?? http.lst
字號:
C51 COMPILER V7.06 HTTP 07/29/2006 13:15:57 PAGE 1
C51 COMPILER V7.06, COMPILATION OF MODULE HTTP
OBJECT MODULE PLACED IN Http.OBJ
COMPILER INVOKED BY: c:\KEIL\C51\BIN\C51.exe Http.c DB OE
stmt level source
1 //-----------------------------------------------------------------------------
2 // Copyright (c) 2002 Jim Brady
3 // Do not use commercially without author's permission
4 // Last revised August 2002
5 // Net HTTP.C
6 //
7 // This module is the Web Server
8 // It currently serves a html text page and a jpeg image, or handles
9 // a POST message to turn an LED on or off.
10 // The HTTP protocol specification is at http://www.w3.org/Protocols/
11 //-----------------------------------------------------------------------------
12 #include <string.h>
13 #include <stdlib.h>
14 #include <ctype.h> // toupper
15 #include "C8051f.h"
16 #include "net.h"
17 #include "serial.h"
18 #include "cksum.h"
19 #include "analog.h"
20 #include "ip.h"
21 #include "tcp.h"
22 #include "http.h"
23
24
25 // These structures keep track of connection information
26 extern CONNECTION xdata conxn[];
27
28 extern ULONG code my_ipaddr;
29 extern char xdata text[];
30 extern UINT idata cpu_temperature;
31 extern UINT idata air_temperature;
32 extern UINT idata cpu_voltage;
33 extern char code html_header[];
34 extern char code web_page[];
35 extern char code jpeg_header[];
36 extern UCHAR code photo1_jpeg[];
37 extern UCHAR idata rcve_buf_allocated;
38 extern UCHAR idata debug;
39 bit CONTROL_LED;
40 void LightONOFF(bit b);
41
42 void init_http(void)
43 {
44 1 CONTROL_LED = 0;
45 1 LightONOFF(CONTROL_LED);
46 1 }
47
48
49
50 //------------------------------------------------------------------------
51 // This function is the standard string search. The Keil library
52 // does not provide it. It looks for one string in another string
53 // and returns a pointer to it if found, otherwise returns NULL.
54 //------------------------------------------------------------------------
55 char * strstr(char * haystack, char * needle)
C51 COMPILER V7.06 HTTP 07/29/2006 13:15:57 PAGE 2
56 {
57 1 char *ptr1, *ptr2;
58 1
59 1 // Protect against NULL pointer
60 1 if (*needle == 0) return(haystack);
61 1 for( ; *haystack; haystack++ )
62 1 {
63 2 // Look for needle in haystack. If there is a
64 2 // match then this will continue all the way
65 2 // until ptr1 reaches the NULL at the end of needle
66 2 for(ptr1 = needle, ptr2 = haystack; *ptr1 && (*ptr1 == *ptr2); ++ptr1, ++ptr2);
67 2
68 2 // If there is a match then return pointer to needle in haystack
69 2 if(*ptr1 == 0) return(haystack);
70 2 }
71 1 return NULL; // no matching string found
72 1 }
73
74
75
76 //------------------------------------------------------------------------
77 // This sends an TCP segment to the ip layer. The segment is
78 // is normally either a web page or a graphic.
79 // See "TCP/IP Illustrated, Volume 1" Sect 17.3
80 //------------------------------------------------------------------------
81 void http_send(UCHAR xdata * outbuf, UINT len, UCHAR nr)
82 {
83 1 TCP_HEADER xdata * tcp;
84 1 IP_HEADER xdata * ip;
85 1 ULONG idata sum;
86 1 UINT idata result;
87 1
88 1 // Fill in TCP segment header
89 1 tcp = (TCP_HEADER xdata *)(outbuf + 34);
90 1 ip = (IP_HEADER xdata *)(outbuf + 14);
91 1
92 1 tcp->source_port = HTTP_PORT;
93 1 tcp->dest_port = conxn[nr].port;
94 1 tcp->sequence = conxn[nr].my_sequence;
95 1 tcp->ack_number = conxn[nr].his_sequence;
96 1
97 1 // Header is always 20 bytes long
98 1 tcp->flags = 0x5000 | FLG_ACK | FLG_PSH;
99 1 tcp->window = 1024;
100 1 tcp->checksum = 0;
101 1 tcp->urgent_ptr = 0;
102 1
103 1 // Compute checksum including 12 bytes of pseudoheader
104 1 // Must pre-fill 2 items in ip header to do this
105 1 ip->dest_ipaddr = conxn[nr].ipaddr;
106 1 ip->source_ipaddr = my_ipaddr;
107 1
108 1 // Sum source_ipaddr, dest_ipaddr, and entire TCP message
109 1 sum = (ULONG)cksum(outbuf + 26, 8 + len);
110 1
111 1 // Add in the rest of pseudoheader which is
112 1 // protocol id and TCP segment length
113 1 sum += (ULONG)0x0006;
114 1 sum += (ULONG)len;
115 1
116 1 // In case there was a carry, add it back around
117 1 result = (UINT)(sum + (sum >> 16));
C51 COMPILER V7.06 HTTP 07/29/2006 13:15:57 PAGE 3
118 1 tcp->checksum = ~result;
119 1
120 1 if (debug) serial_send("TCP: Sending msg to IP layer\r");
121 1 ip_send(outbuf, conxn[nr].ipaddr, TCP_TYPE, len);
122 1
123 1 // (Re)start TCP retransmit timer
124 1 conxn[nr].timer = TCP_TIMEOUT;
125 1 }
126
127
128
129 //------------------------------------------------------------------------
130 // This searches a web page looking for a specified tag. If found,
131 // it replaces the tag with the text in * sub. Tags are fixed length -
132 // The first 4 chars of the tag is always "TAG:" and the rest of it
133 // is always 4 chars for a total of 8 chars.
134 //------------------------------------------------------------------------
135 void replace_tag(UCHAR xdata * start, char * tag, char * sub)
136 {
137 1 UCHAR idata i, flg;
138 1 UCHAR xdata * ptr;
139 1
140 1 // Find tag. If not found - just return
141 1 ptr = strstr(start, tag);
142 1 if (ptr == NULL) return;
143 1
144 1 flg = TRUE;
145 1
146 1 // Replace the 8 char tag with the substitute text
147 1 // Pad on the right with spaces
148 1 for (i=0; i < 8; i++)
149 1 {
150 2 if (sub[i] == 0) flg = FALSE;
151 2 if (flg) ptr[i] = sub[i]; else ptr[i] = SPACE;
152 2 }
153 1 }
154
155
156
157 //------------------------------------------------------------------------
158 // This serves up either a HTML page, a JPEG image, or controls an
159 // LED, depending what it gets from the browser. The received header
160 // must contain the word "GET" or "POST" to be considered a valid request.
161 // With HTTP 1.1 where the connection is left open, the header I send
162 // should include content length. With HTTP 1.0 you can just close the
163 // connection after sending the page and the browser knows its done.
164 //
165 // The HTTP protocol specification is at http://www.w3.org/Protocols/
166 //------------------------------------------------------------------------
167 UINT http_server(UCHAR xdata * inbuf, UINT header_len, UCHAR nr, UCHAR resend)
168 {
169 1 UCHAR i;
170 1 UINT idata body_len, hhdr_len, jhdr_len, page_len, jpeg_len;
171 1 UINT idata sent, remaining;
172 1 UCHAR xdata * outbuf;
173 1 UCHAR xdata * ptr;
174 1 UCHAR xdata * tcp_data;
175 1 UCHAR idata request;
176 1 static UCHAR idata post_flg = FALSE;
177 1
178 1 // Make sure this is a valid connection
179 1 if (nr == NO_CONNECTION) return 0;
C51 COMPILER V7.06 HTTP 07/29/2006 13:15:57 PAGE 4
180 1
181 1 // Compute start of TCP data
182 1
183 1 // Save first 20 chars and seq number just in case
184 1 // we need to re-generate page
185 1 // TODO: if post, then save switch state infomation
186 1 if (!resend)
187 1 {
188 2 tcp_data = inbuf + 34 + header_len;
189 2 memcpy(conxn[nr].query, tcp_data, 20);
190 2 conxn[nr].old_sequence = conxn[nr].my_sequence;
191 2 }
192 1 // If this is a resend, set sequence number to what it was
193 1 // the last time we sent this
194 1 else
?? 快捷鍵說明
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -