| /* |
| * 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 getFloat64(int byteOffset, [Endianness endian = Endianness.BIG_ENDIAN]) |
| * Returns the floating point number represented by the eight bytes at |
| * the specified [byteOffset] in this object, in IEEE 754 |
| * double-precision binary floating-point format (binary64). |
| * @description Checks that the correct value is returned. |
| * @author msyabro |
| */ |
| |
| import "dart:typed_data"; |
| import "../../../Utils/expect.dart"; |
| |
| main() { |
| var f64 = new Float64List.fromList([.0, .12, 0.123e32, -0.312e-31, 10.0, 1.7976931348623157e308, 4.9e-324]); |
| var u32 = new Uint32List.fromList([0x62e7a17b, 0xf7ec7100, 0xe7180101, 0x1f83ccbb]); |
| var sizeInBytes = Float64List.BYTES_PER_ELEMENT; |
| |
| var byteDataFromF64 = new ByteData.view(f64.buffer); |
| for(int i = 0; i < byteDataFromF64.lengthInBytes / sizeInBytes; ++i) { |
| Expect.approxEquals(f64[i], byteDataFromF64.getFloat64(i*sizeInBytes, Endianness.LITTLE_ENDIAN),(f64[i]/1e7).abs()); |
| } |
| |
| var byteDataFromU32 = new ByteData.view(u32.buffer); |
| var expectedBigEndian = [3.4077838751557705e+287, 7.791149889961446e-304]; |
| var expectedLittleEndian = [-4.6954507793991304e+269, 7.210606615111715e-157]; |
| for(int i = 0; i < byteDataFromU32.lengthInBytes / sizeInBytes; ++i) { |
| Expect.approxEquals(expectedBigEndian[i], byteDataFromU32.getFloat64(i*sizeInBytes, Endianness.BIG_ENDIAN), |
| (expectedBigEndian[i]/1e7).abs()); |
| Expect.approxEquals(expectedLittleEndian[i], byteDataFromU32.getFloat64(i*sizeInBytes, Endianness.LITTLE_ENDIAN), |
| (expectedLittleEndian[i]/1e7).abs()); |
| } |
| } |