1 files changed, 14 insertions, 5 deletions
diff --git a/src/protozero/filtering/message_filter.h b/src/protozero/filtering/message_filter.h
index c752b2a78..e67467b6b 100644
--- a/src/protozero/filtering/message_filter.h
+++ b/src/protozero/filtering/message_filter.h
@@ -181,11 +181,20 @@ class MessageFilter {
     uint8_t* size_field = nullptr;
     uint32_t size_field_len = 0;
 
-    // When true the next |eat_next_bytes| are copied as-is in output.
-    // It seems that keeping this field at the end rather than next to
-    // |eat_next_bytes| makes the filter a little (but measurably) faster.
-    // (likely something related with struct layout vs cache sizes).
-    bool passthrough_eaten_bytes = false;
+    // The pointer to the start of the string to update the string if it is
+    // filtered.
+    uint8_t* filter_string_ptr = nullptr;
+
+    // How |eat_next_bytes| should be handled. It seems that keeping this field
+    // at the end rather than next to |eat_next_bytes| makes the filter a little
+    // (but measurably) faster. (likely something related with struct layout vs
+    // cache sizes).
+    enum FilterAction {
+      kDrop,
+      kPassthrough,
+      kFilterString,
+    };
+    FilterAction action = FilterAction::kDrop;
   };
 
   uint32_t out_written() { return static_cast<uint32_t>(out_ - &out_buf_[0]); }