46 lines
2.3 KiB
JavaScript
46 lines
2.3 KiB
JavaScript
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'use strict';
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var globalThis = require('../internals/global-this');
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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 notDetached = require('../internals/array-buffer-not-detached');
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var arrayBufferByteLength = require('../internals/array-buffer-byte-length');
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var detachTransferable = require('../internals/detach-transferable');
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var PROPER_STRUCTURED_CLONE_TRANSFER = require('../internals/structured-clone-proper-transfer');
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var structuredClone = globalThis.structuredClone;
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var ArrayBuffer = globalThis.ArrayBuffer;
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var DataView = globalThis.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_STRUCTURED_CLONE_TRANSFER || detachTransferable) && function (arrayBuffer, newLength, preserveResizability) {
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var byteLength = arrayBufferByteLength(arrayBuffer);
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var newByteLength = newLength === undefined ? byteLength : toIndex(newLength);
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var fixedLength = !isResizable || !isResizable(arrayBuffer);
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var newBuffer;
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notDetached(arrayBuffer);
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if (PROPER_STRUCTURED_CLONE_TRANSFER) {
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arrayBuffer = structuredClone(arrayBuffer, { transfer: [arrayBuffer] });
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if (byteLength === newByteLength && (preserveResizability || fixedLength)) return arrayBuffer;
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}
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if (byteLength >= newByteLength && (!preserveResizability || fixedLength)) {
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newBuffer = slice(arrayBuffer, 0, newByteLength);
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} else {
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var options = preserveResizability && !fixedLength && maxByteLength ? { maxByteLength: maxByteLength(arrayBuffer) } : undefined;
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newBuffer = new ArrayBuffer(newByteLength, options);
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var a = new DataView(arrayBuffer);
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var b = new DataView(newBuffer);
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var copyLength = min(newByteLength, byteLength);
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for (var i = 0; i < copyLength; i++) setInt8(b, i, getInt8(a, i));
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}
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if (!PROPER_STRUCTURED_CLONE_TRANSFER) detachTransferable(arrayBuffer);
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return newBuffer;
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};
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