PDFBOX-6057: check that initial position exists

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1928148 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/graphics/CurveToReplicateFinalPoint.java

@@ -20,9 +20,11 @@
 import java.util.List;
 import java.awt.geom.Point2D;
 
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
 import org.apache.pdfbox.contentstream.PDFGraphicsStreamEngine;
 import org.apache.pdfbox.contentstream.operator.MissingOperandException;
-
 import org.apache.pdfbox.cos.COSBase;
 import org.apache.pdfbox.cos.COSNumber;
 import org.apache.pdfbox.contentstream.operator.Operator;
@@ -35,6 +37,8 @@
  */
 public final class CurveToReplicateFinalPoint extends GraphicsOperatorProcessor
 {
+    private static final Logger LOG = LogManager.getLogger(CurveToReplicateFinalPoint.class);
+
     public CurveToReplicateFinalPoint(PDFGraphicsStreamEngine context)
     {
         super(context);
@@ -57,12 +61,22 @@ public void process(Operator operator, List<COSBase> operands) throws IOExceptio
         COSNumber y3 = (COSNumber)operands.get(3);
 
         PDFGraphicsStreamEngine context = getGraphicsContext();
+        Point2D currentPoint = context.getCurrentPoint();
+
         Point2D.Float point1 = context.transformedPoint(x1.floatValue(), y1.floatValue());
         Point2D.Float point3 = context.transformedPoint(x3.floatValue(), y3.floatValue());
 
-        context.curveTo(point1.x, point1.y,
-                        point3.x, point3.y,
-                        point3.x, point3.y);
+        if (currentPoint == null)
+        {
+            LOG.warn("curveTo ({},{}) without initial MoveTo", point3.x, point3.y);
+            context.moveTo(point3.x, point3.y);
+        }
+        else
+        {
+            context.curveTo(point1.x, point1.y,
+                            point3.x, point3.y,
+                            point3.x, point3.y);
+        }
     }
 
     @Override