Fix IntegerValidator, StringValidator

incubator/validator-core/src/main/java/io/aklivity/zilla/runtime/validator/core/IntegerValidator.java

@@ -48,6 +48,6 @@ private boolean validate(
         int index,
         int length)
     {
-        return length == 4;
+        return length - index == 4;
     }
 }

incubator/validator-core/src/main/java/io/aklivity/zilla/runtime/validator/core/StringValidator.java

@@ -56,8 +56,8 @@ private boolean validate(
         int index,
         int length)
     {
-        byte[] payloadBytes = new byte[length];
-        data.getBytes(0, payloadBytes);
+        byte[] payloadBytes = new byte[length - index];
+        data.getBytes(index, payloadBytes);
         return predicate.test(payloadBytes);
     }