public FileSystem(uint sectors, uint minIndexNodes)
{
//Ensure index nodes use whole sectors
minIndexNodes += 8 - minIndexNodes % 8;
Header = new Header()
{
Sectors = sectors,
IndexNodes = minIndexNodes,
VersionMajor = 1,
VersionMinor = 0
};
IndexNodes = new IndexNode[minIndexNodes];
var dataSectors = Header.Sectors - Header.IndexSectors - 1;
var bitmapSectors = 0U;
while (bitmapSectors * (512 * 8) < dataSectors)
{
bitmapSectors++;
dataSectors--;
}
Bitmap = new SectorBitmap(dataSectors);
Header.BitmapLength = (uint)Bitmap.Bitmap.LongLength;
Header.BitmapSectors = Bitmap.BitmapSectors;
DataSectors = new DataSector[dataSectors];
}
public void InsertIndexNode(IndexNode node)
{
var index = Array.FindIndex(
IndexNodes,
x => x == null || !x.Flags.HasFlag(IndexFlags.Valid)
);
if (index == -1)
{
throw new InvalidOperationException("Exausted index nodes");
}
IndexNodes[index] = node;
}
public IndexNode GetIndexByPath(string filePath)
{
var path = ("/" + (filePath.TrimStart('/'))).Split('/');
IndexNode node = null;
for (var i = 0; i < path.Length; i++)
{
var parentId = node == null ? 0 : node.ID;
node = IndexNodes.FirstOrDefault(x => x != null && x.ParentID == parentId && x.Name == path[i]);
if (node == null)
{
return(null);
}
}
return(node);
}