[glib] GVariantTypeInfo changes

[Ryan Lortie <ryanl src gnome org>]

commit 0ac2277b490dae967b7a5083966610cffe8582e1
Author: Ryan Lortie <desrt desrt ca>
Date:   Tue Feb 2 23:38:20 2010 -0500

    GVariantTypeInfo changes
    
     - rename 'type' in MemberInfo to 'type_info'
     - add 'ending_type' field to MemberInfo
     - document how to find the ending

 glib/gvarianttypeinfo.c   |   23 ++++++++++++++++-------
 glib/gvarianttypeinfo.h   |   21 ++++++++++++++++++++-
 glib/tests/gvarianttype.c |    6 +++---
 3 files changed, 39 insertions(+), 11 deletions(-)
---
diff --git a/glib/gvarianttypeinfo.c b/glib/gvarianttypeinfo.c
index 08439c9..1e476e4 100644
--- a/glib/gvarianttypeinfo.c
+++ b/glib/gvarianttypeinfo.c
@@ -336,7 +336,7 @@ tuple_info_free (GVariantTypeInfo *info)
   tuple_info = (TupleInfo *) info;
 
   for (i = 0; i < tuple_info->n_members; i++)
-    g_variant_type_info_unref (tuple_info->members[i].type);
+    g_variant_type_info_unref (tuple_info->members[i].type_info);
 
   g_slice_free1 (sizeof (GVariantMemberInfo) * tuple_info->n_members,
                  tuple_info->members);
@@ -357,8 +357,17 @@ tuple_allocate_members (const GVariantType  *type,
   item_type = g_variant_type_first (type);
   while (item_type)
     {
-      (*members)[i++].type = g_variant_type_info_get (item_type);
+      GVariantMemberInfo *member = &(*members)[i++];
+
+      member->type_info = g_variant_type_info_get (item_type);
       item_type = g_variant_type_next (item_type);
+
+      if (item_type == NULL)
+        member->ending_type = G_VARIANT_MEMBER_ENDING_LAST;
+      else if (member->type_info->fixed_size)
+        member->ending_type = G_VARIANT_MEMBER_ENDING_FIXED;
+      else
+        member->ending_type = G_VARIANT_MEMBER_ENDING_OFFSET;
     }
 
   g_assert (i == *n_members);
@@ -377,8 +386,8 @@ tuple_get_item (TupleInfo          *info,
   if (&info->members[info->n_members] == item)
     return FALSE;
 
-  *d = item->type->alignment;
-  *e = item->type->fixed_size;
+  *d = item->type_info->alignment;
+  *e = item->type_info->fixed_size;
   return TRUE;
 }
 
@@ -591,7 +600,7 @@ tuple_set_base_info (TupleInfo *info)
         /* can find the max of a list of "one less than" powers of two
          * by 'or'ing them
          */
-        base->alignment |= m->type->alignment;
+        base->alignment |= m->type_info->alignment;
 
       m--; /* take 'm' back to the last item */
 
@@ -599,7 +608,7 @@ tuple_set_base_info (TupleInfo *info)
        * offsets are stored and the last item is fixed-sized too (since
        * an offset is never stored for the last item).
        */
-      if (m->i == -1 && m->type->fixed_size)
+      if (m->i == -1 && m->type_info->fixed_size)
         /* in that case, the fixed size can be found by finding the
          * start of the last item (in the usual way) and adding its
          * fixed size.
@@ -609,7 +618,7 @@ tuple_set_base_info (TupleInfo *info)
          * easier) so we round up to that here.
          */
         base->fixed_size =
-          tuple_align (((m->a & m->b) | m->c) + m->type->fixed_size,
+          tuple_align (((m->a & m->b) | m->c) + m->type_info->fixed_size,
                        base->alignment);
       else
         /* else, the tuple is not fixed size */
diff --git a/glib/gvarianttypeinfo.h b/glib/gvarianttypeinfo.h
index c77cb20..25a645b 100644
--- a/glib/gvarianttypeinfo.h
+++ b/glib/gvarianttypeinfo.h
@@ -95,16 +95,35 @@ typedef struct _GVariantTypeInfo GVariantTypeInfo;
  *
  * For details about how 'a', 'b' and 'c' are calculated, see the
  * comments at the point of the implementation in gvariantypeinfo.c.
+ *
+ * The end address of the item is then determined in one of three ways,
+ * according to the 'end_type' field.
+ *
+ *   - FIXED: For fixed sized items, the end address is equal to the
+ *     start address plus the fixed size.
+ *
+ *   - LAST: For the last variable sized item in the tuple, the end
+ *     address is equal to the end address of the tuple, minus the size
+ *     of the offset array.
+ *
+ *   - OFFSET: For other variable sized items, the next index past 'i'
+ *     (ie: 'i + 1') must be consulted to find the end of this item.
  */
 
 typedef struct
 {
-  GVariantTypeInfo *type;
+  GVariantTypeInfo *type_info;
 
   gsize i, a;
   gint8 b, c;
+
+  guint8 ending_type;
 } GVariantMemberInfo;
 
+#define G_VARIANT_MEMBER_ENDING_FIXED   0
+#define G_VARIANT_MEMBER_ENDING_LAST    1
+#define G_VARIANT_MEMBER_ENDING_OFFSET  2
+
 /* query */
 G_GNUC_INTERNAL
 const gchar *                   g_variant_type_info_get_type_string     (GVariantTypeInfo   *typeinfo);
diff --git a/glib/tests/gvarianttype.c b/glib/tests/gvarianttype.c
index 26c237f..343d873 100644
--- a/glib/tests/gvarianttype.c
+++ b/glib/tests/gvarianttype.c
@@ -826,7 +826,7 @@ describe_info (GVariantTypeInfo *info)
             sep = ", ";
 
             minfo = g_variant_type_info_member_info (info, i);
-            subtype = describe_info (minfo->type);
+            subtype = describe_info (minfo->type_info);
             g_string_append (string, subtype);
             g_free (subtype);
           }
@@ -845,8 +845,8 @@ describe_info (GVariantTypeInfo *info)
         g_assert_cmpint (g_variant_type_info_n_members (info), ==, 2);
         keyinfo = g_variant_type_info_member_info (info, 0);
         valueinfo = g_variant_type_info_member_info (info, 1);
-        key = describe_info (keyinfo->type);
-        value = describe_info (valueinfo->type);
+        key = describe_info (keyinfo->type_info);
+        value = describe_info (valueinfo->type_info);
         result = g_strjoin ("", "e of [", key, ", ", value, "]", NULL);
         g_free (key);
         g_free (value);