mirror of
https://github.com/aaru-dps/Aaru.git
synced 2025-12-16 19:24:25 +00:00
464 lines
21 KiB
C#
464 lines
21 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : Atari.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Partitioning scheme plugins.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Manages Atari ST GEMDOS partitions.
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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 © 2011-2019 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.Checksums;
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using DiscImageChef.CommonTypes;
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using DiscImageChef.CommonTypes.Interfaces;
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using DiscImageChef.Console;
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namespace DiscImageChef.Partitions
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{
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public class AtariPartitions : IPartition
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{
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const uint TypeGEMDOS = 0x0047454D;
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const uint TypeBigGEMDOS = 0x0042474D;
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const uint TypeExtended = 0x0058474D;
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const uint TypeLinux = 0x004C4E58;
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const uint TypeSwap = 0x00535750;
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const uint TypeRAW = 0x00524157;
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const uint TypeNetBSD = 0x004E4244;
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const uint TypeNetBSDSwap = 0x004E4253;
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const uint TypeSysV = 0x00554E58;
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const uint TypeMac = 0x004D4143;
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const uint TypeMinix = 0x004D4958;
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const uint TypeMinix2 = 0x004D4E58;
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public string Name => "Atari partitions";
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public Guid Id => new Guid("d1dd0f24-ec39-4c4d-9072-be31919a3b5e");
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public string Author => "Natalia Portillo";
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public bool GetInformation(IMediaImage imagePlugin, out List<Partition> partitions, ulong sectorOffset)
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{
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partitions = new List<Partition>();
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if(imagePlugin.Info.SectorSize < 512) return false;
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BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
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byte[] sector = imagePlugin.ReadSector(sectorOffset);
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AtariTable table = new AtariTable
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{
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boot = new byte[342],
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icdEntries = new AtariEntry[8],
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unused = new byte[12],
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entries = new AtariEntry[4]
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};
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Array.Copy(sector, 0, table.boot, 0, 342);
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for(int i = 0; i < 8; i++)
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{
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table.icdEntries[i].type = BigEndianBitConverter.ToUInt32(sector, 342 + i * 12 + 0);
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table.icdEntries[i].start = BigEndianBitConverter.ToUInt32(sector, 342 + i * 12 + 4);
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table.icdEntries[i].length = BigEndianBitConverter.ToUInt32(sector, 342 + i * 12 + 8);
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}
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Array.Copy(sector, 438, table.unused, 0, 12);
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table.size = BigEndianBitConverter.ToUInt32(sector, 450);
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for(int i = 0; i < 4; i++)
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{
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table.entries[i].type = BigEndianBitConverter.ToUInt32(sector, 454 + i * 12 + 0);
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table.entries[i].start = BigEndianBitConverter.ToUInt32(sector, 454 + i * 12 + 4);
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table.entries[i].length = BigEndianBitConverter.ToUInt32(sector, 454 + i * 12 + 8);
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}
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table.badStart = BigEndianBitConverter.ToUInt32(sector, 502);
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table.badLength = BigEndianBitConverter.ToUInt32(sector, 506);
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table.checksum = BigEndianBitConverter.ToUInt16(sector, 510);
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Sha1Context sha1Ctx = new Sha1Context();
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sha1Ctx.Update(table.boot);
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DicConsole.DebugWriteLine("Atari partition plugin", "Boot code SHA1: {0}", sha1Ctx.End());
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for(int i = 0; i < 8; i++)
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{
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DicConsole.DebugWriteLine("Atari partition plugin", "table.icdEntries[{0}].flag = 0x{1:X2}", i,
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(table.icdEntries[i].type & 0xFF000000) >> 24);
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DicConsole.DebugWriteLine("Atari partition plugin", "table.icdEntries[{0}].type = 0x{1:X6}", i,
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table.icdEntries[i].type & 0x00FFFFFF);
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DicConsole.DebugWriteLine("Atari partition plugin", "table.icdEntries[{0}].start = {1}", i,
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table.icdEntries[i].start);
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DicConsole.DebugWriteLine("Atari partition plugin", "table.icdEntries[{0}].length = {1}", i,
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table.icdEntries[i].length);
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}
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DicConsole.DebugWriteLine("Atari partition plugin", "table.size = {0}", table.size);
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for(int i = 0; i < 4; i++)
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{
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DicConsole.DebugWriteLine("Atari partition plugin", "table.entries[{0}].flag = 0x{1:X2}", i,
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(table.entries[i].type & 0xFF000000) >> 24);
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DicConsole.DebugWriteLine("Atari partition plugin", "table.entries[{0}].type = 0x{1:X6}", i,
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table.entries[i].type & 0x00FFFFFF);
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DicConsole.DebugWriteLine("Atari partition plugin", "table.entries[{0}].start = {1}", i,
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table.entries[i].start);
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DicConsole.DebugWriteLine("Atari partition plugin", "table.entries[{0}].length = {1}", i,
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table.entries[i].length);
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}
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DicConsole.DebugWriteLine("Atari partition plugin", "table.badStart = {0}", table.badStart);
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DicConsole.DebugWriteLine("Atari partition plugin", "table.badLength = {0}", table.badLength);
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DicConsole.DebugWriteLine("Atari partition plugin", "table.checksum = 0x{0:X4}", table.checksum);
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bool validTable = false;
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ulong partitionSequence = 0;
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for(int i = 0; i < 4; i++)
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{
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uint type = table.entries[i].type & 0x00FFFFFF;
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switch(type)
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{
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case TypeGEMDOS:
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case TypeBigGEMDOS:
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case TypeLinux:
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case TypeSwap:
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case TypeRAW:
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case TypeNetBSD:
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case TypeNetBSDSwap:
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case TypeSysV:
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case TypeMac:
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case TypeMinix:
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case TypeMinix2:
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validTable = true;
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if(table.entries[i].start <= imagePlugin.Info.Sectors)
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{
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if(table.entries[i].start + table.entries[i].length > imagePlugin.Info.Sectors)
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DicConsole.DebugWriteLine("Atari partition plugin",
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"WARNING: End of partition goes beyond device size");
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ulong sectorSize = imagePlugin.Info.SectorSize;
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if(sectorSize == 2448 || sectorSize == 2352) sectorSize = 2048;
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byte[] partType = new byte[3];
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partType[0] = (byte)((type & 0xFF0000) >> 16);
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partType[1] = (byte)((type & 0x00FF00) >> 8);
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partType[2] = (byte)(type & 0x0000FF);
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Partition part = new Partition
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{
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Size = table.entries[i].length * sectorSize,
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Length = table.entries[i].length,
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Sequence = partitionSequence,
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Name = "",
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Offset = table.entries[i].start * sectorSize,
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Start = table.entries[i].start,
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Type = Encoding.ASCII.GetString(partType),
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Scheme = Name
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};
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switch(type)
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{
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case TypeGEMDOS:
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part.Description = "Atari GEMDOS partition";
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break;
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case TypeBigGEMDOS:
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part.Description = "Atari GEMDOS partition bigger than 32 MiB";
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break;
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case TypeLinux:
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part.Description = "Linux partition";
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break;
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case TypeSwap:
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part.Description = "Swap partition";
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break;
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case TypeRAW:
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part.Description = "RAW partition";
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break;
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case TypeNetBSD:
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part.Description = "NetBSD partition";
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break;
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case TypeNetBSDSwap:
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part.Description = "NetBSD swap partition";
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break;
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case TypeSysV:
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part.Description = "Atari UNIX partition";
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break;
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case TypeMac:
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part.Description = "Macintosh partition";
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break;
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case TypeMinix:
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case TypeMinix2:
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part.Description = "MINIX partition";
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break;
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default:
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part.Description = "Unknown partition type";
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break;
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}
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partitions.Add(part);
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partitionSequence++;
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}
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break;
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case TypeExtended:
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byte[] extendedSector = imagePlugin.ReadSector(table.entries[i].start);
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AtariTable extendedTable = new AtariTable();
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extendedTable.entries = new AtariEntry[4];
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for(int j = 0; j < 4; j++)
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{
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extendedTable.entries[j].type =
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BigEndianBitConverter.ToUInt32(extendedSector, 454 + j * 12 + 0);
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extendedTable.entries[j].start =
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BigEndianBitConverter.ToUInt32(extendedSector, 454 + j * 12 + 4);
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extendedTable.entries[j].length =
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BigEndianBitConverter.ToUInt32(extendedSector, 454 + j * 12 + 8);
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}
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for(int j = 0; j < 4; j++)
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{
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uint extendedType = extendedTable.entries[j].type & 0x00FFFFFF;
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if(extendedType != TypeGEMDOS && extendedType != TypeBigGEMDOS &&
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extendedType != TypeLinux && extendedType != TypeSwap &&
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extendedType != TypeRAW &&
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extendedType != TypeNetBSD && extendedType != TypeNetBSDSwap &&
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extendedType != TypeSysV && extendedType != TypeMac &&
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extendedType != TypeMinix &&
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extendedType != TypeMinix2) continue;
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validTable = true;
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if(extendedTable.entries[j].start > imagePlugin.Info.Sectors) continue;
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if(extendedTable.entries[j].start + extendedTable.entries[j].length >
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imagePlugin.Info.Sectors)
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DicConsole.DebugWriteLine("Atari partition plugin",
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"WARNING: End of partition goes beyond device size");
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ulong sectorSize = imagePlugin.Info.SectorSize;
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if(sectorSize == 2448 || sectorSize == 2352) sectorSize = 2048;
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byte[] partType = new byte[3];
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partType[0] = (byte)((extendedType & 0xFF0000) >> 16);
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partType[1] = (byte)((extendedType & 0x00FF00) >> 8);
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partType[2] = (byte)(extendedType & 0x0000FF);
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Partition part = new Partition
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{
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Size = extendedTable.entries[j].length * sectorSize,
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Length = extendedTable.entries[j].length,
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Sequence = partitionSequence,
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Name = "",
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Offset = extendedTable.entries[j].start * sectorSize,
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Start = extendedTable.entries[j].start,
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Type = Encoding.ASCII.GetString(partType),
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Scheme = Name
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};
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switch(extendedType)
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{
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case TypeGEMDOS:
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part.Description = "Atari GEMDOS partition";
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break;
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case TypeBigGEMDOS:
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part.Description = "Atari GEMDOS partition bigger than 32 MiB";
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break;
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case TypeLinux:
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part.Description = "Linux partition";
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break;
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case TypeSwap:
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part.Description = "Swap partition";
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break;
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case TypeRAW:
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part.Description = "RAW partition";
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break;
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case TypeNetBSD:
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part.Description = "NetBSD partition";
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break;
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case TypeNetBSDSwap:
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part.Description = "NetBSD swap partition";
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break;
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case TypeSysV:
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part.Description = "Atari UNIX partition";
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break;
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case TypeMac:
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part.Description = "Macintosh partition";
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break;
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case TypeMinix:
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case TypeMinix2:
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part.Description = "MINIX partition";
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break;
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default:
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part.Description = "Unknown partition type";
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break;
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}
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partitions.Add(part);
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partitionSequence++;
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}
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break;
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}
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}
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if(!validTable) return partitions.Count > 0;
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for(int i = 0; i < 8; i++)
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{
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uint type = table.icdEntries[i].type & 0x00FFFFFF;
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if(type != TypeGEMDOS && type != TypeBigGEMDOS && type != TypeLinux && type != TypeSwap &&
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type != TypeRAW && type != TypeNetBSD && type != TypeNetBSDSwap && type != TypeSysV &&
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type != TypeMac && type != TypeMinix && type != TypeMinix2) continue;
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if(table.icdEntries[i].start > imagePlugin.Info.Sectors) continue;
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if(table.icdEntries[i].start + table.icdEntries[i].length > imagePlugin.Info.Sectors)
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DicConsole.DebugWriteLine("Atari partition plugin",
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"WARNING: End of partition goes beyond device size");
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ulong sectorSize = imagePlugin.Info.SectorSize;
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if(sectorSize == 2448 || sectorSize == 2352) sectorSize = 2048;
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byte[] partType = new byte[3];
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partType[0] = (byte)((type & 0xFF0000) >> 16);
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partType[1] = (byte)((type & 0x00FF00) >> 8);
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partType[2] = (byte)(type & 0x0000FF);
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Partition part = new Partition
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{
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Size = table.icdEntries[i].length * sectorSize,
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Length = table.icdEntries[i].length,
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Sequence = partitionSequence,
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Name = "",
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Offset = table.icdEntries[i].start * sectorSize,
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Start = table.icdEntries[i].start,
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Type = Encoding.ASCII.GetString(partType),
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Scheme = Name
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};
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switch(type)
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{
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case TypeGEMDOS:
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part.Description = "Atari GEMDOS partition";
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break;
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case TypeBigGEMDOS:
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part.Description = "Atari GEMDOS partition bigger than 32 MiB";
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break;
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case TypeLinux:
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part.Description = "Linux partition";
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break;
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case TypeSwap:
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part.Description = "Swap partition";
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break;
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case TypeRAW:
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part.Description = "RAW partition";
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break;
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case TypeNetBSD:
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part.Description = "NetBSD partition";
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break;
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case TypeNetBSDSwap:
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part.Description = "NetBSD swap partition";
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break;
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case TypeSysV:
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part.Description = "Atari UNIX partition";
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break;
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case TypeMac:
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part.Description = "Macintosh partition";
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break;
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case TypeMinix:
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case TypeMinix2:
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part.Description = "MINIX partition";
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break;
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default:
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part.Description = "Unknown partition type";
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break;
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}
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partitions.Add(part);
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partitionSequence++;
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}
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return partitions.Count > 0;
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}
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/// <summary>
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/// Atari partition entry
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/// </summary>
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struct AtariEntry
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{
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/// <summary>
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/// First byte flag, three bytes type in ASCII.
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/// Flag bit 0 = active
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/// Flag bit 7 = bootable
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/// </summary>
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public uint type;
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/// <summary>
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/// Starting sector
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/// </summary>
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public uint start;
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/// <summary>
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/// Length in sectors
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/// </summary>
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public uint length;
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}
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struct AtariTable
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{
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/// <summary>
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/// Boot code for 342 bytes
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/// </summary>
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public byte[] boot;
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/// <summary>
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/// 8 extra entries for ICDPro driver
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/// </summary>
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public AtariEntry[] icdEntries;
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/// <summary>
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/// Unused, 12 bytes
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/// </summary>
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public byte[] unused;
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/// <summary>
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/// Disk size in sectors
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/// </summary>
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public uint size;
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/// <summary>
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/// 4 partition entries
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/// </summary>
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public AtariEntry[] entries;
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/// <summary>
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/// Starting sector of bad block list
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/// </summary>
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public uint badStart;
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/// <summary>
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/// Length in sectors of bad block list
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/// </summary>
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public uint badLength;
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/// <summary>
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/// Checksum for bootable disks
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/// </summary>
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public ushort checksum;
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}
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}
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} |