url.c 4.23 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113
/*
 * URL utility functions
 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
 *
 * This file is part of Libav.
 *
 * Libav is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * Libav is distributed in the hope that it will be useful,
 * 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
 * License along with Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */


#include "avformat.h"
#include "config.h"
#include "url.h"
#if CONFIG_NETWORK
#include "network.h"
#endif
#include "libavutil/avstring.h"

/**
 * @file
 * URL utility functions.
 */

int ff_url_join(char *str, int size, const char *proto,
                const char *authorization, const char *hostname,
                int port, const char *fmt, ...)
{
#if CONFIG_NETWORK
    struct addrinfo hints = { 0 }, *ai;
#endif

    str[0] = '\0';
    if (proto)
        av_strlcatf(str, size, "%s://", proto);
    if (authorization && authorization[0])
        av_strlcatf(str, size, "%s@", authorization);
#if CONFIG_NETWORK && defined(AF_INET6)
    /* Determine if hostname is a numerical IPv6 address,
     * properly escape it within [] in that case. */
    hints.ai_flags = AI_NUMERICHOST;
    if (!getaddrinfo(hostname, NULL, &hints, &ai)) {
        if (ai->ai_family == AF_INET6) {
            av_strlcat(str, "[", size);
            av_strlcat(str, hostname, size);
            av_strlcat(str, "]", size);
        } else {
            av_strlcat(str, hostname, size);
        }
        freeaddrinfo(ai);
    } else
#endif
        /* Not an IPv6 address, just output the plain string. */
        av_strlcat(str, hostname, size);

    if (port >= 0)
        av_strlcatf(str, size, ":%d", port);
    if (fmt) {
        va_list vl;
        int len = strlen(str);

        va_start(vl, fmt);
        vsnprintf(str + len, size > len ? size - len : 0, fmt, vl);
        va_end(vl);
    }
    return strlen(str);
}

void ff_make_absolute_url(char *buf, int size, const char *base,
                          const char *rel)
{
    char *sep, *path_query;
    /* Absolute path, relative to the current server */
    if (base && strstr(base, "://") && rel[0] == '/') {
        if (base != buf)
            av_strlcpy(buf, base, size);
        sep = strstr(buf, "://");
        if (sep) {
            /* Take scheme from base url */
            if (rel[1] == '/') {
                sep[1] = '\0';
            } else {
                /* Take scheme and host from base url */
                sep += 3;
                sep = strchr(sep, '/');
                if (sep)
                    *sep = '\0';
            }
        }
        av_strlcat(buf, rel, size);
        return;
    }
    /* If rel actually is an absolute url, just copy it */
    if (!base || strstr(rel, "://") || rel[0] == '/') {
        av_strlcpy(buf, rel, size);
        return;
    }
    if (base != buf)
        av_strlcpy(buf, base, size);

    /* Strip off any query string from base */
    path_query = strchr(buf, '?');
114
    if (path_query)
115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147
        *path_query = '\0';

    /* Is relative path just a new query part? */
    if (rel[0] == '?') {
        av_strlcat(buf, rel, size);
        return;
    }

    /* Remove the file name from the base url */
    sep = strrchr(buf, '/');
    if (sep)
        sep[1] = '\0';
    else
        buf[0] = '\0';
    while (av_strstart(rel, "../", NULL) && sep) {
        /* Remove the path delimiter at the end */
        sep[0] = '\0';
        sep = strrchr(buf, '/');
        /* If the next directory name to pop off is "..", break here */
        if (!strcmp(sep ? &sep[1] : buf, "..")) {
            /* Readd the slash we just removed */
            av_strlcat(buf, "/", size);
            break;
        }
        /* Cut off the directory name */
        if (sep)
            sep[1] = '\0';
        else
            buf[0] = '\0';
        rel += 3;
    }
    av_strlcat(buf, rel, size);
}