public Heap(Stream stream, bool useCompression = false, AllocationStrategy strategy = AllocationStrategy.FromTheCurrentBlock)
{
stream.Seek(0, SeekOrigin.Begin); //support Seek?
Stream = stream;
space = new Space();
used = new Dictionary<long, Pointer>();
reserved = new Dictionary<long, Pointer>();
if (stream.Length < AtomicHeader.SIZE) //create new
{
header = new AtomicHeader();
header.UseCompression = useCompression;
space.Add(new Ptr(AtomicHeader.SIZE, long.MaxValue - AtomicHeader.SIZE));
}
else //open exist (ignore the useCompression flag)
{
header = AtomicHeader.Deserialize(Stream);
stream.Seek(header.SystemData.Position, SeekOrigin.Begin);
Deserialize(new BinaryReader(stream));
//manual alloc header.SystemData
var ptr = space.Alloc(header.SystemData.Size);
if (ptr.Position != header.SystemData.Position)
throw new Exception("Logical error.");
}
Strategy = strategy;
currentVersion++;
}