utilize moz-chunked-text when given the option

1 files changed, 20 insertions, 8 deletions

diff --git a/lib/caldav/xhr.js b/lib/caldav/xhr.js
index 230f656..d49186b 100644
--- a/lib/caldav/xhr.js
+++ b/lib/caldav/xhr.js
@@ -86,7 +86,6 @@
       } else {
         xhr = new this.xhrClass();
       }
-
       // This hack is in place due to some platform
       // bug in gecko when using mozSystem xhr
       // the credentials only seem to work as expected
@@ -101,6 +100,12 @@
         ));
       }
 
+      var useMozChunkedText = false;
+      if (this.globalXhrOptions && this.globalXhrOptions.useMozChunkedText) {
+        useMozChunkedText = true;
+        xhr.responseType = 'moz-chunked-text';
+      }
+
       for (header in this.headers) {
         if (Object.hasOwnProperty.call(this.headers, header)) {
           xhr.setRequestHeader(header, this.headers[header]);
@@ -114,13 +119,20 @@
       if ('onprogress' in xhr) {
         hasProgressEvents = true;
         var last = 0;
-        xhr.onprogress = function onProgress(event) {
-          var chunk = xhr.responseText.substr(last, event.loaded);
-          last = event.loaded;
-          if (this.ondata) {
-            this.ondata(chunk);
-          }
-        }.bind(this);
+
+        if (useMozChunkedText) {
+          xhr.onprogress = function onChunkedProgress(event) {
+            this.ondata(xhr.responseText);
+          }.bind(this);
+        } else {
+          xhr.onprogress = function onProgress(event) {
+            var chunk = xhr.responseText.substr(last, event.loaded);
+            last = event.loaded;
+            if (this.ondata) {
+              this.ondata(chunk);
+            }
+          }.bind(this);
+        }
       }
 
       xhr.onreadystatechange = function onReadyStateChange() {