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Aaru/Aaru.Filesystems/FAT/BPB.cs

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// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename : BPB.cs
// Author(s) : Natalia Portillo <claunia@claunia.com>
//
// Component : Microsoft FAT filesystem plugin.
//
// --[ Description ] ----------------------------------------------------------
//
// Identifies the Microsoft FAT Boot Parameter Block variant.
//
// --[ 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 © 2011-2022 Natalia Portillo
// ****************************************************************************/
namespace Aaru.Filesystems;
using System;
using System.IO;
using System.Text;
using Aaru.CommonTypes;
using Aaru.CommonTypes.Enums;
using Aaru.CommonTypes.Interfaces;
using Aaru.Console;
using Aaru.Helpers;
public sealed partial class FAT
{
static BpbKind DetectBpbKind(byte[] bpbSector, IMediaImage imagePlugin, Partition partition,
out BiosParameterBlockEbpb fakeBpb, out HumanParameterBlock humanBpb,
out AtariParameterBlock atariBpb, out byte minBootNearJump, out bool andosOemCorrect,
out bool bootable)
{
fakeBpb = new BiosParameterBlockEbpb();
minBootNearJump = 0;
andosOemCorrect = false;
bootable = false;
humanBpb = Marshal.ByteArrayToStructureBigEndian<HumanParameterBlock>(bpbSector);
atariBpb = Marshal.ByteArrayToStructureLittleEndian<AtariParameterBlock>(bpbSector);
ulong expectedClusters = humanBpb.bpc > 0 ? partition.Size / humanBpb.bpc : 0;
// Check clusters for Human68k are correct
bool humanClustersCorrect = humanBpb.clusters == 0 ? humanBpb.big_clusters == expectedClusters
: humanBpb.clusters == expectedClusters;
// Check OEM for Human68k is correct
bool humanOemCorrect = bpbSector[2] >= 0x20 && bpbSector[3] >= 0x20 && bpbSector[4] >= 0x20 &&
bpbSector[5] >= 0x20 && bpbSector[6] >= 0x20 && bpbSector[7] >= 0x20 &&
bpbSector[8] >= 0x20 && bpbSector[9] >= 0x20 && bpbSector[10] >= 0x20 &&
bpbSector[11] >= 0x20 && bpbSector[12] >= 0x20 && bpbSector[13] >= 0x20 &&
bpbSector[14] >= 0x20 && bpbSector[15] >= 0x20 && bpbSector[16] >= 0x20 &&
bpbSector[17] >= 0x20;
// Check correct branch for Human68k
bool humanBranchCorrect = bpbSector[0] == 0x60 && bpbSector[1] >= 0x1C && bpbSector[1] < 0xFE;
AaruConsole.DebugWriteLine("FAT plugin", "humanClustersCorrect = {0}", humanClustersCorrect);
AaruConsole.DebugWriteLine("FAT plugin", "humanOemCorrect = {0}", humanOemCorrect);
AaruConsole.DebugWriteLine("FAT plugin", "humanBranchCorrect = {0}", humanBranchCorrect);
// If all Human68k checks are correct, it is a Human68k FAT16
bool useHumanBpb = humanClustersCorrect && humanOemCorrect && humanBranchCorrect && expectedClusters > 0;
if(useHumanBpb)
{
AaruConsole.DebugWriteLine("FAT plugin", "Using Human68k BPB");
fakeBpb.jump = humanBpb.jump;
fakeBpb.oem_name = humanBpb.oem_name;
fakeBpb.bps = (ushort)imagePlugin.Info.SectorSize;
fakeBpb.spc = (byte)(humanBpb.bpc / fakeBpb.bps);
fakeBpb.fats_no = 2;
fakeBpb.root_ent = humanBpb.root_ent;
fakeBpb.media = humanBpb.media;
fakeBpb.spfat = (ushort)(humanBpb.cpfat * fakeBpb.spc);
fakeBpb.boot_code = humanBpb.boot_code;
fakeBpb.sectors = humanBpb.clusters;
fakeBpb.big_sectors = humanBpb.big_clusters;
fakeBpb.rsectors = 1;
return BpbKind.Human;
}
var msxBpb = new MsxParameterBlock();
var dos2Bpb = new BiosParameterBlock2();
var dos30Bpb = new BiosParameterBlock30();
var dos32Bpb = new BiosParameterBlock32();
var dos33Bpb = new BiosParameterBlock33();
var shortEbpb = new BiosParameterBlockShortEbpb();
var ebpb = new BiosParameterBlockEbpb();
var apricotBpb = new ApricotLabel();
var useAtariBpb = false;
var useMsxBpb = false;
var useDos2Bpb = false;
var useDos3Bpb = false;
var useDos32Bpb = false;
var useDos33Bpb = false;
var userShortExtendedBpb = false;
var useExtendedBpb = false;
var useShortFat32 = false;
var useLongFat32 = false;
var useApricotBpb = false;
var useDecRainbowBpb = false;
if(imagePlugin.Info.SectorSize >= 256)
{
msxBpb = Marshal.ByteArrayToStructureLittleEndian<MsxParameterBlock>(bpbSector);
dos2Bpb = Marshal.ByteArrayToStructureLittleEndian<BiosParameterBlock2>(bpbSector);
dos30Bpb = Marshal.ByteArrayToStructureLittleEndian<BiosParameterBlock30>(bpbSector);
dos32Bpb = Marshal.ByteArrayToStructureLittleEndian<BiosParameterBlock32>(bpbSector);
dos33Bpb = Marshal.ByteArrayToStructureLittleEndian<BiosParameterBlock33>(bpbSector);
shortEbpb = Marshal.ByteArrayToStructureLittleEndian<BiosParameterBlockShortEbpb>(bpbSector);
ebpb = Marshal.ByteArrayToStructureLittleEndian<BiosParameterBlockEbpb>(bpbSector);
Fat32ParameterBlockShort shortFat32Bpb =
Marshal.ByteArrayToStructureLittleEndian<Fat32ParameterBlockShort>(bpbSector);
Fat32ParameterBlock fat32Bpb = Marshal.ByteArrayToStructureLittleEndian<Fat32ParameterBlock>(bpbSector);
apricotBpb = Marshal.ByteArrayToStructureLittleEndian<ApricotLabel>(bpbSector);
int bitsInBpsMsx = CountBits.Count(msxBpb.bps);
int bitsInBpsDos33 = CountBits.Count(dos33Bpb.bps);
int bitsInBpsDos40 = CountBits.Count(ebpb.bps);
int bitsInBpsFat32Short = CountBits.Count(shortFat32Bpb.bps);
int bitsInBpsFat32 = CountBits.Count(fat32Bpb.bps);
int bitsInBpsApricot = CountBits.Count(apricotBpb.mainBPB.bps);
bool correctSpcMsx = msxBpb.spc is 1 or 2 or 4 or 8 or 16 or 32 or 64;
bool correctSpcDos33 = dos33Bpb.spc is 1 or 2 or 4 or 8 or 16 or 32 or 64;
bool correctSpcDos40 = ebpb.spc is 1 or 2 or 4 or 8 or 16 or 32 or 64;
bool correctSpcFat32Short = shortFat32Bpb.spc is 1 or 2 or 4 or 8 or 16 or 32 or 64;
bool correctSpcFat32 = fat32Bpb.spc is 1 or 2 or 4 or 8 or 16 or 32 or 64;
bool correctSpcApricot = apricotBpb.mainBPB.spc is 1 or 2 or 4 or 8 or 16 or 32 or 64;
// This is to support FAT partitions on hybrid ISO/USB images
if(imagePlugin.Info.XmlMediaType == XmlMediaType.OpticalDisc)
{
atariBpb.sectors /= 4;
msxBpb.sectors /= 4;
dos2Bpb.sectors /= 4;
dos30Bpb.sectors /= 4;
dos32Bpb.sectors /= 4;
dos33Bpb.sectors /= 4;
dos33Bpb.big_sectors /= 4;
shortEbpb.sectors /= 4;
shortEbpb.big_sectors /= 4;
ebpb.sectors /= 4;
ebpb.big_sectors /= 4;
shortFat32Bpb.sectors /= 4;
shortFat32Bpb.big_sectors /= 4;
shortFat32Bpb.huge_sectors /= 4;
fat32Bpb.sectors /= 4;
fat32Bpb.big_sectors /= 4;
apricotBpb.mainBPB.sectors /= 4;
}
andosOemCorrect = dos33Bpb.oem_name[0] < 0x20 && dos33Bpb.oem_name[1] >= 0x20 &&
dos33Bpb.oem_name[2] >= 0x20 && dos33Bpb.oem_name[3] >= 0x20 &&
dos33Bpb.oem_name[4] >= 0x20 && dos33Bpb.oem_name[5] >= 0x20 &&
dos33Bpb.oem_name[6] >= 0x20 && dos33Bpb.oem_name[7] >= 0x20;
if(bitsInBpsFat32 == 1 &&
correctSpcFat32 &&
fat32Bpb.fats_no <= 2 &&
fat32Bpb.spfat == 0 &&
fat32Bpb.signature == 0x29 &&
Encoding.ASCII.GetString(fat32Bpb.fs_type) == "FAT32 ")
{
AaruConsole.DebugWriteLine("FAT plugin", "Using FAT32 BPB");
minBootNearJump = 0x58;
return BpbKind.LongFat32;
}
if(bitsInBpsFat32Short == 1 &&
correctSpcFat32Short &&
shortFat32Bpb.fats_no <= 2 &&
shortFat32Bpb.sectors == 0 &&
shortFat32Bpb.spfat == 0 &&
shortFat32Bpb.signature == 0x28)
{
AaruConsole.DebugWriteLine("FAT plugin", "Using short FAT32 BPB");
minBootNearJump = 0x57;
return BpbKind.ShortFat32;
}
if(bitsInBpsMsx == 1 &&
correctSpcMsx &&
msxBpb.fats_no <= 2 &&
msxBpb.root_ent > 0 &&
msxBpb.sectors <= partition.End - partition.Start + 1 &&
msxBpb.spfat > 0 &&
Encoding.ASCII.GetString(msxBpb.vol_id) == "VOL_ID")
{
AaruConsole.DebugWriteLine("FAT plugin", "Using MSX BPB");
useMsxBpb = true;
}
else if(bitsInBpsApricot == 1 &&
correctSpcApricot &&
apricotBpb.mainBPB.fats_no <= 2 &&
apricotBpb.mainBPB.root_ent > 0 &&
apricotBpb.mainBPB.sectors <= partition.End - partition.Start + 1 &&
apricotBpb.mainBPB.spfat > 0 &&
apricotBpb.partitionCount == 0)
{
AaruConsole.DebugWriteLine("FAT plugin", "Using Apricot BPB");
useApricotBpb = true;
}
else if(bitsInBpsDos40 == 1 &&
correctSpcDos40 &&
ebpb.fats_no <= 2 &&
ebpb.root_ent > 0 &&
ebpb.spfat > 0 &&
(ebpb.signature is 0x28 or 0x29 || andosOemCorrect))
{
if(ebpb.sectors == 0)
{
if(ebpb.big_sectors <= partition.End - partition.Start + 1)
if(ebpb.signature == 0x29 || andosOemCorrect)
{
AaruConsole.DebugWriteLine("FAT plugin", "Using DOS 4.0 BPB");
useExtendedBpb = true;
minBootNearJump = 0x3C;
}
else
{
AaruConsole.DebugWriteLine("FAT plugin", "Using DOS 3.4 BPB");
userShortExtendedBpb = true;
minBootNearJump = 0x29;
}
}
else if(ebpb.sectors <= partition.End - partition.Start + 1)
if(ebpb.signature == 0x29 || andosOemCorrect)
{
AaruConsole.DebugWriteLine("FAT plugin", "Using DOS 4.0 BPB");
useExtendedBpb = true;
minBootNearJump = 0x3C;
}
else
{
AaruConsole.DebugWriteLine("FAT plugin", "Using DOS 3.4 BPB");
userShortExtendedBpb = true;
minBootNearJump = 0x29;
}
}
else if(bitsInBpsDos33 == 1 &&
correctSpcDos33 &&
dos33Bpb.rsectors < partition.End - partition.Start &&
dos33Bpb.fats_no <= 2 &&
dos33Bpb.root_ent > 0 &&
dos33Bpb.spfat > 0)
if(dos33Bpb.sectors == 0 &&
dos33Bpb.hsectors <= partition.Start &&
dos33Bpb.big_sectors > 0 &&
dos33Bpb.big_sectors <= partition.End - partition.Start + 1)
{
AaruConsole.DebugWriteLine("FAT plugin", "Using DOS 3.3 BPB");
useDos33Bpb = true;
minBootNearJump = 0x22;
}
else if(dos33Bpb.big_sectors == 0 &&
dos33Bpb.hsectors <= partition.Start &&
dos33Bpb.sectors > 0 &&
dos33Bpb.sectors <= partition.End - partition.Start + 1)
if(atariBpb.jump[0] == 0x60 ||
atariBpb.jump[0] == 0xE9 && atariBpb.jump[1] == 0x00 &&
Encoding.ASCII.GetString(dos33Bpb.oem_name) != "NEXT " ||
partition.Type is "GEM" or "BGM")
{
AaruConsole.DebugWriteLine("FAT plugin", "Using Atari BPB");
useAtariBpb = true;
}
else
{
AaruConsole.DebugWriteLine("FAT plugin", "Using DOS 3.3 BPB");
useDos33Bpb = true;
minBootNearJump = 0x22;
}
else
{
if(dos32Bpb.hsectors <= partition.Start &&
dos32Bpb.hsectors + dos32Bpb.sectors == dos32Bpb.total_sectors)
{
AaruConsole.DebugWriteLine("FAT plugin", "Using DOS 3.2 BPB");
useDos32Bpb = true;
minBootNearJump = 0x1E;
}
else if(dos30Bpb.sptrk is > 0 and < 64 &&
dos30Bpb.heads is > 0 and < 256)
if(atariBpb.jump[0] == 0x60 ||
atariBpb.jump[0] == 0xE9 && atariBpb.jump[1] == 0x00 &&
Encoding.ASCII.GetString(dos33Bpb.oem_name) != "NEXT ")
{
AaruConsole.DebugWriteLine("FAT plugin", "Using Atari BPB");
useAtariBpb = true;
}
else
{
AaruConsole.DebugWriteLine("FAT plugin", "Using DOS 3.0 BPB");
useDos3Bpb = true;
minBootNearJump = 0x1C;
}
else
{
if(atariBpb.jump[0] == 0x60 ||
atariBpb.jump[0] == 0xE9 && atariBpb.jump[1] == 0x00 &&
Encoding.ASCII.GetString(dos33Bpb.oem_name) != "NEXT ")
{
AaruConsole.DebugWriteLine("FAT plugin", "Using Atari BPB");
useAtariBpb = true;
}
else
{
AaruConsole.DebugWriteLine("FAT plugin", "Using DOS 2.0 BPB");
useDos2Bpb = true;
minBootNearJump = 0x16;
}
}
}
}
// DEC Rainbow, lacks a BPB but has a very concrete structure...
if(imagePlugin.Info.Sectors == 800 &&
imagePlugin.Info.SectorSize == 512 &&
!useAtariBpb &&
!useMsxBpb &&
!useDos2Bpb &&
!useDos3Bpb &&
!useDos32Bpb &&
!useDos33Bpb &&
!userShortExtendedBpb &&
!useExtendedBpb &&
!useShortFat32 &&
!useLongFat32 &&
!useApricotBpb)
{
// DEC Rainbow boots up with a Z80, first byte should be DI (disable interrupts)
byte z80Di = bpbSector[0];
// First FAT1 sector resides at LBA 0x14
imagePlugin.ReadSector(0x14, out byte[] fat1Sector0);
// First FAT2 sector resides at LBA 0x1A
imagePlugin.ReadSector(0x1A, out byte[] fat2Sector0);
bool equalFatIds = fat1Sector0[0] == fat2Sector0[0] && fat1Sector0[1] == fat2Sector0[1];
// Volume is software interleaved 2:1
var rootMs = new MemoryStream();
foreach(ulong rootSector in new ulong[]
{
0x17, 0x19, 0x1B, 0x1D, 0x1E, 0x20
})
{
imagePlugin.ReadSector(rootSector, out byte[] tmp);
rootMs.Write(tmp, 0, tmp.Length);
}
byte[] rootDir = rootMs.ToArray();
var validRootDir = true;
// Iterate all root directory
for(var e = 0; e < 96 * 32; e += 32)
{
for(var c = 0; c < 11; c++)
if(rootDir[c + e] < 0x20 && rootDir[c + e] != 0x00 && rootDir[c + e] != 0x05 ||
rootDir[c + e] == 0xFF ||
rootDir[c + e] == 0x2E)
{
validRootDir = false;
break;
}
if(!validRootDir)
break;
}
if(z80Di == 0xF3 &&
equalFatIds &&
(fat1Sector0[0] & 0xF0) == 0xF0 &&
fat1Sector0[1] == 0xFF &&
validRootDir)
{
AaruConsole.DebugWriteLine("FAT plugin", "Using DEC Rainbow hardcoded BPB.");
fakeBpb.bps = 512;
fakeBpb.spc = 1;
fakeBpb.rsectors = 20;
fakeBpb.fats_no = 2;
fakeBpb.root_ent = 96;
fakeBpb.sectors = 800;
fakeBpb.media = 0xFA;
fakeBpb.sptrk = 10;
fakeBpb.heads = 1;
fakeBpb.hsectors = 0;
fakeBpb.spfat = 3;
bootable = true;
fakeBpb.boot_code = bpbSector;
return BpbKind.DecRainbow;
}
}
if(!useAtariBpb &&
!useMsxBpb &&
!useDos2Bpb &&
!useDos3Bpb &&
!useDos32Bpb &&
!useDos33Bpb &&
!useHumanBpb &&
!userShortExtendedBpb &&
!useExtendedBpb &&
!useShortFat32 &&
!useLongFat32 &&
!useApricotBpb &&
!useDecRainbowBpb)
{
imagePlugin.ReadSector(1 + partition.Start, out byte[] fatSector);
switch(fatSector[0])
{
case 0xE5:
if(imagePlugin.Info.Sectors == 2002 &&
imagePlugin.Info.SectorSize == 128)
{
AaruConsole.DebugWriteLine("FAT plugin", "Using hardcoded BPB.");
fakeBpb.bps = 128;
fakeBpb.spc = 4;
fakeBpb.rsectors = 1;
fakeBpb.fats_no = 2;
fakeBpb.root_ent = 64;
fakeBpb.sectors = 2002;
fakeBpb.media = 0xE5;
fakeBpb.sptrk = 26;
fakeBpb.heads = 1;
fakeBpb.hsectors = 0;
fakeBpb.spfat = 1;
}
break;
case 0xFD:
switch(imagePlugin.Info.Sectors)
{
case 4004 when imagePlugin.Info.SectorSize == 128:
AaruConsole.DebugWriteLine("FAT plugin", "Using hardcoded BPB.");
fakeBpb.bps = 128;
fakeBpb.spc = 4;
fakeBpb.rsectors = 4;
fakeBpb.fats_no = 2;
fakeBpb.root_ent = 68;
fakeBpb.sectors = 4004;
fakeBpb.media = 0xFD;
fakeBpb.sptrk = 26;
fakeBpb.heads = 2;
fakeBpb.hsectors = 0;
fakeBpb.spfat = 6;
break;
case 2002 when imagePlugin.Info.SectorSize == 128:
AaruConsole.DebugWriteLine("FAT plugin", "Using hardcoded BPB.");
fakeBpb.bps = 128;
fakeBpb.spc = 4;
fakeBpb.rsectors = 4;
fakeBpb.fats_no = 2;
fakeBpb.root_ent = 68;
fakeBpb.sectors = 2002;
fakeBpb.media = 0xFD;
fakeBpb.sptrk = 26;
fakeBpb.heads = 1;
fakeBpb.hsectors = 0;
fakeBpb.spfat = 6;
break;
}
break;
case 0xFE:
switch(imagePlugin.Info.Sectors)
{
case 320 when imagePlugin.Info.SectorSize == 512:
AaruConsole.DebugWriteLine("FAT plugin", "Using hardcoded BPB for 5.25\" SSDD.");
fakeBpb.bps = 512;
fakeBpb.spc = 1;
fakeBpb.rsectors = 1;
fakeBpb.fats_no = 2;
fakeBpb.root_ent = 64;
fakeBpb.sectors = 320;
fakeBpb.media = 0xFE;
fakeBpb.sptrk = 8;
fakeBpb.heads = 1;
fakeBpb.hsectors = 0;
fakeBpb.spfat = 1;
break;
case 2002 when imagePlugin.Info.SectorSize == 128:
AaruConsole.DebugWriteLine("FAT plugin", "Using hardcoded BPB.");
fakeBpb.bps = 128;
fakeBpb.spc = 4;
fakeBpb.rsectors = 1;
fakeBpb.fats_no = 2;
fakeBpb.root_ent = 68;
fakeBpb.sectors = 2002;
fakeBpb.media = 0xFE;
fakeBpb.sptrk = 26;
fakeBpb.heads = 1;
fakeBpb.hsectors = 0;
fakeBpb.spfat = 6;
break;
case 1232 when imagePlugin.Info.SectorSize == 1024:
AaruConsole.DebugWriteLine("FAT plugin", "Using hardcoded BPB.");
fakeBpb.bps = 1024;
fakeBpb.spc = 1;
fakeBpb.rsectors = 1;
fakeBpb.fats_no = 2;
fakeBpb.root_ent = 192;
fakeBpb.sectors = 1232;
fakeBpb.media = 0xFE;
fakeBpb.sptrk = 8;
fakeBpb.heads = 2;
fakeBpb.hsectors = 0;
fakeBpb.spfat = 2;
break;
case 616 when imagePlugin.Info.SectorSize == 1024:
AaruConsole.DebugWriteLine("FAT plugin", "Using hardcoded BPB.");
fakeBpb.bps = 1024;
fakeBpb.spc = 1;
fakeBpb.rsectors = 1;
fakeBpb.fats_no = 2;
fakeBpb.root_ent = 6192;
fakeBpb.sectors = 616;
fakeBpb.media = 0xFE;
fakeBpb.sptrk = 8;
fakeBpb.heads = 2;
fakeBpb.hsectors = 0;
break;
case 720 when imagePlugin.Info.SectorSize == 128:
AaruConsole.DebugWriteLine("FAT plugin", "Using hardcoded BPB.");
fakeBpb.bps = 128;
fakeBpb.spc = 2;
fakeBpb.rsectors = 54;
fakeBpb.fats_no = 2;
fakeBpb.root_ent = 64;
fakeBpb.sectors = 720;
fakeBpb.media = 0xFE;
fakeBpb.sptrk = 18;
fakeBpb.heads = 1;
fakeBpb.hsectors = 0;
fakeBpb.spfat = 4;
break;
case 640 when imagePlugin.Info.SectorSize == 512:
AaruConsole.DebugWriteLine("FAT plugin", "Using hardcoded BPB for 5.25\" DSDD.");
fakeBpb.bps = 512;
fakeBpb.spc = 2;
fakeBpb.rsectors = 1;
fakeBpb.fats_no = 2;
fakeBpb.root_ent = 112;
fakeBpb.sectors = 640;
fakeBpb.media = 0xFF;
fakeBpb.sptrk = 8;
fakeBpb.heads = 2;
fakeBpb.hsectors = 0;
fakeBpb.spfat = 1;
break;
}
break;
case 0xFF:
if(imagePlugin.Info.Sectors == 640 &&
imagePlugin.Info.SectorSize == 512)
{
AaruConsole.DebugWriteLine("FAT plugin", "Using hardcoded BPB for 5.25\" DSDD.");
fakeBpb.bps = 512;
fakeBpb.spc = 2;
fakeBpb.rsectors = 1;
fakeBpb.fats_no = 2;
fakeBpb.root_ent = 112;
fakeBpb.sectors = 640;
fakeBpb.media = 0xFF;
fakeBpb.sptrk = 8;
fakeBpb.heads = 2;
fakeBpb.hsectors = 0;
fakeBpb.spfat = 1;
}
break;
}
// This assumes a bootable sector will jump somewhere or disable interrupts in x86 code
bootable |= bpbSector[0] == 0xFA || bpbSector[0] == 0xEB && bpbSector[1] <= 0x7F ||
bpbSector[0] == 0xE9 && BitConverter.ToUInt16(bpbSector, 1) <= 0x1FC;
fakeBpb.boot_code = bpbSector;
return BpbKind.Hardcoded;
}
if(useExtendedBpb)
{
fakeBpb = ebpb;
return BpbKind.Extended;
}
if(userShortExtendedBpb)
{
fakeBpb.jump = shortEbpb.jump;
fakeBpb.oem_name = shortEbpb.oem_name;
fakeBpb.bps = shortEbpb.bps;
fakeBpb.spc = shortEbpb.spc;
fakeBpb.rsectors = shortEbpb.rsectors;
fakeBpb.fats_no = shortEbpb.fats_no;
fakeBpb.root_ent = shortEbpb.root_ent;
fakeBpb.sectors = shortEbpb.sectors;
fakeBpb.media = shortEbpb.media;
fakeBpb.spfat = shortEbpb.spfat;
fakeBpb.sptrk = shortEbpb.sptrk;
fakeBpb.heads = shortEbpb.heads;
fakeBpb.hsectors = shortEbpb.hsectors;
fakeBpb.big_sectors = shortEbpb.big_sectors;
fakeBpb.drive_no = shortEbpb.drive_no;
fakeBpb.flags = shortEbpb.flags;
fakeBpb.signature = shortEbpb.signature;
fakeBpb.serial_no = shortEbpb.serial_no;
fakeBpb.boot_code = shortEbpb.boot_code;
fakeBpb.boot_signature = shortEbpb.boot_signature;
return BpbKind.ShortExtended;
}
if(useDos33Bpb)
{
fakeBpb.jump = dos33Bpb.jump;
fakeBpb.oem_name = dos33Bpb.oem_name;
fakeBpb.bps = dos33Bpb.bps;
fakeBpb.spc = dos33Bpb.spc;
fakeBpb.rsectors = dos33Bpb.rsectors;
fakeBpb.fats_no = dos33Bpb.fats_no;
fakeBpb.root_ent = dos33Bpb.root_ent;
fakeBpb.sectors = dos33Bpb.sectors;
fakeBpb.media = dos33Bpb.media;
fakeBpb.spfat = dos33Bpb.spfat;
fakeBpb.sptrk = dos33Bpb.sptrk;
fakeBpb.heads = dos33Bpb.heads;
fakeBpb.hsectors = dos33Bpb.hsectors;
fakeBpb.big_sectors = dos33Bpb.big_sectors;
fakeBpb.boot_code = dos33Bpb.boot_code;
fakeBpb.boot_signature = dos33Bpb.boot_signature;
return BpbKind.Dos33;
}
if(useDos32Bpb)
{
fakeBpb.jump = dos32Bpb.jump;
fakeBpb.oem_name = dos32Bpb.oem_name;
fakeBpb.bps = dos32Bpb.bps;
fakeBpb.spc = dos32Bpb.spc;
fakeBpb.rsectors = dos32Bpb.rsectors;
fakeBpb.fats_no = dos32Bpb.fats_no;
fakeBpb.root_ent = dos32Bpb.root_ent;
fakeBpb.sectors = dos32Bpb.sectors;
fakeBpb.media = dos32Bpb.media;
fakeBpb.spfat = dos32Bpb.spfat;
fakeBpb.sptrk = dos32Bpb.sptrk;
fakeBpb.heads = dos32Bpb.heads;
fakeBpb.hsectors = dos32Bpb.hsectors;
fakeBpb.boot_code = dos32Bpb.boot_code;
fakeBpb.boot_signature = dos32Bpb.boot_signature;
return BpbKind.Dos32;
}
if(useDos3Bpb)
{
fakeBpb.jump = dos30Bpb.jump;
fakeBpb.oem_name = dos30Bpb.oem_name;
fakeBpb.bps = dos30Bpb.bps;
fakeBpb.spc = dos30Bpb.spc;
fakeBpb.rsectors = dos30Bpb.rsectors;
fakeBpb.fats_no = dos30Bpb.fats_no;
fakeBpb.root_ent = dos30Bpb.root_ent;
fakeBpb.sectors = dos30Bpb.sectors;
fakeBpb.media = dos30Bpb.media;
fakeBpb.spfat = dos30Bpb.spfat;
fakeBpb.sptrk = dos30Bpb.sptrk;
fakeBpb.heads = dos30Bpb.heads;
fakeBpb.hsectors = dos30Bpb.hsectors;
fakeBpb.boot_code = dos30Bpb.boot_code;
fakeBpb.boot_signature = dos30Bpb.boot_signature;
return BpbKind.Dos3;
}
if(useDos2Bpb)
{
fakeBpb.jump = dos2Bpb.jump;
fakeBpb.oem_name = dos2Bpb.oem_name;
fakeBpb.bps = dos2Bpb.bps;
fakeBpb.spc = dos2Bpb.spc;
fakeBpb.rsectors = dos2Bpb.rsectors;
fakeBpb.fats_no = dos2Bpb.fats_no;
fakeBpb.root_ent = dos2Bpb.root_ent;
fakeBpb.sectors = dos2Bpb.sectors;
fakeBpb.media = dos2Bpb.media;
fakeBpb.spfat = dos2Bpb.spfat;
fakeBpb.boot_code = dos2Bpb.boot_code;
fakeBpb.boot_signature = dos2Bpb.boot_signature;
return BpbKind.Dos2;
}
if(useMsxBpb)
{
fakeBpb.jump = msxBpb.jump;
fakeBpb.oem_name = msxBpb.oem_name;
fakeBpb.bps = msxBpb.bps;
fakeBpb.spc = msxBpb.spc;
fakeBpb.rsectors = msxBpb.rsectors;
fakeBpb.fats_no = msxBpb.fats_no;
fakeBpb.root_ent = msxBpb.root_ent;
fakeBpb.sectors = msxBpb.sectors;
fakeBpb.media = msxBpb.media;
fakeBpb.spfat = msxBpb.spfat;
fakeBpb.sptrk = msxBpb.sptrk;
fakeBpb.heads = msxBpb.heads;
fakeBpb.hsectors = msxBpb.hsectors;
fakeBpb.boot_code = msxBpb.boot_code;
fakeBpb.boot_signature = msxBpb.boot_signature;
fakeBpb.serial_no = msxBpb.serial_no;
// TODO: Is there any way to check this?
bootable = true;
return BpbKind.Msx;
}
if(useAtariBpb)
{
fakeBpb.jump = atariBpb.jump;
fakeBpb.oem_name = atariBpb.oem_name;
fakeBpb.bps = atariBpb.bps;
fakeBpb.spc = atariBpb.spc;
fakeBpb.rsectors = atariBpb.rsectors;
fakeBpb.fats_no = atariBpb.fats_no;
fakeBpb.root_ent = atariBpb.root_ent;
fakeBpb.sectors = atariBpb.sectors;
fakeBpb.media = atariBpb.media;
fakeBpb.spfat = atariBpb.spfat;
fakeBpb.sptrk = atariBpb.sptrk;
fakeBpb.heads = atariBpb.heads;
fakeBpb.boot_code = atariBpb.boot_code;
return BpbKind.Atari;
}
if(useApricotBpb)
{
fakeBpb.bps = apricotBpb.mainBPB.bps;
fakeBpb.spc = apricotBpb.mainBPB.spc;
fakeBpb.rsectors = apricotBpb.mainBPB.rsectors;
fakeBpb.fats_no = apricotBpb.mainBPB.fats_no;
fakeBpb.root_ent = apricotBpb.mainBPB.root_ent;
fakeBpb.sectors = apricotBpb.mainBPB.sectors;
fakeBpb.media = apricotBpb.mainBPB.media;
fakeBpb.spfat = apricotBpb.mainBPB.spfat;
fakeBpb.sptrk = apricotBpb.spt;
bootable = apricotBpb.bootType > 0;
if(apricotBpb.bootLocation > 0 &&
apricotBpb.bootLocation + apricotBpb.bootSize < imagePlugin.Info.Sectors)
imagePlugin.ReadSectors(apricotBpb.bootLocation,
(uint)(apricotBpb.sectorSize * apricotBpb.bootSize) /
imagePlugin.Info.SectorSize, out fakeBpb.boot_code);
return BpbKind.Apricot;
}
return BpbKind.None;
}
}
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