575695cdbcf758fff9e19c39c5bf113e7ad74d5208db02ec7301cdda686ab203b659d05d6ef04bfc96ebfbf175b4295ae90031cf161c1794489029a8bfb3fc 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 TypedArrayElementSize = require('./TypedArrayElementSize');
  20. var TypedArrayElementType = require('./TypedArrayElementType');
  21. // https://262.ecma-international.org/13.0/#sec-settypedarrayfromtypedarray
  22. module.exports = function SetTypedArrayFromTypedArray(target, targetOffset, source) {
  23. var whichTarget = whichTypedArray(target);
  24. if (!whichTarget) {
  25. throw new $TypeError('Assertion failed: target must be a TypedArray instance');
  26. }
  27. if (targetOffset !== Infinity && (!isInteger(targetOffset) || targetOffset < 0)) {
  28. throw new $TypeError('Assertion failed: targetOffset must be a non-negative integer or +Infinity');
  29. }
  30. var whichSource = whichTypedArray(source);
  31. if (!whichSource) {
  32. throw new $TypeError('Assertion failed: source must be a TypedArray instance');
  33. }
  34. var targetBuffer = typedArrayBuffer(target); // step 1
  35. if (IsDetachedBuffer(targetBuffer)) {
  36. throw new $TypeError('target’s buffer is detached'); // step 2
  37. }
  38. var targetLength = typedArrayLength(target); // step 3
  39. var srcBuffer = typedArrayBuffer(source); // step 4
  40. if (IsDetachedBuffer(srcBuffer)) {
  41. throw new $TypeError('source’s buffer is detached'); // step 5
  42. }
  43. var targetType = TypedArrayElementType(target); // step 6
  44. var targetElementSize = TypedArrayElementSize(target); // step 7
  45. var targetByteOffset = typedArrayByteOffset(target); // step 8
  46. var srcType = TypedArrayElementType(source); // step 9
  47. var srcElementSize = TypedArrayElementSize(source); // step 10
  48. var srcLength = typedArrayLength(source); // step 11
  49. var srcByteOffset = typedArrayByteOffset(source); // step 12
  50. if (targetOffset === Infinity) {
  51. throw new $RangeError('targetOffset must be a non-negative integer or +Infinity'); // step 13
  52. }
  53. if (srcLength + targetOffset > targetLength) {
  54. throw new $RangeError('targetOffset + source.length must not be greater than target.length'); // step 14
  55. }
  56. var targetContentType = whichTarget === 'BigInt64Array' || whichTarget === 'BigUint64Array' ? 'BigInt' : 'Number';
  57. var sourceContentType = whichSource === 'BigInt64Array' || whichSource === 'BigUint64Array' ? 'BigInt' : 'Number';
  58. if (targetContentType !== sourceContentType) {
  59. throw new $TypeError('source and target must have the same content type'); // step 15
  60. }
  61. var same;
  62. if (IsSharedArrayBuffer(srcBuffer) && IsSharedArrayBuffer(targetBuffer)) { // step 16
  63. // a. If srcBuffer.[[ArrayBufferData]] and targetBuffer.[[ArrayBufferData]] are the same Shared Data Block values, let same be true; else let same be false.
  64. throw new $SyntaxError('SharedArrayBuffer is not supported by this implementation');
  65. } else {
  66. same = SameValue(srcBuffer, targetBuffer); // step 17
  67. }
  68. var srcByteIndex;
  69. if (same) { // step 18
  70. var srcByteLength = typedArrayByteLength(source); // step 18.a
  71. srcBuffer = CloneArrayBuffer(srcBuffer, srcByteOffset, srcByteLength, $ArrayBuffer); // step 18.b
  72. // c. NOTE: %ArrayBuffer% is used to clone srcBuffer because is it known to not have any observable side-effects.
  73. srcByteIndex = 0; // step 18.d
  74. } else {
  75. srcByteIndex = srcByteOffset; // step 19
  76. }
  77. var targetByteIndex = (targetOffset * targetElementSize) + targetByteOffset; // step 20
  78. var limit = targetByteIndex + (targetElementSize * srcLength); // step 21
  79. var value;
  80. if (srcType === targetType) { // step 22
  81. // 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.
  82. while (targetByteIndex < limit) { // step 22.b
  83. value = GetValueFromBuffer(srcBuffer, srcByteIndex, 'Uint8', true, 'Unordered'); // step 22.b.i
  84. SetValueInBuffer(targetBuffer, targetByteIndex, 'Uint8', value, true, 'Unordered'); // step 22.b.ii
  85. srcByteIndex += 1; // step 22.b.iii
  86. targetByteIndex += 1; // step 22.b.iv
  87. }
  88. } else { // step 23
  89. while (targetByteIndex < limit) { // step 23.a
  90. value = GetValueFromBuffer(srcBuffer, srcByteIndex, srcType, true, 'Unordered'); // step 23.a.i
  91. SetValueInBuffer(targetBuffer, targetByteIndex, targetType, value, true, 'Unordered'); // step 23.a.ii
  92. srcByteIndex += srcElementSize; // step 23.a.iii
  93. targetByteIndex += targetElementSize; // step 23.a.iv
  94. }
  95. }
  96. };