Function parseFileSpec

src/attachments/file-spec.ts:168–235

(
  fileSpec: PdfDict,
  name: string,
  resolver: RefResolver,
)

 * @returns AttachmentInfo or null if external file reference
 */
export function parseFileSpec(
  fileSpec: PdfDict,
  name: string,
  resolver: RefResolver,
): AttachmentInfo | null {
  // Get the embedded file stream
  const stream = getEmbeddedFileStream(fileSpec, resolver);

  if (!stream) {
    // External file reference - we don't support these
    return null;
  }

  const info: AttachmentInfo = {
    name,
    filename: getFilename(fileSpec),
  };

  // Get description
  const desc = fileSpec.getString("Desc");

  if (desc) {
    info.description = desc.asString();
  }

  // Get MIME type from stream's /Subtype
  const subtype = stream.getName("Subtype");

  if (subtype) {
    // /Subtype is a name like /application#2Fpdf
    // Need to decode the # sequences
    info.mimeType = subtype.value.replaceAll("#2F", "/").replaceAll("#20", " ");
  }

  // Get params from stream
  const params = stream.getDict("Params", resolver);

  if (params) {
    // Size
    const size = params.getNumber("Size");

    if (size) {
      info.size = size.value;
    }

    // Creation date
    const creationDate = params.getString("CreationDate");

    if (creationDate) {
      info.createdAt = parsePdfDate(creationDate.asString());
    }

    // Modification date
    const modDate = params.getString("ModDate");

    if (modDate) {
      info.modifiedAt = parsePdfDate(modDate.asString());
    }