(* Copyright (C)2018-2023, Philip Munts dba Munts Technologies.                *)
(*                                                                             *)
(* Redistribution and use in source and binary forms, with or without          *)
(* modification, are permitted provided that the following conditions are met: *)
(*                                                                             *)
(* * Redistributions of source code must retain the above copyright notice,    *)
(*   this list of conditions and the following disclaimer.                     *)
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(* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" *)
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(* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN     *)
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(* POSSIBILITY OF SUCH DAMAGE.                                                 *)

DEFINITION MODULE FOR "C" libipv4;

  FROM SYSTEM IMPORT BYTE;

  EXPORT UNQUALIFIED
    INADDR_ANY,
    INADDR_LOOPBACK,
    INADDR_BROADCAST,
    MSG_DONTROUTE,
    MSG_DONTWAIT,
    MSG_MORE,
    IPV4_resolve,
    IPV4_ntoa,
    TCP4_connect,
    TCP4_accept,
    TCP4_server,
    TCP4_close,
    TCP4_send,
    TCP4_receive,
    UDP4_open,
    UDP4_close,
    UDP4_send,
    UDP4_receive;

  CONST
    INADDR_ANY       = 000000000H;
    INADDR_LOOPBACK  = 07F000001H;
    INADDR_BROADCAST = 0FFFFFFFFH;

  (* Flags for UDP send and receive *)

    MSG_DONTROUTE    = 0004H;
    MSG_DONTWAIT     = 0040H;
    MSG_MORE         = 8000H;

  (* Resolve host name to 32-bit IPv4 address *)

  PROCEDURE IPV4_resolve
   (name      : ARRAY OF CHAR;
    VAR addr  : CARDINAL;
    VAR error : CARDINAL);

  (* Convert 32-bit IPv4 address to dotted decimal string *)

  PROCEDURE IPV4_ntoa
   (addr      : CARDINAL;
    VAR dst   : ARRAY OF CHAR;
    dstsize   : CARDINAL;
    VAR error : CARDINAL);

  (* Connect to a TCP server *)

  PROCEDURE TCP4_connect
   (addr      : CARDINAL;
    port      : CARDINAL;
    VAR fd    : INTEGER;
    VAR error : CARDINAL);

  (* Wait (block) for exactly one connection from a TCP client, then *)
  (* return a file descriptor for the new connection                 *)

  PROCEDURE TCP4_accept
   (addr      : CARDINAL;
    port      : CARDINAL;
    VAR fd    : INTEGER;
    VAR error : CARDINAL);

  (* Wait (block) until a client connects, then fork and return a file *)
  (* descriptor for the new connection to the child process            *)

  PROCEDURE TCP4_server
   (addr      : CARDINAL;
    port      : CARDINAL;
    VAR fd    : INTEGER;
    VAR error : CARDINAL);

  (* Close a TCP connection *)

  PROCEDURE TCP4_close
   (fd        : INTEGER;
    VAR error : CARDINAL);

  (* Send data over TCP connection *)

  PROCEDURE TCP4_send
   (fd        : INTEGER;
    buf       : ARRAY OF BYTE;
    bufsize   : CARDINAL;
    VAR count : CARDINAL;
    VAR error : CARDINAL);

  (* Receive data over TCP connection *)

  PROCEDURE TCP4_receive
   (fd        : INTEGER;
    VAR buf   : ARRAY OF BYTE;
    bufsize   : CARDINAL;
    VAR count : CARDINAL;
    VAR error : CARDINAL);

  (* Open a UDP socket *)

  PROCEDURE UDP4_open
   (addr      : CARDINAL;        (* My IPv4 address *)
    port      : CARDINAL;        (* My UDP port *)
    VAR fd    : INTEGER;
    VAR error : CARDINAL);

  (* Close a UDP socket *)

  PROCEDURE UDP4_close
   (fd        : INTEGER;
    VAR error : CARDINAL);

  (* Send a UDP datagram *)

  PROCEDURE UDP4_send
   (fd        : INTEGER;
    addr      : CARDINAL;        (* Destination IPv4 address *)
    port      : CARDINAL;        (* Destination UDP port *)
    buf       : ARRAY OF BYTE;
    bufsize   : CARDINAL;
    flags     : CARDINAL;
    VAR count : CARDINAL;
    VAR error : CARDINAL);

  (* Receive a UDP datagram *)

  PROCEDURE UDP4_receive
   (fd        : INTEGER;
    VAR addr  : CARDINAL;        (* Source IPv4 address *)
    VAR port  : CARDINAL;        (* Source UDP port *)
    VAR buf   : ARRAY OF BYTE;
    bufsize   : CARDINAL;
    flags     : CARDINAL;
    VAR count : CARDINAL;
    VAR error : CARDINAL);

END libipv4.