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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
static ngx_int_t ngx_http_chunked_filter_init(ngx_cycle_t *cycle);
static ngx_http_module_t ngx_http_chunked_filter_module_ctx = {
NULL, /* preconfiguration */
NULL, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
NULL, /* create location configuration */
NULL, /* merge location configuration */
};
ngx_module_t ngx_http_chunked_filter_module = {
NGX_MODULE_V1,
&ngx_http_chunked_filter_module_ctx, /* module context */
NULL, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init master */
ngx_http_chunked_filter_init, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
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_chunked_header_filter(ngx_http_request_t *r)
{
if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED || r->main) {
return ngx_http_next_header_filter(r);
}
if (r->headers_out.content_length_n == -1) {
if (r->http_version < NGX_HTTP_VERSION_11) {
r->keepalive = 0;
} else {
r->chunked = 1;
}
}
return ngx_http_next_header_filter(r);
}
static ngx_int_t
ngx_http_chunked_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
{
u_char *chunk;
off_t size;
ngx_buf_t *b;
ngx_chain_t out, tail, *cl, *tl, **ll;
if (in == NULL || !r->chunked || r->header_only) {
return ngx_http_next_body_filter(r, in);
}
out.buf = NULL;
ll = &out.next;
size = 0;
cl = in;
for ( ;; ) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http chunk: %d", ngx_buf_size(cl->buf));
size += ngx_buf_size(cl->buf);
if (cl->buf->flush || ngx_buf_in_memory(cl->buf) || cl->buf->in_file) {
tl = ngx_alloc_chain_link(r->pool);
if (tl == NULL) {
return NGX_ERROR;
}
tl->buf = cl->buf;
*ll = tl;
ll = &tl->next;
}
if (cl->next == NULL) {
break;
}
cl = cl->next;
}
if (size) {
b = ngx_calloc_buf(r->pool);
if (b == NULL) {
return NGX_ERROR;
}
/* the "0000000000000000" is 64-bit hexadimal string */
chunk = ngx_palloc(r->pool, sizeof("0000000000000000" CRLF) - 1);
if (chunk == NULL) {
return NGX_ERROR;
}
b->temporary = 1;
b->pos = chunk;
b->last = ngx_sprintf(chunk, "%xO" CRLF, size);
out.buf = b;
}
if (cl->buf->last_buf) {
b = ngx_calloc_buf(r->pool);
if (b == NULL) {
return NGX_ERROR;
}
b->memory = 1;
b->last_buf = 1;
b->pos = (u_char *) CRLF "0" CRLF CRLF;
b->last = b->pos + 7;
cl->buf->last_buf = 0;
if (size == 0) {
b->pos += 2;
out.buf = b;
out.next = NULL;
return ngx_http_next_body_filter(r, &out);
}
} else {
if (size == 0) {
*ll = NULL;
return ngx_http_next_body_filter(r, out.next);
}
b = ngx_calloc_buf(r->pool);
if (b == NULL) {
return NGX_ERROR;
}
b->memory = 1;
b->pos = (u_char *) CRLF;
b->last = b->pos + 2;
}
tail.buf = b;
tail.next = NULL;
*ll = &tail;
return ngx_http_next_body_filter(r, &out);
}
static ngx_int_t
ngx_http_chunked_filter_init(ngx_cycle_t *cycle)
{
ngx_http_next_header_filter = ngx_http_top_header_filter;
ngx_http_top_header_filter = ngx_http_chunked_header_filter;
ngx_http_next_body_filter = ngx_http_top_body_filter;
ngx_http_top_body_filter = ngx_http_chunked_body_filter;
return NGX_OK;
}
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