/*
  * URL utility functions
  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
  *

  * This file is part of FFmpeg.

  *

  * FFmpeg 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.
  *

  * FFmpeg 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 FFmpeg; 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;

         size_t 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, '?');

     if (path_query)

         *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);
 }

 
 AVIODirEntry *ff_alloc_dir_entry(void)
 {
     AVIODirEntry *entry = av_mallocz(sizeof(AVIODirEntry));
     if (entry) {
         entry->type = AVIO_ENTRY_UNKNOWN;
         entry->size = -1;
         entry->modification_timestamp = -1;
         entry->access_timestamp = -1;
         entry->status_change_timestamp = -1;
         entry->user_id = -1;
         entry->group_id = -1;
         entry->filemode = -1;
     }
     return entry;
 }