int rc4_send_bin_buffer(struct rc4_context *rc4c, const char *buf, size_t len);
int rc4_send_buffer(struct rc4_context *rc4c, const char *buf);
__printf_2_3 int rc4_send_va_buffer(struct rc4_context *rc4c, const char *fmt, ...);
int rc4_send_bin_buffer(struct rc4_context *rc4c, const char *buf, size_t len);
int rc4_send_buffer(struct rc4_context *rc4c, const char *buf);
__printf_2_3 int rc4_send_va_buffer(struct rc4_context *rc4c, const char *fmt, ...);