public static void ExtendGPTPartition(GPTPartition partition, long numberOfAdditionalExtentSectors)
{
Disk disk = partition.Disk;
GuidPartitionTableHeader primaryHeader = GuidPartitionTableHeader.ReadPrimaryFromDisk(disk);
GuidPartitionTableHeader secondaryHeader = GuidPartitionTableHeader.ReadSecondaryFromDisk(disk, primaryHeader);
if (primaryHeader == null || secondaryHeader == null)
{
throw new NotImplementedException("Cannot extend GPT disk with corrupted header");
}
if (primaryHeader.PartitionArrayCRC32 != secondaryHeader.PartitionArrayCRC32)
{
throw new NotImplementedException("Cannot extend GPT disk with mismatched partition arrays");
}
List <GuidPartitionEntry> entries = GuidPartitionTable.ReadEntriesFromDisk(disk);
foreach (GuidPartitionEntry entry in entries)
{
if ((long)entry.FirstLBA == partition.FirstSector)
{
entry.LastLBA += (ulong)numberOfAdditionalExtentSectors;
GuidPartitionEntry.WriteToDisk(disk, primaryHeader, entry);
GuidPartitionEntry.WriteToDisk(disk, secondaryHeader, entry);
break;
}
}
primaryHeader.PartitionArrayCRC32 = GuidPartitionTable.ComputePartitionArrayCRC32(disk, primaryHeader);
GuidPartitionTableHeader.WriteToDisk(disk, primaryHeader);
secondaryHeader.PartitionArrayCRC32 = GuidPartitionTable.ComputePartitionArrayCRC32(disk, secondaryHeader);
GuidPartitionTableHeader.WriteToDisk(disk, secondaryHeader);
}
private static List <GuidPartitionEntry> ReadEntriesFromDisk(Disk disk, GuidPartitionTableHeader header)
{
int bufferLength = (int)(header.NumberOfPartitionEntries * header.SizeOfPartitionEntry);
int sectorsToRead = (int)Math.Ceiling((double)bufferLength / disk.BytesPerSector);
byte[] buffer = disk.ReadSectors((long)header.PartitionEntriesLBA, sectorsToRead);
if (buffer.Length > bufferLength)
{
buffer = ByteReader.ReadBytes(buffer, 0, bufferLength);
}
uint expectedCRC32 = CRC32.Compute(buffer);
if (header.PartitionArrayCRC32 != expectedCRC32)
{
return(null);
}
int offset = 0;
List <GuidPartitionEntry> result = new List <GuidPartitionEntry>();
for (int index = 0; index < header.NumberOfPartitionEntries; index++)
{
GuidPartitionEntry entry = new GuidPartitionEntry(buffer, offset);
entry.EntryIndex = index;
// Unused entries use Guid.Empty as PartitionTypeGuid
if (entry.PartitionTypeGuid != Guid.Empty)
{
result.Add(entry);
}
offset += (int)header.SizeOfPartitionEntry;
}
return(result);
}
public static void WriteToDisk(Disk disk, GuidPartitionTableHeader header, GuidPartitionEntry entry)
{
long sectorIndex = (long)header.PartitionEntriesLBA + entry.EntryIndex * header.SizeOfPartitionEntry / disk.BytesPerSector;
int entriesPerSector = (int)(disk.BytesPerSector / header.SizeOfPartitionEntry);
int indexInSector = (int)(entry.EntryIndex % entriesPerSector);
byte[] buffer = disk.ReadSector(sectorIndex);
entry.WriteBytes(buffer, indexInSector * (int)header.SizeOfPartitionEntry);
disk.WriteSectors(sectorIndex, buffer);
}
public static void InitializeDisk(Disk disk, long firstUsableLBA, long reservedPartitionSizeLBA)
{
if (reservedPartitionSizeLBA > 0 && reservedPartitionSizeLBA * disk.BytesPerSector < 1024 * 1024)
{
// The LDM database will take 1MB out of the reserved partition.
// less than 1MB will cause the conversion to dynamic disk to fail.
throw new ArgumentException("Reserved partition size must be at least 1MB");
}
List <GuidPartitionEntry> partitionEntries = new List <GuidPartitionEntry>();
if (reservedPartitionSizeLBA > 0)
{
GuidPartitionEntry reservedEntry = new GuidPartitionEntry();
reservedEntry.PartitionGuid = Guid.NewGuid();
reservedEntry.PartitionTypeGuid = GPTPartition.MicrosoftReservedPartititionTypeGuid;
reservedEntry.FirstLBA = (ulong)firstUsableLBA;
reservedEntry.LastLBA = (ulong)(firstUsableLBA + reservedPartitionSizeLBA - 1);
reservedEntry.PartitionName = "Microsoft reserved partition";
partitionEntries.Add(reservedEntry);
}
InitializeDisk(disk, firstUsableLBA, partitionEntries);
}