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- 'use strict';
- var GetIntrinsic = require('get-intrinsic');
- var $RangeError = require('es-errors/range');
- var $SyntaxError = require('es-errors/syntax');
- var $TypeError = require('es-errors/type');
- var $ArrayBuffer = GetIntrinsic('%ArrayBuffer%', true);
- var typedArrayBuffer = require('typed-array-buffer');
- var typedArrayByteLength = require('typed-array-byte-length');
- var typedArrayByteOffset = require('typed-array-byte-offset');
- var typedArrayLength = require('typed-array-length');
- var whichTypedArray = require('which-typed-array');
- var isInteger = require('math-intrinsics/isInteger');
- var CloneArrayBuffer = require('./CloneArrayBuffer');
- var GetValueFromBuffer = require('./GetValueFromBuffer');
- var IsDetachedBuffer = require('./IsDetachedBuffer');
- var IsSharedArrayBuffer = require('./IsSharedArrayBuffer');
- var SameValue = require('./SameValue');
- var SetValueInBuffer = require('./SetValueInBuffer');
- var tableTAO = require('./tables/typed-array-objects');
- // https://262.ecma-international.org/12.0/#sec-settypedarrayfromtypedarray
- module.exports = function SetTypedArrayFromTypedArray(target, targetOffset, source) {
- var whichTarget = whichTypedArray(target);
- if (!whichTarget) {
- throw new $TypeError('Assertion failed: target must be a TypedArray instance');
- }
- if (targetOffset !== Infinity && (!isInteger(targetOffset) || targetOffset < 0)) {
- throw new $TypeError('Assertion failed: targetOffset must be a non-negative integer or +Infinity');
- }
- var whichSource = whichTypedArray(source);
- if (!whichSource) {
- throw new $TypeError('Assertion failed: source must be a TypedArray instance'); // step 1
- }
- var targetBuffer = typedArrayBuffer(target); // step 2
- if (IsDetachedBuffer(targetBuffer)) {
- throw new $TypeError('target’s buffer is detached'); // step 3
- }
- var targetLength = typedArrayLength(target); // step 4
- var srcBuffer = typedArrayBuffer(source); // step 5
- if (IsDetachedBuffer(srcBuffer)) {
- throw new $TypeError('source’s buffer is detached'); // step 6
- }
- var targetName = whichTarget; // step 7
- var targetType = tableTAO.name['$' + targetName]; // step 8
- var targetElementSize = tableTAO.size['$' + targetType]; // step 9
- var targetByteOffset = typedArrayByteOffset(target); // step 10
- var srcName = whichSource; // step 11
- var srcType = tableTAO.name['$' + srcName]; // step 12
- var srcElementSize = tableTAO.size['$' + srcName]; // step 13
- var srcLength = typedArrayLength(source); // step 14
- var srcByteOffset = typedArrayByteOffset(source); // step 15
- if (targetOffset === Infinity) {
- throw new $RangeError('targetOffset must be a non-negative integer or +Infinity'); // step 16
- }
- if (srcLength + targetOffset > targetLength) {
- throw new $RangeError('targetOffset + source.length must not be greater than target.length'); // step 17
- }
- var targetContentType = whichTarget === 'BigInt64Array' || whichTarget === 'BigUint64Array' ? 'BigInt' : 'Number';
- var sourceContentType = whichSource === 'BigInt64Array' || whichSource === 'BigUint64Array' ? 'BigInt' : 'Number';
- if (targetContentType !== sourceContentType) {
- throw new $TypeError('source and target must have the same content type'); // step 18
- }
- var same;
- if (IsSharedArrayBuffer(srcBuffer) && IsSharedArrayBuffer(targetBuffer)) { // step 19
- // a. If srcBuffer.[[ArrayBufferData]] and targetBuffer.[[ArrayBufferData]] are the same Shared Data Block values, let same be true; else let same be false.
- throw new $SyntaxError('SharedArrayBuffer is not supported by this implementation');
- } else {
- same = SameValue(srcBuffer, targetBuffer); // step 20
- }
- var srcByteIndex;
- if (same) { // step 21
- var srcByteLength = typedArrayByteLength(source); // step 21.a
- srcBuffer = CloneArrayBuffer(srcBuffer, srcByteOffset, srcByteLength, $ArrayBuffer); // step 21.b
- // c. NOTE: %ArrayBuffer% is used to clone srcBuffer because is it known to not have any observable side-effects.
- srcByteIndex = 0; // step 21.d
- } else {
- srcByteIndex = srcByteOffset; // step 22
- }
- var targetByteIndex = (targetOffset * targetElementSize) + targetByteOffset; // step 23
- var limit = targetByteIndex + (targetElementSize * srcLength); // step 24
- var value;
- if (srcType === targetType) { // step 25
- // a. NOTE: If srcType and targetType are the same, the transfer must be performed in a manner that preserves the bit-level encoding of the source data.
- while (targetByteIndex < limit) { // step 25.b
- value = GetValueFromBuffer(srcBuffer, srcByteIndex, 'Uint8', true, 'Unordered'); // step 25.b.i
- SetValueInBuffer(targetBuffer, targetByteIndex, 'Uint8', value, true, 'Unordered'); // step 25.b.ii
- srcByteIndex += 1; // step 25.b.iii
- targetByteIndex += 1; // step 25.b.iv
- }
- } else { // step 26
- while (targetByteIndex < limit) { // step 26.a
- value = GetValueFromBuffer(srcBuffer, srcByteIndex, srcType, true, 'Unordered'); // step 26.a.i
- SetValueInBuffer(targetBuffer, targetByteIndex, targetType, value, true, 'Unordered'); // step 26.a.ii
- srcByteIndex += srcElementSize; // step 26.a.iii
- targetByteIndex += targetElementSize; // step 26.a.iv
- }
- }
- };
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