/**
 * Telnet middleware that handles characters read by console and acts on telnet escapes,
 * removing them from the stream
 * 
 * Created on 2019/02/17.
 */

#ifndef CSPEMU_TELNET_PARSER_H
#define CSPEMU_TELNET_PARSER_H

#include <console/cmddef.h>

/**
 * Process a buffer of received characters, handling and removing telnet codes.
 * The buffer is modified in place and the number of data characters is returned.
 *
 * @param[in,out] buffer - buffer to process
 * @param len - original number of characters in the buffer
 * @return - number of characters left in the buffer, to be passed to the console handler
 */
size_t telnet_middleware_read(console_ctx_t *cctx, uint8_t *buffer, size_t len);

enum telnet_option {
    OPT_BINARY = 0,
    OPT_ECHO = 1,
    OPT_SUPPRESS_GO_AHEAD = 3,
    OPT_STATUS = 5,
    OPT_TIMING_MARK = 6,
    OPT_TERMINAL_TYPE = 24,
    OPT_END_OF_RECORD = 25,
    OPT_NEGOTIATE_WINDOW_SIZE = 31,
    OPT_NEGOTIATE_TERMINAL_SPEED = 32,
    OPT_REMOTE_FLOW_CONTROL = 33,
//    OPT_COMPORT_OPTION = 34, - according to RFC, but seems replaced by...
    OPT_LINEMODE = 34,
    OPT_X_DISPLAY_LOCATION = 35,
    OPT_NEW_ENVIRON = 39,
    OPT_EXOPL = 255,
};

void telnet_send_subnegotiate(console_ctx_t *cctx, enum telnet_option opt, const uint8_t *data, size_t len);
void telnet_send_will(console_ctx_t *cctx, enum telnet_option opt);
void telnet_send_wont(console_ctx_t *cctx, enum telnet_option opt);
void telnet_send_do(console_ctx_t *cctx, enum telnet_option opt);
void telnet_send_dont(console_ctx_t *cctx, enum telnet_option opt);

#endif //CSPEMU_TELNET_PARSER_H