/// <summary>
/// Tells if the area is in cache
/// </summary>
/// <param name="start">start file position in bytes</param>
/// <param name="length">area length in bytes</param>
/// <returns></returns>
public bool IsAreaCached(long start, long length)
{
if (Complete)
{
return(true);
}
if (length < 0)
{
throw new ArgumentException("length could not be less than zero");
}
if (start < 0)
{
throw new ArgumentException("start could not be less than zero");
}
if (start + length > Magnet.Size)
{
throw new ArgumentException("The area is out of file space");
}
var ind = DownloadItem.GetSegmentIndex(start, SegmentLength);
var total = DownloadItem.SegmentsCount(length, SegmentLength);
return(CachedSegments.FirstFalse(ind, total) == -1);
}
public List <ISnapSegment> FindOrCacheSegments(SceneObject so)
{
if (enable_snap_segments == false)
{
return(null);
}
if (SegmentsCache.ContainsKey(so))
{
CachedSegments c = SegmentsCache[so];
if (c.timestamp == so.Timestamp)
{
return(c.segments);
}
// un-cache
if (c.segments != null)
{
foreach (ISnapSegment pt in c.segments)
{
pt.Destroy();
}
}
SegmentsCache.Remove(so);
}
List <ISnapSegment> vSegments = null;
foreach (ISnapGenerator gen in Generators)
{
if (gen.CanGenerate(so))
{
List <ISnapSegment> v = gen.GenerateSegments(so);
if (v != null && v.Count > 0)
{
if (vSegments == null)
{
vSegments = v;
}
else
{
vSegments.AddRange(v);
}
}
}
}
SegmentsCache[so] = new CachedSegments()
{
segments = vSegments, timestamp = so.Timestamp
};
return(vSegments);
}
