mongoose/docs/c-api/mg_util.h/mg_base64_encode.md

title	decl_name	symbol_kind	signature
mg_base64_encode()	mg_base64_encode	func	void mg_base64_encode(const unsigned char *src, int src_len, char *dst);

Base64-encode chunk of memory src, src_len into the destination dst. Destination has to have enough space to hold encoded buffer. Destination is '\0'-terminated.