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 static FeatureCollection FromFlatGeobuf(byte[] bytes)
{
var fc = new NetTopologySuite.Features.FeatureCollection();
var bb = new ByteBuffer(bytes);
var headerSize = ByteBufferUtil.GetSizePrefix(bb);
bb.Position = FlatBufferConstants.SizePrefixLength;
var header = Header.GetRootAsHeader(bb);
var count = header.FeaturesCount;
var nodeSize = header.IndexNodeSize;
var geometryType = header.GeometryType;
var dimensions = header.Dimensions;
IList <ColumnMeta> columns = null;
if (header.ColumnsLength > 0)
{
columns = new List <ColumnMeta>();
for (int i = 0; i < header.ColumnsLength; i++)
{
var column = header.Columns(i).Value;
columns.Add(new ColumnMeta()
{
Name = column.Name, Type = column.Type
});
}
}
bb.Position += headerSize;
if (nodeSize > 0)
{
var index = new PackedHilbertRTree(count, nodeSize);
var indexData = bytes.Skip(headerSize).Take((int)index.Size).ToArray();
index.Load(indexData);
bb.Position += (int)index.Size + (int)count * 8;
}
while (bb.Position < bb.Length)
{
var featureLength = ByteBufferUtil.GetSizePrefix(bb);
bb.Position += FlatBufferConstants.SizePrefixLength;
var feature = FeatureConversions.FromByteBuffer(bb, geometryType, dimensions, columns);
fc.Add(feature);
bb.Position += featureLength;
}
return(fc);
}
private void CanCreateNewFlatBufferFromScratch(bool sizePrefix)
{
// Second, let's create a FlatBuffer from scratch in C#, and test it also.
// We use an initial size of 1 to exercise the reallocation algorithm,
// normally a size larger than the typical FlatBuffer you generate would be
// better for performance.
var fbb = new FlatBufferBuilder(1);
StringOffset[] names = { fbb.CreateString("Frodo"), fbb.CreateString("Barney"), fbb.CreateString("Wilma") };
Offset <Monster>[] off = new Offset <Monster> [3];
Monster.StartMonster(fbb);
Monster.AddName(fbb, names[0]);
off[0] = Monster.EndMonster(fbb);
Monster.StartMonster(fbb);
Monster.AddName(fbb, names[1]);
off[1] = Monster.EndMonster(fbb);
Monster.StartMonster(fbb);
Monster.AddName(fbb, names[2]);
off[2] = Monster.EndMonster(fbb);
var sortMons = Monster.CreateSortedVectorOfMonster(fbb, off);
// We set up the same values as monsterdata.json:
var str = fbb.CreateString("MyMonster");
var test1 = fbb.CreateString("test1");
var test2 = fbb.CreateString("test2");
Monster.StartInventoryVector(fbb, 5);
for (int i = 4; i >= 0; i--)
{
fbb.AddByte((byte)i);
}
var inv = fbb.EndVector();
var fred = fbb.CreateString("Fred");
Monster.StartMonster(fbb);
Monster.AddName(fbb, fred);
var mon2 = Monster.EndMonster(fbb);
Monster.StartTest4Vector(fbb, 2);
MyGame.Example.Test.CreateTest(fbb, (short)10, (sbyte)20);
MyGame.Example.Test.CreateTest(fbb, (short)30, (sbyte)40);
var test4 = fbb.EndVector();
Monster.StartTestarrayofstringVector(fbb, 2);
fbb.AddOffset(test2.Value);
fbb.AddOffset(test1.Value);
var testArrayOfString = fbb.EndVector();
Monster.StartMonster(fbb);
Monster.AddPos(fbb, Vec3.CreateVec3(fbb, 1.0f, 2.0f, 3.0f, 3.0,
Color.Green, (short)5, (sbyte)6));
Monster.AddHp(fbb, (short)80);
Monster.AddName(fbb, str);
Monster.AddInventory(fbb, inv);
Monster.AddTestType(fbb, Any.Monster);
Monster.AddTest(fbb, mon2.Value);
Monster.AddTest4(fbb, test4);
Monster.AddTestarrayofstring(fbb, testArrayOfString);
Monster.AddTestbool(fbb, true);
Monster.AddTestarrayoftables(fbb, sortMons);
var mon = Monster.EndMonster(fbb);
if (sizePrefix)
{
Monster.FinishSizePrefixedMonsterBuffer(fbb, mon);
}
else
{
Monster.FinishMonsterBuffer(fbb, mon);
}
// Dump to output directory so we can inspect later, if needed
#if ENABLE_SPAN_T
var data = fbb.DataBuffer.ToSizedArray();
string filename = @"Resources/monsterdata_cstest" + (sizePrefix ? "_sp" : "") + ".mon";
File.WriteAllBytes(filename, data);
#else
using (var ms = fbb.DataBuffer.ToMemoryStream(fbb.DataBuffer.Position, fbb.Offset))
{
var data = ms.ToArray();
string filename = @"Resources/monsterdata_cstest" + (sizePrefix ? "_sp" : "") + ".mon";
File.WriteAllBytes(filename, data);
}
#endif
// Remove the size prefix if necessary for further testing
ByteBuffer dataBuffer = fbb.DataBuffer;
if (sizePrefix)
{
Assert.AreEqual(ByteBufferUtil.GetSizePrefix(dataBuffer) + FlatBufferConstants.SizePrefixLength,
dataBuffer.Length - dataBuffer.Position);
dataBuffer = ByteBufferUtil.RemoveSizePrefix(dataBuffer);
}
// Now assert the buffer
TestBuffer(dataBuffer);
//Attempt to mutate Monster fields and check whether the buffer has been mutated properly
// revert to original values after testing
Monster monster = Monster.GetRootAsMonster(dataBuffer);
// mana is optional and does not exist in the buffer so the mutation should fail
// the mana field should retain its default value
Assert.AreEqual(monster.MutateMana((short)10), false);
Assert.AreEqual(monster.Mana, (short)150);
// Accessing a vector of sorted by the key tables
Assert.AreEqual(monster.Testarrayoftables(0).Value.Name, "Barney");
Assert.AreEqual(monster.Testarrayoftables(1).Value.Name, "Frodo");
Assert.AreEqual(monster.Testarrayoftables(2).Value.Name, "Wilma");
// Example of searching for a table by the key
Assert.IsTrue(monster.TestarrayoftablesByKey("Frodo") != null);
Assert.IsTrue(monster.TestarrayoftablesByKey("Barney") != null);
Assert.IsTrue(monster.TestarrayoftablesByKey("Wilma") != null);
// testType is an existing field
Assert.AreEqual(monster.TestType, Any.Monster);
//mutate the inventory vector
Assert.AreEqual(monster.MutateInventory(0, 1), true);
Assert.AreEqual(monster.MutateInventory(1, 2), true);
Assert.AreEqual(monster.MutateInventory(2, 3), true);
Assert.AreEqual(monster.MutateInventory(3, 4), true);
Assert.AreEqual(monster.MutateInventory(4, 5), true);
for (int i = 0; i < monster.InventoryLength; i++)
{
Assert.AreEqual(monster.Inventory(i), i + 1);
}
//reverse mutation
Assert.AreEqual(monster.MutateInventory(0, 0), true);
Assert.AreEqual(monster.MutateInventory(1, 1), true);
Assert.AreEqual(monster.MutateInventory(2, 2), true);
Assert.AreEqual(monster.MutateInventory(3, 3), true);
Assert.AreEqual(monster.MutateInventory(4, 4), true);
// get a struct field and edit one of its fields
Vec3 pos = (Vec3)monster.Pos;
Assert.AreEqual(pos.X, 1.0f);
pos.MutateX(55.0f);
Assert.AreEqual(pos.X, 55.0f);
pos.MutateX(1.0f);
Assert.AreEqual(pos.X, 1.0f);
TestBuffer(dataBuffer);
TestObjectAPI(Monster.GetRootAsMonster(dataBuffer));
}
