private void BuildDataTree(Block block, ref long offset)
{
var level = block.Data[1];
if (level != 0x01 && level != 0x02)
{
throw new Exception("Invalid level");
}
var numEntities = block.Data.Segment(2, 2).ToUInt16();
for (var i = 0; i < numEntities; i++)
{
var bid = new Bid(block.Data.Segment(8 + i * 8, 8).ToUInt64());
if (level == 0x02)
{
var b = _reader.FindBlock(bid);
BuildDataTree(b, ref offset);
}
else
{
var b = _reader.LookupBlock(bid);
_dataTree.Add(new DataTreeItem(offset, bid));
offset += b.Length;
}
}
}
private void Initialize()
{
var block = _reader.FindBlock(_node.DataBid);
if (_node.DataBid.Type == BlockType.Internal)
{
BuildDataTreePages(block);
ClientSignature = _pages[0].Data[3];
UserRoot = _pages[0].Data.Derive(4, 4).ToUInt32();
}
else
{
_pages.Add(new HeapPage(block.Data));
ClientSignature = block.Data[3];
UserRoot = block.Data.Segment(4, 4).ToUInt32();
}
}
public State(Bid initialBid, IPstReader reader)
{
_reader = reader;
var block = _reader.FindBlock(initialBid);
if (initialBid.Type == BlockType.External)
{
_dataTree.Add(new DataTreeItem(0, initialBid));
TotalLength = block.Length;
}
else if (block.Data[0] == 0x01) // data tree
{
TotalLength = block.Data.Segment(4, 4).ToUInt32();
long offset = 0;
BuildDataTree(block, ref offset);
}
else
{
throw new Exception("Invalid block data");
}
}
