nginx/src/http/modules/ngx_http_gzip_filter_module.c

/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>

#include <zlib.h>


ngx_http_gzip_conf_t;


ngx_http_gzip_ctx_t;


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_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 = …;

static ngx_conf_post_handler_pt  ngx_http_gzip_window_p = …;
static ngx_conf_post_handler_pt  ngx_http_gzip_hash_p = …;


static ngx_command_t  ngx_http_gzip_filter_commands[] = …;


static ngx_http_module_t  ngx_http_gzip_filter_module_ctx = …;


ngx_module_t  ngx_http_gzip_filter_module = …;


static ngx_str_t  ngx_http_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_uint_t  ngx_http_gzip_assume_zlib_ng;


static ngx_int_t
ngx_http_gzip_header_filter(ngx_http_request_t *r)
{ … }


static ngx_int_t
ngx_http_gzip_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
{ … }


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_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 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 ngx_int_t
ngx_http_gzip_filter_init(ngx_conf_t *cf)
{ … }


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)
{ … }