[gexiv2/wip/59: 3/5] win32: Handle non-unicode exiv2 case

[Jens Georg <jensgeorg src gnome org>]

commit 12973dd45ad3a9ef9b74da6f03c69bd8643290a2
Author: Jens Georg <mail jensge org>
Date:   Sat Nov 14 17:39:04 2020 +0100

    win32: Handle non-unicode exiv2 case
    
    If exiv2 is not compiled with windows unicode support, we need to
    convert the path to the locale from utf8.
    
    It can happen that this doesn't work (e.g. converting a russian filename
    on a german locale)
    
    Addresses #59

 gexiv2/gexiv2-metadata.cpp | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
---
diff --git a/gexiv2/gexiv2-metadata.cpp b/gexiv2/gexiv2-metadata.cpp
index 84f778a..b51c84d 100644
--- a/gexiv2/gexiv2-metadata.cpp
+++ b/gexiv2/gexiv2-metadata.cpp
@@ -23,6 +23,10 @@
 #include <glib-object.h>
 #include <gio/gio.h>
 
+#ifdef G_OS_WIN32
+#include <glib/gwin32.h>
+#endif
+
 #include <exiv2/exiv2.hpp>
 
 #if EXIV2_TEST_VERSION(0,27,99)
@@ -376,8 +380,22 @@ gboolean gexiv2_metadata_open_path (GExiv2Metadata *self, const gchar *path, GEr
         }
         file.append(wfile);
         g_free(wfile);
+#else
+#ifdef G_OS_WIN32
+        char* local_path = g_win32_locale_filename_from_utf8(path);
+        if (local_path == nullptr) {
+            char *msg = g_strdup_printf("Failed to convert \"%s\" to locale \"%s\"", path, 
g_win32_getlocale());
+            g_set_error_literal(error, G_IO_ERROR, G_IO_ERROR_INVALID_FILENAME, msg);
+
+            g_free(msg);
+
+            return FALSE;
+        }
+        file = local_path;
+        g_free(local_path);
 #else
         file = path;
+#endif
 #endif
         self->priv->image = Exiv2::ImageFactory::open (file);