add size check to prevent further corruption in case of read offset

core/src/main/java/com/volmit/iris/util/mantle/MantleChunk.java

@@ -109,6 +109,9 @@ public class MantleChunk {
                 din.skipTo(end);
                 TectonicPlate.addError();
             }
+            if (din.count() != start + size) {
+                throw new IOException("Chunk section read size mismatch!");
+            }
         }
     }
 

core/src/main/java/com/volmit/iris/util/matter/Matter.java

@@ -99,10 +99,9 @@ public interface Matter {
     }
 
     static Matter read(File f) throws IOException {
-        FileInputStream in = new FileInputStream(f);
-        Matter m = read(in);
-        in.close();
-        return m;
+        try (var in = new FileInputStream(f)) {
+            return read(in);
+        }
     }
 
     static Matter read(InputStream in) throws IOException {
@@ -165,6 +164,10 @@ public interface Matter {
                 }
                 din.skipTo(end);
             }
+
+            if (din.count() != start + size) {
+                throw new IOException("Matter slice read size mismatch!");
+            }
         }
 
         return matter;