Mercurial > hg > nginx
annotate src/http/modules/ngx_http_image_filter_module.c @ 2848:0d8941f2b0ee
image_filter_jpeg_quality
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Sat, 16 May 2009 16:57:11 +0000 |
| parents | 0449d289256c |
| children | 896db5a09bd2 |
| rev | line source |
|---|---|
| 2788 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4 */ | |
| 5 | |
| 6 | |
| 7 #include <ngx_config.h> | |
| 8 #include <ngx_core.h> | |
| 9 #include <ngx_http.h> | |
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10 |
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11 #include <gd.h> |
| 2788 | 12 |
| 13 | |
| 14 #define NGX_HTTP_IMAGE_OFF 0 | |
| 15 #define NGX_HTTP_IMAGE_TEST 1 | |
| 16 #define NGX_HTTP_IMAGE_SIZE 2 | |
| 17 #define NGX_HTTP_IMAGE_RESIZE 3 | |
| 18 #define NGX_HTTP_IMAGE_CROP 4 | |
| 19 | |
| 20 | |
| 21 #define NGX_HTTP_IMAGE_START 0 | |
| 22 #define NGX_HTTP_IMAGE_READ 1 | |
| 23 #define NGX_HTTP_IMAGE_PROCESS 2 | |
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24 #define NGX_HTTP_IMAGE_PASS 3 |
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25 #define NGX_HTTP_IMAGE_DONE 4 |
| 2788 | 26 |
| 27 | |
| 28 #define NGX_HTTP_IMAGE_NONE 0 | |
| 29 #define NGX_HTTP_IMAGE_JPEG 1 | |
| 30 #define NGX_HTTP_IMAGE_GIF 2 | |
| 31 #define NGX_HTTP_IMAGE_PNG 3 | |
| 32 | |
| 33 | |
| 34 #define NGX_HTTP_IMAGE_BUFFERED 0x08 | |
| 35 | |
| 36 | |
| 37 typedef struct { | |
| 38 ngx_uint_t filter; | |
| 39 ngx_uint_t width; | |
| 40 ngx_uint_t height; | |
| 2848 | 41 ngx_int_t jpeg_quality; |
| 2788 | 42 |
| 43 size_t buffer_size; | |
| 44 } ngx_http_image_filter_conf_t; | |
| 45 | |
| 46 | |
| 47 typedef struct { | |
| 48 u_char *image; | |
| 49 u_char *last; | |
| 50 | |
| 51 size_t length; | |
| 52 | |
| 53 ngx_uint_t width; | |
| 54 ngx_uint_t height; | |
| 55 | |
| 56 ngx_uint_t phase; | |
| 57 ngx_uint_t type; | |
| 58 } ngx_http_image_filter_ctx_t; | |
| 59 | |
| 60 | |
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61 static ngx_int_t ngx_http_image_send(ngx_http_request_t *r, |
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62 ngx_http_image_filter_ctx_t *ctx, ngx_chain_t *in); |
| 2788 | 63 static ngx_uint_t ngx_http_image_test(ngx_http_request_t *r, ngx_chain_t *in); |
| 64 static ngx_int_t ngx_http_image_read(ngx_http_request_t *r, ngx_chain_t *in); | |
| 65 static ngx_buf_t *ngx_http_image_process(ngx_http_request_t *r); | |
| 66 static ngx_buf_t *ngx_http_image_json(ngx_http_request_t *r, | |
| 67 ngx_http_image_filter_ctx_t *ctx); | |
| 68 static ngx_buf_t *ngx_http_image_asis(ngx_http_request_t *r, | |
| 69 ngx_http_image_filter_ctx_t *ctx); | |
| 70 static void ngx_http_image_length(ngx_http_request_t *r, ngx_buf_t *b); | |
| 71 static ngx_int_t ngx_http_image_size(ngx_http_request_t *r, | |
| 72 ngx_http_image_filter_ctx_t *ctx); | |
| 73 | |
| 74 static ngx_buf_t *ngx_http_image_resize(ngx_http_request_t *r, | |
| 75 ngx_http_image_filter_ctx_t *ctx); | |
| 76 static gdImagePtr ngx_http_image_source(ngx_http_request_t *r, | |
| 77 ngx_http_image_filter_ctx_t *ctx); | |
| 78 static gdImagePtr ngx_http_image_new(ngx_http_request_t *r, int w, int h, | |
| 79 int colors); | |
| 80 static u_char *ngx_http_image_out(ngx_http_request_t *r, ngx_uint_t type, | |
| 81 gdImagePtr img, int *size); | |
| 82 static void ngx_http_image_cleanup(void *data); | |
| 83 | |
| 84 | |
| 85 static void *ngx_http_image_filter_create_conf(ngx_conf_t *cf); | |
| 86 static char *ngx_http_image_filter_merge_conf(ngx_conf_t *cf, void *parent, | |
| 87 void *child); | |
| 88 static char *ngx_http_image_filter(ngx_conf_t *cf, ngx_command_t *cmd, | |
| 89 void *conf); | |
| 90 static ngx_int_t ngx_http_image_filter_init(ngx_conf_t *cf); | |
| 91 | |
| 92 | |
| 93 static ngx_command_t ngx_http_image_filter_commands[] = { | |
| 94 | |
| 95 { ngx_string("image_filter"), | |
| 96 NGX_HTTP_LOC_CONF|NGX_CONF_TAKE13, | |
| 97 ngx_http_image_filter, | |
| 98 NGX_HTTP_LOC_CONF_OFFSET, | |
| 99 0, | |
| 100 NULL }, | |
| 101 | |
| 2848 | 102 { ngx_string("image_filter_jpeg_quality"), |
| 103 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
| 104 ngx_conf_set_num_slot, | |
| 105 NGX_HTTP_LOC_CONF_OFFSET, | |
| 106 offsetof(ngx_http_image_filter_conf_t, jpeg_quality), | |
| 107 NULL }, | |
| 108 | |
| 2788 | 109 { ngx_string("image_filter_buffer"), |
| 110 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
| 111 ngx_conf_set_size_slot, | |
| 112 NGX_HTTP_LOC_CONF_OFFSET, | |
| 113 offsetof(ngx_http_image_filter_conf_t, buffer_size), | |
| 114 NULL }, | |
| 115 | |
| 116 ngx_null_command | |
| 117 }; | |
| 118 | |
| 119 | |
| 120 static ngx_http_module_t ngx_http_image_filter_module_ctx = { | |
| 121 NULL, /* preconfiguration */ | |
| 122 ngx_http_image_filter_init, /* postconfiguration */ | |
| 123 | |
| 124 NULL, /* create main configuration */ | |
| 125 NULL, /* init main configuration */ | |
| 126 | |
| 127 NULL, /* create server configuration */ | |
| 128 NULL, /* merge server configuration */ | |
| 129 | |
| 130 ngx_http_image_filter_create_conf, /* create location configuration */ | |
| 131 ngx_http_image_filter_merge_conf /* merge location configuration */ | |
| 132 }; | |
| 133 | |
| 134 | |
| 135 ngx_module_t ngx_http_image_filter_module = { | |
| 136 NGX_MODULE_V1, | |
| 137 &ngx_http_image_filter_module_ctx, /* module context */ | |
| 138 ngx_http_image_filter_commands, /* module directives */ | |
| 139 NGX_HTTP_MODULE, /* module type */ | |
| 140 NULL, /* init master */ | |
| 141 NULL, /* init module */ | |
| 142 NULL, /* init process */ | |
| 143 NULL, /* init thread */ | |
| 144 NULL, /* exit thread */ | |
| 145 NULL, /* exit process */ | |
| 146 NULL, /* exit master */ | |
| 147 NGX_MODULE_V1_PADDING | |
| 148 }; | |
| 149 | |
| 150 | |
| 151 static ngx_http_output_header_filter_pt ngx_http_next_header_filter; | |
| 152 static ngx_http_output_body_filter_pt ngx_http_next_body_filter; | |
| 153 | |
| 154 | |
| 155 static ngx_str_t ngx_http_image_types[] = { | |
| 156 ngx_string("image/jpeg"), | |
| 157 ngx_string("image/gif"), | |
| 158 ngx_string("image/png") | |
| 159 }; | |
| 160 | |
| 161 | |
| 162 static ngx_int_t | |
| 163 ngx_http_image_header_filter(ngx_http_request_t *r) | |
| 164 { | |
| 165 off_t len; | |
| 166 ngx_http_image_filter_ctx_t *ctx; | |
| 167 ngx_http_image_filter_conf_t *conf; | |
| 168 | |
| 169 if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED) { | |
| 170 return ngx_http_next_header_filter(r); | |
| 171 } | |
| 172 | |
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173 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); |
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174 |
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175 if (ctx) { |
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176 ngx_http_set_ctx(r, NULL, ngx_http_image_filter_module); |
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177 return ngx_http_next_header_filter(r); |
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178 } |
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179 |
| 2788 | 180 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); |
| 181 | |
| 182 if (conf->filter == NGX_HTTP_IMAGE_OFF) { | |
| 183 return ngx_http_next_header_filter(r); | |
| 184 } | |
| 185 | |
| 186 if (r->headers_out.content_type.len | |
| 187 >= sizeof("multipart/x-mixed-replace") - 1 | |
| 188 && ngx_strncasecmp(r->headers_out.content_type.data, | |
| 189 (u_char *) "multipart/x-mixed-replace", | |
| 190 sizeof("multipart/x-mixed-replace") - 1) | |
| 191 == 0) | |
| 192 { | |
| 193 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 194 "image filter: multipart/x-mixed-replace response"); | |
| 195 | |
| 196 return NGX_ERROR; | |
| 197 } | |
| 198 | |
| 199 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_image_filter_ctx_t)); | |
| 200 if (ctx == NULL) { | |
| 201 return NGX_ERROR; | |
| 202 } | |
| 203 | |
| 204 ngx_http_set_ctx(r, ctx, ngx_http_image_filter_module); | |
| 205 | |
| 206 len = r->headers_out.content_length_n; | |
| 207 | |
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208 if (len != -1 && len > (off_t) conf->buffer_size) { |
| 2788 | 209 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
| 210 "image filter: too big response: %O", len); | |
| 211 | |
| 212 return NGX_ERROR; | |
| 213 } | |
| 214 | |
| 215 if (len == -1) { | |
| 216 ctx->length = conf->buffer_size; | |
| 217 | |
| 218 } else { | |
| 219 ctx->length = (size_t) len; | |
| 220 } | |
| 221 | |
| 222 if (r->headers_out.refresh) { | |
| 223 r->headers_out.refresh->hash = 0; | |
| 224 } | |
| 225 | |
| 226 r->main_filter_need_in_memory = 1; | |
| 227 r->allow_ranges = 0; | |
| 228 | |
| 229 return NGX_OK; | |
| 230 } | |
| 231 | |
| 232 | |
| 233 static ngx_int_t | |
| 234 ngx_http_image_body_filter(ngx_http_request_t *r, ngx_chain_t *in) | |
| 235 { | |
| 236 ngx_int_t rc; | |
| 237 ngx_str_t *ct; | |
| 238 ngx_chain_t out; | |
| 239 ngx_http_image_filter_ctx_t *ctx; | |
| 240 ngx_http_image_filter_conf_t *conf; | |
| 241 | |
| 242 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "image filter"); | |
| 243 | |
| 244 if (in == NULL) { | |
| 245 return ngx_http_next_body_filter(r, in); | |
| 246 } | |
| 247 | |
| 248 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); | |
| 249 | |
| 250 if (ctx == NULL) { | |
| 251 return ngx_http_next_body_filter(r, in); | |
| 252 } | |
| 253 | |
| 254 switch (ctx->phase) { | |
| 255 | |
| 256 case NGX_HTTP_IMAGE_START: | |
| 257 | |
| 258 ctx->type = ngx_http_image_test(r, in); | |
| 259 | |
| 260 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); | |
| 261 | |
| 262 if (ctx->type == NGX_HTTP_IMAGE_NONE) { | |
| 263 | |
| 264 if (conf->filter == NGX_HTTP_IMAGE_SIZE) { | |
| 265 out.buf = ngx_http_image_json(r, NULL); | |
| 266 | |
| 267 if (out.buf) { | |
| 268 out.next = NULL; | |
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269 ctx->phase = NGX_HTTP_IMAGE_DONE; |
| 2788 | 270 |
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271 return ngx_http_image_send(r, ctx, &out); |
| 2788 | 272 } |
| 273 } | |
| 274 | |
| 275 return ngx_http_filter_finalize_request(r, | |
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276 &ngx_http_image_filter_module, |
| 2788 | 277 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE); |
| 278 } | |
| 279 | |
| 280 /* override content type */ | |
| 281 | |
| 282 ct = &ngx_http_image_types[ctx->type - 1]; | |
| 283 r->headers_out.content_type_len = ct->len; | |
| 284 r->headers_out.content_type = *ct; | |
| 285 | |
| 286 if (conf->filter == NGX_HTTP_IMAGE_TEST) { | |
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287 ctx->phase = NGX_HTTP_IMAGE_PASS; |
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288 |
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289 return ngx_http_image_send(r, ctx, in); |
| 2788 | 290 } |
| 291 | |
| 292 ctx->phase = NGX_HTTP_IMAGE_READ; | |
| 293 | |
| 294 /* fall through */ | |
| 295 | |
| 296 case NGX_HTTP_IMAGE_READ: | |
| 297 | |
| 298 rc = ngx_http_image_read(r, in); | |
| 299 | |
| 300 if (rc == NGX_AGAIN) { | |
| 301 return NGX_OK; | |
| 302 } | |
| 303 | |
| 304 if (rc == NGX_ERROR) { | |
| 305 return ngx_http_filter_finalize_request(r, | |
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306 &ngx_http_image_filter_module, |
| 2788 | 307 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE); |
| 308 } | |
| 309 | |
| 310 /* fall through */ | |
| 311 | |
| 312 case NGX_HTTP_IMAGE_PROCESS: | |
| 313 | |
| 314 out.buf = ngx_http_image_process(r); | |
| 315 | |
| 316 if (out.buf == NULL) { | |
| 317 return ngx_http_filter_finalize_request(r, | |
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318 &ngx_http_image_filter_module, |
| 2788 | 319 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE); |
| 320 } | |
| 321 | |
| 322 out.next = NULL; | |
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323 ctx->phase = NGX_HTTP_IMAGE_PASS; |
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324 |
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325 return ngx_http_image_send(r, ctx, &out); |
| 2788 | 326 |
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327 case NGX_HTTP_IMAGE_PASS: |
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328 |
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329 return ngx_http_next_body_filter(r, in); |
| 2788 | 330 |
| 331 default: /* NGX_HTTP_IMAGE_DONE */ | |
| 332 | |
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333 rc = ngx_http_next_body_filter(r, NULL); |
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334 |
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335 /* NGX_ERROR resets any pending data */ |
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336 return (rc == NGX_OK) ? NGX_ERROR : rc; |
| 2788 | 337 } |
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338 } |
| 2788 | 339 |
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340 |
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341 static ngx_int_t |
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342 ngx_http_image_send(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx, |
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343 ngx_chain_t *in) |
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344 { |
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345 ngx_int_t rc; |
| 2788 | 346 |
| 347 rc = ngx_http_next_header_filter(r); | |
| 348 | |
| 349 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) { | |
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350 return NGX_ERROR; |
| 2788 | 351 } |
| 352 | |
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353 rc = ngx_http_next_body_filter(r, in); |
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354 |
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355 if (ctx->phase == NGX_HTTP_IMAGE_DONE) { |
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356 /* NGX_ERROR resets any pending data */ |
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357 return (rc == NGX_OK) ? NGX_ERROR : rc; |
|
43fe53832da7
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Igor Sysoev <igor@sysoev.ru>
parents:
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changeset
|
358 } |
|
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Igor Sysoev <igor@sysoev.ru>
parents:
2795
diff
changeset
|
359 |
|
43fe53832da7
handle big responses for "size" and "test" image_filters
Igor Sysoev <igor@sysoev.ru>
parents:
2795
diff
changeset
|
360 return rc; |
| 2788 | 361 } |
| 362 | |
| 363 | |
| 364 static ngx_uint_t | |
| 365 ngx_http_image_test(ngx_http_request_t *r, ngx_chain_t *in) | |
| 366 { | |
| 367 u_char *p; | |
| 368 | |
| 369 p = in->buf->pos; | |
| 370 | |
| 371 if (in->buf->last - p < 16) { | |
| 372 return NGX_HTTP_IMAGE_NONE; | |
| 373 } | |
| 374 | |
| 375 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 376 "image filter: \"%c%c\"", p[0], p[1]); | |
| 377 | |
| 378 if (p[0] == 0xff && p[1] == 0xd8) { | |
| 379 | |
| 380 /* JPEG */ | |
| 381 | |
| 382 return NGX_HTTP_IMAGE_JPEG; | |
| 383 | |
| 384 } else if (p[0] == 'G' && p[1] == 'I' && p[2] == 'F' && p[3] == '8' | |
| 385 && p[4] == '9' && p[5] == 'a') | |
| 386 { | |
| 387 /* GIF */ | |
| 388 | |
| 389 return NGX_HTTP_IMAGE_GIF; | |
| 390 | |
| 391 } else if (p[0] == 0x89 && p[1] == 'P' && p[2] == 'N' && p[3] == 'G' | |
| 392 && p[4] == 0x0d && p[5] == 0x0a && p[6] == 0x1a && p[7] == 0x0a) | |
| 393 { | |
| 394 /* PNG */ | |
| 395 | |
| 396 return NGX_HTTP_IMAGE_PNG; | |
| 397 } | |
| 398 | |
| 399 return NGX_HTTP_IMAGE_NONE; | |
| 400 } | |
| 401 | |
| 402 | |
| 403 static ngx_int_t | |
| 404 ngx_http_image_read(ngx_http_request_t *r, ngx_chain_t *in) | |
| 405 { | |
| 406 u_char *p; | |
| 407 size_t size, rest; | |
| 408 ngx_buf_t *b; | |
| 409 ngx_chain_t *cl; | |
| 410 ngx_http_image_filter_ctx_t *ctx; | |
| 411 | |
| 412 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); | |
| 413 | |
| 414 if (ctx->image == NULL) { | |
| 415 ctx->image = ngx_palloc(r->pool, ctx->length); | |
| 416 if (ctx->image == NULL) { | |
| 417 return NGX_ERROR; | |
| 418 } | |
| 419 | |
| 420 ctx->last = ctx->image; | |
| 421 } | |
| 422 | |
| 423 p = ctx->last; | |
| 424 | |
| 425 for (cl = in; cl; cl = cl->next) { | |
| 426 | |
| 427 b = cl->buf; | |
| 428 size = b->last - b->pos; | |
| 429 | |
| 430 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 431 "image buf: %uz", size); | |
| 432 | |
| 433 rest = ctx->image + ctx->length - p; | |
| 434 size = (rest < size) ? rest : size; | |
| 435 | |
| 436 p = ngx_cpymem(p, b->pos, size); | |
| 437 b->pos += size; | |
| 438 | |
| 439 if (b->last_buf) { | |
| 440 ctx->last = p; | |
| 441 return NGX_OK; | |
| 442 } | |
| 443 } | |
| 444 | |
| 445 ctx->last = p; | |
| 446 r->connection->buffered |= NGX_HTTP_IMAGE_BUFFERED; | |
| 447 | |
| 448 return NGX_AGAIN; | |
| 449 } | |
| 450 | |
| 451 | |
| 452 static ngx_buf_t * | |
| 453 ngx_http_image_process(ngx_http_request_t *r) | |
| 454 { | |
| 455 ngx_buf_t *b; | |
| 456 ngx_int_t rc; | |
| 457 ngx_http_image_filter_ctx_t *ctx; | |
| 458 ngx_http_image_filter_conf_t *conf; | |
| 459 | |
| 460 r->connection->buffered &= ~NGX_HTTP_IMAGE_BUFFERED; | |
| 461 | |
| 462 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); | |
| 463 | |
| 464 rc = ngx_http_image_size(r, ctx); | |
| 465 | |
| 466 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); | |
| 467 | |
| 468 if (conf->filter == NGX_HTTP_IMAGE_SIZE) { | |
| 469 | |
| 470 b = ngx_http_image_json(r, rc == NGX_OK ? ctx : NULL); | |
| 471 | |
| 472 } else if (rc == NGX_OK | |
| 473 && ctx->width <= conf->width | |
| 474 && ctx->height <= conf->height) | |
| 475 { | |
| 476 b = ngx_http_image_asis(r, ctx); | |
| 477 | |
| 478 } else { | |
| 479 b = ngx_http_image_resize(r, ctx); | |
| 480 } | |
| 481 | |
| 482 return b; | |
| 483 } | |
| 484 | |
| 485 | |
| 486 static ngx_buf_t * | |
| 487 ngx_http_image_json(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 488 { | |
| 489 size_t len; | |
| 490 ngx_buf_t *b; | |
| 491 | |
| 492 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); | |
| 493 if (b == NULL) { | |
| 494 return NULL; | |
| 495 } | |
| 496 | |
| 497 b->memory = 1; | |
| 498 b->last_buf = 1; | |
| 499 | |
| 500 ngx_http_clean_header(r); | |
| 501 | |
| 502 r->headers_out.status = NGX_HTTP_OK; | |
| 503 r->headers_out.content_type.len = sizeof("text/plain") - 1; | |
| 504 r->headers_out.content_type.data = (u_char *) "text/plain"; | |
| 505 | |
| 506 if (ctx == NULL) { | |
| 507 b->pos = (u_char *) "{}" CRLF; | |
| 508 b->last = b->pos + sizeof("{}" CRLF) - 1; | |
| 509 | |
| 510 ngx_http_image_length(r, b); | |
| 511 | |
| 512 return b; | |
| 513 } | |
| 514 | |
| 515 len = sizeof("{ \"img\" : " | |
| 516 "{ \"width\": , \"height\": , \"type\": \"jpeg\" } }" CRLF) - 1 | |
| 517 + 2 * NGX_SIZE_T_LEN; | |
| 518 | |
| 519 b->pos = ngx_pnalloc(r->pool, len); | |
| 520 if (b->pos == NULL) { | |
| 521 return NULL; | |
| 522 } | |
| 523 | |
| 524 b->last = ngx_sprintf(b->pos, | |
| 525 "{ \"img\" : " | |
| 526 "{ \"width\": %uz," | |
| 527 " \"height\": %uz," | |
| 528 " \"type\": \"%s\" } }" CRLF, | |
| 529 ctx->width, ctx->height, | |
| 530 ngx_http_image_types[ctx->type - 1].data + 6); | |
| 531 | |
| 532 ngx_http_image_length(r, b); | |
| 533 | |
| 534 return b; | |
| 535 } | |
| 536 | |
| 537 | |
| 538 static ngx_buf_t * | |
| 539 ngx_http_image_asis(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 540 { | |
| 541 ngx_buf_t *b; | |
| 542 | |
| 543 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); | |
| 544 if (b == NULL) { | |
| 545 return NULL; | |
| 546 } | |
| 547 | |
| 548 b->pos = ctx->image; | |
| 549 b->last = ctx->last; | |
| 550 b->memory = 1; | |
| 551 b->last_buf = 1; | |
| 552 | |
| 553 ngx_http_image_length(r, b); | |
| 554 | |
| 555 return b; | |
| 556 } | |
| 557 | |
| 558 | |
| 559 static void | |
| 560 ngx_http_image_length(ngx_http_request_t *r, ngx_buf_t *b) | |
| 561 { | |
| 562 r->headers_out.content_length_n = b->last - b->pos; | |
| 563 | |
| 564 if (r->headers_out.content_length) { | |
| 565 r->headers_out.content_length->hash = 0; | |
| 566 } | |
| 567 | |
| 568 r->headers_out.content_length = NULL; | |
| 569 } | |
| 570 | |
| 571 | |
| 572 static ngx_int_t | |
| 573 ngx_http_image_size(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 574 { | |
| 575 u_char *p, *last; | |
| 576 ngx_uint_t width, height; | |
| 577 | |
| 578 p = ctx->image; | |
| 579 | |
| 580 switch (ctx->type) { | |
| 581 | |
| 582 case NGX_HTTP_IMAGE_JPEG: | |
| 583 | |
| 584 p += 2; | |
| 585 last = ctx->image + ctx->length - 10; | |
| 586 | |
| 587 while (p < last) { | |
| 588 | |
| 589 if (p[0] == 0xff && p[1] != 0xff) { | |
| 590 | |
| 591 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 592 "JPEG: %02xd %02xd", *p, *(p + 1)); | |
| 593 | |
| 594 p++; | |
| 595 | |
| 596 if (*p == 0xc0 || *p == 0xc1 || *p == 0xc2 || *p == 0xc3 | |
| 597 || *p == 0xc9 || *p == 0xca || *p == 0xcb) | |
| 598 { | |
| 599 goto found; | |
| 600 } | |
| 601 | |
| 602 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 603 "JPEG: %02xd %02xd", p[1], p[2]); | |
| 604 | |
| 605 p += p[1] * 256 + p[2]; | |
| 606 | |
| 607 continue; | |
| 608 } | |
| 609 | |
| 610 p++; | |
| 611 } | |
| 612 | |
| 613 return NGX_DECLINED; | |
| 614 | |
| 615 found: | |
| 616 | |
| 617 width = p[6] * 256 + p[7]; | |
| 618 height = p[4] * 256 + p[5]; | |
| 619 | |
| 620 break; | |
| 621 | |
| 622 case NGX_HTTP_IMAGE_GIF: | |
| 623 | |
| 624 if (ctx->length < 10) { | |
| 625 return NGX_DECLINED; | |
| 626 } | |
| 627 | |
| 628 width = p[7] * 256 + p[6]; | |
| 629 height = p[9] * 256 + p[8]; | |
| 630 | |
| 631 break; | |
| 632 | |
| 633 case NGX_HTTP_IMAGE_PNG: | |
| 634 | |
| 635 if (ctx->length < 24) { | |
| 636 return NGX_DECLINED; | |
| 637 } | |
| 638 | |
| 639 width = p[18] * 256 + p[19]; | |
| 640 height = p[22] * 256 + p[23]; | |
| 641 | |
| 642 break; | |
| 643 | |
| 644 default: | |
| 645 | |
| 646 return NGX_DECLINED; | |
| 647 } | |
| 648 | |
| 649 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 650 "image size: %d x %d", width, height); | |
| 651 | |
| 652 ctx->width = width; | |
| 653 ctx->height = height; | |
| 654 | |
| 655 return NGX_OK; | |
| 656 } | |
| 657 | |
| 658 | |
| 659 static ngx_buf_t * | |
| 660 ngx_http_image_resize(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 661 { | |
| 662 int sx, sy, dx, dy, ox, oy, | |
| 663 colors, transparent, size; | |
| 664 u_char *out; | |
| 665 ngx_buf_t *b; | |
| 666 ngx_uint_t resize; | |
| 667 gdImagePtr src, dst; | |
| 668 ngx_pool_cleanup_t *cln; | |
| 669 ngx_http_image_filter_conf_t *conf; | |
| 670 | |
| 671 src = ngx_http_image_source(r, ctx); | |
| 672 | |
| 673 if (src == NULL) { | |
| 674 return NULL; | |
| 675 } | |
| 676 | |
| 677 sx = gdImageSX(src); | |
| 678 sy = gdImageSY(src); | |
| 679 | |
| 680 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); | |
| 681 | |
| 682 if ((ngx_uint_t) sx <= conf->width && (ngx_uint_t) sy <= conf->height) { | |
| 683 gdImageDestroy(src); | |
| 684 return ngx_http_image_asis(r, ctx); | |
| 685 } | |
| 686 | |
| 687 colors = gdImageColorsTotal(src); | |
| 688 transparent = gdImageGetTransparent(src); | |
| 689 | |
| 690 dx = sx; | |
| 691 dy = sy; | |
| 692 | |
| 693 if (conf->filter == NGX_HTTP_IMAGE_RESIZE) { | |
| 694 | |
| 695 if ((ngx_uint_t) dx > conf->width) { | |
| 696 dy = dy * conf->width / dx; | |
| 697 dy = dy ? dy : 1; | |
| 698 dx = conf->width; | |
| 699 } | |
| 700 | |
| 701 if ((ngx_uint_t) dy > conf->height) { | |
| 702 dx = dx * conf->height / dy; | |
| 703 dx = dx ? dx : 1; | |
| 704 dy = conf->height; | |
| 705 } | |
| 706 | |
| 707 resize = 1; | |
| 708 | |
| 709 } else { /* NGX_HTTP_IMAGE_CROP */ | |
| 710 | |
| 711 resize = 0; | |
| 712 | |
| 713 if ((ngx_uint_t) (dx * 100 / dy) < conf->width * 100 / conf->height) { | |
| 714 | |
| 715 if ((ngx_uint_t) dx > conf->width) { | |
| 716 dy = dy * conf->width / dx; | |
| 717 dy = dy ? dy : 1; | |
| 718 dx = conf->width; | |
| 719 resize = 1; | |
| 720 } | |
| 721 | |
| 722 } else { | |
| 723 if ((ngx_uint_t) dy > conf->height) { | |
| 724 dx = dx * conf->height / dy; | |
| 725 dx = dx ? dx : 1; | |
| 726 dy = conf->height; | |
| 727 resize = 1; | |
| 728 } | |
| 729 } | |
| 730 } | |
| 731 | |
| 732 if (resize) { | |
| 733 dst = ngx_http_image_new(r, dx, dy, colors); | |
| 734 if (dst == NULL) { | |
| 735 gdImageDestroy(src); | |
| 736 return NULL; | |
| 737 } | |
| 738 | |
| 739 gdImageCopyResampled(dst, src, 0, 0, 0, 0, dx, dy, sx, sy); | |
| 740 | |
| 741 gdImageDestroy(src); | |
| 742 | |
| 743 } else { | |
| 744 dst = src; | |
| 745 } | |
| 746 | |
| 747 if (conf->filter == NGX_HTTP_IMAGE_CROP) { | |
| 748 | |
| 749 src = dst; | |
| 750 | |
| 751 if ((ngx_uint_t) dx > conf->width) { | |
| 752 ox = dx - conf->width; | |
| 753 | |
| 754 } else { | |
| 755 ox = 0; | |
| 756 } | |
| 757 | |
| 758 if ((ngx_uint_t) dy > conf->height) { | |
| 759 oy = dy - conf->height; | |
| 760 | |
| 761 } else { | |
| 762 oy = 0; | |
| 763 } | |
| 764 | |
| 765 if (ox || oy) { | |
| 766 | |
| 767 dst = ngx_http_image_new(r, dx - ox, dy - oy, colors); | |
| 768 | |
| 769 if (dst == NULL) { | |
| 770 gdImageDestroy(src); | |
| 771 return NULL; | |
| 772 } | |
| 773 | |
| 774 ox /= 2; | |
| 775 oy /= 2; | |
| 776 | |
| 777 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 778 "image crop: %d x %d @ %d x %d", | |
| 779 dx, dy, ox, oy); | |
| 780 | |
| 781 gdImageCopy(dst, src, 0, 0, ox, oy, dx - ox, dy - oy); | |
| 782 | |
| 783 gdImageDestroy(src); | |
| 784 } | |
| 785 } | |
| 786 | |
| 787 gdImageColorTransparent(dst, transparent); | |
| 788 | |
| 789 out = ngx_http_image_out(r, ctx->type, dst, &size); | |
| 790 | |
| 791 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 792 "image: %d x %d %d", sx, sy, colors); | |
| 793 | |
| 794 gdImageDestroy(dst); | |
| 795 ngx_pfree(r->pool, ctx->image); | |
| 796 | |
| 797 if (out == NULL) { | |
| 798 return NULL; | |
| 799 } | |
| 800 | |
| 801 cln = ngx_pool_cleanup_add(r->pool, 0); | |
| 802 if (cln == NULL) { | |
| 803 gdFree(out); | |
| 804 return NULL; | |
| 805 } | |
| 806 | |
| 807 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); | |
| 808 if (b == NULL) { | |
| 809 gdFree(out); | |
| 810 return NULL; | |
| 811 } | |
| 812 | |
| 813 cln->handler = ngx_http_image_cleanup; | |
| 814 cln->data = out; | |
| 815 | |
| 816 b->pos = out; | |
| 817 b->last = out + size; | |
| 818 b->memory = 1; | |
| 819 b->last_buf = 1; | |
| 820 | |
| 821 ngx_http_image_length(r, b); | |
| 822 | |
| 823 return b; | |
| 824 } | |
| 825 | |
| 826 | |
| 827 static gdImagePtr | |
| 828 ngx_http_image_source(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 829 { | |
| 830 char *failed; | |
| 831 gdImagePtr img; | |
| 832 | |
| 833 img = NULL; | |
| 834 | |
| 835 switch (ctx->type) { | |
| 836 | |
| 837 case NGX_HTTP_IMAGE_JPEG: | |
| 838 img = gdImageCreateFromJpegPtr(ctx->length, ctx->image); | |
| 839 failed = "gdImageCreateFromJpegPtr() failed"; | |
| 840 break; | |
| 841 | |
| 842 case NGX_HTTP_IMAGE_GIF: | |
| 843 img = gdImageCreateFromGifPtr(ctx->length, ctx->image); | |
| 844 failed = "gdImageCreateFromGifPtr() failed"; | |
| 845 break; | |
| 846 | |
| 847 case NGX_HTTP_IMAGE_PNG: | |
| 848 img = gdImageCreateFromPngPtr(ctx->length, ctx->image); | |
| 849 failed = "gdImageCreateFromPngPtr() failed"; | |
| 850 break; | |
| 851 | |
| 852 default: | |
| 853 failed = "unknown image type"; | |
| 854 break; | |
| 855 } | |
| 856 | |
| 857 if (img == NULL) { | |
| 858 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, failed); | |
| 859 } | |
| 860 | |
| 861 return img; | |
| 862 } | |
| 863 | |
| 864 | |
| 865 static gdImagePtr | |
| 866 ngx_http_image_new(ngx_http_request_t *r, int w, int h, int colors) | |
| 867 { | |
| 868 gdImagePtr img; | |
| 869 | |
| 870 if (colors == 0) { | |
| 871 img = gdImageCreateTrueColor(w, h); | |
| 872 | |
| 873 if (img == NULL) { | |
| 874 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 875 "gdImageCreateTrueColor() failed"); | |
| 876 return NULL; | |
| 877 } | |
| 878 | |
| 879 } else { | |
| 880 img = gdImageCreate(w, h); | |
| 881 | |
| 882 if (img == NULL) { | |
| 883 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 884 "gdImageCreate() failed"); | |
| 885 return NULL; | |
| 886 } | |
| 887 } | |
| 888 | |
| 889 return img; | |
| 890 } | |
| 891 | |
| 892 | |
| 893 static u_char * | |
| 894 ngx_http_image_out(ngx_http_request_t *r, ngx_uint_t type, gdImagePtr img, | |
| 895 int *size) | |
| 896 { | |
| 2848 | 897 char *failed; |
| 898 u_char *out; | |
| 899 ngx_http_image_filter_conf_t *conf; | |
| 2788 | 900 |
| 901 out = NULL; | |
| 902 | |
| 903 switch (type) { | |
| 904 | |
| 905 case NGX_HTTP_IMAGE_JPEG: | |
| 2848 | 906 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); |
| 907 out = gdImageJpegPtr(img, size, conf->jpeg_quality); | |
| 2788 | 908 failed = "gdImageJpegPtr() failed"; |
| 909 break; | |
| 910 | |
| 911 case NGX_HTTP_IMAGE_GIF: | |
| 912 out = gdImageGifPtr(img, size); | |
| 913 failed = "gdImageGifPtr() failed"; | |
| 914 break; | |
| 915 | |
| 916 case NGX_HTTP_IMAGE_PNG: | |
| 917 out = gdImagePngPtr(img, size); | |
| 918 failed = "gdImagePngPtr() failed"; | |
| 919 break; | |
| 920 | |
| 921 default: | |
| 922 failed = "unknown image type"; | |
| 923 break; | |
| 924 } | |
| 925 | |
| 926 if (out == NULL) { | |
| 927 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, failed); | |
| 928 } | |
| 929 | |
| 930 return out; | |
| 931 } | |
| 932 | |
| 933 | |
| 934 static void | |
| 935 ngx_http_image_cleanup(void *data) | |
| 936 { | |
| 937 gdFree(data); | |
| 938 } | |
| 939 | |
| 940 | |
| 941 static void * | |
| 942 ngx_http_image_filter_create_conf(ngx_conf_t *cf) | |
| 943 { | |
| 944 ngx_http_image_filter_conf_t *conf; | |
| 945 | |
| 946 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_image_filter_conf_t)); | |
| 947 if (conf == NULL) { | |
| 948 return NGX_CONF_ERROR; | |
| 949 } | |
| 950 | |
| 951 conf->filter = NGX_CONF_UNSET_UINT; | |
| 2848 | 952 conf->jpeg_quality = NGX_CONF_UNSET; |
| 2788 | 953 conf->buffer_size = NGX_CONF_UNSET_SIZE; |
| 954 | |
| 955 return conf; | |
| 956 } | |
| 957 | |
| 958 | |
| 959 static char * | |
| 960 ngx_http_image_filter_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
| 961 { | |
| 962 ngx_http_image_filter_conf_t *prev = parent; | |
| 963 ngx_http_image_filter_conf_t *conf = child; | |
| 964 | |
| 965 if (conf->filter == NGX_CONF_UNSET_UINT) { | |
| 966 | |
| 967 if (prev->filter == NGX_CONF_UNSET_UINT) { | |
| 968 conf->filter = NGX_HTTP_IMAGE_OFF; | |
| 969 | |
| 970 } else { | |
| 971 conf->filter = prev->filter; | |
| 972 conf->width = prev->width; | |
| 973 conf->height = prev->height; | |
| 974 } | |
| 975 } | |
| 976 | |
| 2848 | 977 /* 75 is libjpeg default quality */ |
| 978 ngx_conf_merge_value(conf->jpeg_quality, prev->jpeg_quality, 75); | |
| 979 | |
| 2788 | 980 ngx_conf_merge_size_value(conf->buffer_size, prev->buffer_size, |
| 981 1 * 1024 * 1024); | |
| 982 | |
| 983 return NGX_CONF_OK; | |
| 984 } | |
| 985 | |
| 986 | |
| 987 static char * | |
| 988 ngx_http_image_filter(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 989 { | |
| 990 ngx_http_image_filter_conf_t *imcf = conf; | |
| 991 | |
| 992 ngx_str_t *value; | |
| 993 ngx_int_t n; | |
| 994 ngx_uint_t i; | |
| 995 | |
| 996 value = cf->args->elts; | |
| 997 | |
| 998 i = 1; | |
| 999 | |
| 1000 if (cf->args->nelts == 2) { | |
| 1001 if (ngx_strcmp(value[i].data, "off") == 0) { | |
| 1002 imcf->filter = NGX_HTTP_IMAGE_OFF; | |
| 1003 | |
| 1004 } else if (ngx_strcmp(value[i].data, "test") == 0) { | |
| 1005 imcf->filter = NGX_HTTP_IMAGE_TEST; | |
| 1006 | |
| 1007 } else if (ngx_strcmp(value[i].data, "size") == 0) { | |
| 1008 imcf->filter = NGX_HTTP_IMAGE_SIZE; | |
| 1009 | |
| 1010 } else { | |
| 1011 goto failed; | |
| 1012 } | |
| 1013 | |
| 1014 return NGX_CONF_OK; | |
| 1015 } | |
| 1016 | |
| 1017 if (ngx_strcmp(value[i].data, "resize") == 0) { | |
| 1018 imcf->filter = NGX_HTTP_IMAGE_RESIZE; | |
| 1019 | |
| 1020 } else if (ngx_strcmp(value[i].data, "crop") == 0) { | |
| 1021 imcf->filter = NGX_HTTP_IMAGE_CROP; | |
| 1022 | |
| 1023 } else { | |
| 1024 goto failed; | |
| 1025 } | |
| 1026 | |
| 1027 i++; | |
| 1028 | |
| 1029 if (value[i].len == 1 && value[i].data[0] == '-') { | |
| 1030 imcf->width = (ngx_uint_t) -1; | |
| 1031 | |
| 1032 } else { | |
| 1033 n = ngx_atoi(value[i].data, value[i].len); | |
| 1034 if (n == NGX_ERROR) { | |
| 1035 goto failed; | |
| 1036 } | |
| 1037 | |
| 1038 imcf->width = (ngx_uint_t) n; | |
| 1039 } | |
| 1040 | |
| 1041 i++; | |
| 1042 | |
| 1043 if (value[i].len == 1 && value[i].data[0] == '-') { | |
| 1044 imcf->height = (ngx_uint_t) -1; | |
| 1045 | |
| 1046 } else { | |
| 1047 n = ngx_atoi(value[i].data, value[i].len); | |
| 1048 if (n == NGX_ERROR) { | |
| 1049 goto failed; | |
| 1050 } | |
| 1051 | |
| 1052 imcf->height = (ngx_uint_t) n; | |
| 1053 } | |
| 1054 | |
| 1055 return NGX_CONF_OK; | |
| 1056 | |
| 1057 failed: | |
| 1058 | |
| 1059 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", | |
| 1060 &value[i]); | |
| 1061 | |
| 1062 return NGX_CONF_ERROR; | |
| 1063 } | |
| 1064 | |
| 1065 | |
| 1066 static ngx_int_t | |
| 1067 ngx_http_image_filter_init(ngx_conf_t *cf) | |
| 1068 { | |
| 1069 ngx_http_next_header_filter = ngx_http_top_header_filter; | |
| 1070 ngx_http_top_header_filter = ngx_http_image_header_filter; | |
| 1071 | |
| 1072 ngx_http_next_body_filter = ngx_http_top_body_filter; | |
| 1073 ngx_http_top_body_filter = ngx_http_image_body_filter; | |
| 1074 | |
| 1075 return NGX_OK; | |
| 1076 } |