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Aaru.Server/DiscImageChef.Filesystems/AmigaDOS.cs

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Added support for AmigaDOS filesystems.
2015-04-20 06:26:33 +01:00
/***************************************************************************
The Disc Image Chef
----------------------------------------------------------------------------
Filename : AmigaDOS.cs
Version : 1.0
Author(s) : Natalia Portillo
Component : Filesystem plugins
Revision : $Revision$
Last change by : $Author$
Date : $Date$
--[ Description ] ----------------------------------------------------------
Identifies PC-Engine CDs.
--[ License ] --------------------------------------------------------------
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
----------------------------------------------------------------------------
Copyright (C) 2011-2014 Claunia.com
****************************************************************************/
//$Id$
using System;
using System.Text;
using DiscImageChef;
using DiscImageChef.PartPlugins;
using System.Collections.Generic;
namespace DiscImageChef.Plugins
{
class AmigaDOSPlugin : Plugin
{
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public AmigaDOSPlugin()
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{
Name = "Amiga DOS filesystem";
PluginUUID = new Guid("3c882400-208c-427d-a086-9119852a1bc7");
}
/// <summary>
/// Boot block, first 2 sectors
/// </summary>
struct BootBlock
{
/// <summary>
/// Offset 0x00, "DOSx" disk type
/// </summary>
public UInt32 diskType;
/// <summary>
/// Offset 0x04, Checksum
/// </summary>
public UInt32 checksum;
/// <summary>
/// Offset 0x08, Pointer to root block, mostly invalid
/// </summary>
public UInt32 root_ptr;
/// <summary>
/// Offset 0x0C, Boot code, til completion
/// </summary>
public byte[] bootCode;
}
struct RootBlock
{
/// <summary>
/// Offset 0x00, block type, value = T_HEADER (2)
/// </summary>
public UInt32 type;
/// <summary>
/// Offset 0x04, unused
/// </summary>
public UInt32 headerKey;
/// <summary>
/// Offset 0x08, unused
/// </summary>
public UInt32 highSeq;
/// <summary>
/// Offset 0x0C, longs used by hash table
/// </summary>
public UInt32 hashTableSize;
/// <summary>
/// Offset 0x10, unused
/// </summary>
public UInt32 firstData;
/// <summary>
/// Offset 0x14, Rootblock checksum
/// </summary>
public UInt32 checksum;
/// <summary>
/// Offset 0x18, Hashtable, size = (block size / 4) - 56 or size = hashTableSize
/// </summary>
public UInt32[] hashTable;
/// <summary>
/// Offset 0x18+hashTableSize*4+0, bitmap flag, 0xFFFFFFFF if valid
/// </summary>
public UInt32 bitmapFlag;
/// <summary>
/// Offset 0x18+hashTableSize*4+4, bitmap pages, 25 entries
/// </summary>
public UInt32[] bitmapPages;
/// <summary>
/// Offset 0x18+hashTableSize*4+104, pointer to bitmap extension block
/// </summary>
public UInt32 bitmapExtensionBlock;
/// <summary>
/// Offset 0x18+hashTableSize*4+108, last root alteration days since 1978/01/01
/// </summary>
public UInt32 rDays;
/// <summary>
/// Offset 0x18+hashTableSize*4+112, last root alteration minutes past midnight
/// </summary>
public UInt32 rMins;
/// <summary>
/// Offset 0x18+hashTableSize*4+116, last root alteration ticks (1/50 secs)
/// </summary>
public UInt32 rTicks;
/// <summary>
/// Offset 0x18+hashTableSize*4+120, disk name, pascal string, 32 bytes
/// </summary>
public string diskName;
/// <summary>
/// Offset 0x18+hashTableSize*4+152, unused
/// </summary>
public UInt32 reserved1;
/// <summary>
/// Offset 0x18+hashTableSize*4+156, unused
/// </summary>
public UInt32 reserved2;
/// <summary>
/// Offset 0x18+hashTableSize*4+160, last disk alteration days since 1978/01/01
/// </summary>
public UInt32 vDays;
/// <summary>
/// Offset 0x18+hashTableSize*4+164, last disk alteration minutes past midnight
/// </summary>
public UInt32 vMins;
/// <summary>
/// Offset 0x18+hashTableSize*4+168, last disk alteration ticks (1/50 secs)
/// </summary>
public UInt32 vTicks;
/// <summary>
/// Offset 0x18+hashTableSize*4+172, filesystem creation days since 1978/01/01
/// </summary>
public UInt32 cDays;
/// <summary>
/// Offset 0x18+hashTableSize*4+176, filesystem creation minutes since 1978/01/01
/// </summary>
public UInt32 cMins;
/// <summary>
/// Offset 0x18+hashTableSize*4+180, filesystem creation ticks since 1978/01/01
/// </summary>
public UInt32 cTicks;
/// <summary>
/// Offset 0x18+hashTableSize*4+184, unused
/// </summary>
public UInt32 nextHash;
/// <summary>
/// Offset 0x18+hashTableSize*4+188, unused
/// </summary>
public UInt32 parentDir;
/// <summary>
/// Offset 0x18+hashTableSize*4+192, first directory cache block
/// </summary>
public UInt32 extension;
/// <summary>
/// Offset 0x18+hashTableSize*4+196, block secondary type = ST_ROOT (1)
/// </summary>
public UInt32 sec_type;
}
public override bool Identify(ImagePlugins.ImagePlugin imagePlugin, ulong partitionStart, ulong partitionEnd)
{
if (partitionStart >= imagePlugin.GetSectors())
return false;
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
byte[] sector = imagePlugin.ReadSector(0 + partitionStart);
UInt32 magic = BigEndianBitConverter.ToUInt32(sector, 0x00);
if ((magic & 0x6D754600) != 0x6D754600 &&
(magic & 0x444F5300) != 0x444F5300)
return false;
ulong root_ptr = BigEndianBitConverter.ToUInt32(sector, 0x08);
Move filesystems to a separate library.
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//if (MainClass.isDebug)
Added support for AmigaDOS filesystems.
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Console.WriteLine("DEBUG (AmigaDOS plugin): Bootblock points to {0} as Rootblock", root_ptr);
root_ptr = (partitionEnd - partitionStart) / 2 + partitionStart;
Move filesystems to a separate library.
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//if (MainClass.isDebug)
Added support for AmigaDOS filesystems.
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Console.WriteLine("DEBUG (AmigaDOS plugin): Nonetheless, going to block {0} for Rootblock", root_ptr);
if (root_ptr >= imagePlugin.GetSectors())
return false;
sector = imagePlugin.ReadSector(root_ptr);
UInt32 type = BigEndianBitConverter.ToUInt32(sector, 0x00);
UInt32 hashTableSize = BigEndianBitConverter.ToUInt32(sector, 0x0C);
if ((0x18 + hashTableSize * 4 + 196) > sector.Length)
return false;
UInt32 sec_type = BigEndianBitConverter.ToUInt32(sector, (int)(0x18 + hashTableSize * 4 + 196));
return type == 2 && sec_type == 1;
}
public override void GetInformation(ImagePlugins.ImagePlugin imagePlugin, ulong partitionStart, ulong partitionEnd, out string information)
{
StringBuilder sbInformation = new StringBuilder();
byte[] BootBlockSectors = imagePlugin.ReadSectors(0 + partitionStart, 2);
byte[] RootBlockSector = imagePlugin.ReadSector((partitionEnd - partitionStart) / 2 + partitionStart);
byte[] diskName = new byte[32];
BootBlock bootBlk = new BootBlock();
RootBlock rootBlk = new RootBlock();
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
bootBlk.diskType = BigEndianBitConverter.ToUInt32(BootBlockSectors, 0x00);
bootBlk.checksum = BigEndianBitConverter.ToUInt32(BootBlockSectors, 0x04);
bootBlk.root_ptr = BigEndianBitConverter.ToUInt32(BootBlockSectors, 0x08);
bootBlk.bootCode = new byte[BootBlockSectors.Length - 0x0C];
Array.Copy(BootBlockSectors, 0x0C, bootBlk.bootCode, 0, BootBlockSectors.Length - 0x0C);
Move filesystems to a separate library.
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//if (MainClass.isDebug)
Added support for AmigaDOS filesystems.
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{
Console.WriteLine("DEBUG (AmigaDOS plugin): Stored boot blocks checksum is 0x{0:X8}", bootBlk.checksum);
Console.WriteLine("DEBUG (AmigaDOS plugin): Probably incorrect calculated boot blocks checksum is 0x{0:X8}", AmigaChecksum(RootBlockSector));
Checksums.SHA1Context sha1Ctx = new Checksums.SHA1Context();
sha1Ctx.Init();
sha1Ctx.Update(bootBlk.bootCode);
Console.WriteLine("DEBUG (AmigaDOS plugin): Boot code SHA1 is {0}", sha1Ctx.End());
}
rootBlk.type = BigEndianBitConverter.ToUInt32(RootBlockSector, 0x00);
rootBlk.headerKey = BigEndianBitConverter.ToUInt32(RootBlockSector, 0x04);
rootBlk.highSeq = BigEndianBitConverter.ToUInt32(RootBlockSector, 0x08);
rootBlk.hashTableSize = BigEndianBitConverter.ToUInt32(RootBlockSector, 0x0C);
rootBlk.firstData = BigEndianBitConverter.ToUInt32(RootBlockSector, 0x10);
rootBlk.checksum = BigEndianBitConverter.ToUInt32(RootBlockSector, 0x14);
rootBlk.hashTable = new uint[rootBlk.hashTableSize];
for (int i = 0; i < rootBlk.hashTableSize; i++)
Style corrections.
2015-04-20 17:52:08 +01:00
rootBlk.hashTable[i] = BigEndianBitConverter.ToUInt32(RootBlockSector, 0x18 + i * 4);
Added support for AmigaDOS filesystems.
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rootBlk.bitmapFlag = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 0));
rootBlk.bitmapPages = new uint[25];
for (int i = 0; i < 25; i++)
rootBlk.bitmapPages[i] = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 4 + i * 4));
rootBlk.bitmapExtensionBlock = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 104));
rootBlk.rDays = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 108));
rootBlk.rMins = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 112));
rootBlk.rTicks = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 116));
Style corrections.
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Array.Copy(RootBlockSector, 0x18 + rootBlk.hashTableSize * 4 + 120, diskName, 0, 32);
Added support for AmigaDOS filesystems.
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rootBlk.diskName = StringHandlers.PascalToString(diskName);
rootBlk.reserved1 = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 152));
rootBlk.reserved2 = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 156));
rootBlk.vDays = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 160));
rootBlk.vMins = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 164));
rootBlk.vTicks = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 168));
rootBlk.cDays = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 172));
rootBlk.cMins = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 176));
rootBlk.cTicks = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 180));
rootBlk.nextHash = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 184));
rootBlk.parentDir = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 188));
rootBlk.extension = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 192));
rootBlk.sec_type = BigEndianBitConverter.ToUInt32(RootBlockSector, (int)(0x18 + rootBlk.hashTableSize * 4 + 196));
Move filesystems to a separate library.
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//if (MainClass.isDebug)
Added support for AmigaDOS filesystems.
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{
Console.WriteLine("DEBUG (AmigaDOS plugin): Stored root block checksum is 0x{0:X8}", rootBlk.checksum);
Console.WriteLine("DEBUG (AmigaDOS plugin): Probably incorrect calculated root block checksum is 0x{0:X8}", AmigaChecksum(RootBlockSector));
}
switch (bootBlk.diskType & 0xFF)
{
case 0:
sbInformation.Append("Amiga Original File System");
break;
case 1:
sbInformation.Append("Amiga Fast File System");
break;
case 2:
sbInformation.Append("Amiga Original File System with international characters");
break;
case 3:
sbInformation.Append("Amiga Fast File System with international characters");
break;
case 4:
sbInformation.Append("Amiga Original File System with directory cache");
break;
case 5:
sbInformation.Append("Amiga Fast File System with directory cache");
break;
case 6:
sbInformation.Append("Amiga Original File System with long filenames");
break;
case 7:
sbInformation.Append("Amiga Fast File System with long filenames");
break;
}
Style corrections.
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if ((bootBlk.diskType & 0x6D754600) == 0x6D754600)
Added support for AmigaDOS filesystems.
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sbInformation.Append(", with multi-user patches");
sbInformation.AppendLine();
Style corrections.
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if ((bootBlk.diskType & 0xFF) == 6 || (bootBlk.diskType & 0xFF) == 7)
Added support for AmigaDOS filesystems.
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sbInformation.AppendLine("AFFS v2, following information may be completely incorrect or garbage.");
sbInformation.AppendFormat("Volume name: {0}", rootBlk.diskName).AppendLine();
if (rootBlk.bitmapFlag == 0xFFFFFFFF)
sbInformation.AppendLine("Volume bitmap is valid");
if (rootBlk.bitmapExtensionBlock != 0x00000000 && rootBlk.bitmapExtensionBlock != 0xFFFFFFFF)
sbInformation.AppendFormat("Bitmap extension at block {0}", rootBlk.bitmapExtensionBlock).AppendLine();
Style corrections.
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if ((bootBlk.diskType & 0xFF) == 4 || (bootBlk.diskType & 0xFF) == 5)
Added support for AmigaDOS filesystems.
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sbInformation.AppendFormat("Directory cache starts at block {0}", rootBlk.extension).AppendLine();
sbInformation.AppendFormat("Volume created on {0}", DateHandlers.AmigaToDateTime(rootBlk.cDays, rootBlk.cMins, rootBlk.cTicks)).AppendLine();
sbInformation.AppendFormat("Volume last modified on {0}", DateHandlers.AmigaToDateTime(rootBlk.vDays, rootBlk.vMins, rootBlk.vTicks)).AppendLine();
sbInformation.AppendFormat("Volume root directory last modified on on {0}", DateHandlers.AmigaToDateTime(rootBlk.rDays, rootBlk.rMins, rootBlk.rTicks)).AppendLine();
information = sbInformation.ToString();
}
static UInt32 AmigaChecksum(byte[] data)
{
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
UInt32 sum = 0;
for (int i = 0; i < data.Length; i += 4)
sum += BigEndianBitConverter.ToUInt32(data, i);
return sum;
}
}
}
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