ef6086b97eabbf67069a72067513768c388c17a07abee306bd085efd246754cd3dcf1f07ba9699b56e8a4c89828a644e88d9e19ea375b80fbc45cdd069b31b 5.0 KB

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  1. 'use strict';
  2. var GetIntrinsic = require('get-intrinsic');
  3. var $RangeError = require('es-errors/range');
  4. var $SyntaxError = require('es-errors/syntax');
  5. var $TypeError = require('es-errors/type');
  6. var $ArrayBuffer = GetIntrinsic('%ArrayBuffer%', true);
  7. var typedArrayBuffer = require('typed-array-buffer');
  8. var typedArrayByteLength = require('typed-array-byte-length');
  9. var typedArrayByteOffset = require('typed-array-byte-offset');
  10. var typedArrayLength = require('typed-array-length');
  11. var whichTypedArray = require('which-typed-array');
  12. var isInteger = require('math-intrinsics/isInteger');
  13. var CloneArrayBuffer = require('./CloneArrayBuffer');
  14. var GetValueFromBuffer = require('./GetValueFromBuffer');
  15. var IsDetachedBuffer = require('./IsDetachedBuffer');
  16. var IsSharedArrayBuffer = require('./IsSharedArrayBuffer');
  17. var SameValue = require('./SameValue');
  18. var SetValueInBuffer = require('./SetValueInBuffer');
  19. var tableTAO = require('./tables/typed-array-objects');
  20. // https://262.ecma-international.org/12.0/#sec-settypedarrayfromtypedarray
  21. module.exports = function SetTypedArrayFromTypedArray(target, targetOffset, source) {
  22. var whichTarget = whichTypedArray(target);
  23. if (!whichTarget) {
  24. throw new $TypeError('Assertion failed: target must be a TypedArray instance');
  25. }
  26. if (targetOffset !== Infinity && (!isInteger(targetOffset) || targetOffset < 0)) {
  27. throw new $TypeError('Assertion failed: targetOffset must be a non-negative integer or +Infinity');
  28. }
  29. var whichSource = whichTypedArray(source);
  30. if (!whichSource) {
  31. throw new $TypeError('Assertion failed: source must be a TypedArray instance'); // step 1
  32. }
  33. var targetBuffer = typedArrayBuffer(target); // step 2
  34. if (IsDetachedBuffer(targetBuffer)) {
  35. throw new $TypeError('target’s buffer is detached'); // step 3
  36. }
  37. var targetLength = typedArrayLength(target); // step 4
  38. var srcBuffer = typedArrayBuffer(source); // step 5
  39. if (IsDetachedBuffer(srcBuffer)) {
  40. throw new $TypeError('source’s buffer is detached'); // step 6
  41. }
  42. var targetName = whichTarget; // step 7
  43. var targetType = tableTAO.name['$' + targetName]; // step 8
  44. var targetElementSize = tableTAO.size['$' + targetType]; // step 9
  45. var targetByteOffset = typedArrayByteOffset(target); // step 10
  46. var srcName = whichSource; // step 11
  47. var srcType = tableTAO.name['$' + srcName]; // step 12
  48. var srcElementSize = tableTAO.size['$' + srcName]; // step 13
  49. var srcLength = typedArrayLength(source); // step 14
  50. var srcByteOffset = typedArrayByteOffset(source); // step 15
  51. if (targetOffset === Infinity) {
  52. throw new $RangeError('targetOffset must be a non-negative integer or +Infinity'); // step 16
  53. }
  54. if (srcLength + targetOffset > targetLength) {
  55. throw new $RangeError('targetOffset + source.length must not be greater than target.length'); // step 17
  56. }
  57. var targetContentType = whichTarget === 'BigInt64Array' || whichTarget === 'BigUint64Array' ? 'BigInt' : 'Number';
  58. var sourceContentType = whichSource === 'BigInt64Array' || whichSource === 'BigUint64Array' ? 'BigInt' : 'Number';
  59. if (targetContentType !== sourceContentType) {
  60. throw new $TypeError('source and target must have the same content type'); // step 18
  61. }
  62. var same;
  63. if (IsSharedArrayBuffer(srcBuffer) && IsSharedArrayBuffer(targetBuffer)) { // step 19
  64. // a. If srcBuffer.[[ArrayBufferData]] and targetBuffer.[[ArrayBufferData]] are the same Shared Data Block values, let same be true; else let same be false.
  65. throw new $SyntaxError('SharedArrayBuffer is not supported by this implementation');
  66. } else {
  67. same = SameValue(srcBuffer, targetBuffer); // step 20
  68. }
  69. var srcByteIndex;
  70. if (same) { // step 21
  71. var srcByteLength = typedArrayByteLength(source); // step 21.a
  72. srcBuffer = CloneArrayBuffer(srcBuffer, srcByteOffset, srcByteLength, $ArrayBuffer); // step 21.b
  73. // c. NOTE: %ArrayBuffer% is used to clone srcBuffer because is it known to not have any observable side-effects.
  74. srcByteIndex = 0; // step 21.d
  75. } else {
  76. srcByteIndex = srcByteOffset; // step 22
  77. }
  78. var targetByteIndex = (targetOffset * targetElementSize) + targetByteOffset; // step 23
  79. var limit = targetByteIndex + (targetElementSize * srcLength); // step 24
  80. var value;
  81. if (srcType === targetType) { // step 25
  82. // 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.
  83. while (targetByteIndex < limit) { // step 25.b
  84. value = GetValueFromBuffer(srcBuffer, srcByteIndex, 'Uint8', true, 'Unordered'); // step 25.b.i
  85. SetValueInBuffer(targetBuffer, targetByteIndex, 'Uint8', value, true, 'Unordered'); // step 25.b.ii
  86. srcByteIndex += 1; // step 25.b.iii
  87. targetByteIndex += 1; // step 25.b.iv
  88. }
  89. } else { // step 26
  90. while (targetByteIndex < limit) { // step 26.a
  91. value = GetValueFromBuffer(srcBuffer, srcByteIndex, srcType, true, 'Unordered'); // step 26.a.i
  92. SetValueInBuffer(targetBuffer, targetByteIndex, targetType, value, true, 'Unordered'); // step 26.a.ii
  93. srcByteIndex += srcElementSize; // step 26.a.iii
  94. targetByteIndex += targetElementSize; // step 26.a.iv
  95. }
  96. }
  97. };