public bool GetInformation(IMediaImage imagePlugin, out List <Partition> partitions, ulong sectorOffset)
{
partitions = new List <Partition>();
ulong sbSector;
// RISC OS always checks for the partition on 0. Afaik no emulator chains it.
if (sectorOffset != 0)
{
return(false);
}
if (imagePlugin.Info.SectorSize > ADFS_SB_POS)
{
sbSector = 0;
}
else
{
sbSector = ADFS_SB_POS / imagePlugin.Info.SectorSize;
}
byte[] sector = imagePlugin.ReadSector(sbSector);
if (sector.Length < 512)
{
return(false);
}
AcornBootBlock bootBlock = Marshal.ByteArrayToStructureLittleEndian <AcornBootBlock>(sector);
int checksum = 0;
for (int i = 0; i < 0x1FF; i++)
{
checksum = (checksum & 0xFF) + (checksum >> 8) + sector[i];
}
int heads = bootBlock.discRecord.heads + ((bootBlock.discRecord.lowsector >> 6) & 1);
int secCyl = bootBlock.discRecord.spt * heads;
int mapSector = bootBlock.startCylinder * secCyl;
if ((ulong)mapSector >= imagePlugin.Info.Sectors)
{
return(false);
}
byte[] map = imagePlugin.ReadSector((ulong)mapSector);
ulong counter = 0;
if (checksum == bootBlock.checksum)
{
Partition part = new Partition
{
Size =
(ulong)bootBlock.discRecord.disc_size_high * 0x100000000 + bootBlock.discRecord.disc_size,
Length =
((ulong)bootBlock.discRecord.disc_size_high * 0x100000000 +
bootBlock.discRecord.disc_size) / imagePlugin.Info.SectorSize,
Type = "ADFS",
Name = StringHandlers.CToString(bootBlock.discRecord.disc_name,
Encoding.GetEncoding("iso-8859-1"))
};
if (part.Size > 0)
{
partitions.Add(part);
counter++;
}
}
switch (bootBlock.flags & TYPE_MASK)
{
case TYPE_LINUX:
{
LinuxTable table = Marshal.ByteArrayToStructureLittleEndian <LinuxTable>(map);
foreach (LinuxEntry entry in table.entries)
{
Partition part = new Partition
{
Start = (ulong)(mapSector + entry.start),
Size = entry.size,
Length = (ulong)(entry.size * sector.Length),
Sequence = counter,
Scheme = Name
};
part.Offset = part.Start * (ulong)sector.Length;
if (entry.magic != LINUX_MAGIC && entry.magic != SWAP_MAGIC)
{
continue;
}
partitions.Add(part);
counter++;
}
break;
}
case TYPE_RISCIX_MFM:
case TYPE_RISCIX_SCSI:
{
RiscIxTable table = Marshal.ByteArrayToStructureLittleEndian <RiscIxTable>(map);
if (table.magic == RISCIX_MAGIC)
{
foreach (RiscIxEntry entry in table.partitions)
{
Partition part = new Partition
{
Start = (ulong)(mapSector + entry.start),
Size = entry.length,
Length = (ulong)(entry.length * sector.Length),
Name = StringHandlers.CToString(entry.name, Encoding.GetEncoding("iso-8859-1")),
Sequence = counter,
Scheme = Name
};
part.Offset = part.Start * (ulong)sector.Length;
if (entry.length <= 0)
{
continue;
}
partitions.Add(part);
counter++;
}
}
break;
}
}
return(partitions.Count != 0);
}