blockfilter: Functions to translate filter types to/from names.

src/blockfilter.h

@@ -6,6 +6,7 @@
 #define BITCOIN_BLOCKFILTER_H
 
 #include <stdint.h>
+#include <string>
 #include <unordered_set>
 #include <vector>
 
@@ -89,6 +90,12 @@ enum class BlockFilterType : uint8_t
     INVALID = 255,
 };
 
+/** Get the human-readable name for a filter type. Returns empty string for unknown types. */
+const std::string& BlockFilterTypeName(BlockFilterType filter_type);
+
+/** Find a filter type by its human-readable name. */
+bool BlockFilterTypeByName(const std::string& name, BlockFilterType& filter_type);
+
 /**
  * Complete block filter struct as defined in BIP 157. Serialization matches
  * payload of "cfilter" messages.