Function detectBOM

src/pkg/utils/encoding.ts:225–237

(u8: Uint8Array)

};

const detectBOM = (u8: Uint8Array): string | null => {
  // UTF-8 BOM
  if (u8[0] === 0xef && u8[1] === 0xbb && u8[2] === 0xbf) return "utf-8";

  // UTF-16
  if (u8[0] === 0xff && u8[1] === 0xfe) return u8[2] === 0 && u8[3] === 0 ? "utf-32le" : "utf-16le";
  if (u8[0] === 0xfe && u8[1] === 0xff) return "utf-16be";

  // UTF-32BE
  if (u8[0] === 0 && u8[1] === 0 && u8[2] === 0xfe && u8[3] === 0xff) return "utf-32be";

  return null;
};

function guessByNullPattern(u8: Uint8Array, size = u8.length): string | null {
  if (size < 64) return null;