public static FeatureCollection FromFlatGeobuf(byte[] bytes)
{
var fc = new NetTopologySuite.Features.FeatureCollection();
var bb = new ByteBuffer(bytes);
var headerSize = (ulong)ByteBufferUtil.GetSizePrefix(bb);
bb.Position = FlatBufferConstants.SizePrefixLength;
var header = Header.GetRootAsHeader(bb);
var count = header.FeaturesCount;
var featuresSize = header.FeaturesSize;
var nodeSize = header.IndexNodeSize;
bb.Position += (int)headerSize;
var index = new PackedHilbertRTree(count, nodeSize);
var indexData = bytes.Skip((int)(headerSize + featuresSize)).Take((int)index.Size).ToArray();
index.Load(indexData);
while (count-- > 0)
{
var featureLength = ByteBufferUtil.GetSizePrefix(bb);
bb.Position += FlatBufferConstants.SizePrefixLength;
var feature = FeatureConversions.FromByteBuffer(bb, header);
fc.Add(feature);
bb.Position += featureLength;
}
return(fc);
}
public void SingleItemRoundtripTest()
{
var tree = new PackedHilbertRTree(1);
tree.Add(0, 0, 1, 1);
tree.Finish();
var data = tree.ToBytes();
Assert.AreEqual(tree.Size, (ulong)data.LongLength);
var tree2 = new PackedHilbertRTree(1, 16);
tree2.Load(data);
var list = tree2.Search(0, 0, 1, 1);
Assert.AreEqual(1, list.Count);
}