mirror of
https://github.com/aaru-dps/Aaru.git
synced 2025-12-16 11:14:25 +00:00
215 lines
8.7 KiB
C#
215 lines
8.7 KiB
C#
// /***************************************************************************
|
|
// Aaru Data Preservation Suite
|
|
// ----------------------------------------------------------------------------
|
|
//
|
|
// Filename : PC98.cs
|
|
// Author(s) : Natalia Portillo <claunia@claunia.com>
|
|
//
|
|
// Component : Partitioning scheme plugins.
|
|
//
|
|
// --[ Description ] ----------------------------------------------------------
|
|
//
|
|
// Manages NEC PC-9800 partitions.
|
|
//
|
|
// --[ License ] --------------------------------------------------------------
|
|
//
|
|
// This library is free software; you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as
|
|
// published by the Free Software Foundation; either version 2.1 of the
|
|
// License, or (at your option) any later version.
|
|
//
|
|
// This library is distributed in the hope that it will be useful, but
|
|
// WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
// Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public
|
|
// License along with this library; if not, see <http://www.gnu.org/licenses/>.
|
|
//
|
|
// ----------------------------------------------------------------------------
|
|
// Copyright © 2011-2025 Natalia Portillo
|
|
// ****************************************************************************/
|
|
|
|
using System;
|
|
using System.Collections.Generic;
|
|
using System.Runtime.InteropServices;
|
|
using System.Text;
|
|
using Aaru.CommonTypes.Enums;
|
|
using Aaru.CommonTypes.Interfaces;
|
|
using Aaru.Helpers;
|
|
using Aaru.Logging;
|
|
using Marshal = Aaru.Helpers.Marshal;
|
|
|
|
namespace Aaru.Partitions;
|
|
|
|
/// <inheritdoc />
|
|
/// <summary>Implements decoding of NEC PC-9800 partitions</summary>
|
|
public sealed class PC98 : IPartition
|
|
{
|
|
const string MODULE_NAME = "PC-98 partitions plugin";
|
|
|
|
static string DecodePC98Sid(byte sid)
|
|
{
|
|
return (sid & 0x7F) switch
|
|
{
|
|
0x01 => Localization.FAT12,
|
|
0x04 => Localization.PC_UX,
|
|
0x06 => Localization.N88_BASIC_86,
|
|
|
|
// Supposedly for FAT16 < 32 MiB, seen in bigger partitions
|
|
0x11 or 0x21 => Localization.FAT16,
|
|
0x28 or 0x41 or 0x48 => Localization.Windows_Volume_Set,
|
|
0x44 => Localization.FreeBSD,
|
|
0x61 => Localization.FAT32,
|
|
0x62 => Localization.Linux,
|
|
_ => Localization.Unknown_partition_type
|
|
};
|
|
}
|
|
|
|
#region Nested type: Partition
|
|
|
|
[StructLayout(LayoutKind.Sequential, Pack = 1)]
|
|
readonly struct Partition
|
|
{
|
|
/// <summary>Some ID, if 0x80 bit is set, it is bootable</summary>
|
|
public readonly byte dp_mid;
|
|
/// <summary>Some ID, if 0x80 bit is set, it is active</summary>
|
|
public readonly byte dp_sid;
|
|
public readonly byte dp_dum1;
|
|
public readonly byte dp_dum2;
|
|
public readonly byte dp_ipl_sct;
|
|
public readonly byte dp_ipl_head;
|
|
public readonly ushort dp_ipl_cyl;
|
|
public readonly byte dp_ssect;
|
|
public readonly byte dp_shd;
|
|
public readonly ushort dp_scyl;
|
|
public readonly byte dp_esect;
|
|
public readonly byte dp_ehd;
|
|
public readonly ushort dp_ecyl;
|
|
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
|
|
public readonly byte[] dp_name;
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region Nested type: Table
|
|
|
|
[StructLayout(LayoutKind.Sequential, Pack = 1)]
|
|
readonly struct Table
|
|
{
|
|
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
|
|
public readonly Partition[] entries;
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region IPartition Members
|
|
|
|
/// <inheritdoc />
|
|
public string Name => Localization.PC98_Name;
|
|
|
|
/// <inheritdoc />
|
|
public Guid Id => new("27333401-C7C2-447D-961C-22AD0641A09A");
|
|
|
|
/// <inheritdoc />
|
|
public string Author => Authors.NATALIA_PORTILLO;
|
|
|
|
/// <inheritdoc />
|
|
public bool GetInformation(IMediaImage imagePlugin, out List<CommonTypes.Partition> partitions, ulong sectorOffset)
|
|
{
|
|
partitions = [];
|
|
|
|
if(sectorOffset != 0) return false;
|
|
|
|
ErrorNumber errno = imagePlugin.ReadSector(0, false, out byte[] bootSector, out _);
|
|
|
|
if(errno != ErrorNumber.NoError || bootSector[^2] != 0x55 || bootSector[^1] != 0xAA) return false;
|
|
|
|
errno = imagePlugin.ReadSector(1, false, out byte[] sector, out _);
|
|
|
|
if(errno != ErrorNumber.NoError) return false;
|
|
|
|
// Prevent false positives with some FAT BPBs
|
|
if(Encoding.ASCII.GetString(bootSector, 0x36, 3) == Localization.FAT) return false;
|
|
|
|
Table table = Marshal.ByteArrayToStructureLittleEndian<Table>(sector);
|
|
|
|
ulong counter = 0;
|
|
|
|
foreach(Partition entry in table.entries)
|
|
{
|
|
AaruLogging.Debug(MODULE_NAME, "entry.dp_mid = {0}", entry.dp_mid);
|
|
AaruLogging.Debug(MODULE_NAME, "entry.dp_sid = {0}", entry.dp_sid);
|
|
AaruLogging.Debug(MODULE_NAME, "entry.dp_dum1 = {0}", entry.dp_dum1);
|
|
AaruLogging.Debug(MODULE_NAME, "entry.dp_dum2 = {0}", entry.dp_dum2);
|
|
AaruLogging.Debug(MODULE_NAME, "entry.dp_ipl_sct = {0}", entry.dp_ipl_sct);
|
|
AaruLogging.Debug(MODULE_NAME, "entry.dp_ipl_head = {0}", entry.dp_ipl_head);
|
|
AaruLogging.Debug(MODULE_NAME, "entry.dp_ipl_cyl = {0}", entry.dp_ipl_cyl);
|
|
AaruLogging.Debug(MODULE_NAME, "entry.dp_ssect = {0}", entry.dp_ssect);
|
|
AaruLogging.Debug(MODULE_NAME, "entry.dp_shd = {0}", entry.dp_shd);
|
|
AaruLogging.Debug(MODULE_NAME, "entry.dp_scyl = {0}", entry.dp_scyl);
|
|
AaruLogging.Debug(MODULE_NAME, "entry.dp_esect = {0}", entry.dp_esect);
|
|
AaruLogging.Debug(MODULE_NAME, "entry.dp_ehd = {0}", entry.dp_ehd);
|
|
AaruLogging.Debug(MODULE_NAME, "entry.dp_ecyl = {0}", entry.dp_ecyl);
|
|
|
|
AaruLogging.Debug(MODULE_NAME,
|
|
"entry.dp_name = \"{0}\"",
|
|
StringHandlers.CToString(entry.dp_name, Encoding.GetEncoding(932)));
|
|
|
|
if(entry.dp_scyl == entry.dp_ecyl ||
|
|
entry.dp_ecyl <= 0 ||
|
|
entry.dp_scyl > imagePlugin.Info.Cylinders ||
|
|
entry.dp_ecyl > imagePlugin.Info.Cylinders ||
|
|
entry.dp_shd > imagePlugin.Info.Heads ||
|
|
entry.dp_ehd > imagePlugin.Info.Heads ||
|
|
entry.dp_ssect > imagePlugin.Info.SectorsPerTrack ||
|
|
entry.dp_esect > imagePlugin.Info.SectorsPerTrack)
|
|
continue;
|
|
|
|
var part = new CommonTypes.Partition
|
|
{
|
|
Start =
|
|
CHS.ToLBA(entry.dp_scyl,
|
|
entry.dp_shd,
|
|
(uint)(entry.dp_ssect + 1),
|
|
imagePlugin.Info.Heads,
|
|
imagePlugin.Info.SectorsPerTrack),
|
|
Type = DecodePC98Sid(entry.dp_sid),
|
|
Name = StringHandlers.CToString(entry.dp_name, Encoding.GetEncoding(932)).Trim(),
|
|
Sequence = counter,
|
|
Scheme = Name
|
|
};
|
|
|
|
part.Offset = part.Start * imagePlugin.Info.SectorSize;
|
|
|
|
part.Length = CHS.ToLBA(entry.dp_ecyl,
|
|
entry.dp_ehd,
|
|
(uint)(entry.dp_esect + 1),
|
|
imagePlugin.Info.Heads,
|
|
imagePlugin.Info.SectorsPerTrack) -
|
|
part.Start;
|
|
|
|
part.Size = part.Length * imagePlugin.Info.SectorSize;
|
|
|
|
AaruLogging.Debug(MODULE_NAME, "part.Start = {0}", part.Start);
|
|
AaruLogging.Debug(MODULE_NAME, "part.Type = {0}", part.Type);
|
|
AaruLogging.Debug(MODULE_NAME, "part.Name = {0}", part.Name);
|
|
AaruLogging.Debug(MODULE_NAME, "part.Sequence = {0}", part.Sequence);
|
|
AaruLogging.Debug(MODULE_NAME, "part.Offset = {0}", part.Offset);
|
|
AaruLogging.Debug(MODULE_NAME, "part.Length = {0}", part.Length);
|
|
AaruLogging.Debug(MODULE_NAME, "part.Size = {0}", part.Size);
|
|
|
|
if((entry.dp_mid & 0x20) != 0x20 && (entry.dp_mid & 0x44) != 0x44 ||
|
|
part.Start >= imagePlugin.Info.Sectors ||
|
|
part.End > imagePlugin.Info.Sectors)
|
|
continue;
|
|
|
|
partitions.Add(part);
|
|
counter++;
|
|
}
|
|
|
|
return partitions.Count > 0;
|
|
}
|
|
|
|
#endregion
|
|
} |