Aric Stewart : usp10: Properly handle fonts with scripts without a default language.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 6c43ef46d85bb37de5ce65a8ae6634e891e5cb07
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=6c43ef46d85bb37de5ce65a8ae...

Author: Aric Stewart <aric(a)codeweavers.com>
Date:   Mon Jun 11 07:15:11 2012 -0500

usp10: Properly handle fonts with scripts without a default language.

---

 dlls/usp10/opentype.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/dlls/usp10/opentype.c b/dlls/usp10/opentype.c
index 74046fd..1a5d3e4 100644
--- a/dlls/usp10/opentype.c
+++ b/dlls/usp10/opentype.c
@@ -924,10 +924,15 @@ static void GSUB_initialize_language_cache(LoadedScript *script)
 
     if (!script->language_count)
     {
+        DWORD offset;
         const GSUB_Script* table = script->table;
         script->language_count = GET_BE_WORD(table->LangSysCount);
-        script->default_language.tag = MS_MAKE_TAG('d','f','l','t');
-        script->default_language.table = (const BYTE*)table + GET_BE_WORD(table->DefaultLangSys);
+        offset = GET_BE_WORD(table->DefaultLangSys);
+        if (offset)
+        {
+            script->default_language.tag = MS_MAKE_TAG('d','f','l','t');
+            script->default_language.table = (const BYTE*)table + offset;
+        }
 
         if (script->language_count)
         {