nginx/src/http/modules/ngx_http_range_filter_module.c

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


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


/*
 * the single part format:
 *
 * "HTTP/1.0 206 Partial Content" CRLF
 * ... header ...
 * "Content-Type: image/jpeg" CRLF
 * "Content-Length: SIZE" CRLF
 * "Content-Range: bytes START-END/SIZE" CRLF
 * CRLF
 * ... data ...
 *
 *
 * the multipart format:
 *
 * "HTTP/1.0 206 Partial Content" CRLF
 * ... header ...
 * "Content-Type: multipart/byteranges; boundary=0123456789" CRLF
 * CRLF
 * CRLF
 * "--0123456789" CRLF
 * "Content-Type: image/jpeg" CRLF
 * "Content-Range: bytes START0-END0/SIZE" CRLF
 * CRLF
 * ... data ...
 * CRLF
 * "--0123456789" CRLF
 * "Content-Type: image/jpeg" CRLF
 * "Content-Range: bytes START1-END1/SIZE" CRLF
 * CRLF
 * ... data ...
 * CRLF
 * "--0123456789--" CRLF
 */


ngx_http_range_t;


ngx_http_range_filter_ctx_t;


static ngx_int_t ngx_http_range_parse(ngx_http_request_t *r,
    ngx_http_range_filter_ctx_t *ctx, ngx_uint_t ranges);
static ngx_int_t ngx_http_range_singlepart_header(ngx_http_request_t *r,
    ngx_http_range_filter_ctx_t *ctx);
static ngx_int_t ngx_http_range_multipart_header(ngx_http_request_t *r,
    ngx_http_range_filter_ctx_t *ctx);
static ngx_int_t ngx_http_range_not_satisfiable(ngx_http_request_t *r);
static ngx_int_t ngx_http_range_test_overlapped(ngx_http_request_t *r,
    ngx_http_range_filter_ctx_t *ctx, ngx_chain_t *in);
static ngx_int_t ngx_http_range_singlepart_body(ngx_http_request_t *r,
    ngx_http_range_filter_ctx_t *ctx, ngx_chain_t *in);
static ngx_int_t ngx_http_range_multipart_body(ngx_http_request_t *r,
    ngx_http_range_filter_ctx_t *ctx, ngx_chain_t *in);

static ngx_int_t ngx_http_range_header_filter_init(ngx_conf_t *cf);
static ngx_int_t ngx_http_range_body_filter_init(ngx_conf_t *cf);


static ngx_http_module_t  ngx_http_range_header_filter_module_ctx = …;


ngx_module_t  ngx_http_range_header_filter_module = …;


static ngx_http_module_t  ngx_http_range_body_filter_module_ctx = …;


ngx_module_t  ngx_http_range_body_filter_module = …;


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_range_header_filter(ngx_http_request_t *r)
{ … }


static ngx_int_t
ngx_http_range_parse(ngx_http_request_t *r, ngx_http_range_filter_ctx_t *ctx,
    ngx_uint_t ranges)
{ … }


static ngx_int_t
ngx_http_range_singlepart_header(ngx_http_request_t *r,
    ngx_http_range_filter_ctx_t *ctx)
{ … }


static ngx_int_t
ngx_http_range_multipart_header(ngx_http_request_t *r,
    ngx_http_range_filter_ctx_t *ctx)
{ … }


static ngx_int_t
ngx_http_range_not_satisfiable(ngx_http_request_t *r)
{ … }


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


static ngx_int_t
ngx_http_range_test_overlapped(ngx_http_request_t *r,
    ngx_http_range_filter_ctx_t *ctx, ngx_chain_t *in)
{ … }


static ngx_int_t
ngx_http_range_singlepart_body(ngx_http_request_t *r,
    ngx_http_range_filter_ctx_t *ctx, ngx_chain_t *in)
{ … }


static ngx_int_t
ngx_http_range_multipart_body(ngx_http_request_t *r,
    ngx_http_range_filter_ctx_t *ctx, ngx_chain_t *in)
{ … }


static ngx_int_t
ngx_http_range_header_filter_init(ngx_conf_t *cf)
{ … }


static ngx_int_t
ngx_http_range_body_filter_init(ngx_conf_t *cf)
{ … }