95 lines
3.6 KiB
JavaScript
95 lines
3.6 KiB
JavaScript
'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var $SyntaxError = require('es-errors/syntax');
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var $TypeError = require('es-errors/type');
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var $Uint8Array = GetIntrinsic('%Uint8Array%', true);
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var isInteger = require('math-intrinsics/isInteger');
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var IsDetachedBuffer = require('./IsDetachedBuffer');
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var NumberToRawBytes = require('./NumberToRawBytes');
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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 hasOwn = require('hasown');
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var tableTAO = require('./tables/typed-array-objects');
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var defaultEndianness = require('../helpers/defaultEndianness');
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var forEach = require('../helpers/forEach');
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// https://262.ecma-international.org/8.0/#sec-setvalueinbuffer
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/* eslint max-params: 0 */
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module.exports = function SetValueInBuffer(arrayBuffer, byteIndex, type, value, isTypedArray, 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 (!isInteger(byteIndex)) {
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throw new $TypeError('Assertion failed: `byteIndex` must be an integer');
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}
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if (typeof type !== 'string' || !hasOwn(tableTAO.size, '$' + type)) {
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throw new $TypeError('Assertion failed: `type` must be a Typed Array Element Type');
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}
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if (typeof value !== 'number') {
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throw new $TypeError('Assertion failed: `value` must be a number');
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}
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if (typeof isTypedArray !== 'boolean') {
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throw new $TypeError('Assertion failed: `isTypedArray` must be a boolean');
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}
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if (order !== 'SeqCst' && order !== 'Unordered' && order !== 'Init') {
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throw new $TypeError('Assertion failed: `order` must be `"SeqCst"`, `"Unordered"`, or `"Init"`');
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}
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if (arguments.length > 6 && typeof arguments[6] !== 'boolean') {
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throw new $TypeError('Assertion failed: `isLittleEndian` must be a boolean, if present');
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}
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if (IsDetachedBuffer(arrayBuffer)) {
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throw new $TypeError('Assertion failed: ArrayBuffer is detached'); // step 1
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}
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// 2. Assert: There are sufficient bytes in arrayBuffer starting at byteIndex to represent a value of type.
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if (byteIndex < 0) {
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throw new $TypeError('Assertion failed: `byteIndex` must be non-negative'); // step 3
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}
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// 4. Assert: Type(value) is Number.
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// 5. Let block be arrayBuffer.[[ArrayBufferData]].
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var elementSize = tableTAO.size['$' + type]; // step 6
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// 7. If isLittleEndian is not present, set isLittleEndian to to the value of the [[LittleEndian]] field of the surrounding agent's Agent Record.
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var isLittleEndian = arguments.length > 6 ? arguments[6] : defaultEndianness === 'little'; // step 8
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var rawBytes = NumberToRawBytes(type, value, isLittleEndian); // step 8
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if (isSAB) { // step 9
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/*
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Let execution be the [[CandidateExecution]] field of the surrounding agent's Agent Record.
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Let eventList be the [[EventList]] field of the element in execution.[[EventsRecords]] whose [[AgentSignifier]] is AgentSignifier().
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If isTypedArray is true and IsNoTearConfiguration(type, order) is true, let noTear be true; otherwise let noTear be false.
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Append WriteSharedMemory { [[Order]]: order, [[NoTear]]: noTear, [[Block]]: block, [[ByteIndex]]: byteIndex, [[ElementSize]]: elementSize, [[Payload]]: rawBytes } to eventList.
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*/
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throw new $SyntaxError('SharedArrayBuffer is not supported by this implementation');
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} else {
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// 10. Store the individual bytes of rawBytes into block, in order, starting at block[byteIndex].
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var arr = new $Uint8Array(arrayBuffer, byteIndex, elementSize);
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forEach(rawBytes, function (rawByte, i) {
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arr[i] = rawByte;
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});
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}
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// 11. Return NormalCompletion(undefined).
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};
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