'use strict';

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());

}, {

code: 'ERR_INVALID_ARG_TYPE',

name: 'TypeError',

message: 'The first argument must be of type string or an instance of ' +

'Buffer, ArrayBuffer, or Array or an Array-like Object. Received ' +

'an instance of AB'

});

// 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);

assert.throws(() => Buffer.from(ab.buffer, 6), {

code: 'ERR_BUFFER_OUT_OF_BOUNDS',

name: 'RangeError',

message: '"offset" is outside of buffer bounds'

});

assert.throws(() => Buffer.from(ab.buffer, 3, 6), {

code: 'ERR_BUFFER_OUT_OF_BOUNDS',

name: '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);

assert.throws(() => Buffer(ab.buffer, 6), {

code: 'ERR_BUFFER_OUT_OF_BOUNDS',

name: 'RangeError',

message: '"offset" is outside of buffer bounds'

});

assert.throws(() => Buffer(ab.buffer, 3, 6), {

code: 'ERR_BUFFER_OUT_OF_BOUNDS',

name: '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.

assert.throws(() => {

Buffer.from(ab, Infinity);

}, {

code: 'ERR_BUFFER_OUT_OF_BOUNDS',

name: '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.

assert.throws(() => {

Buffer.from(ab, 0, Infinity);

}, {

code: 'ERR_BUFFER_OUT_OF_BOUNDS',

name: 'RangeError',

message: '"length" is outside of buffer bounds'

});

}

// Test an array like entry with the length set to NaN.

assert.deepStrictEqual(Buffer.from({ length: NaN }), Buffer.alloc(0));