internal PageEventArgs(UInt64 pageNumber, PageHeader pageHeader)
{
this.PageNumber = pageNumber;
this.PageHeader = pageHeader;
}
public void ParsePage(UInt64 pageNumber)
{
this._pageReader.LoadPage(pageNumber);
if (1 == pageNumber)
{
this._pageReader.Position = 100;
}
var pageType = (PageType)this._pageReader.Read8();
if (PageType.Unused == pageType)
{
return;
}
var pageHeader = new PageHeader();
pageHeader.PageType = pageType;
pageHeader.FirstFreeblockOffset = this._pageReader.Read16();
pageHeader.CellCount = this._pageReader.Read16();
pageHeader.CellContentAreaOffset = this._pageReader.Read16();
pageHeader.FragmentedFreeBytesCount = this._pageReader.Read8();
if ((PageType.IndexInterior == pageType) || (PageType.TableInterior == pageType))
{
pageHeader.RightMostPointer = this._pageReader.Read32();
}
var pageEventArgs = new PageEventArgs(pageNumber, pageHeader);
this.PageStarted?.Invoke(this, pageEventArgs);
var cellPointerArrayOffset = this._pageReader.Position;
for (var cellNumber = 0UL; cellNumber < pageHeader.CellCount; cellNumber++)
{
var cellHeader = new CellHeader();
cellHeader.PageType = pageType;
this._pageReader.Position = cellPointerArrayOffset;
cellPointerArrayOffset += 2;
var cellOffset = this._pageReader.Read16();
this._pageReader.Position = cellOffset;
if (PageType.IndexInterior == pageType)
{
cellHeader.LeftChildPage = this._pageReader.Read32();
cellHeader.PayloadSize = this._pageReader.Decode64();
}
else if (PageType.TableInterior == pageType)
{
cellHeader.LeftChildPage = this._pageReader.Read32();
cellHeader.Rowid = this._pageReader.Decode64();
}
else if (PageType.IndexLeaf == pageType)
{
cellHeader.PayloadSize = this._pageReader.Decode64();
}
else if (PageType.TableLeaf == pageType)
{
cellHeader.PayloadSize = this._pageReader.Decode64();
cellHeader.Rowid = this._pageReader.Decode64();
}
else
{
// TODO
}
this.CellStarted?.Invoke(this, new CellEventArgs(cellNumber, cellHeader));
if ((PageType.IndexInterior == pageType) || (PageType.IndexLeaf == pageType) || (PageType.TableLeaf == pageType))
{
this.ParsePayload(pageNumber, cellNumber, cellHeader);
}
this.CellFinished?.Invoke(this, new CellEventArgs(cellNumber, cellHeader));
}
this.PageFinished?.Invoke(this, pageEventArgs);
}
