Function encodePdfDocEncoding

src/helpers/encoding.ts:219–261

(text: string)

 * Returns null if string contains characters not in PDFDocEncoding.
 */
export function encodePdfDocEncoding(text: string): Uint8Array | null {
  const bytes: number[] = [];

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

    // Check reverse mapping first (for special chars like €, •, —)
    const mapped = UNICODE_TO_PDF_DOC.get(code);

    if (mapped !== undefined) {
      bytes.push(mapped);

      continue;
    }

    // Tab, newline, carriage return
    if (code === TAB || code === LF || code === CR) {
      bytes.push(code);

      continue;
    }

    // ASCII printable range
    if (code >= 0x20 && code <= 0x7f) {
      bytes.push(code);

      continue;
    }

    // Latin-1 supplement (0xA1-0xFF, except 0xAD which is undefined)
    if (code >= 0xa1 && code <= 0xff && code !== 0xad) {
      bytes.push(code);

      continue;
    }

    // Cannot encode this character
    return null;
  }

  return new Uint8Array(bytes);
}

/**
 * Encode string as UTF-16BE with BOM.