public Page AllocatePage(int num)
{
Page page = _freeSpaceRepository.TryAllocateFromFreeSpace(this, num);
if (page == null) // allocate from end of file
{
if (num > 1)
{
_pager.EnsureContinious(this, NextPageNumber, num);
}
page = _pager.Get(this, NextPageNumber);
page.PageNumber = NextPageNumber;
NextPageNumber += num;
}
page.Lower = (ushort)Constants.PageHeaderSize;
page.Upper = (ushort)_pager.PageSize;
page.Dirty = true;
_dirtyPages[page.PageNumber] = page.PageNumber;
return(page);
}