Function encodeUtf16BE

src/helpers/encoding.ts:266–287

(text: string)

 * Encode string as UTF-16BE with BOM.
 */
export function encodeUtf16BE(text: string): Uint8Array {
  const bytes: number[] = [0xfe, 0xff]; // BOM

  for (const char of text) {
    // biome-ignore lint/style/noNonNullAssertion: char will exist since it's a string
    const code = char.codePointAt(0)!;

    if (code > 0xffff) {
      // Surrogate pair needed for characters outside BMP
      const adjusted = code - 0x10000;
      const high = 0xd800 + (adjusted >> 10);
      const low = 0xdc00 + (adjusted & 0x3ff);

      bytes.push(high >> 8, high & 0xff);
      bytes.push(low >> 8, low & 0xff);
    } else {
      bytes.push(code >> 8, code & 0xff);
    }
  }

  return new Uint8Array(bytes);
}

/**
 * Encode string for PDF text string.