tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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defined-byteoffset-undefined-bytelength-sab.js (2406B)

      1 // |reftest| skip-if(!this.hasOwnProperty('SharedArrayBuffer')) -- SharedArrayBuffer is not enabled unconditionally
      2 // Copyright (C) 2016 the V8 project authors. All rights reserved.
      3 // Copyright (C) 2017 Mozilla Corporation. All rights reserved.
      4 // This code is governed by the BSD license found in the LICENSE file.
      5 
      6 /*---
      7 esid: sec-dataview-buffer-byteoffset-bytelength
      8 description: >
      9  Return new instance from defined byteoffset and undefined bytelength
     10 info: |
     11  24.2.2.1 DataView (buffer, byteOffset, byteLength )
     12 
     13  ...
     14  8. If byteLength is either not present or undefined, then
     15    a. Let viewByteLength be bufferByteLength - offset.
     16  ...
     17  17. Return O.
     18 features: [SharedArrayBuffer]
     19 ---*/
     20 
     21 var sample;
     22 var buffer = new SharedArrayBuffer(4);
     23 
     24 sample = new DataView(buffer, 0, undefined);
     25 assert.sameValue(sample.byteLength, 4, "sample.byteLength");
     26 assert.sameValue(sample.byteOffset, 0, "sample.byteOffset");
     27 assert.sameValue(sample.buffer, buffer);
     28 assert.sameValue(sample.constructor, DataView);
     29 assert.sameValue(Object.getPrototypeOf(sample), DataView.prototype);
     30 
     31 sample = new DataView(buffer, 1, undefined);
     32 assert.sameValue(sample.byteLength, 3, "sample.byteLength");
     33 assert.sameValue(sample.byteOffset, 1, "sample.byteOffset");
     34 assert.sameValue(sample.buffer, buffer);
     35 assert.sameValue(sample.constructor, DataView);
     36 assert.sameValue(Object.getPrototypeOf(sample), DataView.prototype);
     37 
     38 sample = new DataView(buffer, 2, undefined);
     39 assert.sameValue(sample.byteLength, 2, "sample.byteLength");
     40 assert.sameValue(sample.byteOffset, 2, "sample.byteOffset");
     41 assert.sameValue(sample.buffer, buffer);
     42 assert.sameValue(sample.constructor, DataView);
     43 assert.sameValue(Object.getPrototypeOf(sample), DataView.prototype);
     44 
     45 sample = new DataView(buffer, 3, undefined);
     46 assert.sameValue(sample.byteLength, 1, "sample.byteLength");
     47 assert.sameValue(sample.byteOffset, 3, "sample.byteOffset");
     48 assert.sameValue(sample.buffer, buffer);
     49 assert.sameValue(sample.constructor, DataView);
     50 assert.sameValue(Object.getPrototypeOf(sample), DataView.prototype);
     51 
     52 sample = new DataView(buffer, 4, undefined);
     53 assert.sameValue(sample.byteLength, 0, "sample.byteLength");
     54 assert.sameValue(sample.byteOffset, 4, "sample.byteOffset");
     55 assert.sameValue(sample.buffer, buffer);
     56 assert.sameValue(sample.constructor, DataView);
     57 assert.sameValue(Object.getPrototypeOf(sample), DataView.prototype);
     58 
     59 reportCompare(0, 0);