1180 lines
30 KiB
C
1180 lines
30 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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* Copyright (C) Nginx, Inc.
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_http.h>
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#include <zlib.h>
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typedef struct {
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ngx_flag_t enable;
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ngx_flag_t no_buffer;
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ngx_hash_t types;
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ngx_bufs_t bufs;
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size_t postpone_gzipping;
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ngx_int_t level;
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size_t wbits;
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size_t memlevel;
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ssize_t min_length;
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ngx_array_t *types_keys;
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} ngx_http_gzip_conf_t;
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typedef struct {
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ngx_chain_t *in;
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ngx_chain_t *free;
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ngx_chain_t *busy;
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ngx_chain_t *out;
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ngx_chain_t **last_out;
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ngx_chain_t *copied;
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ngx_chain_t *copy_buf;
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ngx_buf_t *in_buf;
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ngx_buf_t *out_buf;
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ngx_int_t bufs;
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void *preallocated;
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char *free_mem;
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ngx_uint_t allocated;
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int wbits;
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int memlevel;
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unsigned flush:4;
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unsigned redo:1;
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unsigned done:1;
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unsigned nomem:1;
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unsigned buffering:1;
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unsigned zlib_ng:1;
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unsigned state_allocated:1;
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size_t zin;
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size_t zout;
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z_stream zstream;
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ngx_http_request_t *request;
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} ngx_http_gzip_ctx_t;
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static void ngx_http_gzip_filter_memory(ngx_http_request_t *r,
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ngx_http_gzip_ctx_t *ctx);
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static ngx_int_t ngx_http_gzip_filter_buffer(ngx_http_gzip_ctx_t *ctx,
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ngx_chain_t *in);
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static ngx_int_t ngx_http_gzip_filter_deflate_start(ngx_http_request_t *r,
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ngx_http_gzip_ctx_t *ctx);
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static ngx_int_t ngx_http_gzip_filter_add_data(ngx_http_request_t *r,
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ngx_http_gzip_ctx_t *ctx);
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static ngx_int_t ngx_http_gzip_filter_get_buf(ngx_http_request_t *r,
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ngx_http_gzip_ctx_t *ctx);
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static ngx_int_t ngx_http_gzip_filter_deflate(ngx_http_request_t *r,
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ngx_http_gzip_ctx_t *ctx);
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static ngx_int_t ngx_http_gzip_filter_deflate_end(ngx_http_request_t *r,
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ngx_http_gzip_ctx_t *ctx);
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static void *ngx_http_gzip_filter_alloc(void *opaque, u_int items,
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u_int size);
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static void ngx_http_gzip_filter_free(void *opaque, void *address);
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static void ngx_http_gzip_filter_free_copy_buf(ngx_http_request_t *r,
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ngx_http_gzip_ctx_t *ctx);
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static ngx_int_t ngx_http_gzip_add_variables(ngx_conf_t *cf);
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static ngx_int_t ngx_http_gzip_ratio_variable(ngx_http_request_t *r,
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ngx_http_variable_value_t *v, uintptr_t data);
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static ngx_int_t ngx_http_gzip_filter_init(ngx_conf_t *cf);
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static void *ngx_http_gzip_create_conf(ngx_conf_t *cf);
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static char *ngx_http_gzip_merge_conf(ngx_conf_t *cf,
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void *parent, void *child);
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static char *ngx_http_gzip_window(ngx_conf_t *cf, void *post, void *data);
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static char *ngx_http_gzip_hash(ngx_conf_t *cf, void *post, void *data);
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static ngx_conf_num_bounds_t ngx_http_gzip_comp_level_bounds = {
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ngx_conf_check_num_bounds, 1, 9
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};
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static ngx_conf_post_handler_pt ngx_http_gzip_window_p = ngx_http_gzip_window;
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static ngx_conf_post_handler_pt ngx_http_gzip_hash_p = ngx_http_gzip_hash;
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static ngx_command_t ngx_http_gzip_filter_commands[] = {
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{ ngx_string("gzip"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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|NGX_CONF_FLAG,
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ngx_conf_set_flag_slot,
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NGX_HTTP_LOC_CONF_OFFSET,
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offsetof(ngx_http_gzip_conf_t, enable),
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NULL },
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{ ngx_string("gzip_buffers"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2,
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ngx_conf_set_bufs_slot,
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NGX_HTTP_LOC_CONF_OFFSET,
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offsetof(ngx_http_gzip_conf_t, bufs),
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NULL },
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{ ngx_string("gzip_types"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
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ngx_http_types_slot,
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NGX_HTTP_LOC_CONF_OFFSET,
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offsetof(ngx_http_gzip_conf_t, types_keys),
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&ngx_http_html_default_types[0] },
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{ ngx_string("gzip_comp_level"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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ngx_conf_set_num_slot,
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NGX_HTTP_LOC_CONF_OFFSET,
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offsetof(ngx_http_gzip_conf_t, level),
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&ngx_http_gzip_comp_level_bounds },
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{ ngx_string("gzip_window"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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ngx_conf_set_size_slot,
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NGX_HTTP_LOC_CONF_OFFSET,
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offsetof(ngx_http_gzip_conf_t, wbits),
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&ngx_http_gzip_window_p },
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{ ngx_string("gzip_hash"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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ngx_conf_set_size_slot,
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NGX_HTTP_LOC_CONF_OFFSET,
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offsetof(ngx_http_gzip_conf_t, memlevel),
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&ngx_http_gzip_hash_p },
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{ ngx_string("postpone_gzipping"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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ngx_conf_set_size_slot,
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NGX_HTTP_LOC_CONF_OFFSET,
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offsetof(ngx_http_gzip_conf_t, postpone_gzipping),
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NULL },
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{ ngx_string("gzip_no_buffer"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
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ngx_conf_set_flag_slot,
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NGX_HTTP_LOC_CONF_OFFSET,
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offsetof(ngx_http_gzip_conf_t, no_buffer),
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NULL },
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{ ngx_string("gzip_min_length"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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ngx_conf_set_size_slot,
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NGX_HTTP_LOC_CONF_OFFSET,
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offsetof(ngx_http_gzip_conf_t, min_length),
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NULL },
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ngx_null_command
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};
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static ngx_http_module_t ngx_http_gzip_filter_module_ctx = {
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ngx_http_gzip_add_variables, /* preconfiguration */
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ngx_http_gzip_filter_init, /* postconfiguration */
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NULL, /* create main configuration */
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NULL, /* init main configuration */
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NULL, /* create server configuration */
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NULL, /* merge server configuration */
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ngx_http_gzip_create_conf, /* create location configuration */
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ngx_http_gzip_merge_conf /* merge location configuration */
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};
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ngx_module_t ngx_http_gzip_filter_module = {
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NGX_MODULE_V1,
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&ngx_http_gzip_filter_module_ctx, /* module context */
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ngx_http_gzip_filter_commands, /* module directives */
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NGX_HTTP_MODULE, /* module type */
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NULL, /* init master */
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NULL, /* init module */
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NULL, /* init process */
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NULL, /* init thread */
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NULL, /* exit thread */
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NULL, /* exit process */
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NULL, /* exit master */
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NGX_MODULE_V1_PADDING
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};
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static ngx_str_t ngx_http_gzip_ratio = ngx_string("gzip_ratio");
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static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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static ngx_uint_t ngx_http_gzip_assume_zlib_ng;
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static ngx_int_t
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ngx_http_gzip_header_filter(ngx_http_request_t *r)
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{
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ngx_table_elt_t *h;
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ngx_http_gzip_ctx_t *ctx;
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ngx_http_gzip_conf_t *conf;
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conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module);
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if (!conf->enable
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|| (r->headers_out.status != NGX_HTTP_OK
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&& r->headers_out.status != NGX_HTTP_FORBIDDEN
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&& r->headers_out.status != NGX_HTTP_NOT_FOUND)
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|| (r->headers_out.content_encoding
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&& r->headers_out.content_encoding->value.len)
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|| (r->headers_out.content_length_n != -1
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&& r->headers_out.content_length_n < conf->min_length)
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|| ngx_http_test_content_type(r, &conf->types) == NULL
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|| r->header_only)
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{
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return ngx_http_next_header_filter(r);
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}
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r->gzip_vary = 1;
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#if (NGX_HTTP_DEGRADATION)
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{
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ngx_http_core_loc_conf_t *clcf;
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clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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if (clcf->gzip_disable_degradation && ngx_http_degraded(r)) {
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return ngx_http_next_header_filter(r);
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}
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}
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#endif
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if (!r->gzip_tested) {
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if (ngx_http_gzip_ok(r) != NGX_OK) {
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return ngx_http_next_header_filter(r);
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}
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} else if (!r->gzip_ok) {
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return ngx_http_next_header_filter(r);
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}
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ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_gzip_ctx_t));
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if (ctx == NULL) {
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return NGX_ERROR;
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}
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ngx_http_set_ctx(r, ctx, ngx_http_gzip_filter_module);
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ctx->request = r;
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ctx->buffering = (conf->postpone_gzipping != 0);
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ngx_http_gzip_filter_memory(r, ctx);
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h = ngx_list_push(&r->headers_out.headers);
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if (h == NULL) {
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return NGX_ERROR;
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}
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h->hash = 1;
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h->next = NULL;
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ngx_str_set(&h->key, "Content-Encoding");
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ngx_str_set(&h->value, "gzip");
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r->headers_out.content_encoding = h;
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r->main_filter_need_in_memory = 1;
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ngx_http_clear_content_length(r);
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ngx_http_clear_accept_ranges(r);
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ngx_http_weak_etag(r);
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return ngx_http_next_header_filter(r);
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}
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static ngx_int_t
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ngx_http_gzip_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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{
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int rc;
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ngx_uint_t flush;
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ngx_chain_t *cl;
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ngx_http_gzip_ctx_t *ctx;
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ctx = ngx_http_get_module_ctx(r, ngx_http_gzip_filter_module);
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if (ctx == NULL || ctx->done || r->header_only) {
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return ngx_http_next_body_filter(r, in);
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}
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ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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"http gzip filter");
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if (ctx->buffering) {
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/*
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* With default memory settings zlib starts to output gzipped data
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* only after it has got about 90K, so it makes sense to allocate
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* zlib memory (200-400K) only after we have enough data to compress.
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* Although we copy buffers, nevertheless for not big responses
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* this allows to allocate zlib memory, to compress and to output
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* the response in one step using hot CPU cache.
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*/
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if (in) {
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switch (ngx_http_gzip_filter_buffer(ctx, in)) {
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case NGX_OK:
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return NGX_OK;
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case NGX_DONE:
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in = NULL;
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break;
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default: /* NGX_ERROR */
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goto failed;
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}
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} else {
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ctx->buffering = 0;
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}
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}
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if (ctx->preallocated == NULL) {
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if (ngx_http_gzip_filter_deflate_start(r, ctx) != NGX_OK) {
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goto failed;
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}
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}
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if (in) {
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if (ngx_chain_add_copy(r->pool, &ctx->in, in) != NGX_OK) {
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goto failed;
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}
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r->connection->buffered |= NGX_HTTP_GZIP_BUFFERED;
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}
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if (ctx->nomem) {
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/* flush busy buffers */
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if (ngx_http_next_body_filter(r, NULL) == NGX_ERROR) {
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goto failed;
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}
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cl = NULL;
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ngx_chain_update_chains(r->pool, &ctx->free, &ctx->busy, &cl,
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(ngx_buf_tag_t) &ngx_http_gzip_filter_module);
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ctx->nomem = 0;
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flush = 0;
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} else {
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flush = ctx->busy ? 1 : 0;
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}
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for ( ;; ) {
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/* cycle while we can write to a client */
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for ( ;; ) {
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/* cycle while there is data to feed zlib and ... */
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rc = ngx_http_gzip_filter_add_data(r, ctx);
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if (rc == NGX_DECLINED) {
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break;
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}
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if (rc == NGX_AGAIN) {
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continue;
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}
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/* ... there are buffers to write zlib output */
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rc = ngx_http_gzip_filter_get_buf(r, ctx);
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if (rc == NGX_DECLINED) {
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break;
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}
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if (rc == NGX_ERROR) {
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goto failed;
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}
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rc = ngx_http_gzip_filter_deflate(r, ctx);
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if (rc == NGX_OK) {
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break;
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}
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if (rc == NGX_ERROR) {
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goto failed;
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}
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/* rc == NGX_AGAIN */
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}
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if (ctx->out == NULL && !flush) {
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ngx_http_gzip_filter_free_copy_buf(r, ctx);
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return ctx->busy ? NGX_AGAIN : NGX_OK;
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}
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rc = ngx_http_next_body_filter(r, ctx->out);
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if (rc == NGX_ERROR) {
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goto failed;
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}
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ngx_http_gzip_filter_free_copy_buf(r, ctx);
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ngx_chain_update_chains(r->pool, &ctx->free, &ctx->busy, &ctx->out,
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(ngx_buf_tag_t) &ngx_http_gzip_filter_module);
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ctx->last_out = &ctx->out;
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ctx->nomem = 0;
|
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flush = 0;
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|
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if (ctx->done) {
|
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return rc;
|
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}
|
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}
|
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|
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/* unreachable */
|
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|
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failed:
|
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|
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ctx->done = 1;
|
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|
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if (ctx->preallocated) {
|
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deflateEnd(&ctx->zstream);
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|
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ngx_pfree(r->pool, ctx->preallocated);
|
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}
|
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|
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ngx_http_gzip_filter_free_copy_buf(r, ctx);
|
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|
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return NGX_ERROR;
|
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}
|
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|
|
|
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static void
|
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ngx_http_gzip_filter_memory(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx)
|
|
{
|
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int wbits, memlevel;
|
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ngx_http_gzip_conf_t *conf;
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|
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conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module);
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|
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wbits = conf->wbits;
|
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memlevel = conf->memlevel;
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|
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if (r->headers_out.content_length_n > 0) {
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|
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/* the actual zlib window size is smaller by 262 bytes */
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|
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while (r->headers_out.content_length_n < ((1 << (wbits - 1)) - 262)) {
|
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wbits--;
|
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memlevel--;
|
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}
|
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|
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if (memlevel < 1) {
|
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memlevel = 1;
|
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}
|
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}
|
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|
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ctx->wbits = wbits;
|
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ctx->memlevel = memlevel;
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|
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/*
|
|
* 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
|
|
*
|
|
* A zlib variant from Intel (https://github.com/jtkukunas/zlib)
|
|
* uses additional 16-byte padding in one of window-sized buffers.
|
|
*/
|
|
|
|
if (!ngx_http_gzip_assume_zlib_ng) {
|
|
ctx->allocated = 8192 + 16 + (1 << (wbits + 2))
|
|
+ (1 << (memlevel + 9));
|
|
|
|
} else {
|
|
/*
|
|
* Another zlib variant, https://github.com/zlib-ng/zlib-ng.
|
|
* It used to force window bits to 13 for fast compression level,
|
|
* uses (64 + sizeof(void*)) additional space on all allocations
|
|
* for alignment, 16-byte padding in one of window-sized buffers,
|
|
* and 128K hash.
|
|
*/
|
|
|
|
if (conf->level == 1) {
|
|
wbits = ngx_max(wbits, 13);
|
|
}
|
|
|
|
ctx->allocated = 8192 + 16 + (1 << (wbits + 2))
|
|
+ 131072 + (1 << (memlevel + 8))
|
|
+ 4 * (64 + sizeof(void*));
|
|
ctx->zlib_ng = 1;
|
|
}
|
|
}
|
|
|
|
|
|
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 + 16, 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->flush = Z_NO_FLUSH;
|
|
|
|
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;
|
|
|
|
} else if (ctx->zstream.avail_in == 0) {
|
|
/* 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 && rc != Z_STREAM_END) {
|
|
|
|
/* 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;
|
|
|
|
ctx->zin = ctx->zstream.total_in;
|
|
ctx->zout = ctx->zstream.total_out;
|
|
|
|
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;
|
|
}
|
|
|
|
b = ctx->out_buf;
|
|
|
|
if (ngx_buf_size(b) == 0) {
|
|
b->temporary = 0;
|
|
}
|
|
|
|
b->last_buf = 1;
|
|
|
|
cl->buf = b;
|
|
cl->next = NULL;
|
|
*ctx->last_out = cl;
|
|
ctx->last_out = &cl->next;
|
|
|
|
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 (items == 1 && alloc % 512 != 0 && alloc < 8192
|
|
&& !ctx->state_allocated)
|
|
{
|
|
/*
|
|
* The zlib deflate_state allocation, it takes about 6K,
|
|
* we allocate 8K. Other allocations are divisible by 512.
|
|
*/
|
|
|
|
ctx->state_allocated = 1;
|
|
|
|
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;
|
|
}
|
|
|
|
if (ctx->zlib_ng) {
|
|
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);
|
|
|
|
} else {
|
|
ngx_http_gzip_assume_zlib_ng = 1;
|
|
}
|
|
|
|
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;
|
|
|
|
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->valid = 1;
|
|
v->no_cacheable = 0;
|
|
v->not_found = 0;
|
|
|
|
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";
|
|
}
|