public void FsmPage()
{
int pageSize = 32768;
var dummyPageManager = new FileSystemPageManager(pageSize);
var p = new Page(dummyPageManager, 0, new byte[pageSize]);
var fsmh = new FreeSpaceMapPageHeader();
var r = new Random();
PageFormatter.InitPage(p, fsmh);
int fsmEntryCount = PageFormatter.GetFsmEntryCount(p);
// set all values to "full"
PageFormatter.SetAllFsmValues(p, FsmValue.Full);
// check if all values are actually "full"
for (int i = 0; i < fsmEntryCount; i++)
{
Assert.AreEqual(FsmValue.Full, PageFormatter.GetFsmValue(p, i));
}
var values = new FsmValue[fsmEntryCount];
// set and keep random values
for (int i = 0; i < fsmEntryCount; i++)
{
var value = (byte)r.Next((byte)FsmValue.Full + 1);
PageFormatter.SetFsmValue(p, i, (FsmValue)value);
values[i] = (FsmValue)value;
}
// compare it
for (int i = 0; i < fsmEntryCount; i++)
{
Assert.AreEqual(values[i], PageFormatter.GetFsmValue(p, i));
}
}
public void Set(long pageIndex, FsmValue value)
{
if (!_isInitialized)
{
Init();
}
IPage page = GetFsmPageByTargetPageIndex(pageIndex);
if (page == null)
{
// fsm-page is missing for requested page index
long previousPageIndex = _lastFsmPage.Index;
var missingPageCount = (int)((pageIndex - (_fsmPageCount - _fsmPageIndexes.Count) * _entryPerPage) / _entryPerPage + 1);
var pages = new List <IPage>(missingPageCount);
// allocate new pages
for (int i = 0; i < missingPageCount; i++)
{
pages.Add(_pageManager.CreatePage());
}
var baseIndex = PageFormatter.GetBasePageIndex(_lastFsmPage);
// initialize them
for (int i = 0; i < missingPageCount; i++)
{
baseIndex += _entryPerPage;
InitFsmPage(pages[i],
previousPageIndex,
i == missingPageCount - 1 ? -1 : pages[i + 1].Index,
baseIndex);
previousPageIndex = pages[i].Index;
}
// and update
pages.ForEach(_pageManager.UpdatePage);
// save reference to added pages
var lastPageHeader = (FreeSpaceMapPageHeader)PageFormatter.GetPageHeader(_lastFsmPage);
lastPageHeader.NextPageIndex = pages[0].Index;
lastPageHeader.WriteToPage(_lastFsmPage);
_pageManager.UpdatePage(_lastFsmPage);
_lastFsmPage = null;
_fsmPageCount = -1;
Set(pageIndex, value);
}
else
{
PageFormatter.SetFsmValue(page, (int)pageIndex % _entryPerPage, value);
_pageManager.UpdatePage(page);
var fsmValuesToUpdate = _luckyFsmPages.Where(item => item.Value.Page.Index == page.Index).Select(item => item.Key).ToList();
foreach (var fsmValue in fsmValuesToUpdate)
{
_luckyFsmPages[fsmValue].Page = page;
}
if (!_luckyFsmPages.ContainsKey(value))
{
_luckyFsmPages[value] = new LuckyPage {
Page = page, LastGoodIndex = pageIndex
}
}
;
else
{
if (_scanned.Contains(value))
{
_scanned.Remove(value);
}
}
}
}
