upb: Add upb_Message_GetExtensionArray

PiperOrigin-RevId: 696640453

upb/message/accessors.h

@@ -203,6 +203,9 @@ UPB_API_INLINE upb_Message* upb_Message_GetExtensionMessage(
     const upb_Message* msg, const upb_MiniTableExtension* f,
     struct upb_Message* default_val);
 
+UPB_API_INLINE const upb_Array* upb_Message_GetExtensionArray(
+    const upb_Message* msg, const upb_MiniTableExtension* f);
+
 // Extension Setters ///////////////////////////////////////////////////////////
 
 UPB_API_INLINE bool upb_Message_SetExtension(upb_Message* msg,

upb/message/internal/accessors.h

@@ -1017,6 +1017,19 @@ UPB_API_INLINE struct upb_Message* upb_Message_GetExtensionMessage(
   return ret;
 }
 
+// Repeated
+UPB_API_INLINE const upb_Array* upb_Message_GetExtensionArray(
+    const struct upb_Message* msg, const upb_MiniTableExtension* e) {
+  UPB_ASSUME(UPB_PRIVATE(_upb_MiniTableField_GetRep)(&e->UPB_PRIVATE(field)) ==
+             kUpb_FieldRep_NativePointer);
+  UPB_ASSUME(upb_MiniTableField_IsArray(&e->UPB_PRIVATE(field)));
+  UPB_ASSUME(e->UPB_PRIVATE(field).presence == 0);
+  upb_Array* ret;
+  const upb_Array* default_val = NULL;
+  _upb_Message_GetExtensionField(msg, e, &default_val, &ret);
+  return ret;
+}
+
 #ifdef __cplusplus
 } /* extern "C" */
 #endif