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comparison src/http/modules/ngx_http_empty_gif_module.c @ 126:df17fbafec8f NGINX_0_3_10

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nginx 0.3.10 *) Change: the "valid_referers" directive and the "$invalid_referer" variable were moved to the new ngx_http_referer_module from the ngx_http_rewrite_module. *) Change: the "$apache_bytes_sent" variable name was changed to "$body_bytes_sent". *) Feature: the "$sent_http_..." variables. *) Feature: the "if" directive supports the "=" and "!=" operations. *) Feature: the "proxy_pass" directive supports the HTTPS protocol. *) Feature: the "proxy_set_body" directive. *) Feature: the "post_action" directive. *) Feature: the ngx_http_empty_gif_module. *) Feature: the "worker_cpu_affinity" directive for Linux. *) Bugfix: the "rewrite" directive did not unescape URI part in redirect, now it is unescaped except the %00-%25 and %7F-%FF characters. *) Bugfix: nginx could not be built by the icc 9.0 compiler. *) Bugfix: if the SSI was enabled for zero size static file, then the chunked response was encoded incorrectly.
author Igor Sysoev <http://sysoev.ru>
date Tue, 15 Nov 2005 00:00:00 +0300
parents
children 82d695e3d662
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125:97504de1f89e 126:df17fbafec8f
1
2 /*
3 * Copyright (C) Igor Sysoev
4 */
5
6 #include <ngx_config.h>
7 #include <ngx_core.h>
8 #include <ngx_http.h>
9
10
11 static char *ngx_http_empty_gif(ngx_conf_t *cf, ngx_command_t *cmd,
12 void *conf);
13
14 static ngx_command_t ngx_http_empty_gif_commands[] = {
15
16 { ngx_string("empty_gif"),
17 NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS,
18 ngx_http_empty_gif,
19 0,
20 0,
21 NULL },
22
23 ngx_null_command
24 };
25
26
27 /* the minimal single pixel transparent GIF, 43 bytes */
28
29 static u_char ngx_empty_gif[] = {
30
31 'G', 'I', 'F', '8', '9', 'a', /* header */
32
33 /* logical screen descriptor */
34 0x01, 0x00, /* logical screen width */
35 0x01, 0x00, /* logical screen height */
36 0x80, /* global 1-bit color table */
37 0x01, /* background color #1 */
38 0x00, /* no aspect ratio */
39
40 /* global color table */
41 0x00, 0x00, 0x00, /* #0: black */
42 0xff, 0xff, 0xff, /* #1: white */
43
44 /* graphic control extension */
45 0x21, /* extension introducer */
46 0xf9, /* graphic control label */
47 0x04, /* block size */
48 0x01, /* transparent color is given, */
49 /* no disposal specified, */
50 /* user input is not expected */
51 0x00, 0x00, /* delay time */
52 0x01, /* transparent color #1 */
53 0x00, /* block terminator */
54
55 /* image descriptor */
56 0x2c, /* image separator */
57 0x00, 0x00, /* image left position */
58 0x00, 0x00, /* image top position */
59 0x01, 0x00, /* image width */
60 0x01, 0x00, /* image height */
61 0x00, /* no local color table, no interlaced */
62
63 /* table based image data */
64 0x02, /* LZW minimum code size, */
65 /* must be at least 2-bit */
66 0x02, /* block size */
67 0x4c, 0x01, /* compressed bytes 01_001_100, 0000000_1 */
68 /* 100: clear code */
69 /* 001: 1 */
70 /* 101: end of information code */
71 0x00, /* block terminator */
72
73 0x3B /* trailer */
74 };
75
76
77 ngx_http_module_t ngx_http_empty_gif_module_ctx = {
78 NULL, /* preconfiguration */
79 NULL, /* postconfiguration */
80
81 NULL, /* create main configuration */
82 NULL, /* init main configuration */
83
84 NULL, /* create server configuration */
85 NULL, /* merge server configuration */
86
87 NULL, /* create location configuration */
88 NULL /* merge location configuration */
89 };
90
91
92 ngx_module_t ngx_http_empty_gif_module = {
93 NGX_MODULE_V1,
94 &ngx_http_empty_gif_module_ctx, /* module context */
95 ngx_http_empty_gif_commands, /* module directives */
96 NGX_HTTP_MODULE, /* module type */
97 NULL, /* init master */
98 NULL, /* init module */
99 NULL, /* init process */
100 NULL, /* init thread */
101 NULL, /* exit thread */
102 NULL, /* exit process */
103 NULL, /* exit master */
104 NGX_MODULE_V1_PADDING
105 };
106
107
108 static ngx_int_t
109 ngx_http_empty_gif_handler(ngx_http_request_t *r)
110 {
111 ngx_int_t rc;
112 ngx_buf_t *b;
113 ngx_chain_t out;
114
115 if (r->method != NGX_HTTP_GET && r->method != NGX_HTTP_HEAD) {
116 return NGX_HTTP_NOT_ALLOWED;
117 }
118
119 rc = ngx_http_discard_body(r);
120
121 if (rc != NGX_OK && rc != NGX_AGAIN) {
122 return rc;
123 }
124
125 r->headers_out.content_type.len = sizeof("image/gif") - 1;
126 r->headers_out.content_type.data = (u_char *) "image/gif";
127
128 if (r->method == NGX_HTTP_HEAD) {
129 r->headers_out.status = NGX_HTTP_OK;
130
131 rc = ngx_http_send_header(r);
132
133 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
134 return rc;
135 }
136 }
137
138 b = ngx_create_temp_buf(r->pool, sizeof(ngx_empty_gif));
139 if (b == NULL) {
140 return NGX_HTTP_INTERNAL_SERVER_ERROR;
141 }
142
143 out.buf = b;
144 out.next = NULL;
145
146 b->pos = ngx_empty_gif;
147 b->last = ngx_empty_gif + sizeof(ngx_empty_gif);
148 b->last_buf = 1;
149
150 r->headers_out.status = NGX_HTTP_OK;
151 r->headers_out.content_length_n = b->last - b->pos;
152 r->headers_out.last_modified_time = 23349600;
153
154 rc = ngx_http_send_header(r);
155
156 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
157 return rc;
158 }
159
160 return ngx_http_output_filter(r, &out);;
161 }
162
163
164 static char *
165 ngx_http_empty_gif(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
166 {
167 ngx_http_core_loc_conf_t *clcf;
168
169 clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
170 clcf->handler = ngx_http_empty_gif_handler;
171
172 return NGX_CONF_OK;
173 }