Bug 66425: Avoid a ClassCastException found via oss-fuzz

We try to avoid throwing ClassCastException, but it was possible
to trigger one here with a specially crafted input-file

Should fix https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=61400

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1911618 13f79535-47bb-0310-9956-ffa450edef68

poi-scratchpad/src/main/java/org/apache/poi/hsmf/datatypes/RecipientChunks.java

@@ -187,7 +187,7 @@ public final class RecipientChunks implements ChunkGroupWithProperties {
     }
 
     /** Holds all the chunks that were found. */
-    private List<Chunk> allChunks = new ArrayList<>();
+    private final List<Chunk> allChunks = new ArrayList<>();
 
     @Override
     public Map<MAPIProperty, List<PropertyValue>> getProperties() {
@@ -212,6 +212,7 @@ public final class RecipientChunks implements ChunkGroupWithProperties {
      */
     @Override
     public void record(Chunk chunk) {
+        try {
             if (chunk.getChunkId() == RECIPIENT_SEARCH.id) {
                 // TODO - parse
                 recipientSearchChunk = (ByteChunk) chunk;
@@ -228,6 +229,10 @@ public final class RecipientChunks implements ChunkGroupWithProperties {
             } else if (chunk instanceof PropertiesChunk) {
                 recipientProperties = (PropertiesChunk) chunk;
             }
+        } catch (ClassCastException e) {
+            throw new IllegalArgumentException("ChunkId and type of chunk did not match, had id " +
+                    chunk.getChunkId() + " and type of chunk: " + chunk.getClass(), e);
+        }
 
         // And add to the main list
         allChunks.add(chunk);