Add ExtensionLevel support to version handling

All version operations are now fully aware of extension levels.

1 files changed, 24 insertions, 0 deletions

diff --git a/libqpdf/QPDF.cc b/libqpdf/QPDF.cc
index fac79796..9d5d8240 100644
--- a/libqpdf/QPDF.cc
+++ b/libqpdf/QPDF.cc
@@ -1872,6 +1872,30 @@ QPDF::getPDFVersion() const
     return this->pdf_version;
 }
 
+int
+QPDF::getExtensionLevel()
+{
+    int result = 0;
+    QPDFObjectHandle obj = getRoot();
+    if (obj.hasKey("/Extensions"))
+    {
+        obj = obj.getKey("/Extensions");
+        if (obj.isDictionary() && obj.hasKey("/ADBE"))
+        {
+            obj = obj.getKey("/ADBE");
+            if (obj.isDictionary() && obj.hasKey("/ExtensionLevel"))
+            {
+                obj = obj.getKey("/ExtensionLevel");
+                if (obj.isInteger())
+                {
+                    result = obj.getIntValue();
+                }
+            }
+        }
+    }
+    return result;
+}
+
 QPDFObjectHandle
 QPDF::getTrailer()
 {