Fix image optimization evaluation

Don't attempt to pass data through a JPEG filter if we are unable to
filter the data.

1 files changed, 13 insertions, 10 deletions

diff --git a/qpdf/qpdf.cc b/qpdf/qpdf.cc
index 1f8aea50..418da7f1 100644
--- a/qpdf/qpdf.cc
+++ b/qpdf/qpdf.cc
@@ -3548,16 +3548,7 @@ ImageOptimizer::makePipeline(std::string const& description, Pipeline* next)
 bool
 ImageOptimizer::evaluate(std::string const& description)
 {
-    Pl_Discard d;
-    Pl_Count c("count", &d);
-    PointerHolder<Pipeline> p = makePipeline(description, &c);
-    if (p.getPointer() == 0)
-    {
-        // message issued by makePipeline
-        return false;
-    }
-    if (! image.pipeStreamData(p.getPointer(), 0, qpdf_dl_specialized,
-                               true, false))
+    if (! image.pipeStreamData(0, 0, qpdf_dl_specialized, true))
     {
         QTC::TC("qpdf", "qpdf image optimize no pipeline");
         if (o.verbose)
@@ -3569,6 +3560,18 @@ ImageOptimizer::evaluate(std::string const& description)
         }
         return false;
     }
+    Pl_Discard d;
+    Pl_Count c("count", &d);
+    PointerHolder<Pipeline> p = makePipeline(description, &c);
+    if (p.getPointer() == 0)
+    {
+        // message issued by makePipeline
+        return false;
+    }
+    if (! image.pipeStreamData(p.getPointer(), 0, qpdf_dl_specialized))
+    {
+        return false;
+    }
     long long orig_length = image.getDict().getKey("/Length").getIntValue();
     if (c.getCount() >= orig_length)
     {