documenso/packages/signing/node-signpdf/dist/helpers/plainAddPlaceholder/getPageRef.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true,
});
exports.default = getPageRef;

var _getPagesDictionaryRef = _interopRequireDefault(require("./getPagesDictionaryRef"));

var _findObject = _interopRequireDefault(require("./findObject"));

function _interopRequireDefault(obj) {
  return obj && obj.__esModule ? obj : { default: obj };
}

/**
 * Finds the reference to a page.
 *
 * @param {Buffer} pdfBuffer
 * @param {Object} info As extracted from readRef()
 */
function getPageRef(pdfBuffer, info) {
  const pagesRef = (0, _getPagesDictionaryRef.default)(info);
  const pagesDictionary = (0, _findObject.default)(pdfBuffer, info.xref, pagesRef);
  const kidsPosition = pagesDictionary.indexOf("/Kids");
  const kidsStart = pagesDictionary.indexOf("[", kidsPosition) + 1;
  const kidsEnd = pagesDictionary.indexOf("]", kidsPosition);
  const pages = pagesDictionary.slice(kidsStart, kidsEnd).toString();
  const split = pages.trim().split(" ", 3);
  return `${split[0]} ${split[1]} ${split[2]}`;
}