📄 http.lst
字号:
C51 COMPILER V7.50 HTTP 08/03/2006 09:34:43 PAGE 1
C51 COMPILER V7.50, COMPILATION OF MODULE HTTP
OBJECT MODULE PLACED IN Http.OBJ
COMPILER INVOKED BY: C:\Keil750\C51\BIN\c51.exe Http.c DB OE
line 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 "cksum.h"
18 #include "analog.h"
19 #include "ip.h"
20 #include "tcp.h"
21 #include "http.h"
22
23
24 // These structures keep track of connection information
25 extern CONNECTION xdata conxn[];
26
27 extern ULONG code my_ipaddr;
28 extern char xdata text[];
29 extern UINT idata cpu_temperature;
30 extern UINT idata air_temperature;
31 extern UINT idata cpu_voltage;
32 extern char code html_header[];
33 extern char code web_page[];
34 extern char code jpeg_header[];
35 extern UCHAR code photo1_jpeg[];
36 extern UCHAR idata rcve_buf_allocated;
37 extern UCHAR idata debug;
38 bit CONTROL_LED;
39 void LightONOFF(bit b);
40 extern char xdata outbuf1[];
41
42 void init_http(void)
43 {
44 1 CONTROL_LED = 0;
45 1 LightONOFF(CONTROL_LED);
46 1 }
47
48 char * itoa(UINT value, char * buf, UCHAR radix)
49 {
50 1 UINT i;
51 1 char * ptr;
52 1 char * temphold;
53 1
54 1 temphold = buf;
55 1 ptr = buf + 12;
C51 COMPILER V7.50 HTTP 08/03/2006 09:34:43 PAGE 2
56 1 *--ptr = 0; // Insert NULL char
57 1 do
58 1 {
59 2 // First create string in reverse order
60 2 i = (value % radix) + 0x30;
61 2 if(i > 0x39) i += 7;
62 2 *--ptr = i;
63 2 value = value / radix;
64 2 } while(value != 0);
65 1
66 1 // Next, move the string 6 places to the left
67 1 // Include NULL character
68 1 for( ; (*buf++ = *ptr++); );
69 1 return(temphold);
70 1 }
71
72 //------------------------------------------------------------------------
73 // This function is the standard string search. The Keil library
74 // does not provide it. It looks for one string in another string
75 // and returns a pointer to it if found, otherwise returns NULL.
76 //------------------------------------------------------------------------
77 char * strstr(char * haystack, char * needle)
78 {
79 1 char *ptr1, *ptr2;
80 1
81 1 // Protect against NULL pointer
82 1 if (*needle == 0) return(haystack);
83 1 for( ; *haystack; haystack++ )
84 1 {
85 2 // Look for needle in haystack. If there is a
86 2 // match then this will continue all the way
87 2 // until ptr1 reaches the NULL at the end of needle
88 2 for(ptr1 = needle, ptr2 = haystack; *ptr1 && (*ptr1 == *ptr2); ++ptr1, ++ptr2);
89 2
90 2 // If there is a match then return pointer to needle in haystack
91 2 if(*ptr1 == 0) return(haystack);
92 2 }
93 1 return NULL; // no matching string found
94 1 }
95
96
97
98 //------------------------------------------------------------------------
99 // This sends an TCP segment to the ip layer. The segment is
100 // is normally either a web page or a graphic.
101 // See "TCP/IP Illustrated, Volume 1" Sect 17.3
102 //------------------------------------------------------------------------
103 void http_send(UCHAR xdata * outbuf, UINT len, UCHAR nr)
104 {
105 1 TCP_HEADER xdata * tcp;
106 1 IP_HEADER xdata * ip;
107 1 ULONG idata sum;
108 1 UINT idata result;
109 1
110 1 // Fill in TCP segment header
111 1 tcp = (TCP_HEADER xdata *)(outbuf + 34);
112 1 ip = (IP_HEADER xdata *)(outbuf + 14);
113 1
114 1 tcp->source_port = HTTP_PORT;
115 1 tcp->dest_port = conxn[nr].port;
116 1 tcp->sequence = conxn[nr].my_sequence;
117 1 tcp->ack_number = conxn[nr].his_sequence;
C51 COMPILER V7.50 HTTP 08/03/2006 09:34:43 PAGE 3
118 1
119 1 // Header is always 20 bytes long
120 1 tcp->flags = 0x5000 | FLG_ACK | FLG_PSH;
121 1 tcp->window = 1024;
122 1 tcp->checksum = 0;
123 1 tcp->urgent_ptr = 0;
124 1
125 1 // Compute checksum including 12 bytes of pseudoheader
126 1 // Must pre-fill 2 items in ip header to do this
127 1 ip->dest_ipaddr = conxn[nr].ipaddr;
128 1 ip->source_ipaddr = my_ipaddr;
129 1
130 1 // Sum source_ipaddr, dest_ipaddr, and entire TCP message
131 1 sum = (ULONG)cksum(outbuf + 26, 8 + len);
132 1
133 1 // Add in the rest of pseudoheader which is
134 1 // protocol id and TCP segment length
135 1 sum += (ULONG)0x0006;
136 1 sum += (ULONG)len;
137 1
138 1 // In case there was a carry, add it back around
139 1 result = (UINT)(sum + (sum >> 16));
140 1 tcp->checksum = ~result;
141 1
142 1 ip_send(outbuf, conxn[nr].ipaddr, TCP_TYPE, len);
143 1
144 1 // (Re)start TCP retransmit timer
145 1 conxn[nr].timer = TCP_TIMEOUT;
146 1 }
147
148
149
150 //------------------------------------------------------------------------
151 // This searches a web page looking for a specified tag. If found,
152 // it replaces the tag with the text in * sub. Tags are fixed length -
153 // The first 4 chars of the tag is always "TAG:" and the rest of it
154 // is always 4 chars for a total of 8 chars.
155 //------------------------------------------------------------------------
156 void replace_tag(UCHAR xdata * start, char * tag, char * sub)
157 {
158 1 UCHAR idata i, flg;
159 1 UCHAR xdata * ptr;
160 1
161 1 // Find tag. If not found - just return
162 1 ptr = strstr(start, tag);
163 1 if (ptr == NULL) return;
164 1
165 1 flg = TRUE;
166 1
167 1 // Replace the 8 char tag with the substitute text
168 1 // Pad on the right with spaces
169 1 for (i=0; i < 8; i++)
170 1 {
171 2 if (sub[i] == 0) flg = FALSE;
172 2 if (flg) ptr[i] = sub[i]; else ptr[i] = SPACE;
173 2 }
174 1 }
175
176
177
178 //------------------------------------------------------------------------
179 // This serves up either a HTML page, a JPEG image, or controls an
C51 COMPILER V7.50 HTTP 08/03/2006 09:34:43 PAGE 4
180 // LED, depending what it gets from the browser. The received header
181 // must contain the word "GET" or "POST" to be considered a valid request.
182 // With HTTP 1.1 where the connection is left open, the header I send
183 // should include content length. With HTTP 1.0 you can just close the
184 // connection after sending the page and the browser knows its done.
185 //
186 // The HTTP protocol specification is at http://www.w3.org/Protocols/
187 //------------------------------------------------------------------------
188 UINT http_server(UCHAR xdata * inbuf, UINT header_len, UCHAR nr, UCHAR resend)
189 {
190 1 UCHAR i;
191 1 UINT idata body_len, hhdr_len, jhdr_len, page_len, jpeg_len;
192 1 UINT idata sent, remaining;
193 1 UCHAR xdata * outbuf;
194 1 UCHAR xdata * ptr;
195 1 UCHAR xdata * tcp_data;
196 1 UCHAR idata request;
197 1 static UCHAR idata post_flg = FALSE;
198 1
199 1 // Make sure this is a valid connection
200 1 if (nr == NO_CONNECTION) return 0;
201 1
202 1 // Compute start of TCP data
203 1
204 1 // Save first 20 chars and seq number just in case
⌨️ 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 + -