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url_decoder.cc

00001 /*
00002 *  Name:      url_decoder.hh
00003 *  Author:    Rafael Jesus Alcantara Perez
00004 *  Summary:   URL decoder class
00005 *  Date:      $Date: 2003/04/14 00:18:35 $
00006 *  Revision:  $Revision: 1.1 $
00007 *
00008 *  Copyright (C) 1994-2002  Rafael Jesus Alcantara Perez <rafa@dedalo-ing.com>
00009 *
00010 *  This program is free software; you can redistribute it and/or modify
00011 *  it under the terms of the GNU General Public License as published by
00012 *  the Free Software Foundation; either version 2 of the License, or
00013 *  (at your option) any later version.
00014 *
00015 *  This program is distributed in the hope that it will be useful,
00016 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00017 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00018 *  GNU General Public License for more details.
00019 *
00020 *  You should have received a copy of the GNU General Public License
00021 *  along with this program; if not, write to the Free Software
00022 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
00023 *  MA 02111-1307, USA.
00024 */
00025 
00026 #include <cctype>
00027 #include <cstdio>
00028 #include <mpcl/net/url_decoder.hh>
00029 
00030 
00031 //
00032 //  S E L E C T O R S
00033 //
00034 
00035 mpcl::text::TString mpcl::net::TUrlDecoder::
00036 _decode (const text::TString& rkySOURCE_ENCODED)
00037 {
00038 
00039   using std::strtol;
00040   using text::TString;
00041 
00042   static char    _acSourceHexBuffer[] = "%NN";
00043   static char    _acTargetHexBuffer[] = "0xNN";
00044   static char    _acConvertedBuffer[] = " ";
00045   static char*   _pcSourceHexDigits   = _acSourceHexBuffer + 1;
00046   static char*   _pcTargetHexDigits   = _acTargetHexBuffer + 2;
00047 
00048   size_t         zOffset  = 0;
00049   TString        yDecoded = rkySOURCE_ENCODED;
00050   
00051   yDecoded.replaceAll ('+', ' ');
00052 
00053   //
00054   //  Replace hexadecimal escape patterns, by their
00055   //  ASCII values.
00056   //
00057   for (zOffset = 0; ( TString::npos != (zOffset = yDecoded.find ('%')) ) ;)
00058   {
00059     _pcTargetHexDigits [0] = (_pcSourceHexDigits [0] = yDecoded [zOffset + 1]);
00060     _pcTargetHexDigits [1] = (_pcSourceHexDigits [1] = yDecoded [zOffset + 2]);
00061     _acConvertedBuffer [0] = strtol (_acTargetHexBuffer, NULL, 16);
00062     yDecoded.replaceAll (_acSourceHexBuffer, _acConvertedBuffer);
00063   }
00064   return yDecoded;
00065 
00066 }  // _decode()

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