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401 lines
20 KiB
C#
401 lines
20 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : ODS.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Files-11 On-Disk Structure plugin.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies the Files-11 On-Disk Structure 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.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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using DiscImageChef.Console;
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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 VMS File System Internals by Kirby McCoy
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// ISBN: 1-55558-056-4
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// With some hints from http://www.decuslib.com/DECUS/vmslt97b/gnusoftware/gccaxp/7_1/vms/hm2def.h
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// Expects the home block to be always in sector #1 (does not check deltas)
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// Assumes a sector size of 512 bytes (VMS does on HDDs and optical drives, dunno about M.O.)
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// Book only describes ODS-2. Need to test ODS-1 and ODS-5
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// There is an ODS with signature "DECFILES11A", yet to be seen
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// Time is a 64 bit unsigned integer, tenths of microseconds since 1858/11/17 00:00:00.
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// TODO: Implement checksum
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public class ODS : Filesystem
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{
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public ODS()
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{
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Name = "Files-11 On-Disk Structure";
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PluginUuid = new Guid("de20633c-8021-4384-aeb0-83b0df14491f");
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CurrentEncoding = Encoding.GetEncoding("iso-8859-1");
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}
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public ODS(Encoding encoding)
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{
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Name = "Files-11 On-Disk Structure";
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PluginUuid = new Guid("de20633c-8021-4384-aeb0-83b0df14491f");
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CurrentEncoding = encoding ?? Encoding.GetEncoding("iso-8859-1");
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}
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public ODS(ImagePlugin imagePlugin, Partition partition, Encoding encoding)
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{
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Name = "Files-11 On-Disk Structure";
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PluginUuid = new Guid("de20633c-8021-4384-aeb0-83b0df14491f");
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CurrentEncoding = encoding ?? Encoding.GetEncoding("iso-8859-1");
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}
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public override bool Identify(ImagePlugin imagePlugin, Partition partition)
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{
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if(2 + partition.Start >= partition.End) return false;
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if(imagePlugin.GetSectorSize() < 512) return false;
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byte[] magicB = new byte[12];
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byte[] hbSector = imagePlugin.ReadSector(1 + partition.Start);
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Array.Copy(hbSector, 0x1F0, magicB, 0, 12);
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string magic = Encoding.ASCII.GetString(magicB);
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DicConsole.DebugWriteLine("Files-11 plugin", "magic: \"{0}\"", magic);
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if(magic == "DECFILE11A " || magic == "DECFILE11B ") return true;
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// Optical disc
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if(imagePlugin.ImageInfo.XmlMediaType != XmlMediaType.OpticalDisc) return false;
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if(hbSector.Length < 0x400) return false;
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hbSector = imagePlugin.ReadSector(partition.Start);
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Array.Copy(hbSector, 0x3F0, magicB, 0, 12);
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magic = Encoding.ASCII.GetString(magicB);
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DicConsole.DebugWriteLine("Files-11 plugin", "unaligned magic: \"{0}\"", magic);
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return magic == "DECFILE11A " || magic == "DECFILE11B ";
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}
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public override void GetInformation(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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byte[] hbSector = imagePlugin.ReadSector(1 + partition.Start);
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GCHandle handle = GCHandle.Alloc(hbSector, GCHandleType.Pinned);
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OdsHomeBlock homeblock =
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(OdsHomeBlock)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(OdsHomeBlock));
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handle.Free();
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// Optical disc
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if(imagePlugin.ImageInfo.XmlMediaType == XmlMediaType.OpticalDisc &&
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StringHandlers.CToString(homeblock.format) != "DECFILE11A " &&
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StringHandlers.CToString(homeblock.format) != "DECFILE11B ")
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{
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if(hbSector.Length < 0x400) return;
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byte[] tmp = imagePlugin.ReadSector(partition.Start);
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hbSector = new byte[0x200];
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Array.Copy(tmp, 0x200, hbSector, 0, 0x200);
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handle = GCHandle.Alloc(hbSector, GCHandleType.Pinned);
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homeblock = (OdsHomeBlock)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(OdsHomeBlock));
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handle.Free();
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if(StringHandlers.CToString(homeblock.format) != "DECFILE11A " &&
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StringHandlers.CToString(homeblock.format) != "DECFILE11B ") return;
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}
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if((homeblock.struclev & 0xFF00) != 0x0200 || (homeblock.struclev & 0xFF) != 1 ||
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StringHandlers.CToString(homeblock.format) != "DECFILE11B ")
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sb.AppendLine("The following information may be incorrect for this volume.");
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if(homeblock.resfiles < 5 || homeblock.devtype != 0) sb.AppendLine("This volume may be corrupted.");
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sb.AppendFormat("Volume format is {0}",
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StringHandlers.SpacePaddedToString(homeblock.format, CurrentEncoding)).AppendLine();
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sb.AppendFormat("Volume is Level {0} revision {1}", (homeblock.struclev & 0xFF00) >> 8,
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homeblock.struclev & 0xFF).AppendLine();
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sb.AppendFormat("Lowest structure in the volume is Level {0}, revision {1}",
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(homeblock.lowstruclev & 0xFF00) >> 8, homeblock.lowstruclev & 0xFF).AppendLine();
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sb.AppendFormat("Highest structure in the volume is Level {0}, revision {1}",
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(homeblock.highstruclev & 0xFF00) >> 8, homeblock.highstruclev & 0xFF).AppendLine();
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sb.AppendFormat("{0} sectors per cluster ({1} bytes)", homeblock.cluster, homeblock.cluster * 512)
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.AppendLine();
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sb.AppendFormat("This home block is on sector {0} (VBN {1})", homeblock.homelbn, homeblock.homevbn)
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.AppendLine();
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sb.AppendFormat("Secondary home block is on sector {0} (VBN {1})", homeblock.alhomelbn, homeblock.alhomevbn)
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.AppendLine();
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sb.AppendFormat("Volume bitmap starts in sector {0} (VBN {1})", homeblock.ibmaplbn, homeblock.ibmapvbn)
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.AppendLine();
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sb.AppendFormat("Volume bitmap runs for {0} sectors ({1} bytes)", homeblock.ibmapsize,
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homeblock.ibmapsize * 512).AppendLine();
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sb.AppendFormat("Backup INDEXF.SYS;1 is in sector {0} (VBN {1})", homeblock.altidxlbn, homeblock.altidxvbn)
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.AppendLine();
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sb.AppendFormat("{0} maximum files on the volume", homeblock.maxfiles).AppendLine();
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sb.AppendFormat("{0} reserved files", homeblock.resfiles).AppendLine();
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if(homeblock.rvn > 0 && homeblock.setcount > 0 &&
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StringHandlers.CToString(homeblock.strucname) != " ")
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sb.AppendFormat("Volume is {0} of {1} in set \"{2}\".", homeblock.rvn, homeblock.setcount,
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StringHandlers.SpacePaddedToString(homeblock.strucname, CurrentEncoding)).AppendLine();
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sb.AppendFormat("Volume owner is \"{0}\" (ID 0x{1:X8})",
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StringHandlers.SpacePaddedToString(homeblock.ownername, CurrentEncoding),
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homeblock.volowner).AppendLine();
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sb.AppendFormat("Volume label: \"{0}\"",
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StringHandlers.SpacePaddedToString(homeblock.volname, CurrentEncoding)).AppendLine();
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sb.AppendFormat("Drive serial number: 0x{0:X8}", homeblock.serialnum).AppendLine();
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sb.AppendFormat("Volume was created on {0}", DateHandlers.VmsToDateTime(homeblock.credate)).AppendLine();
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if(homeblock.revdate > 0)
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sb.AppendFormat("Volume was last modified on {0}", DateHandlers.VmsToDateTime(homeblock.revdate))
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.AppendLine();
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if(homeblock.copydate > 0)
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sb.AppendFormat("Volume copied on {0}", DateHandlers.VmsToDateTime(homeblock.copydate)).AppendLine();
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sb.AppendFormat("Checksums: 0x{0:X4} and 0x{1:X4}", homeblock.checksum1, homeblock.checksum2).AppendLine();
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sb.AppendLine("Flags:");
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sb.AppendFormat("Window: {0}", homeblock.window).AppendLine();
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sb.AppendFormat("Cached directores: {0}", homeblock.lru_lim).AppendLine();
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sb.AppendFormat("Default allocation: {0} blocks", homeblock.extend).AppendLine();
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if((homeblock.volchar & 0x01) == 0x01) sb.AppendLine("Readings should be verified");
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if((homeblock.volchar & 0x02) == 0x02) sb.AppendLine("Writings should be verified");
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if((homeblock.volchar & 0x04) == 0x04) sb.AppendLine("Files should be erased or overwritten when deleted");
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if((homeblock.volchar & 0x08) == 0x08) sb.AppendLine("Highwater mark is to be disabled");
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if((homeblock.volchar & 0x10) == 0x10) sb.AppendLine("Classification checks are enabled");
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sb.AppendLine("Volume permissions (r = read, w = write, c = create, d = delete)");
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sb.AppendLine("System, owner, group, world");
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// System
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sb.Append((homeblock.protect & 0x1000) == 0x1000 ? "-" : "r");
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sb.Append((homeblock.protect & 0x2000) == 0x2000 ? "-" : "w");
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sb.Append((homeblock.protect & 0x4000) == 0x4000 ? "-" : "c");
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sb.Append((homeblock.protect & 0x8000) == 0x8000 ? "-" : "d");
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// Owner
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sb.Append((homeblock.protect & 0x100) == 0x100 ? "-" : "r");
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sb.Append((homeblock.protect & 0x200) == 0x200 ? "-" : "w");
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sb.Append((homeblock.protect & 0x400) == 0x400 ? "-" : "c");
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sb.Append((homeblock.protect & 0x800) == 0x800 ? "-" : "d");
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// Group
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sb.Append((homeblock.protect & 0x10) == 0x10 ? "-" : "r");
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sb.Append((homeblock.protect & 0x20) == 0x20 ? "-" : "w");
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sb.Append((homeblock.protect & 0x40) == 0x40 ? "-" : "c");
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sb.Append((homeblock.protect & 0x80) == 0x80 ? "-" : "d");
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// World (other)
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sb.Append((homeblock.protect & 0x1) == 0x1 ? "-" : "r");
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sb.Append((homeblock.protect & 0x2) == 0x2 ? "-" : "w");
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sb.Append((homeblock.protect & 0x4) == 0x4 ? "-" : "c");
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sb.Append((homeblock.protect & 0x8) == 0x8 ? "-" : "d");
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sb.AppendLine();
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sb.AppendLine("Unknown structures:");
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sb.AppendFormat("Security mask: 0x{0:X8}", homeblock.sec_mask).AppendLine();
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sb.AppendFormat("File protection: 0x{0:X4}", homeblock.fileprot).AppendLine();
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sb.AppendFormat("Record protection: 0x{0:X4}", homeblock.recprot).AppendLine();
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XmlFsType = new FileSystemType
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{
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Type = "FILES-11",
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ClusterSize = homeblock.cluster * 512,
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Clusters = (long)partition.Size / (homeblock.cluster * 512),
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VolumeName = StringHandlers.SpacePaddedToString(homeblock.volname, CurrentEncoding),
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VolumeSerial = $"{homeblock.serialnum:X8}"
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};
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if(homeblock.credate > 0)
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{
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XmlFsType.CreationDate = DateHandlers.VmsToDateTime(homeblock.credate);
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XmlFsType.CreationDateSpecified = true;
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}
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if(homeblock.revdate > 0)
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{
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XmlFsType.ModificationDate = DateHandlers.VmsToDateTime(homeblock.revdate);
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XmlFsType.ModificationDateSpecified = true;
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}
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information = sb.ToString();
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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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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct OdsHomeBlock
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{
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/// <summary>0x000, LBN of THIS home block</summary>
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public uint homelbn;
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/// <summary>0x004, LBN of the secondary home block</summary>
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public uint alhomelbn;
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/// <summary>0x008, LBN of backup INDEXF.SYS;1</summary>
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public uint altidxlbn;
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/// <summary>0x00C, High byte contains filesystem version (1, 2 or 5), low byte contains revision (1)</summary>
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public ushort struclev;
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/// <summary>0x00E, Number of blocks each bit of the volume bitmap represents</summary>
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public ushort cluster;
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/// <summary>0x010, VBN of THIS home block</summary>
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public ushort homevbn;
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/// <summary>0x012, VBN of the secondary home block</summary>
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public ushort alhomevbn;
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/// <summary>0x014, VBN of backup INDEXF.SYS;1</summary>
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public ushort altidxvbn;
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/// <summary>0x016, VBN of the bitmap</summary>
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public ushort ibmapvbn;
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/// <summary>0x018, LBN of the bitmap</summary>
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public uint ibmaplbn;
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/// <summary>0x01C, Max files on volume</summary>
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public uint maxfiles;
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/// <summary>0x020, Bitmap size in sectors</summary>
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public ushort ibmapsize;
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/// <summary>0x022, Reserved files, 5 at minimum</summary>
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public ushort resfiles;
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/// <summary>0x024, Device type, ODS-2 defines it as always 0</summary>
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public ushort devtype;
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/// <summary>0x026, Relative volume number (number of the volume in a set)</summary>
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public ushort rvn;
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/// <summary>0x028, Total number of volumes in the set this volume is</summary>
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public ushort setcount;
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/// <summary>0x02A, Flags</summary>
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public ushort volchar;
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/// <summary>0x02C, User ID of the volume owner</summary>
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public uint volowner;
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/// <summary>0x030, Security mask (??)</summary>
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public uint sec_mask;
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/// <summary>0x034, Volume permissions (system, owner, group and other)</summary>
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public ushort protect;
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/// <summary>0x036, Default file protection, unsupported in ODS-2</summary>
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public ushort fileprot;
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/// <summary>0x038, Default file record protection</summary>
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public ushort recprot;
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/// <summary>0x03A, Checksum of all preceding entries</summary>
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public ushort checksum1;
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/// <summary>0x03C, Creation date</summary>
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public ulong credate;
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/// <summary>0x044, Window size (pointers for the window)</summary>
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public byte window;
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/// <summary>0x045, Directories to be stored in cache</summary>
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public byte lru_lim;
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/// <summary>0x046, Default allocation size in blocks</summary>
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public ushort extend;
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/// <summary>0x048, Minimum file retention period</summary>
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public ulong retainmin;
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/// <summary>0x050, Maximum file retention period</summary>
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public ulong retainmax;
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/// <summary>0x058, Last modification date</summary>
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public ulong revdate;
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/// <summary>0x060, Minimum security class, 20 bytes</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)] public byte[] min_class;
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/// <summary>0x074, Maximum security class, 20 bytes</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)] public byte[] max_class;
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/// <summary>0x088, File lookup table FID</summary>
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public ushort filetab_fid1;
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/// <summary>0x08A, File lookup table FID</summary>
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public ushort filetab_fid2;
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/// <summary>0x08C, File lookup table FID</summary>
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public ushort filetab_fid3;
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/// <summary>0x08E, Lowest structure level on the volume</summary>
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public ushort lowstruclev;
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/// <summary>0x090, Highest structure level on the volume</summary>
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public ushort highstruclev;
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/// <summary>0x092, Volume copy date (??)</summary>
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public ulong copydate;
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/// <summary>0x09A, 302 bytes</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 302)] public byte[] reserved1;
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/// <summary>0x1C8, Physical drive serial number</summary>
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public uint serialnum;
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/// <summary>0x1CC, Name of the volume set, 12 bytes</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)] public byte[] strucname;
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/// <summary>0x1D8, Volume label, 12 bytes</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)] public byte[] volname;
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/// <summary>0x1E4, Name of the volume owner, 12 bytes</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)] public byte[] ownername;
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/// <summary>0x1F0, ODS-2 defines it as "DECFILE11B", 12 bytes</summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)] public byte[] format;
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/// <summary>0x1FC, Reserved</summary>
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public ushort reserved2;
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/// <summary>0x1FE, Checksum of preceding 255 words (16 bit units)</summary>
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public ushort checksum2;
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}
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}
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} |