PDFBOX-5963: add logging + comment

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1924036 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

pdfbox/src/main/java/org/apache/pdfbox/pdmodel/font/encoding/DictionaryEncoding.java

@@ -18,6 +18,8 @@
 
 import java.util.HashMap;
 import java.util.Map;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 import org.apache.pdfbox.cos.COSArray;
 import org.apache.pdfbox.cos.COSBase;
 import org.apache.pdfbox.cos.COSDictionary;
@@ -31,6 +33,8 @@
  */
 public class DictionaryEncoding extends Encoding
 {
+    private static final Logger LOG = LogManager.getLogger(DictionaryEncoding.class);
+
     private final COSDictionary encoding;
     private final Encoding baseEncoding;
     private final Map<Integer, String> differences = new HashMap<>();
@@ -80,6 +84,10 @@ public DictionaryEncoding(COSDictionary fontEncoding)
             baseEncoding = Encoding.getInstance(name); // null when the name is invalid
             if (baseEncoding != null)
             {
+                // PDFBOX-5963
+                // PDF Specification: "Differences array shall specify the complete character
+                // encoding for this font" but other viewers read it, thus we do too.
+                LOG.warn("/BaseEncoding in type 3 font");
                 codeToName.putAll(baseEncoding.codeToName);
                 inverted.putAll(baseEncoding.inverted);
             }