ef18174df4073e4a26986b8bdd0035b0b282039439265ed2af90db9b4d63e07ceeffe30196da36fdbc0de43ed1201687425ff531e3990ab167df6e3890b4dc 5.1 KB

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  1. 'use strict';
  2. var $RangeError = require('es-errors/range');
  3. var $SyntaxError = require('es-errors/syntax');
  4. var $TypeError = require('es-errors/type');
  5. var CloneArrayBuffer = require('./CloneArrayBuffer');
  6. var GetValueFromBuffer = require('./GetValueFromBuffer');
  7. var IsSharedArrayBuffer = require('./IsSharedArrayBuffer');
  8. var IsTypedArrayOutOfBounds = require('./IsTypedArrayOutOfBounds');
  9. var MakeTypedArrayWithBufferWitnessRecord = require('./MakeTypedArrayWithBufferWitnessRecord');
  10. var SameValue = require('./SameValue');
  11. var SetValueInBuffer = require('./SetValueInBuffer');
  12. var TypedArrayByteLength = require('./TypedArrayByteLength');
  13. var TypedArrayElementSize = require('./TypedArrayElementSize');
  14. var TypedArrayElementType = require('./TypedArrayElementType');
  15. var TypedArrayLength = require('./TypedArrayLength');
  16. var typedArrayBuffer = require('typed-array-buffer');
  17. var typedArrayByteOffset = require('typed-array-byte-offset');
  18. var whichTypedArray = require('which-typed-array');
  19. var callBound = require('call-bound');
  20. var isInteger = require('math-intrinsics/isInteger');
  21. var $ArrayBuffer = callBound('ArrayBuffer', true);
  22. // https://262.ecma-international.org/15.0/#sec-settypedarrayfromtypedarray
  23. module.exports = function SetTypedArrayFromTypedArray(target, targetOffset, source) {
  24. var whichTarget = whichTypedArray(target);
  25. if (!whichTarget) {
  26. throw new $TypeError('Assertion failed: `target` must be a Typed Array');
  27. }
  28. if (targetOffset !== Infinity && (!isInteger(targetOffset) || targetOffset < 0)) {
  29. throw new $TypeError('Assertion failed: `targetOffset` must be a non-negative integer or +Infinity');
  30. }
  31. var whichSource = whichTypedArray(source);
  32. if (!whichSource) {
  33. throw new $TypeError('Assertion failed: `source` must be a Typed Array');
  34. }
  35. var targetBuffer = typedArrayBuffer(target); // step 1
  36. var targetRecord = MakeTypedArrayWithBufferWitnessRecord(target, 'SEQ-CST'); // step 2
  37. if (IsTypedArrayOutOfBounds(targetRecord)) {
  38. throw new $TypeError('target is out of bounds'); // step 3
  39. }
  40. var targetLength = TypedArrayLength(targetRecord); // step 4
  41. var srcBuffer = typedArrayBuffer(source); // step 5
  42. var srcRecord = MakeTypedArrayWithBufferWitnessRecord(source, 'SEQ-CST'); // step 6
  43. if (IsTypedArrayOutOfBounds(srcRecord)) {
  44. throw new $TypeError('target is out of bounds'); // step 7
  45. }
  46. var srcLength = TypedArrayLength(srcRecord); // step 8
  47. var targetType = TypedArrayElementType(target); // step 9
  48. var targetElementSize = TypedArrayElementSize(target); // step 10
  49. var targetByteOffset = typedArrayByteOffset(target); // step 11
  50. var srcType = TypedArrayElementType(source); // step 12
  51. var srcElementSize = TypedArrayElementSize(source); // step 13
  52. var srcByteOffset = typedArrayByteOffset(source); // step 14
  53. if (targetOffset === Infinity) {
  54. throw new $RangeError('targetOffset must be a non-negative integer or +Infinity'); // step 15
  55. }
  56. if (srcLength + targetOffset > targetLength) {
  57. throw new $RangeError('targetOffset + source.length must not be greater than target.length'); // step 16
  58. }
  59. var targetContentType = whichTarget === 'BigInt64Array' || whichTarget === 'BigUint64Array' ? 'BIGINT' : 'NUMBER';
  60. var sourceContentType = whichSource === 'BigInt64Array' || whichSource === 'BigUint64Array' ? 'BIGINT' : 'NUMBER';
  61. if (targetContentType !== sourceContentType) {
  62. throw new $TypeError('source and target must have the same content type'); // step 17
  63. }
  64. var sameSharedArrayBuffer = false;
  65. if (IsSharedArrayBuffer(srcBuffer) && IsSharedArrayBuffer(targetBuffer)) { // step 18
  66. // a. If srcBuffer.[[ArrayBufferData]] and targetBuffer.[[ArrayBufferData]] are the same Shared Data Block values, let same be true; else let same be false.
  67. throw new $SyntaxError('SharedArrayBuffer is not supported by this implementation');
  68. }
  69. var srcByteIndex;
  70. if (SameValue(srcBuffer, targetBuffer) || sameSharedArrayBuffer) { // step 19
  71. var srcByteLength = TypedArrayByteLength(srcRecord); // step 19.a
  72. srcBuffer = CloneArrayBuffer(srcBuffer, srcByteOffset, srcByteLength, $ArrayBuffer); // step 19.b
  73. srcByteIndex = 0; // step 19.c
  74. } else { // step 20
  75. srcByteIndex = srcByteOffset; // step 20.a
  76. }
  77. var targetByteIndex = (targetOffset * targetElementSize) + targetByteOffset; // step 21
  78. var limit = targetByteIndex + (targetElementSize * srcLength); // step 22
  79. var value;
  80. if (srcType === targetType) { // step 23
  81. // a. NOTE: The transfer must be performed in a manner that preserves the bit-level encoding of the source data.
  82. while (targetByteIndex < limit) { // step 23.b
  83. value = GetValueFromBuffer(srcBuffer, srcByteIndex, 'UINT8', true, 'UNORDERED'); // step 23.b.i
  84. SetValueInBuffer(targetBuffer, targetByteIndex, 'UINT8', value, true, 'UNORDERED'); // step 23.b.ii
  85. srcByteIndex += 1; // step 23.b.iii
  86. targetByteIndex += 1; // step 23.b.iv
  87. }
  88. } else { // step 24
  89. while (targetByteIndex < limit) { // step 24.a
  90. value = GetValueFromBuffer(srcBuffer, srcByteIndex, srcType, true, 'UNORDERED'); // step 24.a.i
  91. SetValueInBuffer(targetBuffer, targetByteIndex, targetType, value, true, 'UNORDERED'); // step 24.a.ii
  92. srcByteIndex += srcElementSize; // step 24.a.iii
  93. targetByteIndex += targetElementSize; // step 24.a.iv
  94. }
  95. }
  96. };