So there are archives not in the index, not sure what to do with it

src/main/java/net/runelite/cache/fs/Index.java

@@ -9,9 +9,13 @@ import java.util.List;
 import java.util.Objects;
 import net.runelite.cache.fs.io.InputStream;
 import net.runelite.cache.fs.io.OutputStream;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class Index implements Closeable
 {
+	private static final Logger logger = LoggerFactory.getLogger(Index.class);
+	
 	private final Store store;
 	private final IndexFile index;
 	private final int id;
@@ -227,6 +231,12 @@ public class Index implements Closeable
 		for (Archive a : archives)
 		{
 			IndexEntry entry = this.index.read(a.getArchiveId());
+			if (entry == null)
+			{
+				logger.warn("can't read archive " + a.getArchiveId() + " from index " + this.id);
+				continue;
+			}
+			
 			assert this.index.getIndexFileId() == this.id;
 			assert entry.getId() == a.getArchiveId();
 			DataFileReadResult res = store.getData().read(this.id, entry.getId(), entry.getSector(), entry.getLength()); // needs decompress etc...

src/main/java/net/runelite/cache/fs/IndexFile.java

@@ -91,11 +91,20 @@ public class IndexFile implements Closeable
 		idx.seek(id * INDEX_ENTRY_LEN);
 		int i = idx.read(buffer);
 		if (i != INDEX_ENTRY_LEN)
-			logger.warn("short read");
+		{
+			logger.warn("short read for id {}: {}", id, i);
+			return null;
+		}
 		
 		int length = ((buffer[0] & 0xFF) << 16) | ((buffer[1] & 0xFF) << 8) | (buffer[2] & 0xFF);
 		int sector = ((buffer[3] & 0xFF) << 16) | ((buffer[4] & 0xFF) << 8) | (buffer[5] & 0xFF);
 		
+		if (length <= 0 || sector <= 0)
+		{
+			logger.warn("invalid length or sector {}/{}", length, sector);
+			return null;
+		}
+		
 		return new IndexEntry(this, id, sector, length);
 	}
 	

src/main/java/net/runelite/cache/fs/Store.java

@@ -102,7 +102,7 @@ public class Store implements Closeable
 		{
 			int id = i.getIndex().getIndexFileId();
 			if (id == 5)
-				break;
+				continue;
 			i.load();
 		}
 	}