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// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
//
// Dart test program for testing dart:ffi function pointers with struct
// arguments.
//
// SharedObjects=ffi_test_functions
import 'dart:ffi';
import "package:expect/expect.dart";
import "package:ffi/ffi.dart";
import 'coordinate.dart';
import 'dylib_utils.dart';
import 'very_large_struct.dart';
typedef NativeCoordinateOp = Pointer<Coordinate> Function(Pointer<Coordinate>);
void main() {
testFunctionWithStruct();
testFunctionWithStructArray();
testFunctionWithVeryLargeStruct();
}
DynamicLibrary ffiTestFunctions = dlopenPlatformSpecific("ffi_test_functions");
/// pass a struct to a c function and get a struct as return value
void testFunctionWithStruct() {
Pointer<NativeFunction<NativeCoordinateOp>> p1 =
ffiTestFunctions.lookup("TransposeCoordinate");
NativeCoordinateOp f1 = p1.asFunction();
final c1 = calloc<Coordinate>()
..ref.x = 10.0
..ref.y = 20.0;
final c2 = calloc<Coordinate>()
..ref.x = 42.0
..ref.y = 84.0
..ref.next = c1;
c1.ref.next = c2;
Coordinate result = f1(c1).ref;
Expect.approxEquals(20.0, c1.ref.x);
Expect.approxEquals(30.0, c1.ref.y);
Expect.approxEquals(42.0, result.x);
Expect.approxEquals(84.0, result.y);
calloc.free(c1);
calloc.free(c2);
}
/// pass an array of structs to a c funtion
void testFunctionWithStructArray() {
Pointer<NativeFunction<NativeCoordinateOp>> p1 =
ffiTestFunctions.lookup("CoordinateElemAt1");
NativeCoordinateOp f1 = p1.asFunction();
final coordinateArray = calloc<Coordinate>(3);
Coordinate c1 = coordinateArray[0];
Coordinate c2 = coordinateArray[1];
Coordinate c3 = coordinateArray[2];
c1.x = 10.0;
c1.y = 10.0;
c1.next = coordinateArray.elementAt(2);
c2.x = 20.0;
c2.y = 20.0;
c2.next = coordinateArray.elementAt(0);
c3.x = 30.0;
c3.y = 30.0;
c3.next = coordinateArray.elementAt(1);
Coordinate result = f1(coordinateArray.elementAt(0)).ref;
Expect.approxEquals(20.0, result.x);
Expect.approxEquals(20.0, result.y);
calloc.free(coordinateArray);
}
typedef VeryLargeStructSum = int Function(Pointer<VeryLargeStruct>);
typedef NativeVeryLargeStructSum = Int64 Function(Pointer<VeryLargeStruct>);
void testFunctionWithVeryLargeStruct() {
Pointer<NativeFunction<NativeVeryLargeStructSum>> p1 =
ffiTestFunctions.lookup("SumVeryLargeStruct");
VeryLargeStructSum f = p1.asFunction();
final vlsArray = calloc<VeryLargeStruct>(2);
VeryLargeStruct vls1 = vlsArray[0];
VeryLargeStruct vls2 = vlsArray[1];
List<VeryLargeStruct> structs = [vls1, vls2];
for (VeryLargeStruct struct in structs) {
struct.a = 1;
struct.b = 2;
struct.c = 4;
struct.d = 8;
struct.e = 16;
struct.f = 32;
struct.g = 64;
struct.h = 128;
struct.i = 256;
struct.j = 512;
struct.k = 1024;
struct.smallLastField = 1;
}
vls1.parent = vlsArray.elementAt(1);
vls1.numChildren = 2;
vls1.children = vlsArray.elementAt(0);
vls2.parent = vlsArray.elementAt(1);
vls2.parent = nullptr;
vls2.numChildren = 0;
vls2.children = nullptr;
int result = f(vlsArray.elementAt(0));
Expect.equals(2051, result);
result = f(vlsArray.elementAt(1));
Expect.equals(2048, result);
calloc.free(vlsArray);
}