use unsigned char to avoid MSVC warnings about cast truncations

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47405 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/src/common/base64.cpp b/src/common/base64.cpp
index 89025b0b56f94e568a6ac323023507c19f738166..2fb58c5b29e9d3e12e9b94fc3826caaadd7100e2 100644 (file)
--- a/src/common/base64.cpp
+++ b/src/common/base64.cpp
@@ -88,7 +88,7 @@ wxBase64Decode(void *dst_, size_t dstLen,
         PAD
     };
 
-    static const char decode[256] =
+    static const unsigned char decode[256] =
     {
         WSP,INV,INV,INV,INV,INV,INV,INV,INV,WSP,WSP,INV,WSP,WSP,INV,INV,
         INV,INV,INV,INV,INV,INV,INV,INV,INV,INV,INV,INV,INV,INV,INV,INV,
@@ -118,7 +118,7 @@ wxBase64Decode(void *dst_, size_t dstLen,
     const char *p;
     for ( p = src; srcLen; p++, srcLen-- )
     {
-        const char c = decode[(int)*p];     // cast just to suppress warnings
+        const unsigned char c = decode[(int)*p]; // cast to suppress warnings
         switch ( c )
         {
             case WSP: