Bugzilla #38135:

Added support for RFC 2397 "data" URLs.
Submitted by: Richard Wheeldon <richardw.at.geoquip-rnd.demon.co.uk>

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@366184 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/fop/apps/FOURIResolver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2005 The Apache Software Foundation.
+ * Copyright 2005-2006 The Apache Software Foundation.
  * 
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,10 +14,11 @@
  * limitations under the License.
  */
 
-/* $Id: $ */
+/* $Id$ */
 
 package org.apache.fop.apps;
 
+import java.io.ByteArrayInputStream;
 import java.io.File;
 import java.net.MalformedURLException;
 import java.net.URL;
@@ -28,6 +29,9 @@ import javax.xml.transform.stream.StreamSource;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
+// base64 support for "data" urls
+import org.apache.batik.util.Base64DecodeStream;
+
 /**
  * Provides FOP specific URI resolution.
  * This is the default URIResolver {@link FOUserAgent} will use unless overidden.
@@ -70,6 +74,8 @@ public class FOURIResolver
             } catch (MalformedURLException mfue) {
                 log.error("Could not convert filename to URL: " + mfue.getMessage(), mfue); 
             }
+        } else if (href.startsWith("data:")) {
+            return parseDataURI(href);
         } else {
             URL baseURL = toBaseURL(base);
             if (baseURL == null) {
@@ -151,5 +157,25 @@ public class FOURIResolver
         }
         return null;
     }
-    
+
+    /**
+     * Parses inline data URIs as generated by MS Word's XML export and FO stylesheet.
+     * @see <a href="http://www.ietf.org/rfc/rfc2397">RFC 2397</a>
+     */
+    private Source parseDataURI(String href) {
+        int commaPos = href.indexOf(',');
+        // header is of the form data:[<mediatype>][;base64]
+        String header = href.substring(0, commaPos);
+        String data = href.substring(commaPos + 1);
+        if (header.endsWith(";base64")) {
+            byte[] bytes = data.getBytes();
+            ByteArrayInputStream encodedStream = new ByteArrayInputStream(bytes);
+            Base64DecodeStream decodedStream = new Base64DecodeStream(encodedStream);
+            return new StreamSource(decodedStream);
+        } else {
+            //Note that this is not quite the full story here. But since we are only interested
+            //in base64-encoded binary data, the next line will probably never be called.
+            return new StreamSource(new java.io.StringReader(data));
+        }
+    }
 }

status.xml

@@ -27,6 +27,9 @@
 
   <changes>
     <release version="FOP Trunk">
+      <action context="Code" dev="JM" type="add" fixes-bug="38132" due-to="Richard Wheeldon">
+        Added support for RFC2397 "data" URLs.
+      </action>
       <action context="Code" dev="JM" type="fix" fixes-bug="38132">
         Bugfix: Certain border styles could lead to a NullPointerException.
       </action>