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