mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-08 00:45:34 +02:00
340 lines
9.6 KiB
C
340 lines
9.6 KiB
C
/*
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* URL utility functions
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* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* 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
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* 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
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* 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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*/
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#include "avformat.h"
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#include "internal.h"
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#include "config.h"
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#include "url.h"
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#if CONFIG_NETWORK
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#include "network.h"
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#endif
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#include "libavutil/avassert.h"
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#include "libavutil/avstring.h"
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/**
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* @file
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* URL utility functions.
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*/
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int ff_url_join(char *str, int size, const char *proto,
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const char *authorization, const char *hostname,
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int port, const char *fmt, ...)
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{
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#if CONFIG_NETWORK
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struct addrinfo hints = { 0 }, *ai;
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#endif
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str[0] = '\0';
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if (proto)
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av_strlcatf(str, size, "%s://", proto);
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if (authorization && authorization[0])
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av_strlcatf(str, size, "%s@", authorization);
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#if CONFIG_NETWORK && defined(AF_INET6)
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/* Determine if hostname is a numerical IPv6 address,
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* properly escape it within [] in that case. */
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hints.ai_flags = AI_NUMERICHOST;
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if (!getaddrinfo(hostname, NULL, &hints, &ai)) {
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if (ai->ai_family == AF_INET6) {
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av_strlcat(str, "[", size);
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av_strlcat(str, hostname, size);
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av_strlcat(str, "]", size);
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} else {
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av_strlcat(str, hostname, size);
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}
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freeaddrinfo(ai);
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} else
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#endif
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/* Not an IPv6 address, just output the plain string. */
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av_strlcat(str, hostname, size);
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if (port >= 0)
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av_strlcatf(str, size, ":%d", port);
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if (fmt) {
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va_list vl;
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size_t len = strlen(str);
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va_start(vl, fmt);
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vsnprintf(str + len, size > len ? size - len : 0, fmt, vl);
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va_end(vl);
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}
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return strlen(str);
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}
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static const char *find_delim(const char *delim, const char *cur, const char *end)
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{
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while (cur < end && !strchr(delim, *cur))
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cur++;
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return cur;
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}
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int ff_url_decompose(URLComponents *uc, const char *url, const char *end)
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{
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const char *cur, *aend, *p;
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av_assert0(url);
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if (!end)
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end = url + strlen(url);
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cur = uc->url = url;
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/* scheme */
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uc->scheme = cur;
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p = find_delim(":/?#", cur, end); /* lavf "schemes" can contain options but not some RFC 3986 delimiters */
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if (*p == ':')
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cur = p + 1;
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/* authority */
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uc->authority = cur;
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if (end - cur >= 2 && cur[0] == '/' && cur[1] == '/') {
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cur += 2;
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aend = find_delim("/?#", cur, end);
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/* userinfo */
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uc->userinfo = cur;
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p = find_delim("@", cur, aend);
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if (*p == '@')
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cur = p + 1;
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/* host */
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uc->host = cur;
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if (*cur == '[') { /* hello IPv6, thanks for using colons! */
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p = find_delim("]", cur, aend);
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if (*p != ']')
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return AVERROR(EINVAL);
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if (p + 1 < aend && p[1] != ':')
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return AVERROR(EINVAL);
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cur = p + 1;
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} else {
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cur = find_delim(":", cur, aend);
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}
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/* port */
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uc->port = cur;
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cur = aend;
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} else {
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uc->userinfo = uc->host = uc->port = cur;
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}
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/* path */
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uc->path = cur;
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cur = find_delim("?#", cur, end);
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/* query */
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uc->query = cur;
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if (*cur == '?')
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cur = find_delim("#", cur, end);
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/* fragment */
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uc->fragment = cur;
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uc->end = end;
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return 0;
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}
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static int is_fq_dos_path(const char *path)
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{
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if ((path[0] >= 'a' && path[0] <= 'z' || path[0] >= 'A' && path[0] <= 'Z') &&
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path[1] == ':' &&
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(path[2] == '/' || path[2] == '\\'))
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return 1;
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if ((path[0] == '/' || path[0] == '\\') &&
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(path[1] == '/' || path[1] == '\\'))
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return 1;
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return 0;
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}
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static int append_path(char *root, char *out_end, char **rout,
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const char *in, const char *in_end)
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{
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char *out = *rout;
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const char *d, *next;
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if (in < in_end && *in == '/')
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in++; /* already taken care of */
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while (in < in_end) {
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d = find_delim("/", in, in_end);
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next = d + (d < in_end && *d == '/');
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if (d - in == 1 && in[0] == '.') {
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/* skip */
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} else if (d - in == 2 && in[0] == '.' && in[1] == '.') {
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av_assert1(out[-1] == '/');
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if (out - root > 1)
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while (out > root && (--out)[-1] != '/');
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} else {
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if (out_end - out < next - in)
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return AVERROR(ENOMEM);
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memmove(out, in, next - in);
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out += next - in;
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}
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in = next;
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}
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*rout = out;
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return 0;
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}
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int ff_make_absolute_url2(char *buf, int size, const char *base,
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const char *rel, int handle_dos_paths)
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{
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URLComponents ub, uc;
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char *out, *out_end, *path;
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const char *keep, *base_path_end;
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int use_base_path, simplify_path = 0, ret;
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const char *base_separators = "/";
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/* This is tricky.
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For HTTP, http://server/site/page + ../media/file
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should resolve into http://server/media/file
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but for filesystem access, dir/playlist + ../media/file
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should resolve into dir/../media/file
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because dir could be a symlink, and .. points to
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the actual parent of the target directory.
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We'll consider that URLs with an actual scheme and authority,
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i.e. starting with scheme://, need parent dir simplification,
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while bare paths or pseudo-URLs starting with proto: without
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the double slash do not.
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For real URLs, the processing is similar to the algorithm described
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here:
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https://tools.ietf.org/html/rfc3986#section-5
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*/
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if (!size)
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return AVERROR(ENOMEM);
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out = buf;
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out_end = buf + size - 1;
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if (!base)
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base = "";
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if (handle_dos_paths) {
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if ((ret = ff_url_decompose(&ub, base, NULL)) < 0)
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goto error;
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if (is_fq_dos_path(base) || av_strstart(base, "file:", NULL) || ub.path == ub.url) {
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base_separators = "/\\";
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if (is_fq_dos_path(rel))
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base = "";
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}
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}
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if ((ret = ff_url_decompose(&ub, base, NULL)) < 0 ||
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(ret = ff_url_decompose(&uc, rel, NULL)) < 0)
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goto error;
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keep = ub.url;
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#define KEEP(component, also) do { \
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if (uc.url_component_end_##component == uc.url && \
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ub.url_component_end_##component > keep) { \
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keep = ub.url_component_end_##component; \
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also \
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} \
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} while (0)
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KEEP(scheme, );
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KEEP(authority_full, simplify_path = 1;);
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KEEP(path,);
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KEEP(query,);
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KEEP(fragment,);
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#undef KEEP
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#define COPY(start, end) do { \
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size_t len = end - start; \
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if (len > out_end - out) { \
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ret = AVERROR(ENOMEM); \
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goto error; \
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} \
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memmove(out, start, len); \
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out += len; \
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} while (0)
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COPY(ub.url, keep);
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COPY(uc.url, uc.path);
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use_base_path = URL_COMPONENT_HAVE(ub, path) && keep <= ub.path;
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if (uc.path > uc.url)
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use_base_path = 0;
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if (URL_COMPONENT_HAVE(uc, path) && uc.path[0] == '/')
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use_base_path = 0;
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if (use_base_path) {
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base_path_end = ub.url_component_end_path;
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if (URL_COMPONENT_HAVE(uc, path))
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while (base_path_end > ub.path && !strchr(base_separators, base_path_end[-1]))
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base_path_end--;
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}
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if (keep > ub.path)
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simplify_path = 0;
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if (URL_COMPONENT_HAVE(uc, scheme))
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simplify_path = 0;
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if (URL_COMPONENT_HAVE(uc, authority))
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simplify_path = 1;
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/* No path at all, leave it */
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if (!use_base_path && !URL_COMPONENT_HAVE(uc, path))
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simplify_path = 0;
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if (simplify_path) {
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const char *root = "/";
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COPY(root, root + 1);
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path = out;
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if (use_base_path) {
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ret = append_path(path, out_end, &out, ub.path, base_path_end);
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if (ret < 0)
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goto error;
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}
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if (URL_COMPONENT_HAVE(uc, path)) {
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ret = append_path(path, out_end, &out, uc.path, uc.url_component_end_path);
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if (ret < 0)
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goto error;
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}
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} else {
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if (use_base_path)
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COPY(ub.path, base_path_end);
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COPY(uc.path, uc.url_component_end_path);
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}
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COPY(uc.url_component_end_path, uc.end);
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#undef COPY
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*out = 0;
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return 0;
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error:
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snprintf(buf, size, "invalid:%s",
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ret == AVERROR(ENOMEM) ? "truncated" :
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ret == AVERROR(EINVAL) ? "syntax_error" : "");
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return ret;
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}
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int ff_make_absolute_url(char *buf, int size, const char *base,
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const char *rel)
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{
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return ff_make_absolute_url2(buf, size, base, rel, HAVE_DOS_PATHS);
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}
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AVIODirEntry *ff_alloc_dir_entry(void)
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{
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AVIODirEntry *entry = av_mallocz(sizeof(AVIODirEntry));
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if (entry) {
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entry->type = AVIO_ENTRY_UNKNOWN;
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entry->size = -1;
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entry->modification_timestamp = -1;
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entry->access_timestamp = -1;
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entry->status_change_timestamp = -1;
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entry->user_id = -1;
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entry->group_id = -1;
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entry->filemode = -1;
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}
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return entry;
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}
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