Function decodeUtf16BE

src/helpers/encoding.ts:103–129

(bytes: Uint8Array)

 * Decode UTF-16BE bytes to string (skips BOM if present).
 */
export function decodeUtf16BE(bytes: Uint8Array): string {
  const start = hasUtf16BOM(bytes) ? 2 : 0;

  const chars: string[] = [];

  for (let i = start; i < bytes.length - 1; i += 2) {
    const code = (bytes[i] << 8) | bytes[i + 1];

    // Handle surrogate pairs
    if (code >= 0xd800 && code <= 0xdbff && i + 3 < bytes.length) {
      const low = (bytes[i + 2] << 8) | bytes[i + 3];

      if (low >= 0xdc00 && low <= 0xdfff) {
        const codePoint = 0x10000 + ((code - 0xd800) << 10) + (low - 0xdc00);
        chars.push(String.fromCodePoint(codePoint));

        i += 2;

        continue;
      }
    }

    chars.push(String.fromCharCode(code));
  }

  return chars.join("");
}

/**
 * Decode PDFDocEncoding bytes to string.