PDFBOX-6105: maxComponentDepth should be at least 1

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1929989 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

fontbox/src/main/java/org/apache/fontbox/ttf/GlyphTable.java

@@ -174,7 +174,7 @@ private GlyphData getGlyphData(int gid, int level) throws IOException
     {
         if (level > maxp.getMaxComponentDepth())
         {
-            throw new IOException("composite glyph maximum level reached");
+            throw new IOException("composite glyph maximum level (" + maxp.getMaxComponentDepth() + ") reached");
         }
         GlyphData glyph = new GlyphData();
         int leftSideBearing = hmt == null ? 0 : hmt.getLeftSideBearing(gid);

fontbox/src/main/java/org/apache/fontbox/ttf/MaximumProfileTable.java

@@ -18,13 +18,18 @@
 
 import java.io.IOException;
 
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
 /**
  * This 'maxp'-table is a required table in a TrueType font.
  *
  * @author Ben Litchfield
  */
 public class MaximumProfileTable extends TTFTable
 {
+    private static final Logger LOG = LogManager.getLogger(MaximumProfileTable.class);
+
     /**
      * A tag that identifies this table type.
      */
@@ -48,7 +53,6 @@ public class MaximumProfileTable extends TTFTable
 
     MaximumProfileTable()
     {
-        super();
     }
 
     /**
@@ -289,6 +293,11 @@ void read(TrueTypeFont ttf, TTFDataStream data) throws IOException
             maxSizeOfInstructions = data.readUnsignedShort();
             maxComponentElements = data.readUnsignedShort();
             maxComponentDepth = data.readUnsignedShort();
+            if (maxComponentDepth == 0)
+            {
+                LOG.warn("maxComponentDepth is 0, set to 1");
+                maxComponentDepth = 1;
+            }
         }
         initialized = true;
     }