📄 http.lst
字号:
C51 COMPILER V7.20 HTTP 03/07/2006 14:49:15 PAGE 1
C51 COMPILER V7.20, COMPILATION OF MODULE HTTP
OBJECT MODULE PLACED IN Http.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE Http.c OPTIMIZE(9,SPEED) BROWSE DEBUG OBJECTEXTEND
line level source
1 //-----------------------------------------------------------------------------
2 // Net HTTP.C
3 //
4 // This module is the Web Server
5 // It currently serves a html text page and a jpeg image, or handles
6 // a POST message to turn an LED on or off.
7 // The HTTP protocol specification is at http://www.w3.org/Protocols/
8 //-----------------------------------------------------------------------------
9 #include <string.h>
10 #include <stdlib.h>
11 #include <ctype.h> // toupper
12 #include "C8051f.h"
13 #include "net.h"
14 #include "serial.h"
15 #include "cksum.h"
16 //#include "analog.h"
17 #include "ip.h"
18 #include "tcp.h"
19 #include "http.h"
20
21
22 // These structures keep track of connection information
23 extern CONNECTION xdata conxn[];
24
25 extern ULONG code my_ipaddr;
26 extern char xdata text[];
27 extern UINT idata cpu_temperature;
28 extern UINT idata air_temperature;
29 //extern UINT idata cpu_voltage;
30 extern char code html_header[];
31 extern char code web_page[];
32 extern char code jpeg_header[];
33 extern UCHAR code photo1_jpeg[];
34 extern UCHAR idata rcve_buf_allocated;
35 extern UCHAR idata debug;
36 bit CONTROL_LED;
37 //void LightONOFF(bit b);
38
39 void init_http(void)
40 {
41 1 // CONTROL_LED = 0;//主要利用灯来显示
42 1 // LightONOFF(CONTROL_LED);
43 1 }
44
45 //------------------------------------------------------------------------
46 // This function is the standard string search. The Keil library
47 // does not provide it. It looks for one string in another string
48 // and returns a pointer to it if found, otherwise returns NULL.
49 //
50 //------------------------------------------------------------------------
51 char * strstr(char * haystack, char * needle)
52 {
53 1 char *ptr1, *ptr2;
54 1
55 1 // Protect against NULL pointer
C51 COMPILER V7.20 HTTP 03/07/2006 14:49:15 PAGE 2
56 1 if (*needle == 0) return(haystack);
57 1 for( ; *haystack; haystack++ )
58 1 {
59 2 // Look for needle in haystack. If there is a
60 2 // match then this will continue all the way
61 2 // until ptr1 reaches the NULL at the end of needle
62 2 for(ptr1 = needle, ptr2 = haystack; *ptr1 && (*ptr1 == *ptr2); ++ptr1, ++ptr2);
63 2
64 2 // If there is a match then return pointer to needle in haystack
65 2 if(*ptr1 == 0) return(haystack);
66 2 }
67 1 return NULL; // no matching string found
68 1 }
69
70
71 //------------------------------------------------------------------------
72 // This sends an TCP segment to the ip layer. The segment is
73 // is normally either a web page or a graphic.
74 // See "TCP/IP Illustrated, Volume 1" Sect 17.3
75 // HTTP发送，传送到IP层，这个段通常是网页或者图像。
76 //------------------------------------------------------------------------
77 void http_send(UCHAR xdata * outbuf, UINT len, UCHAR nr)
78 {
79 1 TCP_HEADER xdata * tcp;
80 1 IP_HEADER xdata * ip;
81 1 ULONG idata sum;
82 1 UINT idata result;
83 1
84 1 // Fill in TCP segment header
85 1 tcp = (TCP_HEADER xdata *)(outbuf + 34);
86 1 ip = (IP_HEADER xdata *)(outbuf + 14);
87 1
88 1 tcp->source_port = HTTP_PORT;
89 1 tcp->dest_port = conxn[nr].port;
90 1 tcp->sequence = conxn[nr].my_sequence;
91 1 tcp->ack_number = conxn[nr].his_sequence;
92 1
93 1 // Header is always 20 bytes long
94 1 tcp->flags = 0x5000 | FLG_ACK | FLG_PSH;
95 1 tcp->window = 1024;
96 1 tcp->checksum = 0;
97 1 tcp->urgent_ptr = 0;
98 1
99 1 // Compute checksum including 12 bytes of pseudoheader
100 1 // Must pre-fill 2 items in ip header to do this
101 1 ip->dest_ipaddr = conxn[nr].ipaddr;
102 1 ip->source_ipaddr = my_ipaddr;
103 1
104 1 // Sum source_ipaddr, dest_ipaddr, and entire TCP message
105 1 sum = (ULONG)cksum(outbuf + 26, 8 + len);
106 1
107 1 // Add in the rest of pseudoheader which is
108 1 // protocol id and TCP segment length
109 1 sum += (ULONG)0x0006;
110 1 sum += (ULONG)len;
111 1
112 1 // In case there was a carry, add it back around
113 1 result = (UINT)(sum + (sum >> 16));
114 1 tcp->checksum = ~result;
115 1
116 1 if (debug) SendCommString("TCP: Sending msg to IP layer\r");
117 1 ip_send(outbuf, conxn[nr].ipaddr, TCP_TYPE, len);
C51 COMPILER V7.20 HTTP 03/07/2006 14:49:15 PAGE 3
118 1
119 1 // (Re)start TCP retransmit timer
120 1 conxn[nr].timer = TCP_TIMEOUT;
121 1 }
122
123
124
125 //------------------------------------------------------------------------
126 // This searches a web page looking for a specified tag. If found,
127 // it replaces the tag with the text in * sub. Tags are fixed length -
128 // The first 4 chars of the tag is always "TAG:" and the rest of it
129 // is always 4 chars for a total of 8 chars.
130 //------------------------------------------------------------------------
131 void replace_tag(UCHAR xdata * start, char * tag, char * sub)
132 {
133 1 UCHAR idata i, flg;
134 1 UCHAR xdata * ptr;
135 1
136 1 // Find tag. If not found - just return
137 1 ptr = strstr(start, tag);
138 1 if (ptr == NULL) return;
139 1
140 1 flg = TRUE;
141 1
142 1 // Replace the 8 char tag with the substitute text
143 1 // Pad on the right with spaces
144 1 for (i=0; i < 8; i++)
145 1 {
146 2 if (sub[i] == 0) flg = FALSE;
147 2 if (flg) ptr[i] = sub[i]; else ptr[i] = SPACE;
148 2 }
149 1 }
150
151
152
153 //------------------------------------------------------------------------
154 // This serves up either a HTML page, a JPEG image, or controls an
155 // LED, depending what it gets from the browser. The received header
156 // must contain the word "GET" or "POST" to be considered a valid request.
157 // With HTTP 1.1 where the connection is left open, the header I send
158 // should include content length. With HTTP 1.0 you can just close the
159 // connection after sending the page and the browser knows its done.
160 //
161 // The HTTP protocol specification is at http://www.w3.org/Protocols/
162 //------------------------------------------------------------------------
163 UINT http_server(UCHAR xdata * inbuf, UINT header_len, UCHAR nr, UCHAR resend)
164 {
165 1 UCHAR i;
166 1 UINT idata body_len, hhdr_len, jhdr_len, page_len, jpeg_len;
167 1 UINT idata sent, remaining;
168 1 UCHAR xdata * outbuf;
169 1 UCHAR xdata * ptr;
170 1 UCHAR xdata * tcp_data;
171 1 UCHAR idata request;
172 1 static UCHAR idata post_flg = FALSE;
173 1
174 1 // Make sure this is a valid connection
175 1 if (nr == NO_CONNECTION) return 0;
176 1
177 1 // Compute start of TCP data
178 1
179 1 // Save first 20 chars and seq number just in case
C51 COMPILER V7.20 HTTP 03/07/2006 14:49:15 PAGE 4
180 1 // we need to re-generate page
181 1 // TODO: if post, then save switch state infomation
182 1 if (!resend)
183 1 {
184 2 tcp_data = inbuf + 34 + header_len;
185 2 memcpy(conxn[nr].query, tcp_data, 20);
186 2 conxn[nr].old_sequence = conxn[nr].my_sequence;
187 2 }
188 1 // If this is a resend, set sequence number to what it was
189 1 // the last time we sent this
190 1 else
191 1 {
192 2 tcp_data = inbuf;
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -