Improved Safari download performance

app/js/lib/mtproto_wrapper.js

@@ -492,6 +492,7 @@ angular.module('izhukov.mtproto.wrapper', ['izhukov.utils', 'izhukov.mtproto'])
               }, {
                 dcID: dcID,
                 fileDownload: true,
+                singleInRequest: true,
                 createNetworker: true
               });
             }, 2).then(function (result) {

app/js/lib/ng_utils.js

@@ -40,7 +40,12 @@ angular.module('izhukov.utils', [])
       return {then: function (cb) {
         return cb(result);
       }};
-    }
+    },
+    reject: function (result) {
+      return {then: function (cb, badcb) {
+        return badcb(result);
+      }};
+    },
   }
 
 })
@@ -109,7 +114,7 @@ angular.module('izhukov.utils', [])
 
   function chooseSaveFile (fileName, ext, mimeType) {
     if (!$window.chrome || !chrome.fileSystem || !chrome.fileSystem.chooseEntry) {
-      return $q.reject();
+      return qSync.reject();
     };
     var deferred = $q.defer();
 

app/js/services.js

@@ -2610,7 +2610,7 @@ angular.module('myApp.services', ['myApp.i18n', 'izhukov.utils'])
 })
 
 
-.service('AppVideoManager', function ($sce, $rootScope, $modal, $window, MtpApiFileManager, AppUsersManager, FileManager) {
+.service('AppVideoManager', function ($sce, $rootScope, $modal, $window, MtpApiFileManager, AppUsersManager, FileManager, qSync) {
   var videos = {},
       videosForHistory = {},
       windowW = $(window).width(),
@@ -2736,6 +2736,13 @@ angular.module('myApp.services', ['myApp.i18n', 'izhukov.utils'])
           access_hash: video.access_hash
         };
 
+    if (historyVideo.downloaded && !toFileEntry) {
+      var cachedBlob = MtpApiFileManager.getCachedFile(inputFileLocation);
+      if (cachedBlob) {
+        return qSync.when(cachedBlob);
+      }
+    }
+
     historyVideo.progress = {enabled: !historyVideo.downloaded, percent: 1, total: video.size};
 
     var downloadPromise = MtpApiFileManager.downloadFile(video.dc_id, inputFileLocation, video.size, {