Function createMinimalPdf

src/parser/document-parser.test.ts:13–95

* Helper to create a minimal PDF for testing.

(options: {
  version?: string;
  headerOffset?: number;
  garbageBeforeHeader?: string;
  objects?: Array<{ objNum: number; content: string }>;
  xrefEntries?: Array<{ objNum: number; offset: number; gen?: number; free?: boolean }>;
  extraXrefEntries?: Array<{ objNum: number; offset: number; gen?: number; free?: boolean }>;
  trailer?: Record<string, string>;
})

 * Helper to create a minimal PDF for testing.
 */
function createMinimalPdf(options: {
  version?: string;
  headerOffset?: number;
  garbageBeforeHeader?: string;
  objects?: Array<{ objNum: number; content: string }>;
  xrefEntries?: Array<{ objNum: number; offset: number; gen?: number; free?: boolean }>;
  extraXrefEntries?: Array<{ objNum: number; offset: number; gen?: number; free?: boolean }>;
  trailer?: Record<string, string>;
}): Uint8Array {
  const parts: string[] = [];

  // Add garbage before header if specified
  if (options.garbageBeforeHeader) {
    parts.push(options.garbageBeforeHeader);
  }

  // Header
  const version = options.version ?? "1.4";
  parts.push(`%PDF-${version}\n`);
  parts.push("%\x80\x81\x82\x83\n"); // Binary marker

  // Track offsets for xref (byte lengths, not string lengths — the binary
  // marker encodes to multiple UTF-8 bytes per char)
  const byteLength = (s: string): number => new TextEncoder().encode(s).length;

  const offsets: Array<{ objNum: number; offset: number; gen: number; free: boolean }> = [];
  let currentOffset = byteLength(parts.join(""));

  // Objects
  const objects = options.objects ?? [
    { objNum: 1, content: "<< /Type /Catalog /Pages 2 0 R >>" },
    { objNum: 2, content: "<< /Type /Pages /Kids [] /Count 0 >>" },
  ];

  for (const obj of objects) {
    offsets.push({ objNum: obj.objNum, offset: currentOffset, gen: 0, free: false });
    const objStr = `${obj.objNum} 0 obj\n${obj.content}\nendobj\n`;
    parts.push(objStr);
    currentOffset += byteLength(objStr);
  }

  // Use provided xref entries or build from objects
  const xrefEntries = options.xrefEntries ?? [
    { objNum: 0, offset: 0, gen: 65535, free: true },
    ...offsets,
  ];

  if (options.extraXrefEntries) {
    xrefEntries.push(...options.extraXrefEntries);
  }

  // XRef table
  const xrefOffset = currentOffset;
  parts.push("xref\n");
  parts.push(`0 ${xrefEntries.length}\n`);

  for (const entry of xrefEntries) {
    const offsetStr = entry.offset.toString().padStart(10, "0");