Function toArrayBuffer

lib/internal/streams/iter/consumers.js:163–181

* Convert a Uint8Array to its backing ArrayBuffer, slicing if necessary. * Handles both ArrayBuffer and SharedArrayBuffer backing stores. * @param {Uint8Array} data * @returns {ArrayBuffer|SharedArrayBuffer}

(data)

 * @returns {ArrayBuffer|SharedArrayBuffer}
 */
function toArrayBuffer(data) {
  const byteOffset = TypedArrayPrototypeGetByteOffset(data);
  const byteLength = TypedArrayPrototypeGetByteLength(data);
  const buffer = TypedArrayPrototypeGetBuffer(data);
  // SharedArrayBuffer is not available in primordials, so use
  // direct property access for its byteLength and slice.
  if (isSharedArrayBuffer(buffer)) {
    if (byteOffset === 0 && byteLength === buffer.byteLength) {
      return buffer;
    }
    return buffer.slice(byteOffset, byteOffset + byteLength);
  }
  if (byteOffset === 0 &&
      byteLength === ArrayBufferPrototypeGetByteLength(buffer)) {
    return buffer;
  }
  return ArrayBufferPrototypeSlice(buffer, byteOffset,
                                   byteOffset + byteLength);
}

// =============================================================================
// Shared option validation