From 29759b7141291c58b30b9f5b0c057e10b7351371 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fran=C3=A7ois=20Cartegnie?= <fcvlcdev@free.fr>
Date: Sun, 25 Feb 2024 16:46:35 +0100
Subject: [PATCH] codec: ttml: add namespaces registry

---
 modules/codec/ttml/ttml.c | 86 +++++++++++++++++++++++++++++++++++++++
 modules/codec/ttml/ttml.h | 15 +++++++
 2 files changed, 101 insertions(+)

diff --git a/modules/codec/ttml/ttml.c b/modules/codec/ttml/ttml.c
index f60a72a161..242ba8f666 100644
--- a/modules/codec/ttml/ttml.c
+++ b/modules/codec/ttml/ttml.c
@@ -65,6 +65,92 @@ vlc_module_begin ()
 #endif
 vlc_module_end ()
 
+struct tt_namespace_s
+{
+    char *psz_prefix;
+    char *psz_uri;
+    struct vlc_list links;
+};
+
+void tt_namespaces_Clean( tt_namespaces_t *nss )
+{
+    struct tt_namespace_s *ns;
+    vlc_list_foreach( ns, &nss->nodes, links )
+    {
+        free( ns->psz_prefix );
+        free( ns->psz_uri );
+        free( ns );
+    }
+}
+
+void tt_namespaces_Init( tt_namespaces_t *nss )
+{
+    vlc_list_init( &nss->nodes );
+}
+
+const char * tt_namespaces_GetURI( const tt_namespaces_t *nss,
+                                   const char *psz_qn )
+{
+    const struct tt_namespace_s *ns;
+    vlc_list_foreach_const( ns, &nss->nodes, links )
+    {
+        /* compares prefixed name against raw prefix */
+        for( size_t i=0; ; i++ )
+        {
+            if( ns->psz_prefix[i] == psz_qn[i] )
+            {
+                if( psz_qn[i] == '\0' )
+                    return ns->psz_uri;
+            }
+            else
+            {
+                if( ns->psz_prefix[i] == '\0' && psz_qn[i] == ':' )
+                    return ns->psz_uri;
+                else
+                    break;
+            }
+        }
+    }
+    return NULL;
+}
+
+const char * tt_namespaces_GetPrefix( const tt_namespaces_t *nss,
+                                      const char *psz_uri )
+{
+    const struct tt_namespace_s *ns;
+    vlc_list_foreach_const( ns, &nss->nodes, links )
+    {
+        if( !strcmp( ns->psz_uri, psz_uri ) )
+            return ns->psz_prefix;
+    }
+    return NULL;
+}
+
+void tt_namespaces_Register( tt_namespaces_t *nss, const char *psz_prefix,
+                             const char *psz_uri )
+{
+    if( tt_namespaces_GetPrefix( nss, psz_uri ) )
+        return;
+    struct tt_namespace_s *ns = malloc(sizeof(*ns));
+    if( ns )
+    {
+        const char *sep = strchr( psz_prefix, ':' );
+        if( sep )
+            ns->psz_prefix = strndup( psz_prefix, sep - psz_prefix );
+        else
+            ns->psz_prefix = strdup("");
+        ns->psz_uri = strdup( psz_uri );
+        if( !ns->psz_prefix || !ns->psz_uri )
+        {
+            free( ns->psz_prefix );
+            free( ns->psz_uri );
+            free( ns );
+            return;
+        }
+        vlc_list_append( &ns->links, &nss->nodes );
+    }
+}
+
 static const char * tt_node_InheritNS( const tt_node_t *p_node )
 {
     for( ; p_node ; p_node = p_node->p_parent )
diff --git a/modules/codec/ttml/ttml.h b/modules/codec/ttml/ttml.h
index 4459986145..03412dfd9f 100644
--- a/modules/codec/ttml/ttml.h
+++ b/modules/codec/ttml/ttml.h
@@ -21,6 +21,7 @@
 #include <vlc_tick.h>
 #include <vlc_arrays.h>
 #include <vlc_memstream.h>
+#include <vlc_list.h>
 
 int tt_OpenDemux( vlc_object_t* p_this );
 void tt_CloseDemux( vlc_object_t* p_demux );
@@ -68,6 +69,20 @@ struct tt_searchkey
 #define TT_NS_FEATURE     TT_NS "/feature/"
 #define TT_NS_EXTENSION   TT_NS "/extension/"
 
+typedef struct
+{
+    struct vlc_list nodes;
+} tt_namespaces_t;
+
+void tt_namespaces_Init( tt_namespaces_t *nss );
+void tt_namespaces_Clean( tt_namespaces_t *nss );
+void tt_namespaces_Register( tt_namespaces_t *nss, const char *psz_prefix,
+                             const char *psz_uri );
+const char * tt_namespaces_GetURI( const tt_namespaces_t *nss,
+                                   const char *psz_qn ); /* qn or prefix */
+const char * tt_namespaces_GetPrefix( const tt_namespaces_t *nss,
+                                      const char *psz_uri );
+
 enum
 {
     TT_NODE_TYPE_ELEMENT,