Fix base64 alphabet

fix #500

CHANGELOG.md

@@ -1,6 +1,7 @@
 Version 59:
 
 * Integrated Beast INTERFACE (cmake)
+* Fix base64 alphabet
 
 API Changes:
 

include/beast/core/detail/base64.hpp

@@ -66,7 +66,7 @@ get_inverse()
          -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, //  16-31
          -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, //  32-47
          52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, //  48-63
-         -1, -1,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, //  64-79
+         -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, //  64-79
          15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, //  80-95
          -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, //  96-111
          41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1, // 112-127

test/core/base64.cpp

@@ -34,6 +34,19 @@ public:
         check ("foob",   "Zm9vYg==");
         check ("fooba",  "Zm9vYmE=");
         check ("foobar", "Zm9vYmFy");
+
+        check(
+            "Man is distinguished, not only by his reason, but by this singular passion from "
+            "other animals, which is a lust of the mind, that by a perseverance of delight "
+            "in the continued and indefatigable generation of knowledge, exceeds the short "
+            "vehemence of any carnal pleasure."
+            ,
+            "TWFuIGlzIGRpc3Rpbmd1aXNoZWQsIG5vdCBvbmx5IGJ5IGhpcyByZWFzb24sIGJ1dCBieSB0aGlz"
+            "IHNpbmd1bGFyIHBhc3Npb24gZnJvbSBvdGhlciBhbmltYWxzLCB3aGljaCBpcyBhIGx1c3Qgb2Yg"
+            "dGhlIG1pbmQsIHRoYXQgYnkgYSBwZXJzZXZlcmFuY2Ugb2YgZGVsaWdodCBpbiB0aGUgY29udGlu"
+            "dWVkIGFuZCBpbmRlZmF0aWdhYmxlIGdlbmVyYXRpb24gb2Yga25vd2xlZGdlLCBleGNlZWRzIHRo"
+            "ZSBzaG9ydCB2ZWhlbWVuY2Ugb2YgYW55IGNhcm5hbCBwbGVhc3VyZS4="
+            );
     }
 };