Mercurial > hg > ngx_http_gunzip_filter_module
comparison ngx_http_gunzip_filter_module.c @ 0:a75d4ad9c5d2
Gunzip filter module.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Sun, 13 Dec 2009 00:24:03 +0300 |
parents | |
children | 0dd7d109e56b |
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-1:000000000000 | 0:a75d4ad9c5d2 |
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1 | |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 * Copyright (C) Maxim Dounin | |
5 */ | |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 #include <ngx_http.h> | |
11 #include <nginx.h> | |
12 | |
13 #include <zlib.h> | |
14 | |
15 | |
16 typedef struct { | |
17 ngx_flag_t enable; | |
18 ngx_bufs_t bufs; | |
19 } ngx_http_gunzip_conf_t; | |
20 | |
21 | |
22 typedef struct { | |
23 ngx_chain_t *in; | |
24 ngx_chain_t *free; | |
25 ngx_chain_t *busy; | |
26 ngx_chain_t *out; | |
27 ngx_chain_t **last_out; | |
28 | |
29 ngx_buf_t *in_buf; | |
30 ngx_buf_t *out_buf; | |
31 ngx_int_t bufs; | |
32 | |
33 unsigned started:1; | |
34 unsigned flush:4; | |
35 unsigned redo:1; | |
36 unsigned done:1; | |
37 unsigned nomem:1; | |
38 | |
39 z_stream zstream; | |
40 ngx_http_request_t *request; | |
41 } ngx_http_gunzip_ctx_t; | |
42 | |
43 | |
44 static ngx_int_t ngx_http_gunzip_filter_inflate_start(ngx_http_request_t *r, | |
45 ngx_http_gunzip_ctx_t *ctx); | |
46 static ngx_int_t ngx_http_gunzip_filter_add_data(ngx_http_request_t *r, | |
47 ngx_http_gunzip_ctx_t *ctx); | |
48 static ngx_int_t ngx_http_gunzip_filter_get_buf(ngx_http_request_t *r, | |
49 ngx_http_gunzip_ctx_t *ctx); | |
50 static ngx_int_t ngx_http_gunzip_filter_inflate(ngx_http_request_t *r, | |
51 ngx_http_gunzip_ctx_t *ctx); | |
52 static ngx_int_t ngx_http_gunzip_filter_inflate_end(ngx_http_request_t *r, | |
53 ngx_http_gunzip_ctx_t *ctx); | |
54 | |
55 static void *ngx_http_gunzip_filter_alloc(void *opaque, u_int items, | |
56 u_int size); | |
57 static void ngx_http_gunzip_filter_free(void *opaque, void *address); | |
58 | |
59 static ngx_int_t ngx_http_gunzip_filter_init(ngx_conf_t *cf); | |
60 static void *ngx_http_gunzip_create_conf(ngx_conf_t *cf); | |
61 static char *ngx_http_gunzip_merge_conf(ngx_conf_t *cf, | |
62 void *parent, void *child); | |
63 | |
64 | |
65 static ngx_command_t ngx_http_gunzip_filter_commands[] = { | |
66 | |
67 { ngx_string("gunzip"), | |
68 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, | |
69 ngx_conf_set_flag_slot, | |
70 NGX_HTTP_LOC_CONF_OFFSET, | |
71 offsetof(ngx_http_gunzip_conf_t, enable), | |
72 NULL }, | |
73 | |
74 { ngx_string("gunzip_buffers"), | |
75 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2, | |
76 ngx_conf_set_bufs_slot, | |
77 NGX_HTTP_LOC_CONF_OFFSET, | |
78 offsetof(ngx_http_gunzip_conf_t, bufs), | |
79 NULL }, | |
80 | |
81 ngx_null_command | |
82 }; | |
83 | |
84 | |
85 static ngx_http_module_t ngx_http_gunzip_filter_module_ctx = { | |
86 NULL, /* preconfiguration */ | |
87 ngx_http_gunzip_filter_init, /* postconfiguration */ | |
88 | |
89 NULL, /* create main configuration */ | |
90 NULL, /* init main configuration */ | |
91 | |
92 NULL, /* create server configuration */ | |
93 NULL, /* merge server configuration */ | |
94 | |
95 ngx_http_gunzip_create_conf, /* create location configuration */ | |
96 ngx_http_gunzip_merge_conf /* merge location configuration */ | |
97 }; | |
98 | |
99 | |
100 ngx_module_t ngx_http_gunzip_filter_module = { | |
101 NGX_MODULE_V1, | |
102 &ngx_http_gunzip_filter_module_ctx, /* module context */ | |
103 ngx_http_gunzip_filter_commands, /* module directives */ | |
104 NGX_HTTP_MODULE, /* module type */ | |
105 NULL, /* init master */ | |
106 NULL, /* init module */ | |
107 NULL, /* init process */ | |
108 NULL, /* init thread */ | |
109 NULL, /* exit thread */ | |
110 NULL, /* exit process */ | |
111 NULL, /* exit master */ | |
112 NGX_MODULE_V1_PADDING | |
113 }; | |
114 | |
115 | |
116 static ngx_http_output_header_filter_pt ngx_http_next_header_filter; | |
117 static ngx_http_output_body_filter_pt ngx_http_next_body_filter; | |
118 | |
119 | |
120 static ngx_int_t | |
121 ngx_http_gunzip_header_filter(ngx_http_request_t *r) | |
122 { | |
123 ngx_http_gunzip_ctx_t *ctx; | |
124 ngx_http_gunzip_conf_t *conf; | |
125 | |
126 conf = ngx_http_get_module_loc_conf(r, ngx_http_gunzip_filter_module); | |
127 | |
128 /* TODO support multiple content-codings */ | |
129 | |
130 if (!conf->enable | |
131 || r->headers_out.content_encoding == NULL | |
132 || r->headers_out.content_encoding->value.len != 4 | |
133 || ngx_strncasecmp(r->headers_out.content_encoding->value.data, | |
134 (u_char *) "gzip", 4) != 0) | |
135 { | |
136 return ngx_http_next_header_filter(r); | |
137 } | |
138 | |
139 #if (nginx_version >= 8025) | |
140 | |
141 r->gzip_vary = 1; | |
142 | |
143 if (!r->gzip_tested) { | |
144 if (ngx_http_gzip_ok(r) == NGX_OK) { | |
145 return ngx_http_next_header_filter(r); | |
146 } | |
147 | |
148 } else if (!r->gzip_ok) { | |
149 return ngx_http_next_header_filter(r); | |
150 } | |
151 | |
152 #else | |
153 | |
154 if (ngx_http_gzip_ok(r) == NGX_OK) { | |
155 return ngx_http_next_header_filter(r); | |
156 } | |
157 | |
158 #endif | |
159 | |
160 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_gunzip_ctx_t)); | |
161 if (ctx == NULL) { | |
162 return NGX_ERROR; | |
163 } | |
164 | |
165 ngx_http_set_ctx(r, ctx, ngx_http_gunzip_filter_module); | |
166 | |
167 ctx->request = r; | |
168 | |
169 r->filter_need_in_memory = 1; | |
170 | |
171 r->headers_out.content_encoding->hash = 0; | |
172 r->headers_out.content_encoding = NULL; | |
173 | |
174 ngx_http_clear_content_length(r); | |
175 ngx_http_clear_accept_ranges(r); | |
176 | |
177 return ngx_http_next_header_filter(r); | |
178 } | |
179 | |
180 | |
181 static ngx_int_t | |
182 ngx_http_gunzip_body_filter(ngx_http_request_t *r, ngx_chain_t *in) | |
183 { | |
184 int rc; | |
185 ngx_chain_t *cl; | |
186 ngx_http_gunzip_ctx_t *ctx; | |
187 | |
188 ctx = ngx_http_get_module_ctx(r, ngx_http_gunzip_filter_module); | |
189 | |
190 if (ctx == NULL || ctx->done) { | |
191 return ngx_http_next_body_filter(r, in); | |
192 } | |
193 | |
194 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
195 "http gunzip filter"); | |
196 | |
197 if (!ctx->started) { | |
198 if (ngx_http_gunzip_filter_inflate_start(r, ctx) != NGX_OK) { | |
199 goto failed; | |
200 } | |
201 } | |
202 | |
203 if (in) { | |
204 if (ngx_chain_add_copy(r->pool, &ctx->in, in) != NGX_OK) { | |
205 goto failed; | |
206 } | |
207 } | |
208 | |
209 if (ctx->nomem) { | |
210 | |
211 /* flush busy buffers */ | |
212 | |
213 if (ngx_http_next_body_filter(r, NULL) == NGX_ERROR) { | |
214 goto failed; | |
215 } | |
216 | |
217 cl = NULL; | |
218 | |
219 ngx_chain_update_chains(&ctx->free, &ctx->busy, &cl, | |
220 (ngx_buf_tag_t) &ngx_http_gunzip_filter_module); | |
221 ctx->nomem = 0; | |
222 } | |
223 | |
224 for ( ;; ) { | |
225 | |
226 /* cycle while we can write to a client */ | |
227 | |
228 for ( ;; ) { | |
229 | |
230 /* cycle while there is data to feed zlib and ... */ | |
231 | |
232 rc = ngx_http_gunzip_filter_add_data(r, ctx); | |
233 | |
234 if (rc == NGX_DECLINED) { | |
235 break; | |
236 } | |
237 | |
238 if (rc == NGX_AGAIN) { | |
239 continue; | |
240 } | |
241 | |
242 | |
243 /* ... there are buffers to write zlib output */ | |
244 | |
245 rc = ngx_http_gunzip_filter_get_buf(r, ctx); | |
246 | |
247 if (rc == NGX_DECLINED) { | |
248 break; | |
249 } | |
250 | |
251 if (rc == NGX_ERROR) { | |
252 goto failed; | |
253 } | |
254 | |
255 rc = ngx_http_gunzip_filter_inflate(r, ctx); | |
256 | |
257 if (rc == NGX_OK) { | |
258 break; | |
259 } | |
260 | |
261 if (rc == NGX_ERROR) { | |
262 goto failed; | |
263 } | |
264 | |
265 /* rc == NGX_AGAIN */ | |
266 } | |
267 | |
268 if (ctx->out == NULL) { | |
269 return ctx->busy ? NGX_AGAIN : NGX_OK; | |
270 } | |
271 | |
272 rc = ngx_http_next_body_filter(r, ctx->out); | |
273 | |
274 if (rc == NGX_ERROR) { | |
275 goto failed; | |
276 } | |
277 | |
278 ngx_chain_update_chains(&ctx->free, &ctx->busy, &ctx->out, | |
279 (ngx_buf_tag_t) &ngx_http_gunzip_filter_module); | |
280 ctx->last_out = &ctx->out; | |
281 | |
282 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
283 "gunzip out: %p", ctx->out); | |
284 | |
285 ctx->nomem = 0; | |
286 | |
287 if (ctx->done) { | |
288 return rc; | |
289 } | |
290 } | |
291 | |
292 /* unreachable */ | |
293 | |
294 failed: | |
295 | |
296 ctx->done = 1; | |
297 | |
298 return NGX_ERROR; | |
299 } | |
300 | |
301 | |
302 static ngx_int_t | |
303 ngx_http_gunzip_filter_inflate_start(ngx_http_request_t *r, | |
304 ngx_http_gunzip_ctx_t *ctx) | |
305 { | |
306 int rc; | |
307 | |
308 ctx->zstream.next_in = Z_NULL; | |
309 ctx->zstream.avail_in = 0; | |
310 | |
311 ctx->zstream.zalloc = ngx_http_gunzip_filter_alloc; | |
312 ctx->zstream.zfree = ngx_http_gunzip_filter_free; | |
313 ctx->zstream.opaque = ctx; | |
314 | |
315 /* windowBits +16 to decode gzip, zlib 1.2.0.4+ */ | |
316 rc = inflateInit2(&ctx->zstream, MAX_WBITS + 16); | |
317 | |
318 if (rc != Z_OK) { | |
319 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, | |
320 "inflateInit2() failed: %d", rc); | |
321 return NGX_ERROR; | |
322 } | |
323 | |
324 ctx->started = 1; | |
325 | |
326 ctx->last_out = &ctx->out; | |
327 ctx->flush = Z_NO_FLUSH; | |
328 | |
329 return NGX_OK; | |
330 } | |
331 | |
332 | |
333 static ngx_int_t | |
334 ngx_http_gunzip_filter_add_data(ngx_http_request_t *r, | |
335 ngx_http_gunzip_ctx_t *ctx) | |
336 { | |
337 if (ctx->zstream.avail_in || ctx->flush != Z_NO_FLUSH || ctx->redo) { | |
338 return NGX_OK; | |
339 } | |
340 | |
341 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
342 "gunzip in: %p", ctx->in); | |
343 | |
344 if (ctx->in == NULL) { | |
345 return NGX_DECLINED; | |
346 } | |
347 | |
348 ctx->in_buf = ctx->in->buf; | |
349 ctx->in = ctx->in->next; | |
350 | |
351 ctx->zstream.next_in = ctx->in_buf->pos; | |
352 ctx->zstream.avail_in = ctx->in_buf->last - ctx->in_buf->pos; | |
353 | |
354 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
355 "gunzip in_buf:%p ni:%p ai:%ud", | |
356 ctx->in_buf, | |
357 ctx->zstream.next_in, ctx->zstream.avail_in); | |
358 | |
359 if (ctx->in_buf->last_buf || ctx->in_buf->last_in_chain) { | |
360 ctx->flush = Z_FINISH; | |
361 | |
362 } else if (ctx->in_buf->flush) { | |
363 ctx->flush = Z_SYNC_FLUSH; | |
364 | |
365 } else if (ctx->zstream.avail_in == 0) { | |
366 /* ctx->flush == Z_NO_FLUSH */ | |
367 return NGX_AGAIN; | |
368 } | |
369 | |
370 return NGX_OK; | |
371 } | |
372 | |
373 | |
374 static ngx_int_t | |
375 ngx_http_gunzip_filter_get_buf(ngx_http_request_t *r, | |
376 ngx_http_gunzip_ctx_t *ctx) | |
377 { | |
378 ngx_http_gunzip_conf_t *conf; | |
379 | |
380 if (ctx->zstream.avail_out) { | |
381 return NGX_OK; | |
382 } | |
383 | |
384 conf = ngx_http_get_module_loc_conf(r, ngx_http_gunzip_filter_module); | |
385 | |
386 if (ctx->free) { | |
387 ctx->out_buf = ctx->free->buf; | |
388 ctx->free = ctx->free->next; | |
389 | |
390 ctx->out_buf->flush = 0; | |
391 | |
392 } else if (ctx->bufs < conf->bufs.num) { | |
393 | |
394 ctx->out_buf = ngx_create_temp_buf(r->pool, conf->bufs.size); | |
395 if (ctx->out_buf == NULL) { | |
396 return NGX_ERROR; | |
397 } | |
398 | |
399 ctx->out_buf->tag = (ngx_buf_tag_t) &ngx_http_gunzip_filter_module; | |
400 ctx->out_buf->recycled = 1; | |
401 ctx->bufs++; | |
402 | |
403 } else { | |
404 ctx->nomem = 1; | |
405 return NGX_DECLINED; | |
406 } | |
407 | |
408 ctx->zstream.next_out = ctx->out_buf->pos; | |
409 ctx->zstream.avail_out = conf->bufs.size; | |
410 | |
411 return NGX_OK; | |
412 } | |
413 | |
414 | |
415 static ngx_int_t | |
416 ngx_http_gunzip_filter_inflate(ngx_http_request_t *r, | |
417 ngx_http_gunzip_ctx_t *ctx) | |
418 { | |
419 int rc; | |
420 ngx_buf_t *b; | |
421 ngx_chain_t *cl; | |
422 | |
423 ngx_log_debug6(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
424 "inflate in: ni:%p no:%p ai:%ud ao:%ud fl:%d redo:%d", | |
425 ctx->zstream.next_in, ctx->zstream.next_out, | |
426 ctx->zstream.avail_in, ctx->zstream.avail_out, | |
427 ctx->flush, ctx->redo); | |
428 | |
429 rc = inflate(&ctx->zstream, ctx->flush); | |
430 | |
431 if (rc != Z_OK && rc != Z_STREAM_END && rc != Z_BUF_ERROR) { | |
432 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, | |
433 "inflate() failed: %d, %d", ctx->flush, rc); | |
434 return NGX_ERROR; | |
435 } | |
436 | |
437 ngx_log_debug5(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
438 "inflate out: ni:%p no:%p ai:%ud ao:%ud rc:%d", | |
439 ctx->zstream.next_in, ctx->zstream.next_out, | |
440 ctx->zstream.avail_in, ctx->zstream.avail_out, | |
441 rc); | |
442 | |
443 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
444 "gunzip in_buf:%p pos:%p", | |
445 ctx->in_buf, ctx->in_buf->pos); | |
446 | |
447 if (ctx->zstream.next_in) { | |
448 ctx->in_buf->pos = ctx->zstream.next_in; | |
449 | |
450 if (ctx->zstream.avail_in == 0) { | |
451 ctx->zstream.next_in = NULL; | |
452 } | |
453 } | |
454 | |
455 ctx->out_buf->last = ctx->zstream.next_out; | |
456 | |
457 if (ctx->zstream.avail_out == 0) { | |
458 | |
459 /* zlib wants to output some more data */ | |
460 | |
461 cl = ngx_alloc_chain_link(r->pool); | |
462 if (cl == NULL) { | |
463 return NGX_ERROR; | |
464 } | |
465 | |
466 cl->buf = ctx->out_buf; | |
467 cl->next = NULL; | |
468 *ctx->last_out = cl; | |
469 ctx->last_out = &cl->next; | |
470 | |
471 ctx->redo = 1; | |
472 | |
473 return NGX_AGAIN; | |
474 } | |
475 | |
476 ctx->redo = 0; | |
477 | |
478 if (ctx->flush == Z_SYNC_FLUSH) { | |
479 | |
480 ctx->flush = Z_NO_FLUSH; | |
481 | |
482 cl = ngx_alloc_chain_link(r->pool); | |
483 if (cl == NULL) { | |
484 return NGX_ERROR; | |
485 } | |
486 | |
487 b = ctx->out_buf; | |
488 | |
489 if (ngx_buf_size(b) == 0) { | |
490 | |
491 b = ngx_calloc_buf(ctx->request->pool); | |
492 if (b == NULL) { | |
493 return NGX_ERROR; | |
494 } | |
495 | |
496 } else { | |
497 ctx->zstream.avail_out = 0; | |
498 } | |
499 | |
500 b->flush = 1; | |
501 | |
502 cl->buf = b; | |
503 cl->next = NULL; | |
504 *ctx->last_out = cl; | |
505 ctx->last_out = &cl->next; | |
506 | |
507 return NGX_OK; | |
508 } | |
509 | |
510 if (rc == Z_STREAM_END && ctx->flush == Z_FINISH | |
511 && ctx->zstream.avail_in == 0) | |
512 { | |
513 | |
514 if (ngx_http_gunzip_filter_inflate_end(r, ctx) != NGX_OK) { | |
515 return NGX_ERROR; | |
516 } | |
517 | |
518 return NGX_OK; | |
519 } | |
520 | |
521 if (rc == Z_STREAM_END && ctx->zstream.avail_in > 0) { | |
522 | |
523 rc = inflateReset(&ctx->zstream); | |
524 | |
525 if (rc != Z_OK) { | |
526 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, | |
527 "inflateReset() failed: %d", rc); | |
528 return NGX_ERROR; | |
529 } | |
530 | |
531 ctx->redo = 1; | |
532 | |
533 return NGX_AGAIN; | |
534 } | |
535 | |
536 if (ctx->in == NULL) { | |
537 | |
538 cl = ngx_alloc_chain_link(r->pool); | |
539 if (cl == NULL) { | |
540 return NGX_ERROR; | |
541 } | |
542 | |
543 b = ctx->out_buf; | |
544 | |
545 if (ngx_buf_size(b) == 0) { | |
546 | |
547 b = ngx_calloc_buf(ctx->request->pool); | |
548 if (b == NULL) { | |
549 return NGX_ERROR; | |
550 } | |
551 | |
552 } else { | |
553 ctx->zstream.avail_out = 0; | |
554 } | |
555 | |
556 cl->buf = b; | |
557 cl->next = NULL; | |
558 *ctx->last_out = cl; | |
559 ctx->last_out = &cl->next; | |
560 | |
561 return NGX_OK; | |
562 } | |
563 | |
564 return NGX_AGAIN; | |
565 } | |
566 | |
567 | |
568 static ngx_int_t | |
569 ngx_http_gunzip_filter_inflate_end(ngx_http_request_t *r, | |
570 ngx_http_gunzip_ctx_t *ctx) | |
571 { | |
572 int rc; | |
573 ngx_buf_t *b; | |
574 ngx_chain_t *cl; | |
575 | |
576 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
577 "gunzip inflate end"); | |
578 | |
579 rc = inflateEnd(&ctx->zstream); | |
580 | |
581 if (rc != Z_OK) { | |
582 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, | |
583 "inflateEnd() failed: %d", rc); | |
584 return NGX_ERROR; | |
585 } | |
586 | |
587 b = ctx->out_buf; | |
588 | |
589 if (ngx_buf_size(b) == 0) { | |
590 | |
591 b = ngx_calloc_buf(ctx->request->pool); | |
592 if (b == NULL) { | |
593 return NGX_ERROR; | |
594 } | |
595 } | |
596 | |
597 cl = ngx_alloc_chain_link(r->pool); | |
598 if (cl == NULL) { | |
599 return NGX_ERROR; | |
600 } | |
601 | |
602 cl->buf = b; | |
603 cl->next = NULL; | |
604 *ctx->last_out = cl; | |
605 ctx->last_out = &cl->next; | |
606 | |
607 b->last_buf = (r == r->main) ? 1 : 0; | |
608 b->last_in_chain = 1; | |
609 b->sync = 1; | |
610 | |
611 ctx->done = 1; | |
612 | |
613 return NGX_OK; | |
614 } | |
615 | |
616 | |
617 static void * | |
618 ngx_http_gunzip_filter_alloc(void *opaque, u_int items, u_int size) | |
619 { | |
620 ngx_http_gunzip_ctx_t *ctx = opaque; | |
621 | |
622 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0, | |
623 "gunzip alloc: n:%ud s:%ud", | |
624 items, size); | |
625 | |
626 return ngx_palloc(ctx->request->pool, items * size); | |
627 } | |
628 | |
629 | |
630 static void | |
631 ngx_http_gunzip_filter_free(void *opaque, void *address) | |
632 { | |
633 #if 0 | |
634 ngx_http_gunzip_ctx_t *ctx = opaque; | |
635 | |
636 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0, | |
637 "gunzip free: %p", address); | |
638 #endif | |
639 } | |
640 | |
641 | |
642 static void * | |
643 ngx_http_gunzip_create_conf(ngx_conf_t *cf) | |
644 { | |
645 ngx_http_gunzip_conf_t *conf; | |
646 | |
647 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_gunzip_conf_t)); | |
648 if (conf == NULL) { | |
649 return NULL; | |
650 } | |
651 | |
652 /* | |
653 * set by ngx_pcalloc(): | |
654 * | |
655 * conf->bufs.num = 0; | |
656 */ | |
657 | |
658 conf->enable = NGX_CONF_UNSET; | |
659 | |
660 return conf; | |
661 } | |
662 | |
663 | |
664 static char * | |
665 ngx_http_gunzip_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
666 { | |
667 ngx_http_gunzip_conf_t *prev = parent; | |
668 ngx_http_gunzip_conf_t *conf = child; | |
669 | |
670 ngx_conf_merge_value(conf->enable, prev->enable, 0); | |
671 | |
672 ngx_conf_merge_bufs_value(conf->bufs, prev->bufs, | |
673 (128 * 1024) / ngx_pagesize, ngx_pagesize); | |
674 | |
675 return NGX_CONF_OK; | |
676 } | |
677 | |
678 | |
679 static ngx_int_t | |
680 ngx_http_gunzip_filter_init(ngx_conf_t *cf) | |
681 { | |
682 ngx_http_next_header_filter = ngx_http_top_header_filter; | |
683 ngx_http_top_header_filter = ngx_http_gunzip_header_filter; | |
684 | |
685 ngx_http_next_body_filter = ngx_http_top_body_filter; | |
686 ngx_http_top_body_filter = ngx_http_gunzip_body_filter; | |
687 | |
688 return NGX_OK; | |
689 } |