public BTree(IBuffer data)
{
_data = data;
byte[] headerInfo = StreamUtilities.ReadExact(_data, 0, 106);
_header = new BTreeHeaderRecord();
_header.ReadFrom(headerInfo, 14);
byte[] node0data = StreamUtilities.ReadExact(_data, 0, _header.NodeSize);
BTreeHeaderNode node0 = BTreeNode.ReadNode(this, node0data, 0) as BTreeHeaderNode;
node0.ReadFrom(node0data, 0);
if (node0.HeaderRecord.RootNode != 0)
{
_rootNode = GetKeyedNode(node0.HeaderRecord.RootNode);
}
}
protected override IList <BTreeNodeRecord> ReadRecords(byte[] buffer, int offset)
{
int totalRecords = Descriptor.NumRecords;
int nodeSize = Tree.NodeSize;
int headerRecordOffset = EndianUtilities.ToUInt16BigEndian(buffer, nodeSize - 2);
int userDataRecordOffset = EndianUtilities.ToUInt16BigEndian(buffer, nodeSize - 4);
int mapRecordOffset = EndianUtilities.ToUInt16BigEndian(buffer, nodeSize - 6);
BTreeNodeRecord[] results = new BTreeNodeRecord[3];
results[0] = new BTreeHeaderRecord();
results[0].ReadFrom(buffer, offset + headerRecordOffset);
results[1] = new BTreeGenericRecord(mapRecordOffset - userDataRecordOffset);
results[1].ReadFrom(buffer, offset + userDataRecordOffset);
results[2] = new BTreeGenericRecord(nodeSize - (totalRecords * 2 + mapRecordOffset));
results[2].ReadFrom(buffer, offset + mapRecordOffset);
return(results);
}
