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test-buffer-arraybuffer.js
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150 lines (127 loc) · 4.05 KB
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'use strict';
const common = require('../common');
const assert = require('assert');
const LENGTH = 16;
const ab = new ArrayBuffer(LENGTH);
const dv = new DataView(ab);
const ui = new Uint8Array(ab);
const buf = Buffer.from(ab);
assert.ok(buf instanceof Buffer);
assert.strictEqual(buf.parent, buf.buffer);
assert.strictEqual(buf.buffer, ab);
assert.strictEqual(buf.length, ab.byteLength);
buf.fill(0xC);
for (let i = 0; i < LENGTH; i++) {
assert.strictEqual(ui[i], 0xC);
ui[i] = 0xF;
assert.strictEqual(buf[i], 0xF);
}
buf.writeUInt32LE(0xF00, 0);
buf.writeUInt32BE(0xB47, 4);
buf.writeDoubleLE(3.1415, 8);
assert.strictEqual(dv.getUint32(0, true), 0xF00);
assert.strictEqual(dv.getUint32(4), 0xB47);
assert.strictEqual(dv.getFloat64(8, true), 3.1415);
// Now test protecting users from doing stupid things
assert.throws(function() {
function AB() { }
Object.setPrototypeOf(AB, ArrayBuffer);
Object.setPrototypeOf(AB.prototype, ArrayBuffer.prototype);
Buffer.from(new AB());
}, TypeError);
// write{Double,Float}{LE,BE} with noAssert should not crash, cf. #3766
const b = Buffer.allocUnsafe(1);
b.writeFloatLE(11.11, 0, true);
b.writeFloatBE(11.11, 0, true);
b.writeDoubleLE(11.11, 0, true);
b.writeDoubleBE(11.11, 0, true);
// Test the byteOffset and length arguments
{
const ab = new Uint8Array(5);
ab[0] = 1;
ab[1] = 2;
ab[2] = 3;
ab[3] = 4;
ab[4] = 5;
const buf = Buffer.from(ab.buffer, 1, 3);
assert.strictEqual(buf.length, 3);
assert.strictEqual(buf[0], 2);
assert.strictEqual(buf[1], 3);
assert.strictEqual(buf[2], 4);
buf[0] = 9;
assert.strictEqual(ab[1], 9);
common.expectsError(() => Buffer.from(ab.buffer, 6), {
code: 'ERR_BUFFER_OUT_OF_BOUNDS',
type: RangeError,
message: '"offset" is outside of buffer bounds'
});
common.expectsError(() => Buffer.from(ab.buffer, 3, 6), {
code: 'ERR_BUFFER_OUT_OF_BOUNDS',
type: RangeError,
message: '"length" is outside of buffer bounds'
});
}
// Test the deprecated Buffer() version also
{
const ab = new Uint8Array(5);
ab[0] = 1;
ab[1] = 2;
ab[2] = 3;
ab[3] = 4;
ab[4] = 5;
const buf = Buffer(ab.buffer, 1, 3);
assert.strictEqual(buf.length, 3);
assert.strictEqual(buf[0], 2);
assert.strictEqual(buf[1], 3);
assert.strictEqual(buf[2], 4);
buf[0] = 9;
assert.strictEqual(ab[1], 9);
common.expectsError(() => Buffer(ab.buffer, 6), {
code: 'ERR_BUFFER_OUT_OF_BOUNDS',
type: RangeError,
message: '"offset" is outside of buffer bounds'
});
common.expectsError(() => Buffer(ab.buffer, 3, 6), {
code: 'ERR_BUFFER_OUT_OF_BOUNDS',
type: RangeError,
message: '"length" is outside of buffer bounds'
});
}
{
// If byteOffset is not numeric, it defaults to 0.
const ab = new ArrayBuffer(10);
const expected = Buffer.from(ab, 0);
assert.deepStrictEqual(Buffer.from(ab, 'fhqwhgads'), expected);
assert.deepStrictEqual(Buffer.from(ab, NaN), expected);
assert.deepStrictEqual(Buffer.from(ab, {}), expected);
assert.deepStrictEqual(Buffer.from(ab, []), expected);
// If byteOffset can be converted to a number, it will be.
assert.deepStrictEqual(Buffer.from(ab, [1]), Buffer.from(ab, 1));
// If byteOffset is Infinity, throw.
common.expectsError(() => {
Buffer.from(ab, Infinity);
}, {
code: 'ERR_BUFFER_OUT_OF_BOUNDS',
type: RangeError,
message: '"offset" is outside of buffer bounds'
});
}
{
// If length is not numeric, it defaults to 0.
const ab = new ArrayBuffer(10);
const expected = Buffer.from(ab, 0, 0);
assert.deepStrictEqual(Buffer.from(ab, 0, 'fhqwhgads'), expected);
assert.deepStrictEqual(Buffer.from(ab, 0, NaN), expected);
assert.deepStrictEqual(Buffer.from(ab, 0, {}), expected);
assert.deepStrictEqual(Buffer.from(ab, 0, []), expected);
// If length can be converted to a number, it will be.
assert.deepStrictEqual(Buffer.from(ab, 0, [1]), Buffer.from(ab, 0, 1));
//If length is Infinity, throw.
common.expectsError(() => {
Buffer.from(ab, 0, Infinity);
}, {
code: 'ERR_BUFFER_OUT_OF_BOUNDS',
type: RangeError,
message: '"length" is outside of buffer bounds'
});
}