21 lines
768 B
JavaScript
21 lines
768 B
JavaScript
const createBuffer = (() => {
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// See https://github.com/whatwg/html/issues/5380 for why not `new SharedArrayBuffer()`
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let sabConstructor;
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try {
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sabConstructor = new WebAssembly.Memory({ shared:true, initial:0, maximum:0 }).buffer.constructor;
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} catch(e) {
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sabConstructor = null;
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}
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return (type, length, opts) => {
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if (type === "ArrayBuffer") {
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return new ArrayBuffer(length, opts);
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} else if (type === "SharedArrayBuffer") {
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if (sabConstructor && sabConstructor.name !== "SharedArrayBuffer") {
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throw new Error("WebAssembly.Memory does not support shared:true");
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}
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return new sabConstructor(length, opts);
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} else {
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throw new Error("type has to be ArrayBuffer or SharedArrayBuffer");
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}
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}
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})();
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