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// Test aligned write access.
load(libdir + "dataview.js");
// Create a new test function for each scalar type.
function createWrite(data) {
const name = typeName(data.type);
const offset = 0;
return Function("data", `
const {values, littleEndian, bigEndian} = data;
// Load from array so that Ion doesn't treat as constants.
const True = [true, 1];
const False = [false, 0];
const src = new ${data.type.name}(values);
const ab = new ArrayBuffer(${data.type.BYTES_PER_ELEMENT + offset});
const dv = new DataView(ab);
const srcUint8 = new Uint8Array(src.buffer);
const dstUint8 = new Uint8Array(ab);
function assertSameContents(idx, msg) {
for (let i = 0; i < ${data.type.BYTES_PER_ELEMENT}; ++i) {
assertEq(dstUint8[i + ${offset}], srcUint8[i + idx * ${data.type.BYTES_PER_ELEMENT}]);
}
}
for (let i = 0; i < 100; ++i) {
let j = i % values.length;
// Skip over NaNs to avoid false-negatives due to NaN canonicalisation.
if (${name === "Float32" || name === "Float64"}) {
if (Number.isNaN(bigEndian[j]) || Number.isNaN(littleEndian[j])) {
continue;
}
}
dstUint8.fill(0);
dv.set${name}(${offset}, bigEndian[j]);
assertSameContents(j, "default");
dstUint8.fill(0);
dv.set${name}(${offset}, littleEndian[j], true);
assertSameContents(j, "little");
dstUint8.fill(0);
dv.set${name}(${offset}, bigEndian[j], false);
assertSameContents(j, "big");
dstUint8.fill(0);
dv.set${name}(${offset}, littleEndian[j], True[i & 1]);
assertSameContents(j, "little, dynamic");
dstUint8.fill(0);
dv.set${name}(${offset}, bigEndian[j], False[i & 1]);
assertSameContents(j, "big, dynamic");
}
`);
}
for (let data of createTestData()) {
let f = createWrite(data);
for (let i = 0; i < 2; ++i) {
f(data);
}
}
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