TanTan
e311ca3275
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44 lines
1.3 KiB
Plaintext
44 lines
1.3 KiB
Plaintext
'use strict';
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var $TypeError = require('es-errors/type');
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var IsFixedLengthArrayBuffer = require('./IsFixedLengthArrayBuffer');
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var IsTypedArrayOutOfBounds = require('./IsTypedArrayOutOfBounds');
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var TypedArrayElementSize = require('./TypedArrayElementSize');
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var TypedArrayLength = require('./TypedArrayLength');
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var isTypedArrayWithBufferWitnessRecord = require('../helpers/records/typed-array-with-buffer-witness-record');
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var typedArrayByffer = require('typed-array-buffer');
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var typedArrayByteLength = require('typed-array-byte-length');
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// https://262.ecma-international.org/15.0/#sec-typedarraybytelength
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module.exports = function TypedArrayByteLength(taRecord) {
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if (!isTypedArrayWithBufferWitnessRecord(taRecord)) {
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throw new $TypeError('Assertion failed: `taRecord` must be a TypedArray With Buffer Witness Record');
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}
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if (IsTypedArrayOutOfBounds(taRecord)) {
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return 0; // step 1
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}
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var length = TypedArrayLength(taRecord); // step 2
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if (length === 0) {
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return 0; // step 3
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}
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var O = taRecord['[[Object]]']; // step 4
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var isFixed = IsFixedLengthArrayBuffer(typedArrayByffer(O));
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var byteLength = isFixed ? typedArrayByteLength(O) : 'AUTO';
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if (byteLength !== 'AUTO') {
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return byteLength; // step 5
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}
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var elementSize = TypedArrayElementSize(O); // step 6
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return length * elementSize; // step 7
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};
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