From 223c0a0fdce07cd2c8c81d71f905e40834ae9486 Mon Sep 17 00:00:00 2001
From: Daniel Kolesa <d.kolesa@samsung.com>
Date: Sun, 26 May 2019 18:35:48 +0200
Subject: [PATCH] eolian: add runtime API to get file format version

This is useful for FFI based bindings (like the Lua or Python ones)
and so on.
---
 src/bindings/luajit/eolian.lua | 2 ++
 src/lib/eolian/Eolian.h        | 9 +++++++++
 src/lib/eolian/eolian.c        | 4 ++++
 3 files changed, 15 insertions(+)

diff --git a/src/bindings/luajit/eolian.lua b/src/bindings/luajit/eolian.lua
index 5e60c89771..07959789ea 100644
--- a/src/bindings/luajit/eolian.lua
+++ b/src/bindings/luajit/eolian.lua
@@ -290,6 +290,7 @@ ffi.cdef [[
 
     int eolian_init(void);
     int eolian_shutdown(void);
+    unsigned short eolian_file_format_version_get(void);
     Eolian_State *eolian_state_new(void);
     void eolian_state_free(Eolian_State *state);
     Eolian_Panic_Cb eolian_state_panic_cb_set(Eolian_State *state, Eolian_Panic_Cb cb);
@@ -491,6 +492,7 @@ local init = function()
     eolian = util.lib_load("eolian")
     eina = util.lib_load("eina")
     eolian.eolian_init()
+    M.file_format_version = eolian.eolian_file_format_version_get()
 end
 
 local shutdown = function()
diff --git a/src/lib/eolian/Eolian.h b/src/lib/eolian/Eolian.h
index a612f3af1c..80ccd1ef94 100644
--- a/src/lib/eolian/Eolian.h
+++ b/src/lib/eolian/Eolian.h
@@ -485,6 +485,15 @@ EAPI int eolian_init(void);
  */
 EAPI int eolian_shutdown(void);
 
+/*
+ * @brief Get the Eolian file format version.
+ *
+ * This is the same as the #EOLIAN_FILE_FORMAT_VERSION macro, but allows
+ * retrieval of the version at runtime, so it can be used by FFI based
+ * bindings in dynamic languages to do runtime checks and so on.
+ */
+EAPI unsigned short eolian_file_format_version_get(void);
+
 /*
  * @brief Create a new Eolian state.
  *
diff --git a/src/lib/eolian/eolian.c b/src/lib/eolian/eolian.c
index 4a38fb90db..81067ebf44 100644
--- a/src/lib/eolian/eolian.c
+++ b/src/lib/eolian/eolian.c
@@ -68,3 +68,7 @@ EAPI int eolian_shutdown(void)
    return _eolian_init_counter;
 }
 
+EAPI unsigned short eolian_file_format_version_get(void)
+{
+   return EOLIAN_FILE_FORMAT_VERSION;
+}