private int[] GetOffsetsFromPageMap(HNPAGEMAP pageMap)
{
var offsets = new List <int>();
for (int i = 0; i <= pageMap.AllocationCount; i++)
{
var offset = pageMap.AllocationTable.Take(i * 2, 2);
offsets.Add(offset.ToInt32());
}
return(offsets.ToArray());
}
public IDictionary <HID, BinaryData> Load(int pageIndex, HNPAGEMAP pageMap, BinaryData pageData)
{
var items = new Dictionary <HID, BinaryData>();
var offsets = GetOffsetsFromPageMap(pageMap);
for (int i = 0; i < offsets.Length - 1; i++)
{
var itemData = pageData.Take(offsets[i], offsets[i + 1] - offsets[i]);
var hid = new HID(Constants.NID_TYPE_HID, i + 1, pageIndex);
items.Add(hid, itemData);
}
return(items);
}
private BinaryData EncodeBlock(
ExternalDataBlockForHeapOnNode block,
BinaryData encodedHeader)
{
var pageMap =
new HNPAGEMAP(
block.NumberOfItems + 1,
0,
CreateAllocationTable(block.Items, block.HeaderSize));
return
(BinaryDataGenerator
.New()
.Append(encodedHeader)
.Append(block.Items)
.FillTo(block.RawByteCountWithoutPageMapWithPadding)
.Append(pageMap, pageMapEncoder)
.GetData());
}
private HNPAGEMAP GetPageMapFromExternalDataBlock(BinaryData block, int pageMapOffset)
{
var hnPageMap = block.Take(pageMapOffset, block.Length - pageMapOffset);
return(HNPAGEMAP.OfValue(hnPageMap));
}
