http.c

51单片机加rt8019硬件平台,上web方案及详细代码

//-----------------------------------http.c-----------------------------
//#define DEBUG          1

#include<string.h>
#include"includes.h"
#include"logo.c"

#define NONE					0
#define GET_PAGE          	1
#define GET_JPEG           2
#define POST_PAGE				3


extern TCB xdata conn[5];

extern char code html_header[];
extern char code web_page[];
extern char code jpeg_header[];
extern uchar code photo1_jpeg[]; 


void http_send(uchar xdata * outbuf, uint len, uchar nr)
{
	Tcp_Header xdata * tcp;
	Ip_Header xdata * ip;
	ulong idata sum;
	uint idata result; 
	         
	TRACE("ENTER http_send",NULL,0,0);
	
	tcp = (Tcp_Header xdata *)(outbuf + 34);
	ip = (Ip_Header xdata *)(outbuf + 14);
#ifdef OSCAR_DEBUG
//	TRACE("HttpData=",outbuf+54,100,0);
	TRACE("HttpData=",0,0,0);
	uart_send(outbuf, 100);
#endif
	//填充TCP报文首部
	tcp->source_port = HTTP_PORT;
	tcp->dest_port = conn[nr].port;
	tcp->sn = conn[nr].my_sn;
	tcp->ack_sn = conn[nr].his_sn;
      
	//20 bytes首部长度
	tcp->flags = 0x5000 | FLG_ACK | FLG_PSH;
	tcp->window = 1024;
	tcp->checksum = 0;
	tcp->urgent_ptr = 0;
   
	//计算校验码包括12byte的伪首部
	ip->dest_ipaddr = conn[nr].ipaddr;
	ip->source_ipaddr = myipaddr;
	sum = (ulong)cksum(outbuf + 26, 8 + len);
				
	//加上协议类型和TCP总长度
	sum += (ulong)0x0006;
	sum += (ulong)len;

	//进位处理
	result = (uint)(sum + (sum >> 16));
	tcp->checksum = ~result;   

	ip_send(outbuf, conn[nr].ipaddr, TCP_TYPE, len);

   // (Re)start TCP retransmit timer
   conn[nr].timer = TCP_TIMEOUT;
}


uint http_server(uchar xdata * inbuf, uint header_len, uchar nr, uchar resend)
{
	
	uint idata body_len, hhdr_len,  page_len;  
	char xdata text[10];
	uchar xdata * tcp_data;
	uchar idata request;
	static uchar idata post_flg = FALSE;
	uchar xdata * ptr;
	
	TRACE("ENTER http_server",NULL,0,0);	    	
	// Make sure this is a valid connection
	if (nr == NO_CONN) return 0;
										 

	if (!resend)
	{
		tcp_data = inbuf + 34 + header_len;
		memcpy(conn[nr].query, tcp_data, 20);
		conn[nr].old_sn = conn[nr].my_sn;
		TRACE("HTTP_HEARD = ",tcp_data,300,1); 		
	}
   // If this is a resend, set sequence number to what it was 
	else
	{
		tcp_data = inbuf;
		conn[nr].my_sn = conn[nr].old_sn;   
	}
	request = NONE;      

	if (strfind(tcp_data, "POST") != NULL)
	{
	 	post_flg = TRUE;
		TRACE("RECV > POST",NULL,0,0); 
	 }  
	// See if this is a GET message
	else if (strfind(tcp_data, "GET") != NULL)
	{
		TRACE("RECV > GET",NULL,0,0);
      post_flg = FALSE;
      if (strfind(tcp_data, "photo1") != NULL) request = GET_JPEG;
      else if (strfind(tcp_data, "index") != NULL) request = GET_PAGE;
      else if (strfind(tcp_data, "/ ") != NULL) request = GET_PAGE;
	}   

	if (post_flg)
	{
		ptr = strfind(tcp_data, "switch=");
		if (ptr != NULL)
		{
			post_flg = FALSE;
			request = POST_PAGE;
//			ptr += 7;
//			if (*ptr == '1') {CONTROL_LED=0x0;}   
//			else if (*ptr == '0') {CONTROL_LED=0x1;}
//			LightONOFF(CONTROL_LED);
		}
	}

   if ((request == GET_PAGE) || (request == POST_PAGE))
   {
      // Figure out sizes
      hhdr_len = strlen(html_header);
      page_len = strlen(web_page);
      body_len = hhdr_len + page_len;
      
      // Free memory holding received message.  The message from the
      // browser can be 500+ bytes long so this is a significant 
      // chunk out of the available malloc space of 1500 bytes
      if (!resend) {;}

      if (outbuf == NULL)
      {	
         return 0;
      }
      
      // Copy page data.  This moves data from flash into RAM.  It is
      // an undesirable process, but must get data into RAM to replace
      // tags 
		memcpy(outbuf + 54, html_header, hhdr_len);
		memcpy(outbuf + 54 + hhdr_len, web_page, page_len);
   	   	   	
   		outbuf[54 + body_len] = 0;		// Append NULL
		
		itoa(page_len, text, 10);
		replace_tag(outbuf + 54, "TAG:LEN1", text,8);
		replace_tag(outbuf + 54, "123456789012", __DATE__,12);
		replace_tag(outbuf + 54, "987654321", __TIME__,9);

      http_send(outbuf, body_len + 20, nr);
      conn[nr].my_sn += body_len;
   }
   else if (request == GET_JPEG)
   {
      // Figure out sizes
 //     hhdr_len = strlen(bmp_GTCLogo);
 //     page_len = strlen(web_page);
      body_len = strlen(bmp_GTCLogo);
      
      // Free memory holding received message.  The message from the
      // browser can be 500+ bytes long so this is a significant 
      // chunk out of the available malloc space of 1500 bytes
      if (!resend) {;}

      if (outbuf == NULL)
      {	
         return 0;
      }
      
//		memcpy(outbuf + 54, html_header, hhdr_len);
		memcpy(outbuf + 54 , bmp_GTCLogo, body_len);
   	   	   	
   		outbuf[54 + body_len] = 0;		// Append NULL
		
		itoa(page_len, text, 10);

      http_send(outbuf, body_len + 20, nr);

   }
   else
   { 
      return 0;
   }
   
   // Return number of bytes sent, not including TCP header
	return(body_len);
}