reserved</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
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public byte[] reserved2;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 14)]
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public byte[] empty2;
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/// <summary>Cluster size</summary>
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public ushort cluster;
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/// <summary>Block of the first directory segment</summary>
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public ushort rootBlock;
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/// <summary>"V3A" in Radix-50</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
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public byte[] systemVersion;
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/// <summary>Name of the volume, 12 bytes</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
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public byte[] volname;
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/// <summary>Name of the volume owner, 12 bytes</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
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public byte[] ownername;
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/// <summary>RT11 defines it as "DECRT11A ", 12 bytes</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
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public byte[] format;
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/// <summary>Unused</summary>
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public ushort unused2;
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/// <summary>Checksum of preceding 255 words (16 bit units)</summary>
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public ushort checksum;
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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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} |