[empathy] utils: Add empathy_xml_validate_from_resource()

[Emanuele Aina <emaaa src gnome org>]

commit 4299f29ac941292054b4e004aac51e1b143a386a
Author: Emanuele Aina <emanuele aina collabora com>
Date:   Tue Mar 26 13:00:17 2013 +0100

    utils: Add empathy_xml_validate_from_resource()
    
    Validate against dtd stored in a GResource.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=696974

 libempathy/empathy-utils.c |   35 +++++++++++++++++++++++++++++++++++
 libempathy/empathy-utils.h |    2 ++
 2 files changed, 37 insertions(+), 0 deletions(-)
---
diff --git a/libempathy/empathy-utils.c b/libempathy/empathy-utils.c
index 74770c1..e074327 100644
--- a/libempathy/empathy-utils.c
+++ b/libempathy/empathy-utils.c
@@ -109,6 +109,41 @@ empathy_init (void)
 }
 
 gboolean
+empathy_xml_validate_from_resource (xmlDoc *doc,
+    const gchar *dtd_resourcename)
+{
+  GBytes *resourcecontents;
+  gconstpointer resourcedata;
+  gsize resourcesize;
+  xmlParserInputBufferPtr buffer;
+  xmlValidCtxt  cvp;
+  xmlDtd *dtd;
+  GError *error = NULL;
+  gboolean ret;
+
+  DEBUG ("Loading dtd resource %s", dtd_resourcename);
+
+  resourcecontents = g_resources_lookup_data (dtd_resourcename, G_RESOURCE_LOOKUP_FLAGS_NONE, &error);
+  if (error != NULL)
+    {
+      g_warning ("Unable to load dtd resource '%s': %s", dtd_resourcename, error->message);
+      g_error_free (error);
+      return FALSE;
+    }
+  resourcedata = g_bytes_get_data (resourcecontents, &resourcesize);
+  buffer = xmlParserInputBufferCreateStatic (resourcedata, resourcesize, XML_CHAR_ENCODING_UTF8);
+
+  memset (&cvp, 0, sizeof (cvp));
+  dtd = xmlIOParseDTD (NULL, buffer, XML_CHAR_ENCODING_UTF8);
+  ret = xmlValidateDtd (&cvp, doc, dtd);
+
+  xmlFreeDtd (dtd);
+  g_bytes_unref (resourcecontents);
+
+  return ret;
+}
+
+gboolean
 empathy_xml_validate (xmlDoc      *doc,
     const gchar *dtd_filename)
 {
diff --git a/libempathy/empathy-utils.h b/libempathy/empathy-utils.h
index 5fe79e9..7077d83 100644
--- a/libempathy/empathy-utils.h
+++ b/libempathy/empathy-utils.h
@@ -44,6 +44,8 @@ G_BEGIN_DECLS
 void empathy_init (void);
 
 /* XML */
+gboolean empathy_xml_validate_from_resource (xmlDoc *doc,
+    const gchar *dtd_resourcename);
 gboolean empathy_xml_validate (xmlDoc *doc,
     const gchar *dtd_filename);
 xmlNodePtr empathy_xml_node_get_child (xmlNodePtr node,