public IndexNode(IndexNodeSaveFn store, int storeOverhead, Index index, bool isRoot, byte[] buffer, int offset)
{
_store = store;
_storageOverhead = storeOverhead;
_index = index;
_isRoot = isRoot;
_header = new IndexHeader(buffer, offset + 0);
_totalSpaceAvailable = _header.AllocatedSizeOfEntries;
_entries = new List<IndexEntry>();
int pos = (int)_header.OffsetToFirstEntry;
while (pos < _header.TotalSizeOfEntries)
{
IndexEntry entry = new IndexEntry(index.IsFileIndex);
entry.Read(buffer, offset + pos);
_entries.Add(entry);
if ((entry.Flags & IndexEntryFlags.End) != 0)
{
break;
}
pos += entry.Size;
}
}
public IndexBlock(Index index, bool isRoot, IndexEntry parentEntry, BiosParameterBlock bpb)
: base("INDX", bpb.BytesPerSector)
{
_index = index;
_isRoot = isRoot;
Stream stream = index.AllocationStream;
_streamPosition = parentEntry.ChildrenVirtualCluster * bpb.BytesPerSector * bpb.SectorsPerCluster;
stream.Position = _streamPosition;
byte[] buffer = Utilities.ReadFully(stream, (int)index.IndexBufferSize);
FromBytes(buffer, 0);
}
private IndexBlock(Index index, bool isRoot, long vcn, BiosParameterBlock bpb)
: base("INDX", bpb.BytesPerSector, bpb.IndexBufferSize)
{
_index = index;
_isRoot = isRoot;
_indexBlockVcn = (ulong)vcn;
_streamPosition = vcn * bpb.BytesPerSector * bpb.SectorsPerCluster;
_node = new IndexNode(WriteToDisk, UpdateSequenceSize, _index, isRoot, (uint)bpb.IndexBufferSize - FieldSize);
WriteToDisk();
}
public IndexNode(IndexNodeSaveFn store, int storeOverhead, Index index, bool isRoot, uint allocatedSize)
{
_store = store;
_storageOverhead = storeOverhead;
_index = index;
_isRoot = isRoot;
_header = new IndexHeader(allocatedSize);
_totalSpaceAvailable = allocatedSize;
IndexEntry endEntry = new IndexEntry(_index.IsFileIndex);
endEntry.Flags |= IndexEntryFlags.End;
_entries = new List<IndexEntry>();
_entries.Add(endEntry);
_header.OffsetToFirstEntry = (uint)(IndexHeader.Size + storeOverhead);
_header.TotalSizeOfEntries = (uint)(_header.OffsetToFirstEntry + endEntry.Size);
}
internal static IndexBlock Initialize(Index index, bool isRoot, IndexEntry parentEntry, BiosParameterBlock bpb)
{
return new IndexBlock(index, isRoot, parentEntry.ChildrenVirtualCluster, bpb);
}
public Index GetIndex(string name)
{
Index idx = _indexCache[name];
if (idx == null)
{
idx = new Index(this, name, _context.BiosParameterBlock, _context.UpperCase);
_indexCache[name] = idx;
}
return idx;
}
public static void Create(AttributeType attrType, AttributeCollationRule collationRule, File file, string name)
{
Index idx = new Index(attrType, collationRule, file, name, file.Context.BiosParameterBlock, file.Context.UpperCase);
idx.WriteRootNodeToDisk();
}