Mercurial > hg > nginx
annotate src/http/modules/ngx_http_image_filter_module.c @ 2795:d82d08314f78
fix building ngx_http_image_filter_module on 64-bit platforms
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Mon, 04 May 2009 11:39:22 +0000 |
| parents | a16ec9e1b4d1 |
| children | 43fe53832da7 |
| 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> | |
| 10 #include "gd.h" | |
| 11 | |
| 12 | |
| 13 #define NGX_HTTP_IMAGE_OFF 0 | |
| 14 #define NGX_HTTP_IMAGE_TEST 1 | |
| 15 #define NGX_HTTP_IMAGE_SIZE 2 | |
| 16 #define NGX_HTTP_IMAGE_RESIZE 3 | |
| 17 #define NGX_HTTP_IMAGE_CROP 4 | |
| 18 | |
| 19 | |
| 20 #define NGX_HTTP_IMAGE_START 0 | |
| 21 #define NGX_HTTP_IMAGE_READ 1 | |
| 22 #define NGX_HTTP_IMAGE_PROCESS 2 | |
| 23 #define NGX_HTTP_IMAGE_DONE 3 | |
| 24 | |
| 25 | |
| 26 #define NGX_HTTP_IMAGE_NONE 0 | |
| 27 #define NGX_HTTP_IMAGE_JPEG 1 | |
| 28 #define NGX_HTTP_IMAGE_GIF 2 | |
| 29 #define NGX_HTTP_IMAGE_PNG 3 | |
| 30 | |
| 31 | |
| 32 #define NGX_HTTP_IMAGE_BUFFERED 0x08 | |
| 33 | |
| 34 | |
| 35 typedef struct { | |
| 36 ngx_uint_t filter; | |
| 37 ngx_uint_t width; | |
| 38 ngx_uint_t height; | |
| 39 | |
| 40 size_t buffer_size; | |
| 41 } ngx_http_image_filter_conf_t; | |
| 42 | |
| 43 | |
| 44 typedef struct { | |
| 45 u_char *image; | |
| 46 u_char *last; | |
| 47 | |
| 48 size_t length; | |
| 49 | |
| 50 ngx_uint_t width; | |
| 51 ngx_uint_t height; | |
| 52 | |
| 53 ngx_uint_t phase; | |
| 54 ngx_uint_t type; | |
| 55 } ngx_http_image_filter_ctx_t; | |
| 56 | |
| 57 | |
| 58 static ngx_uint_t ngx_http_image_test(ngx_http_request_t *r, ngx_chain_t *in); | |
| 59 static ngx_int_t ngx_http_image_read(ngx_http_request_t *r, ngx_chain_t *in); | |
| 60 static ngx_buf_t *ngx_http_image_process(ngx_http_request_t *r); | |
| 61 static ngx_buf_t *ngx_http_image_json(ngx_http_request_t *r, | |
| 62 ngx_http_image_filter_ctx_t *ctx); | |
| 63 static ngx_buf_t *ngx_http_image_asis(ngx_http_request_t *r, | |
| 64 ngx_http_image_filter_ctx_t *ctx); | |
| 65 static void ngx_http_image_length(ngx_http_request_t *r, ngx_buf_t *b); | |
| 66 static ngx_int_t ngx_http_image_size(ngx_http_request_t *r, | |
| 67 ngx_http_image_filter_ctx_t *ctx); | |
| 68 | |
| 69 static ngx_buf_t *ngx_http_image_resize(ngx_http_request_t *r, | |
| 70 ngx_http_image_filter_ctx_t *ctx); | |
| 71 static gdImagePtr ngx_http_image_source(ngx_http_request_t *r, | |
| 72 ngx_http_image_filter_ctx_t *ctx); | |
| 73 static gdImagePtr ngx_http_image_new(ngx_http_request_t *r, int w, int h, | |
| 74 int colors); | |
| 75 static u_char *ngx_http_image_out(ngx_http_request_t *r, ngx_uint_t type, | |
| 76 gdImagePtr img, int *size); | |
| 77 static void ngx_http_image_cleanup(void *data); | |
| 78 | |
| 79 | |
| 80 static void *ngx_http_image_filter_create_conf(ngx_conf_t *cf); | |
| 81 static char *ngx_http_image_filter_merge_conf(ngx_conf_t *cf, void *parent, | |
| 82 void *child); | |
| 83 static char *ngx_http_image_filter(ngx_conf_t *cf, ngx_command_t *cmd, | |
| 84 void *conf); | |
| 85 static ngx_int_t ngx_http_image_filter_init(ngx_conf_t *cf); | |
| 86 | |
| 87 | |
| 88 static ngx_command_t ngx_http_image_filter_commands[] = { | |
| 89 | |
| 90 { ngx_string("image_filter"), | |
| 91 NGX_HTTP_LOC_CONF|NGX_CONF_TAKE13, | |
| 92 ngx_http_image_filter, | |
| 93 NGX_HTTP_LOC_CONF_OFFSET, | |
| 94 0, | |
| 95 NULL }, | |
| 96 | |
| 97 { ngx_string("image_filter_buffer"), | |
| 98 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
| 99 ngx_conf_set_size_slot, | |
| 100 NGX_HTTP_LOC_CONF_OFFSET, | |
| 101 offsetof(ngx_http_image_filter_conf_t, buffer_size), | |
| 102 NULL }, | |
| 103 | |
| 104 ngx_null_command | |
| 105 }; | |
| 106 | |
| 107 | |
| 108 static ngx_http_module_t ngx_http_image_filter_module_ctx = { | |
| 109 NULL, /* preconfiguration */ | |
| 110 ngx_http_image_filter_init, /* postconfiguration */ | |
| 111 | |
| 112 NULL, /* create main configuration */ | |
| 113 NULL, /* init main configuration */ | |
| 114 | |
| 115 NULL, /* create server configuration */ | |
| 116 NULL, /* merge server configuration */ | |
| 117 | |
| 118 ngx_http_image_filter_create_conf, /* create location configuration */ | |
| 119 ngx_http_image_filter_merge_conf /* merge location configuration */ | |
| 120 }; | |
| 121 | |
| 122 | |
| 123 ngx_module_t ngx_http_image_filter_module = { | |
| 124 NGX_MODULE_V1, | |
| 125 &ngx_http_image_filter_module_ctx, /* module context */ | |
| 126 ngx_http_image_filter_commands, /* module directives */ | |
| 127 NGX_HTTP_MODULE, /* module type */ | |
| 128 NULL, /* init master */ | |
| 129 NULL, /* init module */ | |
| 130 NULL, /* init process */ | |
| 131 NULL, /* init thread */ | |
| 132 NULL, /* exit thread */ | |
| 133 NULL, /* exit process */ | |
| 134 NULL, /* exit master */ | |
| 135 NGX_MODULE_V1_PADDING | |
| 136 }; | |
| 137 | |
| 138 | |
| 139 static ngx_http_output_header_filter_pt ngx_http_next_header_filter; | |
| 140 static ngx_http_output_body_filter_pt ngx_http_next_body_filter; | |
| 141 | |
| 142 | |
| 143 static ngx_str_t ngx_http_image_types[] = { | |
| 144 ngx_string("image/jpeg"), | |
| 145 ngx_string("image/gif"), | |
| 146 ngx_string("image/png") | |
| 147 }; | |
| 148 | |
| 149 | |
| 150 static ngx_int_t | |
| 151 ngx_http_image_header_filter(ngx_http_request_t *r) | |
| 152 { | |
| 153 off_t len; | |
| 154 ngx_http_image_filter_ctx_t *ctx; | |
| 155 ngx_http_image_filter_conf_t *conf; | |
| 156 | |
| 157 if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED) { | |
| 158 return ngx_http_next_header_filter(r); | |
| 159 } | |
| 160 | |
| 161 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); | |
| 162 | |
| 163 if (conf->filter == NGX_HTTP_IMAGE_OFF) { | |
| 164 return ngx_http_next_header_filter(r); | |
| 165 } | |
| 166 | |
| 167 if (r->headers_out.content_type.len | |
| 168 >= sizeof("multipart/x-mixed-replace") - 1 | |
| 169 && ngx_strncasecmp(r->headers_out.content_type.data, | |
| 170 (u_char *) "multipart/x-mixed-replace", | |
| 171 sizeof("multipart/x-mixed-replace") - 1) | |
| 172 == 0) | |
| 173 { | |
| 174 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 175 "image filter: multipart/x-mixed-replace response"); | |
| 176 | |
| 177 return NGX_ERROR; | |
| 178 } | |
| 179 | |
| 180 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_image_filter_ctx_t)); | |
| 181 if (ctx == NULL) { | |
| 182 return NGX_ERROR; | |
| 183 } | |
| 184 | |
| 185 ngx_http_set_ctx(r, ctx, ngx_http_image_filter_module); | |
| 186 | |
| 187 len = r->headers_out.content_length_n; | |
| 188 | |
|
2795
d82d08314f78
fix building ngx_http_image_filter_module on 64-bit platforms
Igor Sysoev <igor@sysoev.ru>
parents:
2788
diff
changeset
|
189 if (len != -1 && len > (off_t) conf->buffer_size) { |
| 2788 | 190 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
| 191 "image filter: too big response: %O", len); | |
| 192 | |
| 193 return NGX_ERROR; | |
| 194 } | |
| 195 | |
| 196 if (len == -1) { | |
| 197 ctx->length = conf->buffer_size; | |
| 198 | |
| 199 } else { | |
| 200 ctx->length = (size_t) len; | |
| 201 } | |
| 202 | |
| 203 if (r->headers_out.refresh) { | |
| 204 r->headers_out.refresh->hash = 0; | |
| 205 } | |
| 206 | |
| 207 r->main_filter_need_in_memory = 1; | |
| 208 r->allow_ranges = 0; | |
| 209 | |
| 210 return NGX_OK; | |
| 211 } | |
| 212 | |
| 213 | |
| 214 static ngx_int_t | |
| 215 ngx_http_image_body_filter(ngx_http_request_t *r, ngx_chain_t *in) | |
| 216 { | |
| 217 ngx_int_t rc; | |
| 218 ngx_str_t *ct; | |
| 219 ngx_chain_t out; | |
| 220 ngx_http_image_filter_ctx_t *ctx; | |
| 221 ngx_http_image_filter_conf_t *conf; | |
| 222 | |
| 223 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "image filter"); | |
| 224 | |
| 225 if (in == NULL) { | |
| 226 return ngx_http_next_body_filter(r, in); | |
| 227 } | |
| 228 | |
| 229 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); | |
| 230 | |
| 231 if (ctx == NULL) { | |
| 232 return ngx_http_next_body_filter(r, in); | |
| 233 } | |
| 234 | |
| 235 switch (ctx->phase) { | |
| 236 | |
| 237 case NGX_HTTP_IMAGE_START: | |
| 238 | |
| 239 ctx->type = ngx_http_image_test(r, in); | |
| 240 | |
| 241 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); | |
| 242 | |
| 243 if (ctx->type == NGX_HTTP_IMAGE_NONE) { | |
| 244 | |
| 245 if (conf->filter == NGX_HTTP_IMAGE_SIZE) { | |
| 246 out.buf = ngx_http_image_json(r, NULL); | |
| 247 | |
| 248 if (out.buf) { | |
| 249 out.next = NULL; | |
| 250 in = &out; | |
| 251 | |
| 252 break; | |
| 253 } | |
| 254 } | |
| 255 | |
| 256 return ngx_http_filter_finalize_request(r, | |
| 257 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE); | |
| 258 } | |
| 259 | |
| 260 /* override content type */ | |
| 261 | |
| 262 ct = &ngx_http_image_types[ctx->type - 1]; | |
| 263 r->headers_out.content_type_len = ct->len; | |
| 264 r->headers_out.content_type = *ct; | |
| 265 | |
| 266 if (conf->filter == NGX_HTTP_IMAGE_TEST) { | |
| 267 break; | |
| 268 } | |
| 269 | |
| 270 ctx->phase = NGX_HTTP_IMAGE_READ; | |
| 271 | |
| 272 /* fall through */ | |
| 273 | |
| 274 case NGX_HTTP_IMAGE_READ: | |
| 275 | |
| 276 rc = ngx_http_image_read(r, in); | |
| 277 | |
| 278 if (rc == NGX_AGAIN) { | |
| 279 return NGX_OK; | |
| 280 } | |
| 281 | |
| 282 if (rc == NGX_ERROR) { | |
| 283 return ngx_http_filter_finalize_request(r, | |
| 284 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE); | |
| 285 } | |
| 286 | |
| 287 /* fall through */ | |
| 288 | |
| 289 case NGX_HTTP_IMAGE_PROCESS: | |
| 290 | |
| 291 out.buf = ngx_http_image_process(r); | |
| 292 | |
| 293 if (out.buf == NULL) { | |
| 294 return ngx_http_filter_finalize_request(r, | |
| 295 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE); | |
| 296 } | |
| 297 | |
| 298 out.next = NULL; | |
| 299 in = &out; | |
| 300 | |
| 301 break; | |
| 302 | |
| 303 default: /* NGX_HTTP_IMAGE_DONE */ | |
| 304 | |
| 305 return ngx_http_next_body_filter(r, in); | |
| 306 } | |
| 307 | |
| 308 ctx->phase = NGX_HTTP_IMAGE_DONE; | |
| 309 | |
| 310 rc = ngx_http_next_header_filter(r); | |
| 311 | |
| 312 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) { | |
| 313 return rc; | |
| 314 } | |
| 315 | |
| 316 return ngx_http_next_body_filter(r, in); | |
| 317 } | |
| 318 | |
| 319 | |
| 320 static ngx_uint_t | |
| 321 ngx_http_image_test(ngx_http_request_t *r, ngx_chain_t *in) | |
| 322 { | |
| 323 u_char *p; | |
| 324 | |
| 325 p = in->buf->pos; | |
| 326 | |
| 327 if (in->buf->last - p < 16) { | |
| 328 return NGX_HTTP_IMAGE_NONE; | |
| 329 } | |
| 330 | |
| 331 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 332 "image filter: \"%c%c\"", p[0], p[1]); | |
| 333 | |
| 334 if (p[0] == 0xff && p[1] == 0xd8) { | |
| 335 | |
| 336 /* JPEG */ | |
| 337 | |
| 338 return NGX_HTTP_IMAGE_JPEG; | |
| 339 | |
| 340 } else if (p[0] == 'G' && p[1] == 'I' && p[2] == 'F' && p[3] == '8' | |
| 341 && p[4] == '9' && p[5] == 'a') | |
| 342 { | |
| 343 /* GIF */ | |
| 344 | |
| 345 return NGX_HTTP_IMAGE_GIF; | |
| 346 | |
| 347 } else if (p[0] == 0x89 && p[1] == 'P' && p[2] == 'N' && p[3] == 'G' | |
| 348 && p[4] == 0x0d && p[5] == 0x0a && p[6] == 0x1a && p[7] == 0x0a) | |
| 349 { | |
| 350 /* PNG */ | |
| 351 | |
| 352 return NGX_HTTP_IMAGE_PNG; | |
| 353 } | |
| 354 | |
| 355 return NGX_HTTP_IMAGE_NONE; | |
| 356 } | |
| 357 | |
| 358 | |
| 359 static ngx_int_t | |
| 360 ngx_http_image_read(ngx_http_request_t *r, ngx_chain_t *in) | |
| 361 { | |
| 362 u_char *p; | |
| 363 size_t size, rest; | |
| 364 ngx_buf_t *b; | |
| 365 ngx_chain_t *cl; | |
| 366 ngx_http_image_filter_ctx_t *ctx; | |
| 367 | |
| 368 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); | |
| 369 | |
| 370 if (ctx->image == NULL) { | |
| 371 ctx->image = ngx_palloc(r->pool, ctx->length); | |
| 372 if (ctx->image == NULL) { | |
| 373 return NGX_ERROR; | |
| 374 } | |
| 375 | |
| 376 ctx->last = ctx->image; | |
| 377 } | |
| 378 | |
| 379 p = ctx->last; | |
| 380 | |
| 381 for (cl = in; cl; cl = cl->next) { | |
| 382 | |
| 383 b = cl->buf; | |
| 384 size = b->last - b->pos; | |
| 385 | |
| 386 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 387 "image buf: %uz", size); | |
| 388 | |
| 389 rest = ctx->image + ctx->length - p; | |
| 390 size = (rest < size) ? rest : size; | |
| 391 | |
| 392 p = ngx_cpymem(p, b->pos, size); | |
| 393 b->pos += size; | |
| 394 | |
| 395 if (b->last_buf) { | |
| 396 ctx->last = p; | |
| 397 return NGX_OK; | |
| 398 } | |
| 399 } | |
| 400 | |
| 401 ctx->last = p; | |
| 402 r->connection->buffered |= NGX_HTTP_IMAGE_BUFFERED; | |
| 403 | |
| 404 return NGX_AGAIN; | |
| 405 } | |
| 406 | |
| 407 | |
| 408 static ngx_buf_t * | |
| 409 ngx_http_image_process(ngx_http_request_t *r) | |
| 410 { | |
| 411 ngx_buf_t *b; | |
| 412 ngx_int_t rc; | |
| 413 ngx_http_image_filter_ctx_t *ctx; | |
| 414 ngx_http_image_filter_conf_t *conf; | |
| 415 | |
| 416 r->connection->buffered &= ~NGX_HTTP_IMAGE_BUFFERED; | |
| 417 | |
| 418 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); | |
| 419 | |
| 420 rc = ngx_http_image_size(r, ctx); | |
| 421 | |
| 422 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); | |
| 423 | |
| 424 if (conf->filter == NGX_HTTP_IMAGE_SIZE) { | |
| 425 | |
| 426 b = ngx_http_image_json(r, rc == NGX_OK ? ctx : NULL); | |
| 427 | |
| 428 } else if (rc == NGX_OK | |
| 429 && ctx->width <= conf->width | |
| 430 && ctx->height <= conf->height) | |
| 431 { | |
| 432 b = ngx_http_image_asis(r, ctx); | |
| 433 | |
| 434 } else { | |
| 435 b = ngx_http_image_resize(r, ctx); | |
| 436 } | |
| 437 | |
| 438 return b; | |
| 439 } | |
| 440 | |
| 441 | |
| 442 static ngx_buf_t * | |
| 443 ngx_http_image_json(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 444 { | |
| 445 size_t len; | |
| 446 ngx_buf_t *b; | |
| 447 | |
| 448 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); | |
| 449 if (b == NULL) { | |
| 450 return NULL; | |
| 451 } | |
| 452 | |
| 453 b->memory = 1; | |
| 454 b->last_buf = 1; | |
| 455 | |
| 456 ngx_http_clean_header(r); | |
| 457 | |
| 458 r->headers_out.status = NGX_HTTP_OK; | |
| 459 r->headers_out.content_type.len = sizeof("text/plain") - 1; | |
| 460 r->headers_out.content_type.data = (u_char *) "text/plain"; | |
| 461 | |
| 462 if (ctx == NULL) { | |
| 463 b->pos = (u_char *) "{}" CRLF; | |
| 464 b->last = b->pos + sizeof("{}" CRLF) - 1; | |
| 465 | |
| 466 ngx_http_image_length(r, b); | |
| 467 | |
| 468 return b; | |
| 469 } | |
| 470 | |
| 471 len = sizeof("{ \"img\" : " | |
| 472 "{ \"width\": , \"height\": , \"type\": \"jpeg\" } }" CRLF) - 1 | |
| 473 + 2 * NGX_SIZE_T_LEN; | |
| 474 | |
| 475 b->pos = ngx_pnalloc(r->pool, len); | |
| 476 if (b->pos == NULL) { | |
| 477 return NULL; | |
| 478 } | |
| 479 | |
| 480 b->last = ngx_sprintf(b->pos, | |
| 481 "{ \"img\" : " | |
| 482 "{ \"width\": %uz," | |
| 483 " \"height\": %uz," | |
| 484 " \"type\": \"%s\" } }" CRLF, | |
| 485 ctx->width, ctx->height, | |
| 486 ngx_http_image_types[ctx->type - 1].data + 6); | |
| 487 | |
| 488 ngx_http_image_length(r, b); | |
| 489 | |
| 490 return b; | |
| 491 } | |
| 492 | |
| 493 | |
| 494 static ngx_buf_t * | |
| 495 ngx_http_image_asis(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 496 { | |
| 497 ngx_buf_t *b; | |
| 498 | |
| 499 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); | |
| 500 if (b == NULL) { | |
| 501 return NULL; | |
| 502 } | |
| 503 | |
| 504 b->pos = ctx->image; | |
| 505 b->last = ctx->last; | |
| 506 b->memory = 1; | |
| 507 b->last_buf = 1; | |
| 508 | |
| 509 ngx_http_image_length(r, b); | |
| 510 | |
| 511 return b; | |
| 512 } | |
| 513 | |
| 514 | |
| 515 static void | |
| 516 ngx_http_image_length(ngx_http_request_t *r, ngx_buf_t *b) | |
| 517 { | |
| 518 r->headers_out.content_length_n = b->last - b->pos; | |
| 519 | |
| 520 if (r->headers_out.content_length) { | |
| 521 r->headers_out.content_length->hash = 0; | |
| 522 } | |
| 523 | |
| 524 r->headers_out.content_length = NULL; | |
| 525 } | |
| 526 | |
| 527 | |
| 528 static ngx_int_t | |
| 529 ngx_http_image_size(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 530 { | |
| 531 u_char *p, *last; | |
| 532 ngx_uint_t width, height; | |
| 533 | |
| 534 p = ctx->image; | |
| 535 | |
| 536 switch (ctx->type) { | |
| 537 | |
| 538 case NGX_HTTP_IMAGE_JPEG: | |
| 539 | |
| 540 p += 2; | |
| 541 last = ctx->image + ctx->length - 10; | |
| 542 | |
| 543 while (p < last) { | |
| 544 | |
| 545 if (p[0] == 0xff && p[1] != 0xff) { | |
| 546 | |
| 547 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 548 "JPEG: %02xd %02xd", *p, *(p + 1)); | |
| 549 | |
| 550 p++; | |
| 551 | |
| 552 if (*p == 0xc0 || *p == 0xc1 || *p == 0xc2 || *p == 0xc3 | |
| 553 || *p == 0xc9 || *p == 0xca || *p == 0xcb) | |
| 554 { | |
| 555 goto found; | |
| 556 } | |
| 557 | |
| 558 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 559 "JPEG: %02xd %02xd", p[1], p[2]); | |
| 560 | |
| 561 p += p[1] * 256 + p[2]; | |
| 562 | |
| 563 continue; | |
| 564 } | |
| 565 | |
| 566 p++; | |
| 567 } | |
| 568 | |
| 569 return NGX_DECLINED; | |
| 570 | |
| 571 found: | |
| 572 | |
| 573 width = p[6] * 256 + p[7]; | |
| 574 height = p[4] * 256 + p[5]; | |
| 575 | |
| 576 break; | |
| 577 | |
| 578 case NGX_HTTP_IMAGE_GIF: | |
| 579 | |
| 580 if (ctx->length < 10) { | |
| 581 return NGX_DECLINED; | |
| 582 } | |
| 583 | |
| 584 width = p[7] * 256 + p[6]; | |
| 585 height = p[9] * 256 + p[8]; | |
| 586 | |
| 587 break; | |
| 588 | |
| 589 case NGX_HTTP_IMAGE_PNG: | |
| 590 | |
| 591 if (ctx->length < 24) { | |
| 592 return NGX_DECLINED; | |
| 593 } | |
| 594 | |
| 595 width = p[18] * 256 + p[19]; | |
| 596 height = p[22] * 256 + p[23]; | |
| 597 | |
| 598 break; | |
| 599 | |
| 600 default: | |
| 601 | |
| 602 return NGX_DECLINED; | |
| 603 } | |
| 604 | |
| 605 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 606 "image size: %d x %d", width, height); | |
| 607 | |
| 608 ctx->width = width; | |
| 609 ctx->height = height; | |
| 610 | |
| 611 return NGX_OK; | |
| 612 } | |
| 613 | |
| 614 | |
| 615 static ngx_buf_t * | |
| 616 ngx_http_image_resize(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 617 { | |
| 618 int sx, sy, dx, dy, ox, oy, | |
| 619 colors, transparent, size; | |
| 620 u_char *out; | |
| 621 ngx_buf_t *b; | |
| 622 ngx_uint_t resize; | |
| 623 gdImagePtr src, dst; | |
| 624 ngx_pool_cleanup_t *cln; | |
| 625 ngx_http_image_filter_conf_t *conf; | |
| 626 | |
| 627 src = ngx_http_image_source(r, ctx); | |
| 628 | |
| 629 if (src == NULL) { | |
| 630 return NULL; | |
| 631 } | |
| 632 | |
| 633 sx = gdImageSX(src); | |
| 634 sy = gdImageSY(src); | |
| 635 | |
| 636 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); | |
| 637 | |
| 638 if ((ngx_uint_t) sx <= conf->width && (ngx_uint_t) sy <= conf->height) { | |
| 639 gdImageDestroy(src); | |
| 640 return ngx_http_image_asis(r, ctx); | |
| 641 } | |
| 642 | |
| 643 colors = gdImageColorsTotal(src); | |
| 644 transparent = gdImageGetTransparent(src); | |
| 645 | |
| 646 dx = sx; | |
| 647 dy = sy; | |
| 648 | |
| 649 if (conf->filter == NGX_HTTP_IMAGE_RESIZE) { | |
| 650 | |
| 651 if ((ngx_uint_t) dx > conf->width) { | |
| 652 dy = dy * conf->width / dx; | |
| 653 dy = dy ? dy : 1; | |
| 654 dx = conf->width; | |
| 655 } | |
| 656 | |
| 657 if ((ngx_uint_t) dy > conf->height) { | |
| 658 dx = dx * conf->height / dy; | |
| 659 dx = dx ? dx : 1; | |
| 660 dy = conf->height; | |
| 661 } | |
| 662 | |
| 663 resize = 1; | |
| 664 | |
| 665 } else { /* NGX_HTTP_IMAGE_CROP */ | |
| 666 | |
| 667 resize = 0; | |
| 668 | |
| 669 if ((ngx_uint_t) (dx * 100 / dy) < conf->width * 100 / conf->height) { | |
| 670 | |
| 671 if ((ngx_uint_t) dx > conf->width) { | |
| 672 dy = dy * conf->width / dx; | |
| 673 dy = dy ? dy : 1; | |
| 674 dx = conf->width; | |
| 675 resize = 1; | |
| 676 } | |
| 677 | |
| 678 } else { | |
| 679 if ((ngx_uint_t) dy > conf->height) { | |
| 680 dx = dx * conf->height / dy; | |
| 681 dx = dx ? dx : 1; | |
| 682 dy = conf->height; | |
| 683 resize = 1; | |
| 684 } | |
| 685 } | |
| 686 } | |
| 687 | |
| 688 if (resize) { | |
| 689 dst = ngx_http_image_new(r, dx, dy, colors); | |
| 690 if (dst == NULL) { | |
| 691 gdImageDestroy(src); | |
| 692 return NULL; | |
| 693 } | |
| 694 | |
| 695 gdImageCopyResampled(dst, src, 0, 0, 0, 0, dx, dy, sx, sy); | |
| 696 | |
| 697 gdImageDestroy(src); | |
| 698 | |
| 699 } else { | |
| 700 dst = src; | |
| 701 } | |
| 702 | |
| 703 if (conf->filter == NGX_HTTP_IMAGE_CROP) { | |
| 704 | |
| 705 src = dst; | |
| 706 | |
| 707 if ((ngx_uint_t) dx > conf->width) { | |
| 708 ox = dx - conf->width; | |
| 709 | |
| 710 } else { | |
| 711 ox = 0; | |
| 712 } | |
| 713 | |
| 714 if ((ngx_uint_t) dy > conf->height) { | |
| 715 oy = dy - conf->height; | |
| 716 | |
| 717 } else { | |
| 718 oy = 0; | |
| 719 } | |
| 720 | |
| 721 if (ox || oy) { | |
| 722 | |
| 723 dst = ngx_http_image_new(r, dx - ox, dy - oy, colors); | |
| 724 | |
| 725 if (dst == NULL) { | |
| 726 gdImageDestroy(src); | |
| 727 return NULL; | |
| 728 } | |
| 729 | |
| 730 ox /= 2; | |
| 731 oy /= 2; | |
| 732 | |
| 733 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 734 "image crop: %d x %d @ %d x %d", | |
| 735 dx, dy, ox, oy); | |
| 736 | |
| 737 gdImageCopy(dst, src, 0, 0, ox, oy, dx - ox, dy - oy); | |
| 738 | |
| 739 gdImageDestroy(src); | |
| 740 } | |
| 741 } | |
| 742 | |
| 743 gdImageColorTransparent(dst, transparent); | |
| 744 | |
| 745 out = ngx_http_image_out(r, ctx->type, dst, &size); | |
| 746 | |
| 747 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 748 "image: %d x %d %d", sx, sy, colors); | |
| 749 | |
| 750 gdImageDestroy(dst); | |
| 751 ngx_pfree(r->pool, ctx->image); | |
| 752 | |
| 753 if (out == NULL) { | |
| 754 return NULL; | |
| 755 } | |
| 756 | |
| 757 cln = ngx_pool_cleanup_add(r->pool, 0); | |
| 758 if (cln == NULL) { | |
| 759 gdFree(out); | |
| 760 return NULL; | |
| 761 } | |
| 762 | |
| 763 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); | |
| 764 if (b == NULL) { | |
| 765 gdFree(out); | |
| 766 return NULL; | |
| 767 } | |
| 768 | |
| 769 cln->handler = ngx_http_image_cleanup; | |
| 770 cln->data = out; | |
| 771 | |
| 772 b->pos = out; | |
| 773 b->last = out + size; | |
| 774 b->memory = 1; | |
| 775 b->last_buf = 1; | |
| 776 | |
| 777 ngx_http_image_length(r, b); | |
| 778 | |
| 779 return b; | |
| 780 } | |
| 781 | |
| 782 | |
| 783 static gdImagePtr | |
| 784 ngx_http_image_source(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 785 { | |
| 786 char *failed; | |
| 787 gdImagePtr img; | |
| 788 | |
| 789 img = NULL; | |
| 790 | |
| 791 switch (ctx->type) { | |
| 792 | |
| 793 case NGX_HTTP_IMAGE_JPEG: | |
| 794 img = gdImageCreateFromJpegPtr(ctx->length, ctx->image); | |
| 795 failed = "gdImageCreateFromJpegPtr() failed"; | |
| 796 break; | |
| 797 | |
| 798 case NGX_HTTP_IMAGE_GIF: | |
| 799 img = gdImageCreateFromGifPtr(ctx->length, ctx->image); | |
| 800 failed = "gdImageCreateFromGifPtr() failed"; | |
| 801 break; | |
| 802 | |
| 803 case NGX_HTTP_IMAGE_PNG: | |
| 804 img = gdImageCreateFromPngPtr(ctx->length, ctx->image); | |
| 805 failed = "gdImageCreateFromPngPtr() failed"; | |
| 806 break; | |
| 807 | |
| 808 default: | |
| 809 failed = "unknown image type"; | |
| 810 break; | |
| 811 } | |
| 812 | |
| 813 if (img == NULL) { | |
| 814 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, failed); | |
| 815 } | |
| 816 | |
| 817 return img; | |
| 818 } | |
| 819 | |
| 820 | |
| 821 static gdImagePtr | |
| 822 ngx_http_image_new(ngx_http_request_t *r, int w, int h, int colors) | |
| 823 { | |
| 824 gdImagePtr img; | |
| 825 | |
| 826 if (colors == 0) { | |
| 827 img = gdImageCreateTrueColor(w, h); | |
| 828 | |
| 829 if (img == NULL) { | |
| 830 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 831 "gdImageCreateTrueColor() failed"); | |
| 832 return NULL; | |
| 833 } | |
| 834 | |
| 835 } else { | |
| 836 img = gdImageCreate(w, h); | |
| 837 | |
| 838 if (img == NULL) { | |
| 839 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 840 "gdImageCreate() failed"); | |
| 841 return NULL; | |
| 842 } | |
| 843 } | |
| 844 | |
| 845 return img; | |
| 846 } | |
| 847 | |
| 848 | |
| 849 static u_char * | |
| 850 ngx_http_image_out(ngx_http_request_t *r, ngx_uint_t type, gdImagePtr img, | |
| 851 int *size) | |
| 852 { | |
| 853 char *failed; | |
| 854 u_char *out; | |
| 855 | |
| 856 out = NULL; | |
| 857 | |
| 858 switch (type) { | |
| 859 | |
| 860 case NGX_HTTP_IMAGE_JPEG: | |
| 861 out = gdImageJpegPtr(img, size, /* default quality */ -1); | |
| 862 failed = "gdImageJpegPtr() failed"; | |
| 863 break; | |
| 864 | |
| 865 case NGX_HTTP_IMAGE_GIF: | |
| 866 out = gdImageGifPtr(img, size); | |
| 867 failed = "gdImageGifPtr() failed"; | |
| 868 break; | |
| 869 | |
| 870 case NGX_HTTP_IMAGE_PNG: | |
| 871 out = gdImagePngPtr(img, size); | |
| 872 failed = "gdImagePngPtr() failed"; | |
| 873 break; | |
| 874 | |
| 875 default: | |
| 876 failed = "unknown image type"; | |
| 877 break; | |
| 878 } | |
| 879 | |
| 880 if (out == NULL) { | |
| 881 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, failed); | |
| 882 } | |
| 883 | |
| 884 return out; | |
| 885 } | |
| 886 | |
| 887 | |
| 888 static void | |
| 889 ngx_http_image_cleanup(void *data) | |
| 890 { | |
| 891 gdFree(data); | |
| 892 } | |
| 893 | |
| 894 | |
| 895 static void * | |
| 896 ngx_http_image_filter_create_conf(ngx_conf_t *cf) | |
| 897 { | |
| 898 ngx_http_image_filter_conf_t *conf; | |
| 899 | |
| 900 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_image_filter_conf_t)); | |
| 901 if (conf == NULL) { | |
| 902 return NGX_CONF_ERROR; | |
| 903 } | |
| 904 | |
| 905 conf->filter = NGX_CONF_UNSET_UINT; | |
| 906 conf->buffer_size = NGX_CONF_UNSET_SIZE; | |
| 907 | |
| 908 return conf; | |
| 909 } | |
| 910 | |
| 911 | |
| 912 static char * | |
| 913 ngx_http_image_filter_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
| 914 { | |
| 915 ngx_http_image_filter_conf_t *prev = parent; | |
| 916 ngx_http_image_filter_conf_t *conf = child; | |
| 917 | |
| 918 if (conf->filter == NGX_CONF_UNSET_UINT) { | |
| 919 | |
| 920 if (prev->filter == NGX_CONF_UNSET_UINT) { | |
| 921 conf->filter = NGX_HTTP_IMAGE_OFF; | |
| 922 | |
| 923 } else { | |
| 924 conf->filter = prev->filter; | |
| 925 conf->width = prev->width; | |
| 926 conf->height = prev->height; | |
| 927 } | |
| 928 } | |
| 929 | |
| 930 ngx_conf_merge_size_value(conf->buffer_size, prev->buffer_size, | |
| 931 1 * 1024 * 1024); | |
| 932 | |
| 933 return NGX_CONF_OK; | |
| 934 } | |
| 935 | |
| 936 | |
| 937 static char * | |
| 938 ngx_http_image_filter(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 939 { | |
| 940 ngx_http_image_filter_conf_t *imcf = conf; | |
| 941 | |
| 942 ngx_str_t *value; | |
| 943 ngx_int_t n; | |
| 944 ngx_uint_t i; | |
| 945 | |
| 946 value = cf->args->elts; | |
| 947 | |
| 948 i = 1; | |
| 949 | |
| 950 if (cf->args->nelts == 2) { | |
| 951 if (ngx_strcmp(value[i].data, "off") == 0) { | |
| 952 imcf->filter = NGX_HTTP_IMAGE_OFF; | |
| 953 | |
| 954 } else if (ngx_strcmp(value[i].data, "test") == 0) { | |
| 955 imcf->filter = NGX_HTTP_IMAGE_TEST; | |
| 956 | |
| 957 } else if (ngx_strcmp(value[i].data, "size") == 0) { | |
| 958 imcf->filter = NGX_HTTP_IMAGE_SIZE; | |
| 959 | |
| 960 } else { | |
| 961 goto failed; | |
| 962 } | |
| 963 | |
| 964 return NGX_CONF_OK; | |
| 965 } | |
| 966 | |
| 967 if (ngx_strcmp(value[i].data, "resize") == 0) { | |
| 968 imcf->filter = NGX_HTTP_IMAGE_RESIZE; | |
| 969 | |
| 970 } else if (ngx_strcmp(value[i].data, "crop") == 0) { | |
| 971 imcf->filter = NGX_HTTP_IMAGE_CROP; | |
| 972 | |
| 973 } else { | |
| 974 goto failed; | |
| 975 } | |
| 976 | |
| 977 i++; | |
| 978 | |
| 979 if (value[i].len == 1 && value[i].data[0] == '-') { | |
| 980 imcf->width = (ngx_uint_t) -1; | |
| 981 | |
| 982 } else { | |
| 983 n = ngx_atoi(value[i].data, value[i].len); | |
| 984 if (n == NGX_ERROR) { | |
| 985 goto failed; | |
| 986 } | |
| 987 | |
| 988 imcf->width = (ngx_uint_t) n; | |
| 989 } | |
| 990 | |
| 991 i++; | |
| 992 | |
| 993 if (value[i].len == 1 && value[i].data[0] == '-') { | |
| 994 imcf->height = (ngx_uint_t) -1; | |
| 995 | |
| 996 } else { | |
| 997 n = ngx_atoi(value[i].data, value[i].len); | |
| 998 if (n == NGX_ERROR) { | |
| 999 goto failed; | |
| 1000 } | |
| 1001 | |
| 1002 imcf->height = (ngx_uint_t) n; | |
| 1003 } | |
| 1004 | |
| 1005 return NGX_CONF_OK; | |
| 1006 | |
| 1007 failed: | |
| 1008 | |
| 1009 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", | |
| 1010 &value[i]); | |
| 1011 | |
| 1012 return NGX_CONF_ERROR; | |
| 1013 } | |
| 1014 | |
| 1015 | |
| 1016 static ngx_int_t | |
| 1017 ngx_http_image_filter_init(ngx_conf_t *cf) | |
| 1018 { | |
| 1019 ngx_http_next_header_filter = ngx_http_top_header_filter; | |
| 1020 ngx_http_top_header_filter = ngx_http_image_header_filter; | |
| 1021 | |
| 1022 ngx_http_next_body_filter = ngx_http_top_body_filter; | |
| 1023 ngx_http_top_body_filter = ngx_http_image_body_filter; | |
| 1024 | |
| 1025 return NGX_OK; | |
| 1026 } |