wpinit.c

基于凌阳系列单片机的以太网驱动程序

/*=========================================================================
*  Filename:   WPInit.c
*  Function Description: dynamic/static web page initialize and release. 
*  Author:    Gong Zhigang
*  Date:      2004/03/10
*  Email:     [e-mail]
*
*========================================================================*/
/*
#include "lwip/debug.h"
#include "lwip/stats.h"
#include "lwip/tcp.h"
#include "pollio.h"*/
#include "config.h"
#include "httpd.h"
#include "fs.h"
#include "web.h"



/**********************************************************************
argument:
           file:   web file point
           opt:    0- static initialize
                   1- dynamic initialize
return:    webdata point, include the web page data                     
**********************************************************************/
struct  webdata  *Web_Init(struct fs_file *file,u16_t opt)
 {
   struct webdata *headw=NULL, *web=NULL,*tweb=NULL;
   u16_t i,j;
   u16_t newpart, attr=STATIC,*payload;
   newpart = 1;          //the beginning is always static web data.

if (file->data == NULL)
return NULL;                      //  

   for(i=0;i<file->len;i++)
 {
       if (1==newpart)
          {
           if (0==i) j = -3;
           else j = i;
           newpart = 0;
           tweb = mem_malloc(sizeof (struct webdata));
           tweb->payload = file->data + (j+3)/2 ;
           tweb->offset = 0;
           tweb->attr = attr;
           if (headw != NULL)
              {
              web->next = tweb;
              web->len = (j-1) - (web->payload - file->data)*2;
 			  if (web->attr == DYNAMIC) 
 			  if (web_head_alloc(headw,web)!=ERR_OK)
 			          return NULL;
 			          //return headw;
			  if (web->attr == STATIC)
			     if (web->len%2)      //avoid odd bytes
			       {
			       web->len--;
			       } 			          
              }
            else 
               {
               headw = tweb;
               } 
            web = tweb;
           if (opt == 0) { i = file->len; break; }  //pure static web page 
          }
 
   if (getbyte(file->data,i)=='@')     
      if (getbyte(file->data,i+1) == '@')
      {
        if (getbyte(file->data,i+2) == '$')
            {
            attr = STATIC;   
            newpart = 1;
            }
         else if(getbyte(file->data,i+2) == '#')  
            {
           attr = DYNAMIC;
           newpart = 1;
            } 
       }//@@
      }//for
   
if (headw!=NULL) 
   { 
     web->next = NULL;
     web->len = i - (web->payload - file->data)*2;
     if (web->attr == DYNAMIC) web_head_alloc(headw,web);
    }
   return headw;
}


/**********************************************************************
argument:
           head:   web data point is to be free
return:    void                   
**********************************************************************/
void web_free(struct webdata *head)
{
struct webdata *tw, *stw;
 if (head!=NULL)
   {
   for(tw = head, stw = head->next; tw!=NULL; tw = stw, stw = stw->next)
   {
    if (tw->attr == DYNAMIC)
    mem_free(tw->payload);
    mem_free(tw);
   }
  }
}

/**********************************************************************
argument:
           headw:   web data header point
           web:     dynamic web data point,which length is web->len(byte)
return:    err_t, if there is no ram return ERR_MEM,or return ERR_OK                   
**********************************************************************/
err_t web_head_alloc(struct webdata *headw, struct webdata *web)
{
u16_t *payload;
           payload = mem_malloc((web->len+1)/2);
           if (payload == NULL)
                 {
                  web_free(headw);
                  return ERR_MEM;
                   }
            //if                    
            memcpy(payload,web->payload,(web->len+1)/2);
            web->payload = payload;
	return ERR_OK;
}