plugins: Simplify plugin/codec API versioning

Replace the minimum version bound with a check on the size of
the API struct. The version only needs to be incremented for
ABI breaking changes. Additions to the API won't need to touch
the version number, resulting in fewer merge conflicts.

Change-Id: I916a04a7bf5890dcf5d615ce30087643165f8e1f

1 files changed, 4 insertions, 1 deletions

diff --git a/apps/plugins/imageviewer/image_decoder.c b/apps/plugins/imageviewer/image_decoder.c
index eab1c01dbc..0c1776daaa 100644
--- a/apps/plugins/imageviewer/image_decoder.c
+++ b/apps/plugins/imageviewer/image_decoder.c
@@ -155,7 +155,10 @@ const struct image_decoder *load_decoder(struct loader_info *loader_info)
         goto error_close;
     }
 
-    if (lc_hdr->api_version != IMGDEC_API_VERSION)
+    if (lc_hdr->api_version != IMGDEC_API_VERSION ||
+        hdr->img_api_size > sizeof(struct imgdec_api) ||
+        hdr->plugin_api_version != PLUGIN_API_VERSION ||
+        hdr->plugin_api_size > sizeof(struct plugin_api))
     {
         rb->splashf(2*HZ, "%s decoder: Incompatible version.", name);
         goto error_close;