Move base64simd into a 3rdparty folder

3rdparty/base64/lib/codecs.h

@@ -0,0 +1,65 @@
+#include <stdint.h>
+#include <stddef.h>
+
+#include "../include/libbase64.h"
+#include "config.h"
+
+// Function parameters for encoding functions:
+#define BASE64_ENC_PARAMS			\
+	( struct base64_state	*state		\
+	, const char		*src		\
+	, size_t		 srclen		\
+	, char			*out		\
+	, size_t		*outlen		\
+	)
+
+// Function parameters for decoding functions:
+#define BASE64_DEC_PARAMS			\
+	( struct base64_state	*state		\
+	, const char		*src		\
+	, size_t		 srclen		\
+	, char			*out		\
+	, size_t		*outlen		\
+	)
+
+// Function signature for encoding functions:
+#define BASE64_ENC_FUNCTION(arch)		\
+	void					\
+	base64_stream_encode_ ## arch		\
+	BASE64_ENC_PARAMS
+
+// Function signature for decoding functions:
+#define BASE64_DEC_FUNCTION(arch)		\
+	int					\
+	base64_stream_decode_ ## arch		\
+	BASE64_DEC_PARAMS
+
+// Cast away unused variable, silence compiler:
+#define UNUSED(x)		((void)(x))
+
+// Stub function when encoder arch unsupported:
+#define BASE64_ENC_STUB				\
+	UNUSED(state);				\
+	UNUSED(src);				\
+	UNUSED(srclen);				\
+	UNUSED(out);				\
+						\
+	*outlen = 0;
+
+// Stub function when decoder arch unsupported:
+#define BASE64_DEC_STUB				\
+	UNUSED(state);				\
+	UNUSED(src);				\
+	UNUSED(srclen);				\
+	UNUSED(out);				\
+	UNUSED(outlen);				\
+						\
+	return -1;
+
+struct codec
+{
+	void (* enc) BASE64_ENC_PARAMS;
+	int  (* dec) BASE64_DEC_PARAMS;
+};
+
+extern void codec_choose (struct codec *, int flags);