Mercurial > hg > nginx
annotate src/http/modules/ngx_http_empty_gif_module.c @ 2213:8cc552c91cd2
bump version
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Tue, 26 Aug 2008 17:23:27 +0000 |
parents | e114a16fc5be |
children | aa5e003d30bf |
rev | line source |
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577 | 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 | |
581 | 31 'G', 'I', 'F', '8', '9', 'a', /* header */ |
577 | 32 |
581 | 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 */ | |
577 | 39 |
581 | 40 /* global color table */ |
41 0x00, 0x00, 0x00, /* #0: black */ | |
42 0xff, 0xff, 0xff, /* #1: white */ | |
577 | 43 |
581 | 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 */ | |
577 | 54 |
581 | 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 */ | |
577 | 62 |
581 | 63 /* table based image data */ |
64 0x02, /* LZW minimum code size, */ | |
65 /* must be at least 2-bit */ | |
66 0x02, /* block size */ | |
577 | 67 0x4c, 0x01, /* compressed bytes 01_001_100, 0000000_1 */ |
581 | 68 /* 100: clear code */ |
69 /* 001: 1 */ | |
70 /* 101: end of information code */ | |
71 0x00, /* block terminator */ | |
577 | 72 |
581 | 73 0x3B /* trailer */ |
577 | 74 }; |
75 | |
76 | |
667 | 77 static ngx_http_module_t ngx_http_empty_gif_module_ctx = { |
577 | 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 | |
645 | 115 if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD))) { |
577 | 116 return NGX_HTTP_NOT_ALLOWED; |
117 } | |
118 | |
1370
cc114c85be0f
rename ngx_http_discard_body() to ngx_http_discard_request_body()
Igor Sysoev <igor@sysoev.ru>
parents:
1038
diff
changeset
|
119 rc = ngx_http_discard_request_body(r); |
577 | 120 |
1374 | 121 if (rc != NGX_OK) { |
577 | 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; | |
1547
e114a16fc5be
add time and length to a HEAD request
Igor Sysoev <igor@sysoev.ru>
parents:
1471
diff
changeset
|
130 r->headers_out.content_length_n = sizeof(ngx_empty_gif); |
e114a16fc5be
add time and length to a HEAD request
Igor Sysoev <igor@sysoev.ru>
parents:
1471
diff
changeset
|
131 r->headers_out.last_modified_time = 23349600; |
577 | 132 |
1471
fc73de3e8df0
response to the HEAD request should be a header only
Igor Sysoev <igor@sysoev.ru>
parents:
1374
diff
changeset
|
133 return ngx_http_send_header(r); |
577 | 134 } |
135 | |
651 | 136 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); |
577 | 137 if (b == NULL) { |
138 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
139 } | |
140 | |
141 out.buf = b; | |
142 out.next = NULL; | |
143 | |
144 b->pos = ngx_empty_gif; | |
145 b->last = ngx_empty_gif + sizeof(ngx_empty_gif); | |
651 | 146 b->memory = 1; |
577 | 147 b->last_buf = 1; |
148 | |
149 r->headers_out.status = NGX_HTTP_OK; | |
613 | 150 r->headers_out.content_length_n = sizeof(ngx_empty_gif); |
577 | 151 r->headers_out.last_modified_time = 23349600; |
152 | |
153 rc = ngx_http_send_header(r); | |
154 | |
155 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) { | |
156 return rc; | |
157 } | |
158 | |
1038 | 159 return ngx_http_output_filter(r, &out); |
577 | 160 } |
161 | |
162 | |
163 static char * | |
164 ngx_http_empty_gif(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
165 { | |
166 ngx_http_core_loc_conf_t *clcf; | |
167 | |
168 clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module); | |
169 clcf->handler = ngx_http_empty_gif_handler; | |
170 | |
171 return NGX_CONF_OK; | |
172 } |