From ff5007fdeabc58d8948525f8e9b48425ae75ed68 Mon Sep 17 00:00:00 2001
From: Dan Stillman <dstillman@zotero.org>
Date: Wed, 3 Sep 2014 19:39:32 -0400
Subject: [PATCH] Fix error fetching empty file via File.getContentsAsync()

---
 chrome/content/zotero/xpcom/file.js | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/chrome/content/zotero/xpcom/file.js b/chrome/content/zotero/xpcom/file.js
index 6da8901a66..3605d715fb 100644
--- a/chrome/content/zotero/xpcom/file.js
+++ b/chrome/content/zotero/xpcom/file.js
@@ -212,10 +212,20 @@ Zotero.File = new function(){
 			}
 			
 			try {
+				var bytesToFetch = inputStream.available();
+				if (maxLength && maxLength < bytesToFetch) {
+					bytesToFetch = maxLength;
+				}
+				
+				if (bytesToFetch == 0) {
+					deferred.resolve("");
+					return;
+				}
+				
 				deferred.resolve(
 					NetUtil.readInputStreamToString(
 						inputStream,
-						Math.min(maxLength, inputStream.available()),
+						bytesToFetch,
 						options
 					)
 				);