mirror of
https://github.com/aaru-dps/Aaru.Server.git
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364 lines
16 KiB
C#
364 lines
16 KiB
C#
/***************************************************************************
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The Disc Image Chef
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----------------------------------------------------------------------------
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Filename : AmigaDOS.cs
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Version : 1.0
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Author(s) : Natalia Portillo
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Component : Filesystem plugins
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Revision : $Revision$
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Last change by : $Author$
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Date : $Date$
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--[ Description ] ----------------------------------------------------------
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Identifies PC-Engine CDs.
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--[ License ] --------------------------------------------------------------
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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----------------------------------------------------------------------------
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Copyright (C) 2011-2014 Claunia.com
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****************************************************************************/
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//$Id$
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using System;
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using System.Text;
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using DiscImageChef;
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using DiscImageChef.PartPlugins;
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using System.Collections.Generic;
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namespace DiscImageChef.Plugins
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{
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class AmigaDOSPlugin : Plugin
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{
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public AmigaDOSPlugin()
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{
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Name = "Amiga DOS filesystem";
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PluginUUID = new Guid("3c882400-208c-427d-a086-9119852a1bc7");
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}
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/// <summary>
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/// Boot block, first 2 sectors
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/// </summary>
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struct BootBlock
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{
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/// <summary>
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/// Offset 0x00, "DOSx" disk type
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/// </summary>
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public UInt32 diskType;
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/// <summary>
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/// Offset 0x04, Checksum
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/// </summary>
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public UInt32 checksum;
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/// <summary>
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/// Offset 0x08, Pointer to root block, mostly invalid
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/// </summary>
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public UInt32 root_ptr;
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/// <summary>
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/// Offset 0x0C, Boot code, til completion
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/// </summary>
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public byte[] bootCode;
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}
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struct RootBlock
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{
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/// <summary>
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/// Offset 0x00, block type, value = T_HEADER (2)
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/// </summary>
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public UInt32 type;
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/// <summary>
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/// Offset 0x04, unused
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/// </summary>
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public UInt32 headerKey;
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/// <summary>
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/// Offset 0x08, unused
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/// </summary>
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public UInt32 highSeq;
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/// <summary>
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/// Offset 0x0C, longs used by hash table
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/// </summary>
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public UInt32 hashTableSize;
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/// <summary>
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/// Offset 0x10, unused
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/// </summary>
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public UInt32 firstData;
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/// <summary>
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/// Offset 0x14, Rootblock checksum
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/// </summary>
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public UInt32 checksum;
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/// <summary>
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/// Offset 0x18, Hashtable, size = (block size / 4) - 56 or size = hashTableSize
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/// </summary>
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public UInt32[] hashTable;
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/// <summary>
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/// Offset 0x18+hashTableSize*4+0, bitmap flag, 0xFFFFFFFF if valid
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/// </summary>
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public UInt32 bitmapFlag;
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/// <summary>
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/// Offset 0x18+hashTableSize*4+4, bitmap pages, 25 entries
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/// </summary>
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public UInt32[] bitmapPages;
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/// <summary>
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/// Offset 0x18+hashTableSize*4+104, pointer to bitmap extension block
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/// </summary>
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public UInt32 bitmapExtensionBlock;
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/// <summary>
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/// Offset 0x18+hashTableSize*4+108, last root alteration days since 1978/01/01
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/// </summary>
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public UInt32 rDays;
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/// <summary>
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/// Offset 0x18+hashTableSize*4+112, last root alteration minutes past midnight
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/// </summary>
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public UInt32 rMins;
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/// <summary>
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/// Offset 0x18+hashTableSize*4+116, last root alteration ticks (1/50 secs)
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/// </summary>
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public UInt32 rTicks;
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/// <summary>
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/// Offset 0x18+hashTableSize*4+120, disk name, pascal string, 32 bytes
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/// </summary>
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public string diskName;
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/// <summary>
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/// Offset 0x18+hashTableSize*4+152, unused
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/// </summary>
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public UInt32 reserved1;
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/// <summary>
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/// Offset 0x18+hashTableSize*4+156, unused
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/// </summary>
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public UInt32 reserved2;
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/// <summary>
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/// Offset 0x18+hashTableSize*4+160, last disk alteration days since 1978/01/01
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/// </summary>
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public UInt32 vDays;
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/// <summary>
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/// Offset 0x18+hashTableSize*4+164, last disk alteration minutes past midnight
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/// </summary>
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public UInt32 vMins;
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/// <summary>
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/// Offset 0x18+hashTableSize*4+168, last disk alteration ticks (1/50 secs)
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/// </summary>
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public UInt32 vTicks;
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/// <summary>
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/// Offset 0x18+hashTableSize*4+172, filesystem creation days since 1978/01/01
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/// </summary>
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public UInt32 cDays;
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/// <summary>
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/// Offset 0x18+hashTableSize*4+176, filesystem creation minutes since 1978/01/01
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/// </summary>
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public UInt32 cMins;
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/// <summary>
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/// Offset 0x18+hashTableSize*4+180, filesystem creation ticks since 1978/01/01
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/// </summary>
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public UInt32 cTicks;
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/// <summary>
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/// Offset 0x18+hashTableSize*4+184, unused
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/// </summary>
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public UInt32 nextHash;
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/// <summary>
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/// Offset 0x18+hashTableSize*4+188, unused
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/// </summary>
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public UInt32 parentDir;
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/// <summary>
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/// Offset 0x18+hashTableSize*4+192, first directory cache block
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/// </summary>
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public UInt32 extension;
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/// <summary>
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/// Offset 0x18+hashTableSize*4+196, block secondary type = ST_ROOT (1)
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/// </summary>
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public UInt32 sec_type;
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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 (partitionStart >= imagePlugin.GetSectors())
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return false;
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BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
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byte[] sector = imagePlugin.ReadSector(0 + partitionStart);
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UInt32 magic = BigEndianBitConverter.ToUInt32(sector, 0x00);
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if ((magic & 0x6D754600) != 0x6D754600 &&
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(magic & 0x444F5300) != 0x444F5300)
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return false;
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ulong root_ptr = BigEndianBitConverter.ToUInt32(sector, 0x08);
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//if (MainClass.isDebug)
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Console.WriteLine("DEBUG (AmigaDOS plugin): Bootblock points to {0} as Rootblock", root_ptr);
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root_ptr = (partitionEnd - partitionStart) / 2 + partitionStart;
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//if (MainClass.isDebug)
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Console.WriteLine("DEBUG (AmigaDOS plugin): Nonetheless, going to block {0} for Rootblock", root_ptr);
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if (root_ptr >= imagePlugin.GetSectors())
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return false;
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sector = imagePlugin.ReadSector(root_ptr);
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UInt32 type = BigEndianBitConverter.ToUInt32(sector, 0x00);
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UInt32 hashTableSize = BigEndianBitConverter.ToUInt32(sector, 0x0C);
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if ((0x18 + hashTableSize * 4 + 196) > sector.Length)
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return false;
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UInt32 sec_type = BigEndianBitConverter.ToUInt32(sector, (int)(0x18 + hashTableSize * 4 + 196));
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return type == 2 && sec_type == 1;
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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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byte[] BootBlockSectors = imagePlugin.ReadSectors(0 + partitionStart, 2);
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byte[] RootBlockSector = imagePlugin.ReadSector((partitionEnd - partitionStart) / 2 + partitionStart);
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byte[] diskName = new byte[32];
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BootBlock bootBlk = new BootBlock();
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RootBlock rootBlk = new RootBlock();
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BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
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bootBlk.diskType = BigEndianBitConverter.ToUInt32(BootBlockSectors, 0x00);
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bootBlk.checksum = BigEndianBitConverter.ToUInt32(BootBlockSectors, 0x04);
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bootBlk.root_ptr = BigEndianBitConverter.ToUInt32(BootBlockSectors, 0x08);
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bootBlk.bootCode = new byte[BootBlockSectors.Length - 0x0C];
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Array.Copy(BootBlockSectors, 0x0C, bootBlk.bootCode, 0, BootBlockSectors.Length - 0x0C);
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//if (MainClass.isDebug)
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{
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Console.WriteLine("DEBUG (AmigaDOS plugin): Stored boot blocks checksum is 0x{0:X8}", bootBlk.checksum);
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Console.WriteLine("DEBUG (AmigaDOS plugin): Probably incorrect calculated boot blocks checksum is 0x{0:X8}", AmigaChecksum(RootBlockSector));
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Checksums.SHA1Context sha1Ctx = new Checksums.SHA1Context();
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sha1Ctx.Init();
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sha1Ctx.Update(bootBlk.bootCode);
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Console.WriteLine("DEBUG (AmigaDOS plugin): Boot code SHA1 is {0}", sha1Ctx.End());
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}
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rootBlk.type = BigEndianBitConverter.ToUInt32(RootBlockSector, 0x00);
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rootBlk.headerKey = BigEndianBitConverter.ToUInt32(RootBlockSector, 0x04);
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rootBlk.highSeq = BigEndianBitConverter.ToUInt32(RootBlockSector, 0x08);
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rootBlk.hashTableSize = BigEndianBitConverter.ToUInt32(RootBlockSector, 0x0C);
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rootBlk.firstData = BigEndianBitConverter.ToUInt32(RootBlockSector, 0x10);
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rootBlk.checksum = BigEndianBitConverter.ToUInt32(RootBlockSector, 0x14);
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rootBlk.hashTable = new uint[rootBlk.hashTableSize];
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for (int i = 0; i < rootBlk.hashTableSize; i++)
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rootBlk.hashTable[i] = BigEndianBitConverter.ToUInt32(RootBlockSector, 0x18 + i * 4);
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rootBlk.bitmapFlag = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 0));
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rootBlk.bitmapPages = new uint[25];
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for (int i = 0; i < 25; i++)
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rootBlk.bitmapPages[i] = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 4 + i * 4));
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rootBlk.bitmapExtensionBlock = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 104));
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rootBlk.rDays = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 108));
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rootBlk.rMins = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 112));
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rootBlk.rTicks = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 116));
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Array.Copy(RootBlockSector, 0x18 + rootBlk.hashTableSize * 4 + 120, diskName, 0, 32);
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rootBlk.diskName = StringHandlers.PascalToString(diskName);
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rootBlk.reserved1 = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 152));
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rootBlk.reserved2 = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 156));
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rootBlk.vDays = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 160));
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rootBlk.vMins = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 164));
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rootBlk.vTicks = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 168));
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rootBlk.cDays = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 172));
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rootBlk.cMins = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 176));
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rootBlk.cTicks = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 180));
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rootBlk.nextHash = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 184));
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rootBlk.parentDir = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 188));
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rootBlk.extension = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 192));
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rootBlk.sec_type = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 196));
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//if (MainClass.isDebug)
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{
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Console.WriteLine("DEBUG (AmigaDOS plugin): Stored root block checksum is 0x{0:X8}", rootBlk.checksum);
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Console.WriteLine("DEBUG (AmigaDOS plugin): Probably incorrect calculated root block checksum is 0x{0:X8}", AmigaChecksum(RootBlockSector));
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}
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switch (bootBlk.diskType & 0xFF)
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{
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case 0:
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sbInformation.Append("Amiga Original File System");
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break;
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case 1:
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sbInformation.Append("Amiga Fast File System");
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break;
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case 2:
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sbInformation.Append("Amiga Original File System with international characters");
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break;
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case 3:
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sbInformation.Append("Amiga Fast File System with international characters");
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break;
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case 4:
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sbInformation.Append("Amiga Original File System with directory cache");
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break;
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case 5:
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sbInformation.Append("Amiga Fast File System with directory cache");
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break;
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case 6:
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sbInformation.Append("Amiga Original File System with long filenames");
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break;
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case 7:
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sbInformation.Append("Amiga Fast File System with long filenames");
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break;
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}
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if ((bootBlk.diskType & 0x6D754600) == 0x6D754600)
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sbInformation.Append(", with multi-user patches");
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sbInformation.AppendLine();
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if ((bootBlk.diskType & 0xFF) == 6 || (bootBlk.diskType & 0xFF) == 7)
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sbInformation.AppendLine("AFFS v2, following information may be completely incorrect or garbage.");
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sbInformation.AppendFormat("Volume name: {0}", rootBlk.diskName).AppendLine();
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if (rootBlk.bitmapFlag == 0xFFFFFFFF)
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sbInformation.AppendLine("Volume bitmap is valid");
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if (rootBlk.bitmapExtensionBlock != 0x00000000 && rootBlk.bitmapExtensionBlock != 0xFFFFFFFF)
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sbInformation.AppendFormat("Bitmap extension at block {0}", rootBlk.bitmapExtensionBlock).AppendLine();
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if ((bootBlk.diskType & 0xFF) == 4 || (bootBlk.diskType & 0xFF) == 5)
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sbInformation.AppendFormat("Directory cache starts at block {0}", rootBlk.extension).AppendLine();
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sbInformation.AppendFormat("Volume created on {0}", DateHandlers.AmigaToDateTime(rootBlk.cDays, rootBlk.cMins, rootBlk.cTicks)).AppendLine();
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sbInformation.AppendFormat("Volume last modified on {0}", DateHandlers.AmigaToDateTime(rootBlk.vDays, rootBlk.vMins, rootBlk.vTicks)).AppendLine();
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sbInformation.AppendFormat("Volume root directory last modified on on {0}", DateHandlers.AmigaToDateTime(rootBlk.rDays, rootBlk.rMins, rootBlk.rTicks)).AppendLine();
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information = sbInformation.ToString();
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}
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static UInt32 AmigaChecksum(byte[] data)
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{
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BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
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UInt32 sum = 0;
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for (int i = 0; i < data.Length; i += 4)
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sum += BigEndianBitConverter.ToUInt32(data, i);
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return sum;
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}
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}
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} |