From 4d78cc9f1a04605a044db46a56abb8fbc27df64c Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Fri, 11 Dec 2015 18:38:45 +0530
Subject: [PATCH] Image compression: If the compression tools return a zero
 byte image ignore it and use the original image

---
 src/calibre/utils/img.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/calibre/utils/img.py b/src/calibre/utils/img.py
index 5a1426505d..e94c192312 100644
--- a/src/calibre/utils/img.py
+++ b/src/calibre/utils/img.py
@@ -105,6 +105,12 @@ def run_optimizer(file_path, cmd, as_filter=False, input_data=None):
         if p.wait() != 0:
             return raw
         else:
+            try:
+                sz = os.path.getsize(outfile)
+            except EnvironmentError:
+                sz = 0
+            if sz < 1:
+                return raw
             shutil.copystat(file_path, outfile)
             atomic_rename(outfile, file_path)
     finally: