text: /*
   * Copyright (c) 2001, Adam Dunkels.
   * 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 uIP TCP/IP stack.
   *
   *
   */
  
  #include <stdlib.h>
  #include <string.h>
  #include <stdio.h>
  
  #include "uip.h"
  #include "uip_arch.h"
  #include "uip_ip.h"
  #include "uip_tcp.h"
  #include "uip_pbuf.h"
  
  /*-----------------------------------------------------------------------------------*/
  u16_t uip_chksum(u16_t *sdata, u32_t len)
  {
    u32_t acc;
  
    for(acc = 0;len > 1;len -= 2) {
      acc += *sdata++;
    }
  
    /* add up any odd byte */
    if(len==1) {
      acc += htons((u16_t)((((u8_t *)sdata)[0]&0xff)<<8));
    }
    while(acc>>16) acc = (acc&0xffffUL)+(acc>>16);
  
    return (u16_t)acc;
  }
  
  /*-----------------------------------------------------------------------------------*/
  u16_t uip_chksum_pseudo(struct uip_pbuf *p,struct uip_ip_addr *src,struct uip_ip_addr *dst,u8_t proto,u16_t proto_len)
  {
  	u32_t acc,len,rem;
  	struct uip_pbuf *q;
  
  	acc = 0;
  
  	rem = proto_len;
  	for(q=p;q!=NULL && rem>0;q=q->next) {
  		len = (rem>q->len)?q->len:rem;
  		acc += uip_chksum(q->payload,len);
  		rem -= len;
  	}
  
  	acc += (src->addr&0xffffUL);
  	acc += ((src->addr>>16)&0xffffUL);
  	acc += (dst->addr&0xffffUL);
  	acc += ((dst->addr>>16)&0xffffUL);
  	acc += (u32_t)htons(proto);
  	acc += (u32_t)htons(proto_len);
  
  	while(acc>>16) acc = (acc&0xffffUL)+(acc>>16);
  
  	return (u16_t)~(acc&0xffffUL);
  }
  /*-----------------------------------------------------------------------------------*/
  u16_t
  uip_ipchksum(void *dataptr,u16_t len)
  {
    return ~(uip_chksum(dataptr,len));
  }
  
  u16_t uip_ipchksum_pbuf(struct uip_pbuf *p)
  {
    u32_t acc;
    struct uip_pbuf *q;
  
    acc = 0;
    for(q = p; q != NULL; q = q->next) {
  	acc += uip_chksum(q->payload,q->len);
    }
    while(acc>>16) acc = (acc&0xffffUL)+(acc>>16);
  
    return (u16_t)~(acc & 0xffffUL);
  }
  
  void uip_log(const char *filename,int line_nb,char *msg)
  {
  	printf("%s(%d):\n%s\n",filename,line_nb,msg);
  }
  
  /*-----------------------------------------------------------------------------------*/
  