gst/glib-compat-private.h: Add compatibility macro for g_intern_string() for

Original commit message from CVS:
* gst/glib-compat-private.h:
Add compatibility macro for g_intern_string() for
GLib-2.8 (any reason we can't just bump the
requirement to at least 2.10?)
* gst/gstpadtemplate.h:
* gst/gstelementfactory.c:
* gst/gstregistryxml.c:
* gst/gstregistrybinary.c:
Make GstStaticPadTemplate's templ_name field a const gchar * and fix
up the internal code accordingly.  This shouldn't be a problem, since
there is no reason external code could ever assume the string in such
a structure is dynamically allocated unless it did that itself;  the
use of g_strdup() is private to element factories.  The new code also
saves some memory by putting pad template name strings into the GLib
quark table instead of allocating them dynamically.
Declaring this field constant fixes warnings with g++-4.2 when using
the GST_STATIC_PAD_TEMPLATE macro in c++ code (#478092).

ChangeLog

@@ -1,3 +1,24 @@
+2007-09-19  Tim-Philipp Müller  <tim at centricular dot net>
+
+	* gst/glib-compat-private.h:
+	  Add compatibility macro for g_intern_string() for
+	  GLib-2.8 (any reason we can't just bump the
+	  requirement to at least 2.10?)
+
+	* gst/gstpadtemplate.h:
+	* gst/gstelementfactory.c:
+	* gst/gstregistryxml.c:
+	* gst/gstregistrybinary.c:
+	  Make GstStaticPadTemplate's templ_name field a const gchar * and fix
+	  up the internal code accordingly.  This shouldn't be a problem, since
+	  there is no reason external code could ever assume the string in such
+	  a structure is dynamically allocated unless it did that itself;  the
+	  use of g_strdup() is private to element factories.  The new code also
+	  saves some memory by putting pad template name strings into the GLib
+	  quark table instead of allocating them dynamically.
+	  Declaring this field constant fixes warnings with g++-4.2 when using
+	  the GST_STATIC_PAD_TEMPLATE macro in c++ code (#478092).
+
 2007-09-19  Stefan Kost  <ensonic@users.sf.net>
 
 	* gst/gstelementfactory.c:

gst/glib-compat-private.h

@@ -1,6 +1,6 @@
 /*
  * glib-compat.c
- * Functions copied from glib 2.8
+ * Functions copied from glib 2.10
  *
  * Copyright 2005 David Schleef <ds@schleef.org>
  */
@@ -14,4 +14,9 @@ G_BEGIN_DECLS
 
 /* adaptations */
 
+/* FIXME: remove once we depend on GLib 2.10 */
+#if (!GLIB_CHECK_VERSION (2, 10, 0))
+#define g_intern_string(s) g_quark_to_string(g_quark_from_string(s))
+#endif
+
 G_END_DECLS

gst/gstelementfactory.c

@@ -61,6 +61,8 @@
 #include "gsturi.h"
 #include "gstregistry.h"
 
+#include "glib-compat-private.h"
+
 GST_DEBUG_CATEGORY_STATIC (element_factory_debug);
 #define GST_CAT_DEFAULT element_factory_debug
 
@@ -219,7 +221,6 @@ gst_element_factory_cleanup (GstElementFactory * factory)
     GstStaticPadTemplate *templ = item->data;
     GstCaps *caps = (GstCaps *) & (templ->static_caps);
 
-    g_free (templ->name_template);
     g_free ((gchar *) templ->static_caps.string);
 
     /* FIXME: this is not threadsafe */
@@ -293,7 +294,7 @@ gst_element_register (GstPlugin * plugin, const gchar * name, guint rank,
     GstStaticPadTemplate *newt;
 
     newt = g_new0 (GstStaticPadTemplate, 1);
-    newt->name_template = g_strdup (templ->name_template);
+    newt->name_template = g_intern_string (templ->name_template);
     newt->direction = templ->direction;
     newt->presence = templ->presence;
     newt->static_caps.string = gst_caps_to_string (templ->caps);

gst/gstpadtemplate.h

@@ -151,7 +151,7 @@ struct _GstPadTemplateClass {
  * Structure describing the #GstStaticPadTemplate.
  */
 struct _GstStaticPadTemplate {
-  gchar           *name_template;
+  const gchar     *name_template;
   GstPadDirection  direction;
   GstPadPresence   presence;
   GstStaticCaps    static_caps;
@@ -159,7 +159,7 @@ struct _GstStaticPadTemplate {
 
 /**
  * GST_STATIC_PAD_TEMPLATE:
- * @padname: the name template of pad
+ * @padname: the name template of the pad
  * @dir: the GstPadDirection of the pad
  * @pres: the GstPadPresence of the pad
  * @caps: the GstStaticCaps of the pad

gst/gstregistrybinary.c

@@ -65,6 +65,8 @@
 
 #include <glib/gstdio.h>        /* for g_stat(), g_mapped_file(), ... */
 
+#include "glib-compat-private.h"
+
 
 #define GST_CAT_DEFAULT GST_CAT_REGISTRY
 
@@ -74,6 +76,10 @@
   _outptr = (_element *)_inptr; \
   _inptr += sizeof (_element)
 
+#define unpack_const_string(_inptr, _outptr) \
+  _outptr = g_intern_string ((const gchar *)_inptr); \
+  _inptr += strlen(_outptr) + 1
+
 #define unpack_string(_inptr, _outptr)  \
   _outptr = g_strdup ((gchar *)_inptr); \
   _inptr += strlen(_outptr) + 1
@@ -151,12 +157,12 @@ gst_registry_binary_initialize_magic (GstBinaryRegistryMagic * m)
  * Returns: %TRUE for success
  */
 inline static gboolean
-gst_registry_binary_save_const_string (GList ** list, gchar * str)
+gst_registry_binary_save_const_string (GList ** list, const gchar * str)
 {
   GstBinaryChunk *chunk;
 
   chunk = g_malloc (sizeof (GstBinaryChunk));
-  chunk->data = str;
+  chunk->data = (gpointer) str;
   chunk->size = strlen ((gchar *) chunk->data) + 1;
   chunk->flags = GST_BINARY_REGISTRY_FLAG_CONST;
   chunk->align = FALSE;
@@ -624,7 +630,7 @@ gst_registry_binary_load_pad_template (GstElementFactory * factory, gchar ** in)
   template->direction = pt->direction;
 
   /* unpack pad template strings */
-  unpack_string (*in, template->name_template);
+  unpack_const_string (*in, template->name_template);
   unpack_string (*in, template->static_caps.string);
 
   __gst_element_factory_add_static_pad_template (factory, template);

gst/gstregistryxml.c

@@ -208,7 +208,7 @@ load_pad_template (xmlTextReaderPtr reader)
       GstStaticPadTemplate *template;
 
       template = g_new0 (GstStaticPadTemplate, 1);
-      template->name_template = name;
+      template->name_template = g_intern_string (name);
       template->presence = presence;
       template->direction = direction;
       template->static_caps.string = caps_str;
@@ -585,8 +585,8 @@ gst_registry_xml_read_cache (GstRegistry * registry, const char *location)
  * Save
  */
 static gboolean
-gst_registry_save_escaped (GstRegistry * registry, char *prefix, char *tag,
+gst_registry_save_escaped (GstRegistry * registry, const char *prefix,
-    char *value)
+    const char *tag, const char *value)
 {
   gboolean ret = TRUE;