[gimp/metadata-wip-rebased: 16/20] libgimpbase: add gimp_metadata_new() and stubs to set EXIF and XMP data blobs

[Michael Natterer <mitch src gnome org>]

commit c22e1aa0249d560d700b7062e3a40b7ec1500f50
Author: Michael Natterer <mitch gimp org>
Date:   Wed Oct 23 22:33:22 2013 +0200

    libgimpbase: add gimp_metadata_new() and stubs to set EXIF and XMP data blobs

 libgimpbase/gimpbase.def   |    3 ++
 libgimpbase/gimpmetadata.c |   62 ++++++++++++++++++++++++++++++++++++--------
 libgimpbase/gimpmetadata.h |    9 ++++++
 3 files changed, 63 insertions(+), 11 deletions(-)
---
diff --git a/libgimpbase/gimpbase.def b/libgimpbase/gimpbase.def
index 6d87e07..8355008 100644
--- a/libgimpbase/gimpbase.def
+++ b/libgimpbase/gimpbase.def
@@ -54,9 +54,12 @@ EXPORTS
        gimp_metadata_get_resolution
        gimp_metadata_is_tag_supported
        gimp_metadata_load_from_file
+       gimp_metadata_new
        gimp_metadata_save_to_file
        gimp_metadata_serialize
        gimp_metadata_set_bits_per_sample
+       gimp_metadata_set_from_exif
+       gimp_metadata_set_from_xmp
        gimp_metadata_set_pixel_size
        gimp_metadata_set_resolution
        gimp_micro_version
diff --git a/libgimpbase/gimpmetadata.c b/libgimpbase/gimpmetadata.c
index cbe5a21..ce2a944 100644
--- a/libgimpbase/gimpmetadata.c
+++ b/libgimpbase/gimpmetadata.c
@@ -127,6 +127,27 @@ static const guint8 wilber_jpg[] =
 static const guint wilber_jpg_len = G_N_ELEMENTS (wilber_jpg);
 
 
+GimpMetadata *
+gimp_metadata_new (void)
+{
+  GExiv2Metadata *metadata = NULL;
+
+  if (gexiv2_initialize ())
+    {
+      metadata = gexiv2_metadata_new ();
+
+      if (! gexiv2_metadata_open_buf (metadata, wilber_jpg, wilber_jpg_len,
+                                      NULL))
+        {
+          g_object_unref (metadata);
+
+          return NULL;
+        }
+    }
+
+  return metadata;
+}
+
 typedef struct
 {
   gchar         name[1024];
@@ -230,23 +251,14 @@ gimp_metadata_deserialize_error (GMarkupParseContext *context,
 GExiv2Metadata *
 gimp_metadata_deserialize (const gchar *metadata_xml)
 {
-  GExiv2Metadata        *metadata = NULL;
+  GimpMetadata          *metadata;
   GMarkupParser          markup_parser;
   GimpMetadataParseData  parse_data;
   GMarkupParseContext   *context;
 
   g_return_val_if_fail (metadata_xml != NULL, NULL);
 
-  if (gexiv2_initialize ())
-    {
-      metadata = gexiv2_metadata_new ();
-
-      if (! gexiv2_metadata_open_buf (metadata, wilber_jpg, wilber_jpg_len,
-                                      NULL))
-        {
-          return NULL;
-        }
-    }
+  metadata = gimp_metadata_new ();
 
   parse_data.metadata = metadata;
 
@@ -439,6 +451,34 @@ gimp_metadata_save_to_file (GimpMetadata  *metadata,
   return success;
 }
 
+gboolean
+gimp_metadata_set_from_exif (GimpMetadata  *metadata,
+                             const guchar  *exif_data,
+                             gint           exif_data_length)
+{
+  g_return_val_if_fail (GEXIV2_IS_METADATA (metadata), FALSE);
+  g_return_val_if_fail (exif_data != NULL, FALSE);
+  g_return_val_if_fail (exif_data_length > 0, FALSE);
+
+  /* TODO */
+
+  return TRUE;
+}
+
+gboolean
+gimp_metadata_set_from_xmp (GimpMetadata  *metadata,
+                            const guchar  *xmp_data,
+                            gint           xmp_data_length)
+{
+  g_return_val_if_fail (GEXIV2_IS_METADATA (metadata), FALSE);
+  g_return_val_if_fail (xmp_data != NULL, FALSE);
+  g_return_val_if_fail (xmp_data_length > 0, FALSE);
+
+  /* TODO */
+
+  return TRUE;
+}
+
 void
 gimp_metadata_set_pixel_size (GimpMetadata *metadata,
                               gint          width,
diff --git a/libgimpbase/gimpmetadata.h b/libgimpbase/gimpmetadata.h
index 4f3e215..618d73b 100644
--- a/libgimpbase/gimpmetadata.h
+++ b/libgimpbase/gimpmetadata.h
@@ -39,6 +39,8 @@ typedef enum
 } GimpMetadataSaveFlags;
 
 
+GimpMetadata * gimp_metadata_new                 (void);
+
 GimpMetadata * gimp_metadata_deserialize         (const gchar   *metadata_xml);
 gchar        * gimp_metadata_serialize           (GimpMetadata  *metadata);
 
@@ -48,6 +50,13 @@ gboolean       gimp_metadata_save_to_file        (GimpMetadata  *metadata,
                                                   GFile         *file,
                                                   GError       **error);
 
+gboolean       gimp_metadata_set_from_exif       (GimpMetadata  *metadata,
+                                                  const guchar  *exif_data,
+                                                  gint           exif_data_length);
+gboolean       gimp_metadata_set_from_xmp        (GimpMetadata  *metadata,
+                                                  const guchar  *xmp_data,
+                                                  gint           xmp_data_length);
+
 void           gimp_metadata_set_pixel_size      (GimpMetadata  *metadata,
                                                   gint           width,
                                                   gint           height);