public BinaryData GetHeapItem(NID[] nodePath, HID hid)
{
var externalBlock = dataTreeReader.Read(nodePath, hid.BlockIndex)[0];
int pageMapOffset;
if (hid.BlockIndex == 0)
{
var hnHDR = HNHDR.OfValue(externalBlock.Take(12));
pageMapOffset = hnHDR.PageMapOffset;
}
else if (hid.BlockIndex == 8 || (hid.BlockIndex - 8) % 128 == 0)
{
var hnBitmapHDR = HNBITMAPHDR.OfValue(externalBlock.Take(66));
pageMapOffset = hnBitmapHDR.PageMapOffset;
}
else
{
var hnPageHDR = HNPAGEHDR.OfValue(externalBlock.Take(2));
pageMapOffset = hnPageHDR.PageMapOffset;
}
var pageMap = GetPageMapFromExternalDataBlock(externalBlock, pageMapOffset);
var items = heapOnNodeItemsLoader.Load(hid.BlockIndex, pageMap, externalBlock);
return(items[hid]);
}
private BinaryData EncodeBlockWithNewFillLevel(
ExternalDataBlockForHeapOnNode block,
BinaryData fillLevelsForTheNext128Blocks)
{
var hnBitmapHeader =
new HNBITMAPHDR(
block.RawByteCountWithoutPageMapWithPadding,
fillLevelsForTheNext128Blocks);
return(EncodeBlock(block, bitmapHeaderEncoder.Encode(hnBitmapHeader)));
}
