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299 lines
12 KiB
C#
299 lines
12 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : UCSDPascal.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : U.C.S.D. Pascal filesystem plugin.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies the U.C.S.D. Pascal 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 © 2011-2016 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.Text;
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using DiscImageChef.ImagePlugins;
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namespace DiscImageChef.Filesystems
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{
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// Information from Call-A.P.P.L.E. Pascal Disk Directory Structure
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public class PascalPlugin : Filesystem
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{
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public PascalPlugin()
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{
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Name = "U.C.S.D. Pascal filesystem";
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PluginUUID = new Guid("B0AC2CB5-72AA-473A-9200-270B5A2C2D53");
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}
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public PascalPlugin(ImagePlugins.ImagePlugin imagePlugin, ulong partitionStart, ulong partitionEnd)
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{
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Name = "U.C.S.D. Pascal filesystem";
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PluginUUID = new Guid("B0AC2CB5-72AA-473A-9200-270B5A2C2D53");
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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(imagePlugin.GetSectors() < 3)
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return false;
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// Blocks 0 and 1 are boot code
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byte[] volBlock = imagePlugin.ReadSector(2 + partitionStart);
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PascalVolumeEntry volEntry = new PascalVolumeEntry();
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BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
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volEntry.firstBlock = BigEndianBitConverter.ToInt16(volBlock, 0x00);
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volEntry.lastBlock = BigEndianBitConverter.ToInt16(volBlock, 0x02);
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volEntry.entryType = (PascalFileKind)BigEndianBitConverter.ToInt16(volBlock, 0x04);
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volEntry.volumeName = new byte[8];
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Array.Copy(volBlock, 0x06, volEntry.volumeName, 0, 8);
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volEntry.blocks = BigEndianBitConverter.ToInt16(volBlock, 0x0E);
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volEntry.files = BigEndianBitConverter.ToInt16(volBlock, 0x10);
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volEntry.dummy = BigEndianBitConverter.ToInt16(volBlock, 0x12);
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volEntry.lastBoot = BigEndianBitConverter.ToInt16(volBlock, 0x14);
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volEntry.tail = BigEndianBitConverter.ToInt32(volBlock, 0x16);
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// First block is always 0 (even is it's sector 2)
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if(volEntry.firstBlock != 0)
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return false;
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// Last volume record block must be after first block, and before end of device
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if(volEntry.lastBlock <= volEntry.firstBlock || (ulong)volEntry.lastBlock > imagePlugin.GetSectors() - 2)
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return false;
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// Volume record entry type must be volume or secure
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if(volEntry.entryType != PascalFileKind.Volume && volEntry.entryType != PascalFileKind.Secure)
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return false;
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// Volume name is max 7 characters
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if(volEntry.volumeName[0] > 7)
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return false;
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// Volume blocks is equal to volume sectors
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if(volEntry.blocks < 0 || (ulong)volEntry.blocks != imagePlugin.GetSectors())
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return false;
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// There can be not less than zero files
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if(volEntry.files < 0)
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return false;
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return true;
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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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StringBuilder sbInformation = new StringBuilder();
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information = "";
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if(imagePlugin.GetSectors() < 3)
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return;
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// Blocks 0 and 1 are boot code
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byte[] volBlock = imagePlugin.ReadSector(2 + partitionStart);
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PascalVolumeEntry volEntry = new PascalVolumeEntry();
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BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
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volEntry.firstBlock = BigEndianBitConverter.ToInt16(volBlock, 0x00);
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volEntry.lastBlock = BigEndianBitConverter.ToInt16(volBlock, 0x02);
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volEntry.entryType = (PascalFileKind)BigEndianBitConverter.ToInt16(volBlock, 0x04);
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volEntry.volumeName = new byte[8];
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Array.Copy(volBlock, 0x06, volEntry.volumeName, 0, 8);
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volEntry.blocks = BigEndianBitConverter.ToInt16(volBlock, 0x0E);
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volEntry.files = BigEndianBitConverter.ToInt16(volBlock, 0x10);
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volEntry.dummy = BigEndianBitConverter.ToInt16(volBlock, 0x12);
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volEntry.lastBoot = BigEndianBitConverter.ToInt16(volBlock, 0x14);
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volEntry.tail = BigEndianBitConverter.ToInt32(volBlock, 0x16);
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// First block is always 0 (even is it's sector 2)
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if(volEntry.firstBlock != 0)
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return;
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// Last volume record block must be after first block, and before end of device
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if(volEntry.lastBlock <= volEntry.firstBlock || (ulong)volEntry.lastBlock > imagePlugin.GetSectors() - 2)
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return;
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// Volume record entry type must be volume or secure
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if(volEntry.entryType != PascalFileKind.Volume && volEntry.entryType != PascalFileKind.Secure)
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return;
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// Volume name is max 7 characters
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if(volEntry.volumeName[0] > 7)
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return;
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// Volume blocks is equal to volume sectors
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if(volEntry.blocks < 0 || (ulong)volEntry.blocks != imagePlugin.GetSectors())
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return;
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// There can be not less than zero files
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if(volEntry.files < 0)
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return;
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sbInformation.AppendFormat("Volume record spans from block {0} to block {1}", volEntry.firstBlock, volEntry.lastBlock).AppendLine();
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sbInformation.AppendFormat("Volume name: {0}", StringHandlers.PascalToString(volEntry.volumeName)).AppendLine();
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sbInformation.AppendFormat("Volume has {0} blocks", volEntry.blocks).AppendLine();
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sbInformation.AppendFormat("Volume has {0} files", volEntry.files).AppendLine();
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sbInformation.AppendFormat("Volume last booted at {0}", DateHandlers.UCSDPascalToDateTime(volEntry.lastBoot)).AppendLine();
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information = sbInformation.ToString();
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byte[] bootBlocks = imagePlugin.ReadSectors(partitionStart, 2);
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xmlFSType = new Schemas.FileSystemType();
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xmlFSType.Bootable = !ArrayHelpers.ArrayIsNullOrEmpty(bootBlocks);
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xmlFSType.Clusters = volEntry.blocks;
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xmlFSType.ClusterSize = (int)imagePlugin.GetSectorSize();
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xmlFSType.Files = volEntry.files;
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xmlFSType.FilesSpecified = true;
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xmlFSType.Type = "UCSD Pascal";
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xmlFSType.VolumeName = StringHandlers.PascalToString(volEntry.volumeName);
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return;
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}
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enum PascalFileKind : short
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{
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/// <summary>Disk volume entry</summary>
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Volume = 0,
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/// <summary>File containing bad blocks</summary>
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Bad,
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/// <summary>Code file, machine executable</summary>
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Code,
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/// <summary>Text file, human readable</summary>
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Text,
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/// <summary>Information file for debugger</summary>
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Info,
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/// <summary>Data file</summary>
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Data,
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/// <summary>Graphics vectors</summary>
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Graf,
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/// <summary>Graphics screen image</summary>
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Foto,
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/// <summary>Security, not used</summary>
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Secure
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}
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struct PascalVolumeEntry
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{
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/// <summary>0x00, first block of volume entry</summary>
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public short firstBlock;
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/// <summary>0x02, last block of volume entry</summary>
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public short lastBlock;
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/// <summary>0x04, entry type</summary>
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public PascalFileKind entryType;
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/// <summary>0x06, volume name</summary>
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public byte[] volumeName;
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/// <summary>0x0E, block in volume</summary>
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public short blocks;
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/// <summary>0x10, files in volume</summary>
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public short files;
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/// <summary>0x12, dummy</summary>
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public short dummy;
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/// <summary>0x14, last booted</summary>
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public short lastBoot;
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/// <summary>0x16, tail to make record same size as <see cref="PascalFileEntry"/></summary>
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public int tail;
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}
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struct PascalFileEntry
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{
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/// <summary>0x00, first block of file</summary>
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public short firstBlock;
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/// <summary>0x02, last block of file</summary>
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public short lastBlock;
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/// <summary>0x04, entry type</summary>
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public PascalFileKind entryType;
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/// <summary>0x06, file name</summary>
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public byte[] filename;
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/// <summary>0x16, bytes used in last block</summary>
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public short lastBytes;
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/// <summary>0x18, modification time</summary>
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public short mtime;
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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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