113 lines
2.7 KiB
JavaScript
113 lines
2.7 KiB
JavaScript
'use strict';
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var Buffer = require('../../').Buffer;
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var assert = require('assert');
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var Buffer = require('../../').Buffer;
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var LENGTH = 16;
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var ab = new ArrayBuffer(LENGTH);
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var dv = new DataView(ab);
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var ui = new Uint8Array(ab);
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var buf = Buffer.from(ab);
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assert.ok(buf instanceof Buffer);
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// For backwards compatibility of old .parent property test that if buf is not
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// a slice then .parent should be undefined.
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assert.equal(buf.parent, undefined);
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assert.equal(buf.buffer, ab);
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assert.equal(buf.length, ab.byteLength);
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buf.fill(0xC);
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for (var i = 0; i < LENGTH; i++) {
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assert.equal(ui[i], 0xC);
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ui[i] = 0xF;
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assert.equal(buf[i], 0xF);
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}
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buf.writeUInt32LE(0xF00, 0);
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buf.writeUInt32BE(0xB47, 4);
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buf.writeDoubleLE(3.1415, 8);
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assert.equal(dv.getUint32(0, true), 0xF00);
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assert.equal(dv.getUint32(4), 0xB47);
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assert.equal(dv.getFloat64(8, true), 3.1415);
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// Now test protecting users from doing stupid things
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assert.throws(function() {
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function AB() { }
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Object.setPrototypeOf(AB, ArrayBuffer);
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Object.setPrototypeOf(AB.prototype, ArrayBuffer.prototype);
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Buffer.from(new AB());
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}, TypeError);
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// write{Double,Float}{LE,BE} with noAssert should not crash, cf. #3766
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var b = Buffer.allocUnsafe(1);
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b.writeFloatLE(11.11, 0, true);
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b.writeFloatBE(11.11, 0, true);
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b.writeDoubleLE(11.11, 0, true);
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b.writeDoubleBE(11.11, 0, true);
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// Test the byteOffset and length arguments
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{
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var ab = new Uint8Array(5);
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ab[0] = 1;
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ab[1] = 2;
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ab[2] = 3;
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ab[3] = 4;
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ab[4] = 5;
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var buf = Buffer.from(ab.buffer, 1, 3);
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assert.equal(buf.length, 3);
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assert.equal(buf[0], 2);
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assert.equal(buf[1], 3);
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assert.equal(buf[2], 4);
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buf[0] = 9;
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assert.equal(ab[1], 9);
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assert.throws(() => Buffer.from(ab.buffer, 6), (err) => {
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assert(err instanceof RangeError);
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assert(/'offset' is out of bounds/.test(err.message));
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return true;
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});
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assert.throws(() => Buffer.from(ab.buffer, 3, 6), (err) => {
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assert(err instanceof RangeError);
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assert(/'length' is out of bounds/.test(err.message));
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return true;
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});
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}
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// Test the deprecated Buffer() version also
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{
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var ab = new Uint8Array(5);
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ab[0] = 1;
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ab[1] = 2;
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ab[2] = 3;
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ab[3] = 4;
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ab[4] = 5;
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var buf = Buffer(ab.buffer, 1, 3);
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assert.equal(buf.length, 3);
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assert.equal(buf[0], 2);
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assert.equal(buf[1], 3);
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assert.equal(buf[2], 4);
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buf[0] = 9;
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assert.equal(ab[1], 9);
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assert.throws(() => Buffer(ab.buffer, 6), (err) => {
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assert(err instanceof RangeError);
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assert(/'offset' is out of bounds/.test(err.message));
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return true;
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});
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assert.throws(() => Buffer(ab.buffer, 3, 6), (err) => {
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assert(err instanceof RangeError);
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assert(/'length' is out of bounds/.test(err.message));
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return true;
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});
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}
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