Added undefined behavior sanitizer.

Combined common sanitizer flags.
Added fuzzers.

fuzzing/fuzz-ByteStreamToBase64.cc

@@ -0,0 +1,32 @@
+
+
+#include <stdint.h>
+#include <stddef.h>
+
+#include <Base.h>
+
+#include "fuzzing.h"
+
+
+bool
+fuzzing_testinput(const uint8_t * data, size_t size)
+{
+	size_t outlen;
+	char * out;
+
+
+	if(size < (2 + 1))
+		return true;
+
+	outlen = (data[0] << 8) | data[1];
+	outlen++;
+
+	data += 2;
+	size -= 2;
+
+	out = new char[outlen];
+	i2p::data::ByteStreamToBase64(data, size, out, outlen);
+	delete [] out;
+
+	return true;
+}