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/*
* TCP protocol |
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* Copyright (c) 2002 Fabrice Bellard |
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* |
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* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/
#include "avformat.h" |
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#include "libavutil/parseutils.h" |
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#include "libavutil/opt.h" |
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#include "internal.h" |
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#include "network.h" |
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#include "os_support.h" |
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#include "url.h" |
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#if HAVE_POLL_H
#include <poll.h> |
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#endif |
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typedef struct TCPContext { |
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const AVClass *class; |
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int fd; |
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int listen;
int rw_timeout;
int listen_timeout; |
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} TCPContext;
|
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#define OFFSET(x) offsetof(TCPContext, x)
#define D AV_OPT_FLAG_DECODING_PARAM
#define E AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{"listen", "listen on port instead of connecting", OFFSET(listen), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E },
{"timeout", "timeout of socket i/o operations", OFFSET(rw_timeout), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D|E },
{"listen_timeout", "connection awaiting timeout", OFFSET(listen_timeout), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, D|E },
{NULL}
};
static const AVClass tcp_context_class = {
.class_name = "tcp",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
|
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/* return non zero if error */
static int tcp_open(URLContext *h, const char *uri, int flags)
{ |
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struct addrinfo hints = { 0 }, *ai, *cur_ai; |
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int port, fd = -1; |
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TCPContext *s = h->priv_data; |
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const char *p;
char buf[256]; |
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int ret; |
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socklen_t optlen; |
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char hostname[1024],proto[1024],path[1024]; |
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char portstr[10]; |
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h->rw_timeout = 5000000; |
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|
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av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname), |
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&port, path, sizeof(path), uri); |
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if (strcmp(proto, "tcp")) |
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return AVERROR(EINVAL); |
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if (port <= 0 || port >= 65536) {
av_log(h, AV_LOG_ERROR, "Port missing in uri\n");
return AVERROR(EINVAL);
} |
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p = strchr(uri, '?');
if (p) {
if (av_find_info_tag(buf, sizeof(buf), "listen", p)) |
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s->listen = 1; |
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if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) { |
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s->rw_timeout = strtol(buf, NULL, 10); |
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} |
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if (av_find_info_tag(buf, sizeof(buf), "listen_timeout", p)) { |
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s->listen_timeout = strtol(buf, NULL, 10); |
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} |
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} |
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h->rw_timeout = s->rw_timeout; |
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hints.ai_family = AF_UNSPEC; |
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hints.ai_socktype = SOCK_STREAM;
snprintf(portstr, sizeof(portstr), "%d", port); |
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if (s->listen) |
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hints.ai_flags |= AI_PASSIVE; |
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if (!hostname[0])
ret = getaddrinfo(NULL, portstr, &hints, &ai);
else
ret = getaddrinfo(hostname, portstr, &hints, &ai); |
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if (ret) { |
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av_log(h, AV_LOG_ERROR, |
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"Failed to resolve hostname %s: %s\n",
hostname, gai_strerror(ret)); |
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return AVERROR(EIO); |
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} |
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|
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cur_ai = ai;
restart: |
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ret = AVERROR(EIO); |
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fd = socket(cur_ai->ai_family, cur_ai->ai_socktype, cur_ai->ai_protocol); |
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if (fd < 0) |
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goto fail; |
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|
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if (s->listen) { |
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int fd1; |
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int reuse = 1; |
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struct pollfd lp = { fd, POLLIN, 0 }; |
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setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)); |
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ret = bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen); |
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if (ret) {
ret = ff_neterrno();
goto fail1;
} |
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ret = listen(fd, 1);
if (ret) {
ret = ff_neterrno();
goto fail1;
} |
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ret = poll(&lp, 1, s->listen_timeout >= 0 ? s->listen_timeout : -1); |
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if (ret <= 0) {
ret = AVERROR(ETIMEDOUT);
goto fail1;
} |
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fd1 = accept(fd, NULL, NULL); |
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if (fd1 < 0) {
ret = ff_neterrno();
goto fail1;
} |
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closesocket(fd);
fd = fd1; |
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ff_socket_nonblock(fd, 1); |
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} else { |
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redo: |
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ff_socket_nonblock(fd, 1); |
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ret = connect(fd, cur_ai->ai_addr, cur_ai->ai_addrlen);
}
|
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if (ret < 0) { |
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struct pollfd p = {fd, POLLOUT, 0}; |
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int64_t wait_started; |
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ret = ff_neterrno();
if (ret == AVERROR(EINTR)) { |
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if (ff_check_interrupt(&h->interrupt_callback)) { |
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ret = AVERROR_EXIT; |
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goto fail1; |
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} |
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goto redo; |
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} |
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if (ret != AVERROR(EINPROGRESS) &&
ret != AVERROR(EAGAIN)) |
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goto fail; |
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|
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/* wait until we are connected or until abort */ |
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wait_started = av_gettime();
do { |
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if (ff_check_interrupt(&h->interrupt_callback)) { |
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ret = AVERROR_EXIT; |
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goto fail1;
} |
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ret = poll(&p, 1, 100);
if (ret > 0) |
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break; |
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} while (!h->rw_timeout || (av_gettime() - wait_started < h->rw_timeout)); |
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if (ret <= 0) {
ret = AVERROR(ETIMEDOUT);
goto fail;
} |
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/* test error */
optlen = sizeof(ret); |
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if (getsockopt (fd, SOL_SOCKET, SO_ERROR, &ret, &optlen))
ret = AVUNERROR(ff_neterrno()); |
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if (ret != 0) { |
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char errbuf[100];
ret = AVERROR(ret);
av_strerror(ret, errbuf, sizeof(errbuf)); |
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av_log(h, AV_LOG_ERROR, |
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"TCP connection to %s:%d failed: %s\n", |
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hostname, port, errbuf); |
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goto fail; |
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} |
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} |
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h->is_streamed = 1; |
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s->fd = fd; |
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freeaddrinfo(ai); |
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return 0;
fail: |
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if (cur_ai->ai_next) {
/* Retry with the next sockaddr */
cur_ai = cur_ai->ai_next;
if (fd >= 0)
closesocket(fd);
goto restart;
} |
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fail1: |
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if (fd >= 0) |
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closesocket(fd); |
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freeaddrinfo(ai); |
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return ret; |
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}
|
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static int tcp_read(URLContext *h, uint8_t *buf, int size) |
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{
TCPContext *s = h->priv_data; |
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int ret; |
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|
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if (!(h->flags & AVIO_FLAG_NONBLOCK)) { |
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ret = ff_network_wait_fd_timeout(s->fd, 0, h->rw_timeout, &h->interrupt_callback);
if (ret) |
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return ret; |
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} |
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ret = recv(s->fd, buf, size, 0);
return ret < 0 ? ff_neterrno() : ret; |
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}
|
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static int tcp_write(URLContext *h, const uint8_t *buf, int size) |
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{
TCPContext *s = h->priv_data; |
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int ret; |
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|
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if (!(h->flags & AVIO_FLAG_NONBLOCK)) { |
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ret = ff_network_wait_fd_timeout(s->fd, 1, h->rw_timeout, &h->interrupt_callback);
if (ret) |
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return ret; |
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} |
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ret = send(s->fd, buf, size, 0);
return ret < 0 ? ff_neterrno() : ret; |
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}
|
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static int tcp_shutdown(URLContext *h, int flags)
{
TCPContext *s = h->priv_data;
int how;
if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) {
how = SHUT_RDWR;
} else if (flags & AVIO_FLAG_WRITE) {
how = SHUT_WR;
} else {
how = SHUT_RD;
}
return shutdown(s->fd, how);
}
|
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static int tcp_close(URLContext *h)
{
TCPContext *s = h->priv_data; |
9ddd71fc |
closesocket(s->fd); |
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return 0;
}
|
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static int tcp_get_file_handle(URLContext *h)
{
TCPContext *s = h->priv_data;
return s->fd;
}
|
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URLProtocol ff_tcp_protocol = { |
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.name = "tcp",
.url_open = tcp_open,
.url_read = tcp_read,
.url_write = tcp_write,
.url_close = tcp_close, |
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.url_get_file_handle = tcp_get_file_handle, |
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.url_shutdown = tcp_shutdown, |
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.priv_data_size = sizeof(TCPContext), |
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.priv_data_class = &tcp_context_class, |
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.flags = URL_PROTOCOL_FLAG_NETWORK, |
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}; |