text: /**
   * @file
   * netbuf API (for netconn API)
   */
  
  /*
   * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without modification,
   * are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice,
   *    this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   * 3. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
   * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
   * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
   * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
   * OF SUCH DAMAGE.
   *
   * This file is part of the lwIP TCP/IP stack.
   *
   * Author: Adam Dunkels <adam@sics.se>
   *
   */
  #ifndef LWIP_HDR_NETBUF_H
  #define LWIP_HDR_NETBUF_H
  
  #include "ingenialink/ecat/lwip/opt.h"
  
  #if LWIP_NETCONN || LWIP_SOCKET /* don't build if not configured for use in lwipopts.h */
  /* Note: Netconn API is always available when sockets are enabled -
   * sockets are implemented on top of them */
  
  #include "ingenialink/ecat/lwip/pbuf.h"
  #include "ingenialink/ecat/lwip/ip_addr.h"
  #include "ingenialink/ecat/lwip/ip6_addr.h"
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /** This netbuf has dest-addr/port set */
  #define NETBUF_FLAG_DESTADDR    0x01
  /** This netbuf includes a checksum */
  #define NETBUF_FLAG_CHKSUM      0x02
  
  /** "Network buffer" - contains data and addressing info */
  struct netbuf {
    struct pbuf *p, *ptr;
    ip_addr_t addr;
    u16_t port;
  #if LWIP_NETBUF_RECVINFO || LWIP_CHECKSUM_ON_COPY
  #if LWIP_CHECKSUM_ON_COPY
    u8_t flags;
  #endif /* LWIP_CHECKSUM_ON_COPY */
    u16_t toport_chksum;
  #if LWIP_NETBUF_RECVINFO
    ip_addr_t toaddr;
  #endif /* LWIP_NETBUF_RECVINFO */
  #endif /* LWIP_NETBUF_RECVINFO || LWIP_CHECKSUM_ON_COPY */
  };
  
  /* Network buffer functions: */
  struct netbuf *   netbuf_new      (void);
  void              netbuf_delete   (struct netbuf *buf);
  void *            netbuf_alloc    (struct netbuf *buf, u16_t size);
  void              netbuf_free     (struct netbuf *buf);
  err_t             netbuf_ref      (struct netbuf *buf,
                                     const void *dataptr, u16_t size);
  void              netbuf_chain    (struct netbuf *head, struct netbuf *tail);
  
  err_t             netbuf_data     (struct netbuf *buf,
                                     void **dataptr, u16_t *len);
  s8_t              netbuf_next     (struct netbuf *buf);
  void              netbuf_first    (struct netbuf *buf);
  
  
  #define netbuf_copy_partial(buf, dataptr, len, offset) \
    pbuf_copy_partial((buf)->p, (dataptr), (len), (offset))
  #define netbuf_copy(buf,dataptr,len) netbuf_copy_partial(buf, dataptr, len, 0)
  #define netbuf_take(buf, dataptr, len) pbuf_take((buf)->p, dataptr, len)
  #define netbuf_len(buf)              ((buf)->p->tot_len)
  #define netbuf_fromaddr(buf)         (&((buf)->addr))
  #define netbuf_set_fromaddr(buf, fromaddr) ip_addr_set(&((buf)->addr), fromaddr)
  #define netbuf_fromport(buf)         ((buf)->port)
  #if LWIP_NETBUF_RECVINFO
  #define netbuf_destaddr(buf)         (&((buf)->toaddr))
  #define netbuf_set_destaddr(buf, destaddr) ip_addr_set(&((buf)->toaddr), destaddr)
  #if LWIP_CHECKSUM_ON_COPY
  #define netbuf_destport(buf)         (((buf)->flags & NETBUF_FLAG_DESTADDR) ? (buf)->toport_chksum : 0)
  #else /* LWIP_CHECKSUM_ON_COPY */
  #define netbuf_destport(buf)         ((buf)->toport_chksum)
  #endif /* LWIP_CHECKSUM_ON_COPY */
  #endif /* LWIP_NETBUF_RECVINFO */
  #if LWIP_CHECKSUM_ON_COPY
  #define netbuf_set_chksum(buf, chksum) do { (buf)->flags = NETBUF_FLAG_CHKSUM; \
                                              (buf)->toport_chksum = chksum; } while(0)
  #endif /* LWIP_CHECKSUM_ON_COPY */
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* LWIP_NETCONN || LWIP_SOCKET */
  
  #endif /* LWIP_HDR_NETBUF_H */
  