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aztack/arraybuffer-maybe-json.ts

Created July 20, 2023 02:46
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ArrayBuffer maybe JSON
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arraybuffer-maybe-json.ts
function maybeJson(arrayBuffer: ArrayBuffer) {
const firstDelimiter = '{'.charCodeAt(0);
const lastDelimiters = ['}\n'.charCodeAt(0), '}\n'.charCodeAt(1), '}\r\n'.charCodeAt(0), '}\r\n'.charCodeAt(1)];
const uint8View = new Uint8Array(arrayBuffer);
const firstByte = uint8View[0];
const lastTwoBytes = [uint8View[uint8View.length - 2], uint8View[uint8View.length - 1]];
return (firstByte === firstDelimiter) && (lastDelimiters.includes(lastTwoBytes[0]) && lastDelimiters.includes(lastTwoBytes[1]));
}
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