do not translate gif images into png images for thumbnails. Instead,

stream the original to the search result thumb viewer. This has two
reasons:
- animated gifs cause 100% cpu and deadlocks in the jvm gif parser; a
known bug which is obviously not yet fixed
- animated gifs now appear in the search result also as animation

htroot/ViewImage.java

@@ -34,6 +34,7 @@ import java.net.MalformedURLException;
 import java.util.Map;
 
 import net.yacy.cora.document.id.DigestURL;
+import net.yacy.cora.document.id.MultiProtocolURL;
 import net.yacy.cora.federate.yacy.CacheStrategy;
 import net.yacy.cora.protocol.ClientIdentification;
 import net.yacy.cora.protocol.Domains;
@@ -144,6 +145,11 @@ public class ViewImage {
                 }
             }
             
+            // gif images are not loaded because of an animated gif bug within jvm which sends java into an endless loop with high CPU
+            if (ext.equals("gif") && "gif".equals(MultiProtocolURL.getFileExtension(url.getFileName()))) {
+                return new ByteArrayInputStream(imgb);
+            }
+            
             // read image
             image = ImageParser.parse(urlString, imgb);
 

htroot/yacysearchitem.java

@@ -296,11 +296,12 @@ public class yacysearchitem {
             try {
                 image = theSearch.oneImageResult(item, timeout);
                 final String imageUrlstring = image.imageUrl.toNormalform(true);
+                final String imageUrlExt = MultiProtocolURL.getFileExtension(imageUrlstring);
                 final String target = sb.getConfig(imageUrlstring.matches(target_special_pattern) ? SwitchboardConstants.SEARCH_TARGET_SPECIAL : SwitchboardConstants.SEARCH_TARGET_DEFAULT, "_self");
 
                 final String license = URLLicense.aquireLicense(image.imageUrl); // this is just the license key to get the image forwarded through the YaCy thumbnail viewer, not an actual lawful license
                 //sb.loader.loadIfNotExistBackground(image.imageUrl, 1024 * 1024 * 10, null, ClientIdentification.yacyIntranetCrawlerAgent);
-                prop.putHTML("content_item_hrefCache", "/ViewImage.png?maxwidth=128&maxheight=128&isStatic=true&quadratic=&url=" + imageUrlstring);
+                prop.putHTML("content_item_hrefCache", "/ViewImage." + ("gif".equals(imageUrlExt) ? "gif" : "png") + "?maxwidth=128&maxheight=128&isStatic=true&quadratic=&url=" + imageUrlstring);
                 prop.putHTML("content_item_href", imageUrlstring);
                 prop.putHTML("content_item_target", target);
                 prop.put("content_item_code", license);