c++ base64 RAII

base64.cpp

#include <openssl/bio.h>
#include <openssl/buffer.h>
#include <openssl/evp.h>

using RawData = std::vector<uint8_t>;

RawData encode(const RawData& input) {
	BIO* b64 = BIO_new(BIO_f_base64());
	BIO* bio = BIO_new(BIO_s_mem());
	bio = BIO_push(b64, bio);

	BIO_set_flags(bio, BIO_FLAGS_BASE64_NO_NL);
	BIO_write(bio, input.data(), input.size());
	BIO_flush(bio);

	BUF_MEM* buf;
	BIO_get_mem_ptr(bio, &buf);

	RawData output(buf->length);
	std::copy(buf->data, buf->data + buf->length, output.begin());

	BIO_set_close(bio, BIO_NOCLOSE);
	BIO_free_all(bio);

	return output;
}