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function typeName(typedArrayCtor) {
return typedArrayCtor.name.slice(0, -"Array".length);
}
const nativeIsLittleEndian = new Uint8Array(new Uint16Array([1]).buffer)[0] === 1;
function toEndianess(type, v, littleEndian) {
// Disable Ion compilation to call the native, non-inlined DataView functions.
with ({}); // no-ion
assertEq(inIon() !== true, true);
let dv = new DataView(new ArrayBuffer(type.BYTES_PER_ELEMENT));
let name = typeName(type);
dv[`set${name}`](0, v, nativeIsLittleEndian);
return dv[`get${name}`](0, littleEndian);
}
function toLittleEndian(type, v) {
return toEndianess(type, v, true);
}
function toBigEndian(type, v) {
return toEndianess(type, v, false);
}
// Shared test data for various DataView tests.
function createTestData() {
const tests = [
{
type: Int8Array,
values: [-128, -127, -2, -1, 0, 1, 2, 126, 127],
},
{
type: Uint8Array,
values: [0, 1, 2, 126, 127, 128, 254, 255],
},
{
type: Int16Array,
values: [-32768, -32767, -2, -1, 0, 1, 2, 32766, 32767],
},
{
type: Uint16Array,
values: [0, 1, 2, 32766, 32767, 32768, 65534, 65535],
},
{
type: Int32Array,
values: [-2147483648, -2147483647, -2, -1, 0, 1, 2, 2147483646, 2147483647],
},
{
type: Uint32Array,
values: [0, 1, 2, 2147483646, 2147483647], // Representable as Int32
},
{
type: Uint32Array,
values: [0, 1, 2, 2147483646, 2147483647, 2147483648, 4294967294, 4294967295],
},
{
type: Float32Array,
values: [-NaN, -Infinity, -0.5, -0, +0, 0.5, Infinity, NaN],
},
{
type: Float64Array,
values: [-NaN, -Infinity, -0.5, -0, +0, 0.5, Infinity, NaN],
},
{
type: BigInt64Array,
values: [-9223372036854775808n, -9223372036854775807n, -2n, -1n, 0n, 1n, 2n, 9223372036854775806n, 9223372036854775807n],
},
{
type: BigUint64Array,
values: [0n, 1n, 2n, 9223372036854775806n, 9223372036854775807n, 9223372036854775808n, 18446744073709551614n, 18446744073709551615n],
},
];
tests.forEach(data => {
data.littleEndian = data.values.map(v => toLittleEndian(data.type, v));
data.bigEndian = data.values.map(v => toBigEndian(data.type, v));
});
return tests;
}