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36 lines
1.9 KiB
36 lines
1.9 KiB
2 years ago
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var global = require('../internals/global');
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var uncurryThis = require('../internals/function-uncurry-this');
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var uncurryThisAccessor = require('../internals/function-uncurry-this-accessor');
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var toIndex = require('../internals/to-index');
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var isDetached = require('../internals/array-buffer-is-detached');
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var arrayBufferByteLength = require('../internals/array-buffer-byte-length');
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var PROPER_TRANSFER = require('../internals/structured-clone-proper-transfer');
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var TypeError = global.TypeError;
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var structuredClone = global.structuredClone;
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var ArrayBuffer = global.ArrayBuffer;
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var DataView = global.DataView;
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var min = Math.min;
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var ArrayBufferPrototype = ArrayBuffer.prototype;
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var DataViewPrototype = DataView.prototype;
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var slice = uncurryThis(ArrayBufferPrototype.slice);
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var isResizable = uncurryThisAccessor(ArrayBufferPrototype, 'resizable', 'get');
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var maxByteLength = uncurryThisAccessor(ArrayBufferPrototype, 'maxByteLength', 'get');
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var getInt8 = uncurryThis(DataViewPrototype.getInt8);
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var setInt8 = uncurryThis(DataViewPrototype.setInt8);
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module.exports = PROPER_TRANSFER && function (arrayBuffer, newLength, preserveResizability) {
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var byteLength = arrayBufferByteLength(arrayBuffer);
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var newByteLength = newLength === undefined ? byteLength : min(toIndex(newLength), byteLength);
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var fixedLength = !isResizable || !isResizable(arrayBuffer);
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if (isDetached(arrayBuffer)) throw TypeError('ArrayBuffer is detached');
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var newBuffer = structuredClone(arrayBuffer, { transfer: [arrayBuffer] });
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if (byteLength == newByteLength && (preserveResizability || fixedLength)) return newBuffer;
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if (!preserveResizability || fixedLength) return slice(newBuffer, 0, newByteLength);
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var newNewBuffer = new ArrayBuffer(newByteLength, maxByteLength && { maxByteLength: maxByteLength(newBuffer) });
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var a = new DataView(newBuffer);
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var b = new DataView(newNewBuffer);
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for (var i = 0; i < newByteLength; i++) setInt8(b, i, getInt8(a, i));
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return newNewBuffer;
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};
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