--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/base64.h	Tue Jun 08 08:40:01 2021 +0200
@@ -0,0 +1,53 @@
+/*
+ * base64.h -- base64 encoding and decoding
+ *
+ * Copyright (c) 2013-2021 David Demelier <markand@malikania.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef BASE64_H
+#define BASE64_H
+
+#include <stddef.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+#define B64_ENCODE_LENGTH(x) (4 * ((x) / 3 + 1))
+#define B64_DECODE_LENGTH(x) (3 * ((x) / 4))
+
+int
+b64_isbase64(unsigned char ch);
+
+int
+b64_isvalid(unsigned char ch);
+
+unsigned char
+b64_lookup(unsigned char value);
+
+unsigned char
+b64_rlookup(unsigned char ch);
+
+size_t
+b64_encode(const char *src, size_t srcsz, char *dst, size_t dstsz);
+
+size_t
+b64_decode(const char *src, size_t srcsz, char *dst, size_t dstsz);
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* !BASE64_H */