| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657 |
- 'use strict';
- var $TypeError = require('es-errors/type');
- var IsDetachedBuffer = require('./IsDetachedBuffer');
- var IsFixedLengthArrayBuffer = require('./IsFixedLengthArrayBuffer');
- var TypedArrayElementSize = require('./TypedArrayElementSize');
- var isTypedArrayWithBufferWitnessRecord = require('../helpers/records/typed-array-with-buffer-witness-record');
- var typedArrayBuffer = require('typed-array-buffer');
- var typedArrayByteOffset = require('typed-array-byte-offset');
- var typedArrayLength = require('typed-array-length');
- // https://262.ecma-international.org/15.0/#sec-istypedarrayoutofbounds
- module.exports = function IsTypedArrayOutOfBounds(taRecord) {
- if (!isTypedArrayWithBufferWitnessRecord(taRecord)) {
- throw new $TypeError('Assertion failed: `taRecord` must be a TypedArray With Buffer Witness Record');
- }
- var O = taRecord['[[Object]]']; // step 1
- var bufferByteLength = taRecord['[[CachedBufferByteLength]]']; // step 2
- if (IsDetachedBuffer(typedArrayBuffer(O)) && bufferByteLength !== 'DETACHED') {
- throw new $TypeError('Assertion failed: typed array is detached only if the byte length is ~DETACHED~'); // step 3
- }
- if (bufferByteLength === 'DETACHED') {
- return true; // step 4
- }
- var byteOffsetStart = typedArrayByteOffset(O); // step 5
- var isFixed = IsFixedLengthArrayBuffer(typedArrayBuffer(O));
- var byteOffsetEnd;
- var length = isFixed ? typedArrayLength(O) : 'AUTO';
- // TODO: probably use package for array length
- // seems to apply when TA is backed by a resizable/growable AB
- if (length === 'AUTO') { // step 6
- byteOffsetEnd = bufferByteLength; // step 6.a
- } else {
- var elementSize = TypedArrayElementSize(O); // step 7.a
- byteOffsetEnd = byteOffsetStart + (length * elementSize); // step 7.b
- }
- if (byteOffsetStart > bufferByteLength || byteOffsetEnd > bufferByteLength) {
- return true; // step 8
- }
- // 9. NOTE: 0-length TypedArrays are not considered out-of-bounds.
- return false; // step 10
- };
|