--- xmlrpc-c-1.32.5/src/cpp/base64.cpp~	2010-05-21 00:52:29.000000000 +0200
+++ xmlrpc-c-1.32.5/src/cpp/base64.cpp	2016-02-16 08:37:43.874552656 +0100
@@ -15,14 +15,14 @@
 namespace {
 
 char const table_a2b_base64[] = {
-    -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
-    -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
-    -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
-    52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1, 0,-1,-1, /* Note PAD->0 */
-    -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,-1, -1,-1,-1,-1
+    64,64,64,64, 64,64,64,64, 64,64,64,64, 64,64,64,64,
+    64,64,64,64, 64,64,64,64, 64,64,64,64, 64,64,64,64,
+    64,64,64,64, 64,64,64,64, 64,64,64,62, 64,64,64,63,
+    52,53,54,55, 56,57,58,59, 60,61,64,64, 64, 0,64,64, /* Note PAD->0 */
+    64, 0, 1, 2,  3, 4, 5, 6,  7, 8, 9,10, 11,12,13,14,
+    15,16,17,18, 19,20,21,22, 23,24,25,64, 64,64,64,64,
+    64,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
+    41,42,43,44, 45,46,47,48, 49,50,51,64, 64,64,64,64
 };
 
 char const base64Pad('=');
@@ -210,7 +210,7 @@
                 buffer.discardResidue();
             } else {
                 unsigned int const tableIndex(thisChar);
-                if (table_a2b_base64[tableIndex] == -1)
+                if (table_a2b_base64[tableIndex] == 64)
                     throwf("Contains non-base64 character "
                            "with ASCII code 0x%02x", thisChar);