pangowin32: Clear cmap on finalize

Implement copy method for format_4_cmap and format_12_cmap, and
free don't leak the struct.

1 files changed, 59 insertions, 0 deletions

diff --git a/pango/pangowin32.c b/pango/pangowin32.c
index 12b4a36e..f8fedcb3 100644
--- a/pango/pangowin32.c
+++ b/pango/pangowin32.c
@@ -1272,3 +1272,62 @@ pango_win32_font_create_hb_font (PangoFont *font)
 
   return hb_font;
 }
+
+gpointer
+_pango_win32_copy_cmap (gpointer cmap, guint16 cmap_format)
+{
+  if (!cmap)
+    return NULL;
+
+  if (cmap_format == 12)
+    {
+      struct format_12_cmap *new_table;
+      struct format_12_cmap *old_table;
+      guint32 *tbl, *tbl_end;
+
+      old_table = (struct format_12_cmap *) cmap;
+
+      new_table = g_malloc (old_table->length);
+      memcpy (old_table, new_table, sizeof (struct format_12_cmap));
+
+      tbl_end = (guint32 *) ((char *) new_table + new_table->length);
+      tbl = new_table->groups;
+
+      while (tbl < tbl_end)
+        {
+          *tbl = GUINT32_FROM_BE (*tbl);
+          tbl++;
+        }
+
+      return new_table;
+    }
+  else if (cmap_format == 4)
+    {
+      struct format_4_cmap *new_table;
+      struct format_4_cmap *old_table;
+      guint16 *tbl, *tbl_end;
+
+      old_table = (struct format_4_cmap *) cmap;
+
+      new_table = g_malloc (old_table->length);
+      memcpy (old_table, new_table, sizeof (struct format_4_cmap));
+
+      tbl_end = (guint16 *)((char *) new_table + new_table->length);
+      tbl = &new_table->reserved;
+
+      while (tbl < tbl_end)
+        {
+          *tbl = GUINT16_FROM_BE (*tbl);
+          tbl++;
+        }
+
+      return new_table;
+    }
+  else
+    {
+      /* got non-null cmap but unknown format, it shouldn't happen */
+      g_assert_not_reached ();
+    }
+
+  return NULL;
+}