Add wxBase64Decode(void*,size_t,wxString) overload.

We had wxBase64Decode(void*,size_t,const char*,size_t) as well as
wxBase64Decode(const char*,size_t) and wxBase64Decode(wxString) already but
not a version taking the buffer and wxString, complete the set of overloads
now.

This allows the unit test to compile in STL build (where there is no implicit
conversion from wxString to const char *).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62614 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/base64.h

@@ -89,6 +89,17 @@ wxBase64Decode(void *dst, size_t dstLen,
                wxBase64DecodeMode mode = wxBase64DecodeMode_Strict,
                size_t *posErr = NULL);
 
+inline size_t
+wxBase64Decode(void *dst, size_t dstLen,
+               const wxString& src,
+               wxBase64DecodeMode mode = wxBase64DecodeMode_Strict,
+               size_t *posErr = NULL)
+{
+    // don't use str.length() here as the ASCII buffer is shorter than it for
+    // strings with embedded NULs
+    return wxBase64Decode(dst, dstLen, src.ToAscii(), wxNO_LEN, mode, posErr);
+}
+
 // decode the contents of the given string; the returned buffer is empty if an
 // error occurs during decoding
 WXDLLIMPEXP_BASE wxMemoryBuffer