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41 lines
1.7 KiB
41 lines
1.7 KiB
'use strict'; |
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var $TypeError = require('es-errors/type'); |
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// https://262.ecma-international.org/15.0/#sec-arraybufferbytelength |
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var IsDetachedBuffer = require('./IsDetachedBuffer'); |
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var isArrayBuffer = require('is-array-buffer'); |
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var isSharedArrayBuffer = require('is-shared-array-buffer'); |
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var arrayBufferByteLength = require('array-buffer-byte-length'); |
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var callBound = require('call-bound'); |
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var $sabByteLength = callBound('SharedArrayBuffer.prototype.byteLength', true); |
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var isGrowable = false; // TODO: support this |
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module.exports = function ArrayBufferByteLength(arrayBuffer, order) { |
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var isSAB = isSharedArrayBuffer(arrayBuffer); |
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if (!isArrayBuffer(arrayBuffer) && !isSAB) { |
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throw new $TypeError('Assertion failed: `arrayBuffer` must be an ArrayBuffer or a SharedArrayBuffer'); |
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} |
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if (order !== 'SEQ-CST' && order !== 'UNORDERED') { |
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throw new $TypeError('Assertion failed: `order` must be ~SEQ-CST~ or ~UNORDERED~'); |
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} |
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// 1. If IsSharedArrayBuffer(arrayBuffer) is true and arrayBuffer has an [[ArrayBufferByteLengthData]] internal slot, then |
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// TODO: see if IsFixedLengthArrayBuffer can be used here in the spec instead |
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if (isSAB && isGrowable) { // step 1 |
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// a. Let bufferByteLengthBlock be arrayBuffer.[[ArrayBufferByteLengthData]]. |
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// b. Let rawLength be GetRawBytesFromSharedBlock(bufferByteLengthBlock, 0, BIGUINT64, true, order). |
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// c. Let isLittleEndian be the value of the [[LittleEndian]] field of the surrounding agent's Agent Record. |
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// d. Return ℝ(RawBytesToNumeric(BIGUINT64, rawLength, isLittleEndian)). |
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} |
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if (IsDetachedBuffer(arrayBuffer)) { |
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throw new $TypeError('Assertion failed: `arrayBuffer` must not be detached'); // step 2 |
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} |
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return isSAB ? $sabByteLength(arrayBuffer) : arrayBufferByteLength(arrayBuffer); |
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};
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