private void EstablishReservedPartition(List <GptEntry> allEntries) { // If no MicrosoftReserved partition, and no Microsoft Data partitions, and the disk // has a 'reasonable' size free, create a Microsoft Reserved partition. if (CountEntries(allEntries, e => e.PartitionType == GuidPartitionTypes.MicrosoftReserved) == 0 && CountEntries(allEntries, e => e.PartitionType == GuidPartitionTypes.WindowsBasicData) == 0 && _diskGeometry.Capacity > 512 * 1024 * 1024) { long reservedStart = FirstAvailableSector(allEntries); long reservedEnd = FindLastFreeSector(reservedStart, allEntries); if ((reservedEnd - reservedStart + 1) * _diskGeometry.BytesPerSector > 512 * 1024 * 1024) { long size = ((_diskGeometry.Capacity < (16 * 1024L * 1024 * 1024)) ? 32 : 128) * 1024 * 1024; reservedEnd = reservedStart + (size / _diskGeometry.BytesPerSector) - 1; int reservedOffset = GetFreeEntryOffset(); GptEntry newReservedEntry = new GptEntry(); newReservedEntry.PartitionType = GuidPartitionTypes.MicrosoftReserved; newReservedEntry.Identity = Guid.NewGuid(); newReservedEntry.FirstUsedLogicalBlock = reservedStart; newReservedEntry.LastUsedLogicalBlock = reservedEnd; newReservedEntry.Attributes = 0; newReservedEntry.Name = "Microsoft reserved partition"; newReservedEntry.WriteTo(_entryBuffer, reservedOffset); allEntries.Add(newReservedEntry); } } }
private int GetPartitionOffset(int index) { bool found = false; int entriesSoFar = 0; int position = 0; while (!found && position < _primaryHeader.PartitionEntryCount) { GptEntry entry = new GptEntry(); entry.ReadFrom(_entryBuffer, position * _primaryHeader.PartitionEntrySize); if (entry.PartitionType != Guid.Empty) { if (index == entriesSoFar) { found = true; break; } entriesSoFar++; } position++; } if (found) { return(position * _primaryHeader.PartitionEntrySize); } else { throw new IOException(string.Format(CultureInfo.InvariantCulture, "No such partition: {0}", index)); } }
internal SparseStream Open(GptEntry entry) { long start = entry.FirstUsedLogicalBlock * _diskGeometry.BytesPerSector; long end = entry.LastUsedLogicalBlock * _diskGeometry.BytesPerSector; return(new SubStream(_diskData, start, end - start)); }
private IEnumerable <GptEntry> GetAllEntries() { for (int i = 0; i < _primaryHeader.PartitionEntryCount; ++i) { GptEntry entry = new GptEntry(); entry.ReadFrom(_entryBuffer, i * _primaryHeader.PartitionEntrySize); if (entry.PartitionType != Guid.Empty) { yield return(entry); } } }
private int GetFreeEntryOffset() { for (int i = 0; i < _primaryHeader.PartitionEntryCount; ++i) { GptEntry entry = new GptEntry(); entry.ReadFrom(_entryBuffer, i * _primaryHeader.PartitionEntrySize); if (entry.PartitionType == Guid.Empty) { return(i * _primaryHeader.PartitionEntrySize); } } throw new IOException("No free partition entries available"); }
private int GetEntryIndex(Guid identity) { int index = 0; for (int i = 0; i < _primaryHeader.PartitionEntryCount; ++i) { GptEntry entry = new GptEntry(); entry.ReadFrom(_entryBuffer, i * _primaryHeader.PartitionEntrySize); if (entry.Identity == identity) { return(index); } else if (entry.PartitionType != Guid.Empty) { index++; } } throw new IOException("No such partition"); }
private GptEntry CreateEntry(long startSector, long endSector, Guid type, long attributes, string name) { if (endSector < startSector) { throw new ArgumentException("The end sector is before the start sector"); } int offset = GetFreeEntryOffset(); GptEntry newEntry = new GptEntry(); newEntry.PartitionType = type; newEntry.Identity = Guid.NewGuid(); newEntry.FirstUsedLogicalBlock = startSector; newEntry.LastUsedLogicalBlock = endSector; newEntry.Attributes = (ulong)attributes; newEntry.Name = name; newEntry.WriteTo(_entryBuffer, offset); // Commit changes to disk Write(); return(newEntry); }
/// <summary> /// Creates a new GUID partition on the disk. /// </summary> /// <param name="startSector">The first sector of the partition.</param> /// <param name="endSector">The last sector of the partition.</param> /// <param name="type">The partition type</param> /// <param name="attributes">The partition attributes</param> /// <param name="name">The name of the partition</param> /// <returns>The index of the new partition</returns> /// <remarks>No checking is performed on the parameters, the caller is /// responsible for ensuring that the partition does not overlap other partitions.</remarks> public int Create(long startSector, long endSector, Guid type, long attributes, string name) { GptEntry newEntry = CreateEntry(startSector, endSector, type, attributes, name); return(GetEntryIndex(newEntry.Identity)); }
internal GuidPartitionInfo(GuidPartitionTable table, GptEntry entry) { _table = table; _entry = entry; }