| /* |
| * Copyright (c) 2013, 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. |
| */ |
| /** |
| * @assertion |
| * double getFloat32( |
| * int byteOffset, [ |
| * Endian endian = Endian.big |
| * ]) |
| * Returns the floating point number represented by the four bytes at the |
| * specified [byteOffset] in this object, in IEEE 754 single-precision binary |
| * floating-point format (binary32). |
| * @description Checks that the correct value is returned. |
| * @author msyabro |
| */ |
| |
| import "dart:typed_data"; |
| import "../../../Utils/expect.dart"; |
| |
| main() { |
| var f32 = new Float32List.fromList([ |
| .0, .12, 0.123e32, -0.312e-31, 10.0, 1.401298464324817e-45, |
| 1.1754943508222875e-38 |
| ]); |
| var u32 = new Uint32List.fromList( |
| [0x62e7a17b, 0xf7ec7100, 0xe7180101, 0x1f83ccbb]); |
| var sizeInBytes = Float32List.bytesPerElement; |
| |
| var byteDataFromF32 = new ByteData.view(f32.buffer); |
| for (int i = 0; i < byteDataFromF32.lengthInBytes / sizeInBytes; ++i) { |
| Expect.approxEquals(f32[i], byteDataFromF32.getFloat32(i * sizeInBytes, |
| Endian.little),(f32[i] / 1e7).abs()); |
| } |
| |
| var byteDataFromU32 = new ByteData.view(u32.buffer); |
| var expectedBigEndian = [ |
| 1.6813055904049544e+36, 1.0462418034594343e-38, |
| 2.3711424564181874e-38, -0.006241216789931059 |
| ]; |
| var expectedLittleEndian = [ |
| 2.136416887544574e+21, -9.591202897651812e+33, |
| -7.178182241978538e+23, 5.581935619425446e-20 |
| ]; |
| for (int i = 0; i < byteDataFromU32.lengthInBytes / sizeInBytes; ++i) { |
| Expect.approxEquals(expectedBigEndian[i], |
| byteDataFromU32.getFloat32(i * sizeInBytes, Endian.big), |
| (expectedBigEndian[i] / 1e7).abs()); |
| Expect.approxEquals(expectedLittleEndian[i], |
| byteDataFromU32.getFloat32(i * sizeInBytes, Endian.little), |
| (expectedLittleEndian[i] / 1e7).abs()); |
| } |
| } |