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  1. /*
  2.  * Simple URL decoding function
  3.  * Copyright (c) 2012 Antti Seppälä
  4.  *
  5.  * References:
  6.  *  RFC 3986: Uniform Resource Identifier (URI): Generic Syntax
  7.  *       T. Berners-Lee et al. The Internet Society, 2005
  8.  *
  9.  * based on http://www.icosaedro.it/apache/urldecode.c
  10.  *          from Umberto Salsi (salsi@icosaedro.it)
  11.  *
  12.  * This file is part of FFmpeg.
  13.  *
  14.  * FFmpeg is free software; you can redistribute it and/or
  15.  * modify it under the terms of the GNU Lesser General Public
  16.  * License as published by the Free Software Foundation; either
  17.  * version 2.1 of the License, or (at your option) any later version.
  18.  *
  19.  * FFmpeg is distributed in the hope that it will be useful,
  20.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  22.  * Lesser General Public License for more details.
  23.  *
  24.  * You should have received a copy of the GNU Lesser General Public
  25.  * License along with FFmpeg; if not, write to the Free Software
  26.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  27.  */
  28.  
  29. #include <string.h>
  30.  
  31. #include "libavutil/mem.h"
  32. #include "libavutil/avstring.h"
  33. #include "urldecode.h"
  34.  
  35. char *ff_urldecode(const char *url)
  36. {
  37.     int s = 0, d = 0, url_len = 0;
  38.     char c;
  39.     char *dest = NULL;
  40.  
  41.     if (!url)
  42.         return NULL;
  43.  
  44.     url_len = strlen(url) + 1;
  45.     dest = av_malloc(url_len);
  46.  
  47.     if (!dest)
  48.         return NULL;
  49.  
  50.     while (s < url_len) {
  51.         c = url[s++];
  52.  
  53.         if (c == '%' && s + 2 < url_len) {
  54.             char c2 = url[s++];
  55.             char c3 = url[s++];
  56.             if (av_isxdigit(c2) && av_isxdigit(c3)) {
  57.                 c2 = av_tolower(c2);
  58.                 c3 = av_tolower(c3);
  59.  
  60.                 if (c2 <= '9')
  61.                     c2 = c2 - '0';
  62.                 else
  63.                     c2 = c2 - 'a' + 10;
  64.  
  65.                 if (c3 <= '9')
  66.                     c3 = c3 - '0';
  67.                 else
  68.                     c3 = c3 - 'a' + 10;
  69.  
  70.                 dest[d++] = 16 * c2 + c3;
  71.  
  72.             } else { /* %zz or something other invalid */
  73.                 dest[d++] = c;
  74.                 dest[d++] = c2;
  75.                 dest[d++] = c3;
  76.             }
  77.         } else if (c == '+') {
  78.             dest[d++] = ' ';
  79.         } else {
  80.             dest[d++] = c;
  81.         }
  82.  
  83.     }
  84.  
  85.     return dest;
  86. }
  87.