From 88d8985a99811f709aafd533975d42d27fe77d2d Mon Sep 17 00:00:00 2001
From: David Turner <david@freetype.org>
Date: Thu, 23 Feb 2006 22:35:26 +0000
Subject: [PATCH]     * src/cache/ftccmap.c: trying to hack binary
 compatibility for     gnustep-back (GNUstep backend module) which still
 crashes under     Sarge.

---
 ChangeLog           |  6 +++-
 src/cache/ftccmap.c | 69 +++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 71 insertions(+), 4 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 195994e40..3cb79f5b4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -6,6 +6,10 @@
 	glyphs.
 	Fix a problem with large encodings.
 
+    * src/cache/ftccmap.c: trying to hack binary compatibility for
+    gnustep-back (GNUstep backend module) which still crashes under
+    Sarge.
+
 2006-02-23  Chia-I Wu  <b90201047@ntu.edu.tw>
 
 	* include/freetype/ftoutln.h (enum FT_Orientation): New value
@@ -44,7 +48,7 @@
 
 	The FT_Get_Module_Flags API was removed consequently.
 
-	* include/freetype/ftmodapi.h (FT_Module_Get_Flags): Removed. 
+	* include/freetype/ftmodapi.h (FT_Module_Get_Flags): Removed.
 	Replaced with...
 	(FT_Get_TrueType_Engine_Type): This.
 	(FT_TrueTypeEngineType): New enumeration.
diff --git a/src/cache/ftccmap.c b/src/cache/ftccmap.c
index 0f7306fcf..71944b812 100644
--- a/src/cache/ftccmap.c
+++ b/src/cache/ftccmap.c
@@ -31,6 +31,42 @@
 #define FT_COMPONENT  trace_cache
 
 
+#ifdef FT_CONFIG_OPTION_OLD_INTERNALS
+
+  typedef enum  FTC_OldCMapType_
+  {
+    FTC_OLD_CMAP_BY_INDEX    = 0,
+    FTC_OLD_CMAP_BY_ENCODING = 1,
+    FTC_OLD_CMAP_BY_ID       = 2
+
+  } FTC_OldCMapType;
+
+
+  typedef struct  FTC_OldCMapIdRec_
+  {
+    FT_UInt  platform;
+    FT_UInt  encoding;
+
+  } FTC_OldCMapIdRec, *FTC_OldCMapId;
+
+
+  typedef struct  FTC_OldCMapDescRec_
+  {
+    FTC_FaceID       face_id;
+    FTC_OldCMapType  type;
+
+    union
+    {
+      FT_UInt           index;
+      FT_Encoding       encoding;
+      FTC_OldCMapIdRec  id;
+
+    } u;
+
+  } FTC_OldCMapDescRec, *FTC_OldCMapDesc;
+
+#endif /* FT_CONFIG_OLD_INTERNALS */
+
   /*************************************************************************/
   /*                                                                       */
   /* Each FTC_CMapNode contains a simple array to map a range of character */
@@ -261,9 +297,36 @@
       return 0;
     }
 
-    query.face_id    = face_id;
-    query.cmap_index = (FT_UInt)cmap_index;
-    query.char_code  = char_code;
+#ifdef FT_CONFIG_OPTION_OLD_INTERNALS
+   /* detect a call from a rogue client that thinks it is linking
+    * to FreeType 2.1.7. This is possible because the third parameter
+    * is then a character code, and we've never seen any font with
+    * more than a few charmaps, so if the index is very large...
+    */
+    if ( cmap_index >= 4 )
+    {
+      FTC_OldCMapDesc  desc = (FTC_OldCMapDesc) face_id;
+
+      query.face_id = desc->face_id;
+
+      switch ( desc->type )
+      {
+        case FTC_OLD_CMAP_BY_INDEX:
+          query.cmap_index = desc->u.index;
+          query.char_code  = (FT_UInt32)cmap_index;
+          break;
+
+        default:
+          return FT_Err_Unimplemented_Feature;
+      }
+    }
+    else
+#endif /* FT_CONFIG_OPTION_OLD_INTERNALS */
+    {
+      query.face_id    = face_id;
+      query.cmap_index = (FT_UInt)cmap_index;
+      query.char_code  = char_code;
+    }
 
     hash = FTC_CMAP_HASH( face_id, cmap_index, char_code );