static bool GetMinix(IMediaImage imagePlugin, ulong start, ulong divider, ulong sectorOffset, uint sectorSize,
out List <Partition> partitions)
{
partitions = new List <Partition>();
byte[] sector = imagePlugin.ReadSector(start);
GCHandle handle = GCHandle.Alloc(sector, GCHandleType.Pinned);
ExtendedBootRecord mnx =
(ExtendedBootRecord)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(ExtendedBootRecord));
handle.Free();
DicConsole.DebugWriteLine("MBR plugin", "mnx.magic == MBR_Magic = {0}", mnx.magic == MBR_MAGIC);
if (mnx.magic != MBR_MAGIC)
{
return(false);
}
bool anyMnx = false;
foreach (MbrPartitionEntry mnxEntry in mnx.entries)
{
bool mnxValid = true;
byte startSector = (byte)(mnxEntry.start_sector & 0x3F);
ushort startCylinder = (ushort)(((mnxEntry.start_sector & 0xC0) << 2) | mnxEntry.start_cylinder);
byte endSector = (byte)(mnxEntry.end_sector & 0x3F);
ushort endCylinder = (ushort)(((mnxEntry.end_sector & 0xC0) << 2) | mnxEntry.end_cylinder);
ulong mnxStart = mnxEntry.lba_start;
ulong mnxSectors = mnxEntry.lba_sectors;
DicConsole.DebugWriteLine("MBR plugin", "mnx_entry.status {0}", mnxEntry.status);
DicConsole.DebugWriteLine("MBR plugin", "mnx_entry.type {0}", mnxEntry.type);
DicConsole.DebugWriteLine("MBR plugin", "mnx_entry.lba_start {0}", mnxEntry.lba_start);
DicConsole.DebugWriteLine("MBR plugin", "mnx_entry.lba_sectors {0}", mnxEntry.lba_sectors);
DicConsole.DebugWriteLine("MBR plugin", "mnx_entry.start_cylinder {0}", startCylinder);
DicConsole.DebugWriteLine("MBR plugin", "mnx_entry.start_head {0}", mnxEntry.start_head);
DicConsole.DebugWriteLine("MBR plugin", "mnx_entry.start_sector {0}", startSector);
DicConsole.DebugWriteLine("MBR plugin", "mnx_entry.end_cylinder {0}", endCylinder);
DicConsole.DebugWriteLine("MBR plugin", "mnx_entry.end_head {0}", mnxEntry.end_head);
DicConsole.DebugWriteLine("MBR plugin", "mnx_entry.end_sector {0}", endSector);
mnxValid &= mnxEntry.status == 0x00 || mnxEntry.status == 0x80;
mnxValid &= mnxEntry.type == 0x81 || mnxEntry.type == 0x80;
mnxValid &= mnxEntry.lba_start != 0 || mnxEntry.lba_sectors != 0 || mnxEntry.start_cylinder != 0 ||
mnxEntry.start_head != 0 || mnxEntry.start_sector != 0 || mnxEntry.end_cylinder != 0 ||
mnxEntry.end_head != 0 || mnxEntry.end_sector != 0;
if (mnxEntry.lba_start == 0 && mnxEntry.lba_sectors == 0 && mnxValid)
{
mnxStart = CHS.ToLBA(startCylinder, mnxEntry.start_head, startSector, imagePlugin.Info.Heads,
imagePlugin.Info.SectorsPerTrack);
mnxSectors = CHS.ToLBA(endCylinder, mnxEntry.end_head, mnxEntry.end_sector,
imagePlugin.Info.Heads, imagePlugin.Info.SectorsPerTrack) -
mnxStart;
}
// For optical media
mnxStart /= divider;
mnxSectors /= divider;
DicConsole.DebugWriteLine("MBR plugin", "mnx_start {0}", mnxStart);
DicConsole.DebugWriteLine("MBR plugin", "mnx_sectors {0}", mnxSectors);
if (!mnxValid)
{
continue;
}
Partition part = new Partition();
if (mnxStart > 0 && mnxSectors > 0)
{
part.Start = mnxStart + sectorOffset;
part.Length = mnxSectors;
part.Offset = part.Start * sectorSize;
part.Size = part.Length * sectorSize;
}
else
{
mnxValid = false;
}
if (!mnxValid)
{
continue;
}
anyMnx = true;
part.Type = "MINIX";
part.Name = "MINIX";
part.Description = mnxEntry.status == 0x80 ? "Partition is bootable." : "";
part.Scheme = "MINIX";
partitions.Add(part);
}
return(anyMnx);
}
public bool GetInformation(IMediaImage imagePlugin, out List <Partition> partitions, ulong sectorOffset)
{
ulong counter = 0;
partitions = new List <Partition>();
if (imagePlugin.Info.SectorSize < 512)
{
return(false);
}
uint sectorSize = imagePlugin.Info.SectorSize;
// Divider of sector size in MBR between real sector size
ulong divider = 1;
if (imagePlugin.Info.XmlMediaType == XmlMediaType.OpticalDisc)
{
sectorSize = 512;
divider = 4;
}
byte[] sector = imagePlugin.ReadSector(sectorOffset);
GCHandle handle = GCHandle.Alloc(sector, GCHandleType.Pinned);
MasterBootRecord mbr =
(MasterBootRecord)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(MasterBootRecord));
TimedMasterBootRecord mbrTime =
(TimedMasterBootRecord)Marshal.PtrToStructure(handle.AddrOfPinnedObject(),
typeof(TimedMasterBootRecord));
SerializedMasterBootRecord mbrSerial =
(SerializedMasterBootRecord)Marshal.PtrToStructure(handle.AddrOfPinnedObject(),
typeof(SerializedMasterBootRecord));
ModernMasterBootRecord mbrModern =
(ModernMasterBootRecord)Marshal.PtrToStructure(handle.AddrOfPinnedObject(),
typeof(ModernMasterBootRecord));
NecMasterBootRecord mbrNec =
(NecMasterBootRecord)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(NecMasterBootRecord));
DiskManagerMasterBootRecord mbrOntrack =
(DiskManagerMasterBootRecord)Marshal.PtrToStructure(handle.AddrOfPinnedObject(),
typeof(DiskManagerMasterBootRecord));
handle.Free();
DicConsole.DebugWriteLine("MBR plugin", "xmlmedia = {0}", imagePlugin.Info.XmlMediaType);
DicConsole.DebugWriteLine("MBR plugin", "mbr.magic = {0:X4}", mbr.magic);
if (mbr.magic != MBR_MAGIC)
{
return(false); // Not MBR
}
byte[] hdrBytes = imagePlugin.ReadSector(1 + sectorOffset);
ulong signature = BitConverter.ToUInt64(hdrBytes, 0);
DicConsole.DebugWriteLine("MBR Plugin", "gpt.signature = 0x{0:X16}", signature);
if (signature == GPT_MAGIC)
{
return(false);
}
if (signature != GPT_MAGIC && imagePlugin.Info.XmlMediaType == XmlMediaType.OpticalDisc)
{
hdrBytes = imagePlugin.ReadSector(sectorOffset);
signature = BitConverter.ToUInt64(hdrBytes, 512);
DicConsole.DebugWriteLine("MBR Plugin", "gpt.signature @ 0x200 = 0x{0:X16}", signature);
if (signature == GPT_MAGIC)
{
return(false);
}
}
MbrPartitionEntry[] entries;
if (mbrOntrack.dm_magic == DM_MAGIC)
{
entries = mbrOntrack.entries;
}
else if (mbrNec.nec_magic == NEC_MAGIC)
{
entries = mbrNec.entries;
}
else
{
entries = mbr.entries;
}
foreach (MbrPartitionEntry entry in entries)
{
byte startSector = (byte)(entry.start_sector & 0x3F);
ushort startCylinder = (ushort)(((entry.start_sector & 0xC0) << 2) | entry.start_cylinder);
byte endSector = (byte)(entry.end_sector & 0x3F);
ushort endCylinder = (ushort)(((entry.end_sector & 0xC0) << 2) | entry.end_cylinder);
ulong lbaStart = entry.lba_start;
ulong lbaSectors = entry.lba_sectors;
// Let's start the fun...
bool valid = true;
bool extended = false;
bool minix = false;
if (entry.status != 0x00 && entry.status != 0x80)
{
return(false); // Maybe a FAT filesystem
}
valid &= entry.type != 0x00;
if (entry.type == 0x05 || entry.type == 0x0F || entry.type == 0x15 || entry.type == 0x1F ||
entry.type == 0x85 || entry.type == 0x91 || entry.type == 0x9B || entry.type == 0xC5 ||
entry.type == 0xCF || entry.type == 0xD5)
{
valid = false;
extended = true; // Extended partition
}
minix |= entry.type == 0x81 || entry.type == 0x80; // MINIX partition
valid &= entry.lba_start != 0 || entry.lba_sectors != 0 || entry.start_cylinder != 0 ||
entry.start_head != 0 || entry.start_sector != 0 || entry.end_cylinder != 0 ||
entry.end_head != 0 || entry.end_sector != 0;
if (entry.lba_start == 0 && entry.lba_sectors == 0 && valid)
{
lbaStart = CHS.ToLBA(startCylinder, entry.start_head, startSector, imagePlugin.Info.Heads,
imagePlugin.Info.SectorsPerTrack);
lbaSectors = CHS.ToLBA(endCylinder, entry.end_head, entry.end_sector, imagePlugin.Info.Heads,
imagePlugin.Info.SectorsPerTrack) - lbaStart;
}
// For optical media
lbaStart /= divider;
lbaSectors /= divider;
if (minix && lbaStart == sectorOffset)
{
minix = false;
}
if (lbaStart > imagePlugin.Info.Sectors)
{
valid = false;
extended = false;
}
// Some buggy implementations do some rounding errors getting a few sectors beyond device size
if (lbaStart + lbaSectors > imagePlugin.Info.Sectors)
{
lbaSectors = imagePlugin.Info.Sectors - lbaStart;
}
DicConsole.DebugWriteLine("MBR plugin", "entry.status {0}", entry.status);
DicConsole.DebugWriteLine("MBR plugin", "entry.type {0}", entry.type);
DicConsole.DebugWriteLine("MBR plugin", "entry.lba_start {0}", entry.lba_start);
DicConsole.DebugWriteLine("MBR plugin", "entry.lba_sectors {0}", entry.lba_sectors);
DicConsole.DebugWriteLine("MBR plugin", "entry.start_cylinder {0}", startCylinder);
DicConsole.DebugWriteLine("MBR plugin", "entry.start_head {0}", entry.start_head);
DicConsole.DebugWriteLine("MBR plugin", "entry.start_sector {0}", startSector);
DicConsole.DebugWriteLine("MBR plugin", "entry.end_cylinder {0}", endCylinder);
DicConsole.DebugWriteLine("MBR plugin", "entry.end_head {0}", entry.end_head);
DicConsole.DebugWriteLine("MBR plugin", "entry.end_sector {0}", endSector);
DicConsole.DebugWriteLine("MBR plugin", "entry.minix = {0}", minix);
DicConsole.DebugWriteLine("MBR plugin", "lba_start {0}", lbaStart);
DicConsole.DebugWriteLine("MBR plugin", "lba_sectors {0}", lbaSectors);
if (valid && minix) // Let's mix the fun
{
if (GetMinix(imagePlugin, lbaStart, divider, sectorOffset, sectorSize, out List <Partition> mnxParts))
{
partitions.AddRange(mnxParts);
}
else
{
minix = false;
}
}
if (valid && !minix)
{
Partition part = new Partition();
if ((lbaStart > 0 || imagePlugin.Info.XmlMediaType == XmlMediaType.OpticalDisc) &&
lbaSectors > 0)
{
part.Start = lbaStart + sectorOffset;
part.Length = lbaSectors;
part.Offset = part.Start * sectorSize;
part.Size = part.Length * sectorSize;
}
else
{
valid = false;
}
if (valid)
{
part.Type = $"0x{entry.type:X2}";
part.Name = DecodeMbrType(entry.type);
part.Sequence = counter;
part.Description = entry.status == 0x80 ? "Partition is bootable." : "";
part.Scheme = Name;
counter++;
partitions.Add(part);
}
}
DicConsole.DebugWriteLine("MBR plugin", "entry.extended = {0}", extended);
if (!extended)
{
continue;
}
bool processingExtended = true;
ulong chainStart = lbaStart;
while (processingExtended)
{
sector = imagePlugin.ReadSector(lbaStart);
handle = GCHandle.Alloc(sector, GCHandleType.Pinned);
ExtendedBootRecord ebr =
(ExtendedBootRecord)Marshal.PtrToStructure(handle.AddrOfPinnedObject(),
typeof(ExtendedBootRecord));
handle.Free();
DicConsole.DebugWriteLine("MBR plugin", "ebr.magic == MBR_Magic = {0}", ebr.magic == MBR_MAGIC);
if (ebr.magic != MBR_MAGIC)
{
break;
}
ulong nextStart = 0;
foreach (MbrPartitionEntry ebrEntry in ebr.entries)
{
bool extValid = true;
startSector = (byte)(ebrEntry.start_sector & 0x3F);
startCylinder = (ushort)(((ebrEntry.start_sector & 0xC0) << 2) | ebrEntry.start_cylinder);
endSector = (byte)(ebrEntry.end_sector & 0x3F);
endCylinder = (ushort)(((ebrEntry.end_sector & 0xC0) << 2) | ebrEntry.end_cylinder);
ulong extStart = ebrEntry.lba_start;
ulong extSectors = ebrEntry.lba_sectors;
bool extMinix = false;
DicConsole.DebugWriteLine("MBR plugin", "ebr_entry.status {0}", ebrEntry.status);
DicConsole.DebugWriteLine("MBR plugin", "ebr_entry.type {0}", ebrEntry.type);
DicConsole.DebugWriteLine("MBR plugin", "ebr_entry.lba_start {0}", ebrEntry.lba_start);
DicConsole.DebugWriteLine("MBR plugin", "ebr_entry.lba_sectors {0}", ebrEntry.lba_sectors);
DicConsole.DebugWriteLine("MBR plugin", "ebr_entry.start_cylinder {0}", startCylinder);
DicConsole.DebugWriteLine("MBR plugin", "ebr_entry.start_head {0}", ebrEntry.start_head);
DicConsole.DebugWriteLine("MBR plugin", "ebr_entry.start_sector {0}", startSector);
DicConsole.DebugWriteLine("MBR plugin", "ebr_entry.end_cylinder {0}", endCylinder);
DicConsole.DebugWriteLine("MBR plugin", "ebr_entry.end_head {0}", ebrEntry.end_head);
DicConsole.DebugWriteLine("MBR plugin", "ebr_entry.end_sector {0}", endSector);
// Let's start the fun...
extValid &= ebrEntry.status == 0x00 || ebrEntry.status == 0x80;
extValid &= ebrEntry.type != 0x00;
extValid &= ebrEntry.lba_start != 0 || ebrEntry.lba_sectors != 0 ||
ebrEntry.start_cylinder != 0 || ebrEntry.start_head != 0 ||
ebrEntry.start_sector != 0 || ebrEntry.end_cylinder != 0 ||
ebrEntry.end_head != 0 || ebrEntry.end_sector != 0;
if (ebrEntry.lba_start == 0 && ebrEntry.lba_sectors == 0 && extValid)
{
extStart = CHS.ToLBA(startCylinder, ebrEntry.start_head, startSector,
imagePlugin.Info.Heads, imagePlugin.Info.SectorsPerTrack);
extSectors = CHS.ToLBA(endCylinder, ebrEntry.end_head, ebrEntry.end_sector,
imagePlugin.Info.Heads, imagePlugin.Info.SectorsPerTrack) -
extStart;
}
extMinix |= ebrEntry.type == 0x81 || ebrEntry.type == 0x80;
// For optical media
extStart /= divider;
extSectors /= divider;
DicConsole.DebugWriteLine("MBR plugin", "ext_start {0}", extStart);
DicConsole.DebugWriteLine("MBR plugin", "ext_sectors {0}", extSectors);
if (ebrEntry.type == 0x05 || ebrEntry.type == 0x0F || ebrEntry.type == 0x15 ||
ebrEntry.type == 0x1F || ebrEntry.type == 0x85 || ebrEntry.type == 0x91 ||
ebrEntry.type == 0x9B || ebrEntry.type == 0xC5 || ebrEntry.type == 0xCF ||
ebrEntry.type == 0xD5)
{
extValid = false;
nextStart = chainStart + extStart;
}
extStart += lbaStart;
extValid &= extStart <= imagePlugin.Info.Sectors;
// Some buggy implementations do some rounding errors getting a few sectors beyond device size
if (extStart + extSectors > imagePlugin.Info.Sectors)
{
extSectors = imagePlugin.Info.Sectors - extStart;
}
if (extValid && extMinix) // Let's mix the fun
{
if (GetMinix(imagePlugin, lbaStart, divider, sectorOffset, sectorSize,
out List <Partition> mnxParts))
{
partitions.AddRange(mnxParts);
}
else
{
extMinix = false;
}
}
if (!extValid || extMinix)
{
continue;
}
Partition part = new Partition();
if (extStart > 0 && extSectors > 0)
{
part.Start = extStart + sectorOffset;
part.Length = extSectors;
part.Offset = part.Start * sectorSize;
part.Size = part.Length * sectorSize;
}
else
{
extValid = false;
}
if (!extValid)
{
continue;
}
part.Type = $"0x{ebrEntry.type:X2}";
part.Name = DecodeMbrType(ebrEntry.type);
part.Sequence = counter;
part.Description = ebrEntry.status == 0x80 ? "Partition is bootable." : "";
part.Scheme = Name;
counter++;
partitions.Add(part);
}
DicConsole.DebugWriteLine("MBR plugin", "next_start {0}", nextStart);
processingExtended &= nextStart != 0;
processingExtended &= nextStart <= imagePlugin.Info.Sectors;
lbaStart = nextStart;
}
}
// An empty MBR may exist, NeXT creates one and then hardcodes its disklabel
return(partitions.Count != 0);
}
