diff options
Diffstat (limited to 'app/nginx/src/http/modules/ngx_http_gzip_filter_module.c')
| -rw-r--r-- | app/nginx/src/http/modules/ngx_http_gzip_filter_module.c | 1245 |
1 files changed, 0 insertions, 1245 deletions
diff --git a/app/nginx/src/http/modules/ngx_http_gzip_filter_module.c b/app/nginx/src/http/modules/ngx_http_gzip_filter_module.c deleted file mode 100644 index f9652d0..0000000 --- a/app/nginx/src/http/modules/ngx_http_gzip_filter_module.c +++ /dev/null @@ -1,1245 +0,0 @@ - -/* - * Copyright (C) Igor Sysoev - * Copyright (C) Nginx, Inc. - */ - - -#include <ngx_config.h> -#include <ngx_core.h> -#include <ngx_http.h> - -#include <zlib.h> - - -typedef struct { - ngx_flag_t enable; - ngx_flag_t no_buffer; - - ngx_hash_t types; - - ngx_bufs_t bufs; - - size_t postpone_gzipping; - ngx_int_t level; - size_t wbits; - size_t memlevel; - ssize_t min_length; - - ngx_array_t *types_keys; -} ngx_http_gzip_conf_t; - - -typedef struct { - ngx_chain_t *in; - ngx_chain_t *free; - ngx_chain_t *busy; - ngx_chain_t *out; - ngx_chain_t **last_out; - - ngx_chain_t *copied; - ngx_chain_t *copy_buf; - - ngx_buf_t *in_buf; - ngx_buf_t *out_buf; - ngx_int_t bufs; - - void *preallocated; - char *free_mem; - ngx_uint_t allocated; - - int wbits; - int memlevel; - - unsigned flush:4; - unsigned redo:1; - unsigned done:1; - unsigned nomem:1; - unsigned gzheader:1; - unsigned buffering:1; - - size_t zin; - size_t zout; - - uint32_t crc32; - z_stream zstream; - ngx_http_request_t *request; -} ngx_http_gzip_ctx_t; - - -#if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED) - -struct gztrailer { - uint32_t crc32; - uint32_t zlen; -}; - -#else /* NGX_HAVE_BIG_ENDIAN || !NGX_HAVE_NONALIGNED */ - -struct gztrailer { - u_char crc32[4]; - u_char zlen[4]; -}; - -#endif - - -static void ngx_http_gzip_filter_memory(ngx_http_request_t *r, - ngx_http_gzip_ctx_t *ctx); -static ngx_int_t ngx_http_gzip_filter_buffer(ngx_http_gzip_ctx_t *ctx, - ngx_chain_t *in); -static ngx_int_t ngx_http_gzip_filter_deflate_start(ngx_http_request_t *r, - ngx_http_gzip_ctx_t *ctx); -static ngx_int_t ngx_http_gzip_filter_gzheader(ngx_http_request_t *r, - ngx_http_gzip_ctx_t *ctx); -static ngx_int_t ngx_http_gzip_filter_add_data(ngx_http_request_t *r, - ngx_http_gzip_ctx_t *ctx); -static ngx_int_t ngx_http_gzip_filter_get_buf(ngx_http_request_t *r, - ngx_http_gzip_ctx_t *ctx); -static ngx_int_t ngx_http_gzip_filter_deflate(ngx_http_request_t *r, - ngx_http_gzip_ctx_t *ctx); -static ngx_int_t ngx_http_gzip_filter_deflate_end(ngx_http_request_t *r, - ngx_http_gzip_ctx_t *ctx); - -static void *ngx_http_gzip_filter_alloc(void *opaque, u_int items, - u_int size); -static void ngx_http_gzip_filter_free(void *opaque, void *address); -static void ngx_http_gzip_filter_free_copy_buf(ngx_http_request_t *r, - ngx_http_gzip_ctx_t *ctx); - -static ngx_int_t ngx_http_gzip_add_variables(ngx_conf_t *cf); -static ngx_int_t ngx_http_gzip_ratio_variable(ngx_http_request_t *r, - ngx_http_variable_value_t *v, uintptr_t data); - -static ngx_int_t ngx_http_gzip_filter_init(ngx_conf_t *cf); -static void *ngx_http_gzip_create_conf(ngx_conf_t *cf); -static char *ngx_http_gzip_merge_conf(ngx_conf_t *cf, - void *parent, void *child); -static char *ngx_http_gzip_window(ngx_conf_t *cf, void *post, void *data); -static char *ngx_http_gzip_hash(ngx_conf_t *cf, void *post, void *data); - - -static ngx_conf_num_bounds_t ngx_http_gzip_comp_level_bounds = { - ngx_conf_check_num_bounds, 1, 9 -}; - -static ngx_conf_post_handler_pt ngx_http_gzip_window_p = ngx_http_gzip_window; -static ngx_conf_post_handler_pt ngx_http_gzip_hash_p = ngx_http_gzip_hash; - - -static ngx_command_t ngx_http_gzip_filter_commands[] = { - - { ngx_string("gzip"), - NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF - |NGX_CONF_FLAG, - ngx_conf_set_flag_slot, - NGX_HTTP_LOC_CONF_OFFSET, - offsetof(ngx_http_gzip_conf_t, enable), - NULL }, - - { ngx_string("gzip_buffers"), - NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2, - ngx_conf_set_bufs_slot, - NGX_HTTP_LOC_CONF_OFFSET, - offsetof(ngx_http_gzip_conf_t, bufs), - NULL }, - - { ngx_string("gzip_types"), - NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE, - ngx_http_types_slot, - NGX_HTTP_LOC_CONF_OFFSET, - offsetof(ngx_http_gzip_conf_t, types_keys), - &ngx_http_html_default_types[0] }, - - { ngx_string("gzip_comp_level"), - NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, - ngx_conf_set_num_slot, - NGX_HTTP_LOC_CONF_OFFSET, - offsetof(ngx_http_gzip_conf_t, level), - &ngx_http_gzip_comp_level_bounds }, - - { ngx_string("gzip_window"), - NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, - ngx_conf_set_size_slot, - NGX_HTTP_LOC_CONF_OFFSET, - offsetof(ngx_http_gzip_conf_t, wbits), - &ngx_http_gzip_window_p }, - - { ngx_string("gzip_hash"), - NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, - ngx_conf_set_size_slot, - NGX_HTTP_LOC_CONF_OFFSET, - offsetof(ngx_http_gzip_conf_t, memlevel), - &ngx_http_gzip_hash_p }, - - { ngx_string("postpone_gzipping"), - NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, - ngx_conf_set_size_slot, - NGX_HTTP_LOC_CONF_OFFSET, - offsetof(ngx_http_gzip_conf_t, postpone_gzipping), - NULL }, - - { ngx_string("gzip_no_buffer"), - NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, - ngx_conf_set_flag_slot, - NGX_HTTP_LOC_CONF_OFFSET, - offsetof(ngx_http_gzip_conf_t, no_buffer), - NULL }, - - { ngx_string("gzip_min_length"), - NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, - ngx_conf_set_size_slot, - NGX_HTTP_LOC_CONF_OFFSET, - offsetof(ngx_http_gzip_conf_t, min_length), - NULL }, - - ngx_null_command -}; - - -static ngx_http_module_t ngx_http_gzip_filter_module_ctx = { - ngx_http_gzip_add_variables, /* preconfiguration */ - ngx_http_gzip_filter_init, /* postconfiguration */ - - NULL, /* create main configuration */ - NULL, /* init main configuration */ - - NULL, /* create server configuration */ - NULL, /* merge server configuration */ - - ngx_http_gzip_create_conf, /* create location configuration */ - ngx_http_gzip_merge_conf /* merge location configuration */ -}; - - -ngx_module_t ngx_http_gzip_filter_module = { - NGX_MODULE_V1, - &ngx_http_gzip_filter_module_ctx, /* module context */ - ngx_http_gzip_filter_commands, /* module directives */ - NGX_HTTP_MODULE, /* module type */ - NULL, /* init master */ - NULL, /* init module */ - NULL, /* init process */ - NULL, /* init thread */ - NULL, /* exit thread */ - NULL, /* exit process */ - NULL, /* exit master */ - NGX_MODULE_V1_PADDING -}; - - -static ngx_str_t ngx_http_gzip_ratio = ngx_string("gzip_ratio"); - -static ngx_http_output_header_filter_pt ngx_http_next_header_filter; -static ngx_http_output_body_filter_pt ngx_http_next_body_filter; - - -static ngx_int_t -ngx_http_gzip_header_filter(ngx_http_request_t *r) -{ - ngx_table_elt_t *h; - ngx_http_gzip_ctx_t *ctx; - ngx_http_gzip_conf_t *conf; - - conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module); - - if (!conf->enable - || (r->headers_out.status != NGX_HTTP_OK - && r->headers_out.status != NGX_HTTP_FORBIDDEN - && r->headers_out.status != NGX_HTTP_NOT_FOUND) - || (r->headers_out.content_encoding - && r->headers_out.content_encoding->value.len) - || (r->headers_out.content_length_n != -1 - && r->headers_out.content_length_n < conf->min_length) - || ngx_http_test_content_type(r, &conf->types) == NULL - || r->header_only) - { - return ngx_http_next_header_filter(r); - } - - r->gzip_vary = 1; - -#if (NGX_HTTP_DEGRADATION) - { - ngx_http_core_loc_conf_t *clcf; - - clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); - - if (clcf->gzip_disable_degradation && ngx_http_degraded(r)) { - return ngx_http_next_header_filter(r); - } - } -#endif - - if (!r->gzip_tested) { - if (ngx_http_gzip_ok(r) != NGX_OK) { - return ngx_http_next_header_filter(r); - } - - } else if (!r->gzip_ok) { - return ngx_http_next_header_filter(r); - } - - ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_gzip_ctx_t)); - if (ctx == NULL) { - return NGX_ERROR; - } - - ngx_http_set_ctx(r, ctx, ngx_http_gzip_filter_module); - - ctx->request = r; - ctx->buffering = (conf->postpone_gzipping != 0); - - ngx_http_gzip_filter_memory(r, ctx); - - h = ngx_list_push(&r->headers_out.headers); - if (h == NULL) { - return NGX_ERROR; - } - - h->hash = 1; - ngx_str_set(&h->key, "Content-Encoding"); - ngx_str_set(&h->value, "gzip"); - r->headers_out.content_encoding = h; - - r->main_filter_need_in_memory = 1; - - ngx_http_clear_content_length(r); - ngx_http_clear_accept_ranges(r); - ngx_http_weak_etag(r); - - return ngx_http_next_header_filter(r); -} - - -static ngx_int_t -ngx_http_gzip_body_filter(ngx_http_request_t *r, ngx_chain_t *in) -{ - int rc; - ngx_uint_t flush; - ngx_chain_t *cl; - ngx_http_gzip_ctx_t *ctx; - - ctx = ngx_http_get_module_ctx(r, ngx_http_gzip_filter_module); - - if (ctx == NULL || ctx->done || r->header_only) { - return ngx_http_next_body_filter(r, in); - } - - ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, - "http gzip filter"); - - if (ctx->buffering) { - - /* - * With default memory settings zlib starts to output gzipped data - * only after it has got about 90K, so it makes sense to allocate - * zlib memory (200-400K) only after we have enough data to compress. - * Although we copy buffers, nevertheless for not big responses - * this allows to allocate zlib memory, to compress and to output - * the response in one step using hot CPU cache. - */ - - if (in) { - switch (ngx_http_gzip_filter_buffer(ctx, in)) { - - case NGX_OK: - return NGX_OK; - - case NGX_DONE: - in = NULL; - break; - - default: /* NGX_ERROR */ - goto failed; - } - - } else { - ctx->buffering = 0; - } - } - - if (ctx->preallocated == NULL) { - if (ngx_http_gzip_filter_deflate_start(r, ctx) != NGX_OK) { - goto failed; - } - } - - if (in) { - if (ngx_chain_add_copy(r->pool, &ctx->in, in) != NGX_OK) { - goto failed; - } - - r->connection->buffered |= NGX_HTTP_GZIP_BUFFERED; - } - - if (ctx->nomem) { - - /* flush busy buffers */ - - if (ngx_http_next_body_filter(r, NULL) == NGX_ERROR) { - goto failed; - } - - cl = NULL; - - ngx_chain_update_chains(r->pool, &ctx->free, &ctx->busy, &cl, - (ngx_buf_tag_t) &ngx_http_gzip_filter_module); - ctx->nomem = 0; - flush = 0; - - } else { - flush = ctx->busy ? 1 : 0; - } - - for ( ;; ) { - - /* cycle while we can write to a client */ - - for ( ;; ) { - - /* cycle while there is data to feed zlib and ... */ - - rc = ngx_http_gzip_filter_add_data(r, ctx); - - if (rc == NGX_DECLINED) { - break; - } - - if (rc == NGX_AGAIN) { - continue; - } - - - /* ... there are buffers to write zlib output */ - - rc = ngx_http_gzip_filter_get_buf(r, ctx); - - if (rc == NGX_DECLINED) { - break; - } - - if (rc == NGX_ERROR) { - goto failed; - } - - - rc = ngx_http_gzip_filter_deflate(r, ctx); - - if (rc == NGX_OK) { - break; - } - - if (rc == NGX_ERROR) { - goto failed; - } - - /* rc == NGX_AGAIN */ - } - - if (ctx->out == NULL && !flush) { - ngx_http_gzip_filter_free_copy_buf(r, ctx); - - return ctx->busy ? NGX_AGAIN : NGX_OK; - } - - if (!ctx->gzheader) { - if (ngx_http_gzip_filter_gzheader(r, ctx) != NGX_OK) { - goto failed; - } - } - - rc = ngx_http_next_body_filter(r, ctx->out); - - if (rc == NGX_ERROR) { - goto failed; - } - - ngx_http_gzip_filter_free_copy_buf(r, ctx); - - ngx_chain_update_chains(r->pool, &ctx->free, &ctx->busy, &ctx->out, - (ngx_buf_tag_t) &ngx_http_gzip_filter_module); - ctx->last_out = &ctx->out; - - ctx->nomem = 0; - flush = 0; - - if (ctx->done) { - return rc; - } - } - - /* unreachable */ - -failed: - - ctx->done = 1; - - if (ctx->preallocated) { - deflateEnd(&ctx->zstream); - - ngx_pfree(r->pool, ctx->preallocated); - } - - ngx_http_gzip_filter_free_copy_buf(r, ctx); - - return NGX_ERROR; -} - - -static void -ngx_http_gzip_filter_memory(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx) -{ - int wbits, memlevel; - ngx_http_gzip_conf_t *conf; - - conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module); - - wbits = conf->wbits; - memlevel = conf->memlevel; - - if (r->headers_out.content_length_n > 0) { - - /* the actual zlib window size is smaller by 262 bytes */ - - while (r->headers_out.content_length_n < ((1 << (wbits - 1)) - 262)) { - wbits--; - memlevel--; - } - - if (memlevel < 1) { - memlevel = 1; - } - } - - ctx->wbits = wbits; - ctx->memlevel = memlevel; - - /* - * We preallocate a memory for zlib in one buffer (200K-400K), this - * decreases a number of malloc() and free() calls and also probably - * decreases a number of syscalls (sbrk()/mmap() and so on). - * Besides we free the memory as soon as a gzipping will complete - * and do not wait while a whole response will be sent to a client. - * - * 8K is for zlib deflate_state, it takes - * *) 5816 bytes on i386 and sparc64 (32-bit mode) - * *) 5920 bytes on amd64 and sparc64 - */ - - ctx->allocated = 8192 + (1 << (wbits + 2)) + (1 << (memlevel + 9)); -} - - -static ngx_int_t -ngx_http_gzip_filter_buffer(ngx_http_gzip_ctx_t *ctx, ngx_chain_t *in) -{ - size_t size, buffered; - ngx_buf_t *b, *buf; - ngx_chain_t *cl, **ll; - ngx_http_request_t *r; - ngx_http_gzip_conf_t *conf; - - r = ctx->request; - - r->connection->buffered |= NGX_HTTP_GZIP_BUFFERED; - - buffered = 0; - ll = &ctx->in; - - for (cl = ctx->in; cl; cl = cl->next) { - buffered += cl->buf->last - cl->buf->pos; - ll = &cl->next; - } - - conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module); - - while (in) { - cl = ngx_alloc_chain_link(r->pool); - if (cl == NULL) { - return NGX_ERROR; - } - - b = in->buf; - - size = b->last - b->pos; - buffered += size; - - if (b->flush || b->last_buf || buffered > conf->postpone_gzipping) { - ctx->buffering = 0; - } - - if (ctx->buffering && size) { - - buf = ngx_create_temp_buf(r->pool, size); - if (buf == NULL) { - return NGX_ERROR; - } - - buf->last = ngx_cpymem(buf->pos, b->pos, size); - b->pos = b->last; - - buf->last_buf = b->last_buf; - buf->tag = (ngx_buf_tag_t) &ngx_http_gzip_filter_module; - - cl->buf = buf; - - } else { - cl->buf = b; - } - - *ll = cl; - ll = &cl->next; - in = in->next; - } - - *ll = NULL; - - return ctx->buffering ? NGX_OK : NGX_DONE; -} - - -static ngx_int_t -ngx_http_gzip_filter_deflate_start(ngx_http_request_t *r, - ngx_http_gzip_ctx_t *ctx) -{ - int rc; - ngx_http_gzip_conf_t *conf; - - conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module); - - ctx->preallocated = ngx_palloc(r->pool, ctx->allocated); - if (ctx->preallocated == NULL) { - return NGX_ERROR; - } - - ctx->free_mem = ctx->preallocated; - - ctx->zstream.zalloc = ngx_http_gzip_filter_alloc; - ctx->zstream.zfree = ngx_http_gzip_filter_free; - ctx->zstream.opaque = ctx; - - rc = deflateInit2(&ctx->zstream, (int) conf->level, Z_DEFLATED, - - ctx->wbits, ctx->memlevel, Z_DEFAULT_STRATEGY); - - if (rc != Z_OK) { - ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, - "deflateInit2() failed: %d", rc); - return NGX_ERROR; - } - - ctx->last_out = &ctx->out; - ctx->crc32 = crc32(0L, Z_NULL, 0); - ctx->flush = Z_NO_FLUSH; - - return NGX_OK; -} - - -static ngx_int_t -ngx_http_gzip_filter_gzheader(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx) -{ - ngx_buf_t *b; - ngx_chain_t *cl; - static u_char gzheader[10] = - { 0x1f, 0x8b, Z_DEFLATED, 0, 0, 0, 0, 0, 0, 3 }; - - b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); - if (b == NULL) { - return NGX_ERROR; - } - - b->memory = 1; - b->pos = gzheader; - b->last = b->pos + 10; - - cl = ngx_alloc_chain_link(r->pool); - if (cl == NULL) { - return NGX_ERROR; - } - - cl->buf = b; - cl->next = ctx->out; - ctx->out = cl; - - ctx->gzheader = 1; - - return NGX_OK; -} - - -static ngx_int_t -ngx_http_gzip_filter_add_data(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx) -{ - ngx_chain_t *cl; - - if (ctx->zstream.avail_in || ctx->flush != Z_NO_FLUSH || ctx->redo) { - return NGX_OK; - } - - ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, - "gzip in: %p", ctx->in); - - if (ctx->in == NULL) { - return NGX_DECLINED; - } - - if (ctx->copy_buf) { - - /* - * to avoid CPU cache trashing we do not free() just quit buf, - * but postpone free()ing after zlib compressing and data output - */ - - ctx->copy_buf->next = ctx->copied; - ctx->copied = ctx->copy_buf; - ctx->copy_buf = NULL; - } - - cl = ctx->in; - ctx->in_buf = cl->buf; - ctx->in = cl->next; - - if (ctx->in_buf->tag == (ngx_buf_tag_t) &ngx_http_gzip_filter_module) { - ctx->copy_buf = cl; - - } else { - ngx_free_chain(r->pool, cl); - } - - ctx->zstream.next_in = ctx->in_buf->pos; - ctx->zstream.avail_in = ctx->in_buf->last - ctx->in_buf->pos; - - ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, - "gzip in_buf:%p ni:%p ai:%ud", - ctx->in_buf, - ctx->zstream.next_in, ctx->zstream.avail_in); - - if (ctx->in_buf->last_buf) { - ctx->flush = Z_FINISH; - - } else if (ctx->in_buf->flush) { - ctx->flush = Z_SYNC_FLUSH; - } - - if (ctx->zstream.avail_in) { - - ctx->crc32 = crc32(ctx->crc32, ctx->zstream.next_in, - ctx->zstream.avail_in); - - } else if (ctx->flush == Z_NO_FLUSH) { - return NGX_AGAIN; - } - - return NGX_OK; -} - - -static ngx_int_t -ngx_http_gzip_filter_get_buf(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx) -{ - ngx_chain_t *cl; - ngx_http_gzip_conf_t *conf; - - if (ctx->zstream.avail_out) { - return NGX_OK; - } - - conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module); - - if (ctx->free) { - - cl = ctx->free; - ctx->out_buf = cl->buf; - ctx->free = cl->next; - - ngx_free_chain(r->pool, cl); - - } else if (ctx->bufs < conf->bufs.num) { - - ctx->out_buf = ngx_create_temp_buf(r->pool, conf->bufs.size); - if (ctx->out_buf == NULL) { - return NGX_ERROR; - } - - ctx->out_buf->tag = (ngx_buf_tag_t) &ngx_http_gzip_filter_module; - ctx->out_buf->recycled = 1; - ctx->bufs++; - - } else { - ctx->nomem = 1; - return NGX_DECLINED; - } - - ctx->zstream.next_out = ctx->out_buf->pos; - ctx->zstream.avail_out = conf->bufs.size; - - return NGX_OK; -} - - -static ngx_int_t -ngx_http_gzip_filter_deflate(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx) -{ - int rc; - ngx_buf_t *b; - ngx_chain_t *cl; - ngx_http_gzip_conf_t *conf; - - ngx_log_debug6(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, - "deflate in: ni:%p no:%p ai:%ud ao:%ud fl:%d redo:%d", - ctx->zstream.next_in, ctx->zstream.next_out, - ctx->zstream.avail_in, ctx->zstream.avail_out, - ctx->flush, ctx->redo); - - rc = deflate(&ctx->zstream, ctx->flush); - - if (rc != Z_OK && rc != Z_STREAM_END && rc != Z_BUF_ERROR) { - ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, - "deflate() failed: %d, %d", ctx->flush, rc); - return NGX_ERROR; - } - - ngx_log_debug5(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, - "deflate out: ni:%p no:%p ai:%ud ao:%ud rc:%d", - ctx->zstream.next_in, ctx->zstream.next_out, - ctx->zstream.avail_in, ctx->zstream.avail_out, - rc); - - ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, - "gzip in_buf:%p pos:%p", - ctx->in_buf, ctx->in_buf->pos); - - if (ctx->zstream.next_in) { - ctx->in_buf->pos = ctx->zstream.next_in; - - if (ctx->zstream.avail_in == 0) { - ctx->zstream.next_in = NULL; - } - } - - ctx->out_buf->last = ctx->zstream.next_out; - - if (ctx->zstream.avail_out == 0) { - - /* zlib wants to output some more gzipped data */ - - cl = ngx_alloc_chain_link(r->pool); - if (cl == NULL) { - return NGX_ERROR; - } - - cl->buf = ctx->out_buf; - cl->next = NULL; - *ctx->last_out = cl; - ctx->last_out = &cl->next; - - ctx->redo = 1; - - return NGX_AGAIN; - } - - ctx->redo = 0; - - if (ctx->flush == Z_SYNC_FLUSH) { - - ctx->flush = Z_NO_FLUSH; - - cl = ngx_alloc_chain_link(r->pool); - if (cl == NULL) { - return NGX_ERROR; - } - - b = ctx->out_buf; - - if (ngx_buf_size(b) == 0) { - - b = ngx_calloc_buf(ctx->request->pool); - if (b == NULL) { - return NGX_ERROR; - } - - } else { - ctx->zstream.avail_out = 0; - } - - b->flush = 1; - - cl->buf = b; - cl->next = NULL; - *ctx->last_out = cl; - ctx->last_out = &cl->next; - - r->connection->buffered &= ~NGX_HTTP_GZIP_BUFFERED; - - return NGX_OK; - } - - if (rc == Z_STREAM_END) { - - if (ngx_http_gzip_filter_deflate_end(r, ctx) != NGX_OK) { - return NGX_ERROR; - } - - return NGX_OK; - } - - conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module); - - if (conf->no_buffer && ctx->in == NULL) { - - cl = ngx_alloc_chain_link(r->pool); - if (cl == NULL) { - return NGX_ERROR; - } - - cl->buf = ctx->out_buf; - cl->next = NULL; - *ctx->last_out = cl; - ctx->last_out = &cl->next; - - return NGX_OK; - } - - return NGX_AGAIN; -} - - -static ngx_int_t -ngx_http_gzip_filter_deflate_end(ngx_http_request_t *r, - ngx_http_gzip_ctx_t *ctx) -{ - int rc; - ngx_buf_t *b; - ngx_chain_t *cl; - struct gztrailer *trailer; - - ctx->zin = ctx->zstream.total_in; - ctx->zout = 10 + ctx->zstream.total_out + 8; - - rc = deflateEnd(&ctx->zstream); - - if (rc != Z_OK) { - ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, - "deflateEnd() failed: %d", rc); - return NGX_ERROR; - } - - ngx_pfree(r->pool, ctx->preallocated); - - cl = ngx_alloc_chain_link(r->pool); - if (cl == NULL) { - return NGX_ERROR; - } - - cl->buf = ctx->out_buf; - cl->next = NULL; - *ctx->last_out = cl; - ctx->last_out = &cl->next; - - if (ctx->zstream.avail_out >= 8) { - trailer = (struct gztrailer *) ctx->out_buf->last; - ctx->out_buf->last += 8; - ctx->out_buf->last_buf = 1; - - } else { - b = ngx_create_temp_buf(r->pool, 8); - if (b == NULL) { - return NGX_ERROR; - } - - b->last_buf = 1; - - cl = ngx_alloc_chain_link(r->pool); - if (cl == NULL) { - return NGX_ERROR; - } - - cl->buf = b; - cl->next = NULL; - *ctx->last_out = cl; - ctx->last_out = &cl->next; - trailer = (struct gztrailer *) b->pos; - b->last += 8; - } - -#if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED) - - trailer->crc32 = ctx->crc32; - trailer->zlen = ctx->zin; - -#else - - trailer->crc32[0] = (u_char) (ctx->crc32 & 0xff); - trailer->crc32[1] = (u_char) ((ctx->crc32 >> 8) & 0xff); - trailer->crc32[2] = (u_char) ((ctx->crc32 >> 16) & 0xff); - trailer->crc32[3] = (u_char) ((ctx->crc32 >> 24) & 0xff); - - trailer->zlen[0] = (u_char) (ctx->zin & 0xff); - trailer->zlen[1] = (u_char) ((ctx->zin >> 8) & 0xff); - trailer->zlen[2] = (u_char) ((ctx->zin >> 16) & 0xff); - trailer->zlen[3] = (u_char) ((ctx->zin >> 24) & 0xff); - -#endif - - ctx->zstream.avail_in = 0; - ctx->zstream.avail_out = 0; - - ctx->done = 1; - - r->connection->buffered &= ~NGX_HTTP_GZIP_BUFFERED; - - return NGX_OK; -} - - -static void * -ngx_http_gzip_filter_alloc(void *opaque, u_int items, u_int size) -{ - ngx_http_gzip_ctx_t *ctx = opaque; - - void *p; - ngx_uint_t alloc; - - alloc = items * size; - - if (alloc % 512 != 0 && alloc < 8192) { - - /* - * The zlib deflate_state allocation, it takes about 6K, - * we allocate 8K. Other allocations are divisible by 512. - */ - - alloc = 8192; - } - - if (alloc <= ctx->allocated) { - p = ctx->free_mem; - ctx->free_mem += alloc; - ctx->allocated -= alloc; - - ngx_log_debug4(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0, - "gzip alloc: n:%ud s:%ud a:%ui p:%p", - items, size, alloc, p); - - return p; - } - - ngx_log_error(NGX_LOG_ALERT, ctx->request->connection->log, 0, - "gzip filter failed to use preallocated memory: %ud of %ui", - items * size, ctx->allocated); - - p = ngx_palloc(ctx->request->pool, items * size); - - return p; -} - - -static void -ngx_http_gzip_filter_free(void *opaque, void *address) -{ -#if 0 - ngx_http_gzip_ctx_t *ctx = opaque; - - ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0, - "gzip free: %p", address); -#endif -} - - -static void -ngx_http_gzip_filter_free_copy_buf(ngx_http_request_t *r, - ngx_http_gzip_ctx_t *ctx) -{ - ngx_chain_t *cl; - - for (cl = ctx->copied; cl; cl = cl->next) { - ngx_pfree(r->pool, cl->buf->start); - } - - ctx->copied = NULL; -} - - -static ngx_int_t -ngx_http_gzip_add_variables(ngx_conf_t *cf) -{ - ngx_http_variable_t *var; - - var = ngx_http_add_variable(cf, &ngx_http_gzip_ratio, NGX_HTTP_VAR_NOHASH); - if (var == NULL) { - return NGX_ERROR; - } - - var->get_handler = ngx_http_gzip_ratio_variable; - - return NGX_OK; -} - - -static ngx_int_t -ngx_http_gzip_ratio_variable(ngx_http_request_t *r, - ngx_http_variable_value_t *v, uintptr_t data) -{ - ngx_uint_t zint, zfrac; - ngx_http_gzip_ctx_t *ctx; - - v->valid = 1; - v->no_cacheable = 0; - v->not_found = 0; - - ctx = ngx_http_get_module_ctx(r, ngx_http_gzip_filter_module); - - if (ctx == NULL || ctx->zout == 0) { - v->not_found = 1; - return NGX_OK; - } - - v->data = ngx_pnalloc(r->pool, NGX_INT32_LEN + 3); - if (v->data == NULL) { - return NGX_ERROR; - } - - zint = (ngx_uint_t) (ctx->zin / ctx->zout); - zfrac = (ngx_uint_t) ((ctx->zin * 100 / ctx->zout) % 100); - - if ((ctx->zin * 1000 / ctx->zout) % 10 > 4) { - - /* the rounding, e.g., 2.125 to 2.13 */ - - zfrac++; - - if (zfrac > 99) { - zint++; - zfrac = 0; - } - } - - v->len = ngx_sprintf(v->data, "%ui.%02ui", zint, zfrac) - v->data; - - return NGX_OK; -} - - -static void * -ngx_http_gzip_create_conf(ngx_conf_t *cf) -{ - ngx_http_gzip_conf_t *conf; - - conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_gzip_conf_t)); - if (conf == NULL) { - return NULL; - } - - /* - * set by ngx_pcalloc(): - * - * conf->bufs.num = 0; - * conf->types = { NULL }; - * conf->types_keys = NULL; - */ - - conf->enable = NGX_CONF_UNSET; - conf->no_buffer = NGX_CONF_UNSET; - - conf->postpone_gzipping = NGX_CONF_UNSET_SIZE; - conf->level = NGX_CONF_UNSET; - conf->wbits = NGX_CONF_UNSET_SIZE; - conf->memlevel = NGX_CONF_UNSET_SIZE; - conf->min_length = NGX_CONF_UNSET; - - return conf; -} - - -static char * -ngx_http_gzip_merge_conf(ngx_conf_t *cf, void *parent, void *child) -{ - ngx_http_gzip_conf_t *prev = parent; - ngx_http_gzip_conf_t *conf = child; - - ngx_conf_merge_value(conf->enable, prev->enable, 0); - ngx_conf_merge_value(conf->no_buffer, prev->no_buffer, 0); - - ngx_conf_merge_bufs_value(conf->bufs, prev->bufs, - (128 * 1024) / ngx_pagesize, ngx_pagesize); - - ngx_conf_merge_size_value(conf->postpone_gzipping, prev->postpone_gzipping, - 0); - ngx_conf_merge_value(conf->level, prev->level, 1); - ngx_conf_merge_size_value(conf->wbits, prev->wbits, MAX_WBITS); - ngx_conf_merge_size_value(conf->memlevel, prev->memlevel, - MAX_MEM_LEVEL - 1); - ngx_conf_merge_value(conf->min_length, prev->min_length, 20); - - if (ngx_http_merge_types(cf, &conf->types_keys, &conf->types, - &prev->types_keys, &prev->types, - ngx_http_html_default_types) - != NGX_OK) - { - return NGX_CONF_ERROR; - } - - return NGX_CONF_OK; -} - - -static ngx_int_t -ngx_http_gzip_filter_init(ngx_conf_t *cf) -{ - ngx_http_next_header_filter = ngx_http_top_header_filter; - ngx_http_top_header_filter = ngx_http_gzip_header_filter; - - ngx_http_next_body_filter = ngx_http_top_body_filter; - ngx_http_top_body_filter = ngx_http_gzip_body_filter; - - return NGX_OK; -} - - -static char * -ngx_http_gzip_window(ngx_conf_t *cf, void *post, void *data) -{ - size_t *np = data; - - size_t wbits, wsize; - - wbits = 15; - - for (wsize = 32 * 1024; wsize > 256; wsize >>= 1) { - - if (wsize == *np) { - *np = wbits; - - return NGX_CONF_OK; - } - - wbits--; - } - - return "must be 512, 1k, 2k, 4k, 8k, 16k, or 32k"; -} - - -static char * -ngx_http_gzip_hash(ngx_conf_t *cf, void *post, void *data) -{ - size_t *np = data; - - size_t memlevel, hsize; - - memlevel = 9; - - for (hsize = 128 * 1024; hsize > 256; hsize >>= 1) { - - if (hsize == *np) { - *np = memlevel; - - return NGX_CONF_OK; - } - - memlevel--; - } - - return "must be 512, 1k, 2k, 4k, 8k, 16k, 32k, 64k, or 128k"; -} |