cache: Check 32-bit glyph index on 16-bit systems.

ChangeLog

@@ -1,3 +1,11 @@
+2009-07-31  suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
+
+	cache: Check 32-bit glyph index on 16-bit systems.
+
+	* src/cache/ftcbasic.c (ftc_basic_family_get_count):
+	Check overflow caused by the face including large
+	number of glyphs > 64k.
+
 2009-07-31  suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
 
 	cache: Fix some data types mismatching with their sources.

src/cache/ftcbasic.c

@@ -25,6 +25,8 @@
 #include "ftccback.h"
 #include "ftcerror.h"
 
+#define FT_COMPONENT  trace_cache
+
 
 #ifdef FT_CONFIG_OPTION_OLD_INTERNALS
 
@@ -139,8 +141,15 @@
 
     error = FTC_Manager_LookupFace( manager, family->attrs.scaler.face_id,
                                     &face );
+
+    if ( (FT_ULong)face->num_glyphs > FT_UINT_MAX || 0 > face->num_glyphs )
+    {
+      FT_TRACE1(( "ftc_basic_family_get_count: too large number of glyphs " ));
+      FT_TRACE1(( "in this face, truncated\n", face->num_glyphs ));
+    }
+
     if ( !error )
-      result = face->num_glyphs;
+      result = (FT_UInt)face->num_glyphs;
 
     return result;
   }