Function getPdfVersion

src/test-utils.ts:193–215

(bytes: Uint8Array)

 * @returns The version string (e.g., "1.4") or null if not found
 */
export function getPdfVersion(bytes: Uint8Array) {
  if (!isPdfHeader(bytes)) {
    return null;
  }

  // Find the newline after the header
  let end = 5;

  while (end < bytes.length && end < 20) {
    const b = bytes[end];
    if (b === 0x0a || b === 0x0d) {
      break;
    }
    end++;
  }

  // Extract version (e.g., "1.4" from "%PDF-1.4")
  const header = String.fromCharCode(...bytes.slice(0, end));

  const match = header.match(/%PDF-(\d+\.\d+)/);

  return match?.[1] ?? null;
}

/**
 * Save test output to the test-output directory for manual inspection.