--- src/osgDB/ConvertBase64.cpp.orig	2019-10-09 09:44:59 UTC

+++ src/osgDB/ConvertBase64.cpp

@@ -28,7 +28,7 @@ namespace osgDB

     int base64_decode_value(char value_in)

     {

-        static const char decoding[] = {62,-1,-1,-1,63,52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-2,-1,-1,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51};

+        static const signed char decoding[] = {62,-1,-1,-1,63,52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-2,-1,-1,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51};

         static const char decoding_size = sizeof(decoding);

         value_in -= 43;

         if (value_in < 0 || value_in > decoding_size) return -1;

--- src/osgPlugins/osgjs/Base64.orig	2019-10-09 12:55:34 UTC

+++ src/osgPlugins/osgjs/Base64

@@ -61,7 +61,7 @@ namespace base64

   extern const char* to_table;

   extern const char* to_table_end;

-  extern const char* from_table;

+  extern const signed char* from_table;

   template <class InputIterator, class OutputIterator>

--- src/osgPlugins/osgjs/Base64.cpp.orig	2019-10-09 12:52:54 UTC

+++ src/osgPlugins/osgjs/Base64.cpp

@@ -18,7 +18,7 @@ namespace base64

   const char* to_table_end =

     _to_table + sizeof(_to_table);

-  const char _from_table[128] =

+  const signed char _from_table[128] =

   {

     -1, -1, -1, -1, -1, -1, -1, -1, // 0

     -1, -1, -1, -1, -1, -1, -1, -1, // 8

@@ -37,6 +37,6 @@ namespace base64

     41, 42, 43, 44, 45, 46, 47, 48, // 112

     49, 50, 51, -1, -1, -1, -1, -1  // 120

   };

-  const char* from_table = _from_table;

+  const signed char* from_table = _from_table;

 }