From 928b89382e6b2350e740c481e7d6f44e8405e43c Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Tue, 24 Jul 2018 15:02:14 +0200
Subject: [PATCH] [api-minor] Add an `IsLinearized` property to the
 `PDFDocument.documentInfo` getter, to allow accessing the linearization
 status through the API (via `PDFDocumentProxy.getMetadata`)

There was a (somewhat) recent question on IRC about accessing the linearization status of a PDF document, and this patch contains a simple way to expose that through already existing API methods.
Please note that during setup/parsing in `PDFDocument` the linearization data is already being fetched and parsed, provided of course that it exists. Hence this patch will *not* cause any additional data to be loaded.
---
 src/core/document.js  |  5 +++--
 test/unit/api_spec.js | 18 +++++++++++++-----
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/src/core/document.js b/src/core/document.js
index dfc46df98..df243e1bb 100644
--- a/src/core/document.js
+++ b/src/core/document.js
@@ -535,12 +535,13 @@ var PDFDocument = (function PDFDocumentClosure() {
       return shadow(this, 'numPages', num);
     },
     get documentInfo() {
-      var docInfo = {
+      const docInfo = {
         PDFFormatVersion: this.pdfFormatVersion,
+        IsLinearized: !!this.linearization,
         IsAcroFormPresent: !!this.acroForm,
         IsXFAPresent: !!this.xfa,
       };
-      var infoDict;
+      let infoDict;
       try {
         infoDict = this.xref.trailer.get('Info');
       } catch (err) {
diff --git a/test/unit/api_spec.js b/test/unit/api_spec.js
index 2f79d4cc3..1a643e0ae 100644
--- a/test/unit/api_spec.js
+++ b/test/unit/api_spec.js
@@ -28,6 +28,7 @@ import {
 } from '../../src/display/api';
 import { GlobalWorkerOptions } from '../../src/display/worker_options';
 import isNodeJS from '../../src/shared/is_node';
+import { Metadata } from '../../src/display/metadata';
 
 describe('api', function() {
   let basicApiFileName = 'basicapi.pdf';
@@ -802,11 +803,18 @@ describe('api', function() {
     });
     it('gets metadata', function(done) {
       var promise = doc.getMetadata();
-      promise.then(function(metadata) {
-        expect(metadata.info['Title']).toEqual('Basic API Test');
-        expect(metadata.info['PDFFormatVersion']).toEqual('1.7');
-        expect(metadata.metadata.get('dc:title')).toEqual('Basic API Test');
-        expect(metadata.contentDispositionFilename).toEqual(null);
+      promise.then(function({ info, metadata, contentDispositionFilename, }) {
+        expect(info['Title']).toEqual('Basic API Test');
+        // The following are PDF.js specific, non-standard, properties.
+        expect(info['PDFFormatVersion']).toEqual('1.7');
+        expect(info['IsLinearized']).toEqual(false);
+        expect(info['IsAcroFormPresent']).toEqual(false);
+        expect(info['IsXFAPresent']).toEqual(false);
+
+        expect(metadata instanceof Metadata).toEqual(true);
+        expect(metadata.get('dc:title')).toEqual('Basic API Test');
+
+        expect(contentDispositionFilename).toEqual(null);
         done();
       }).catch(function (reason) {
         done.fail(reason);