UrlDecode.cpp

Go to the documentation of this file.

/*!********************************************************************
 
 Audacity: A Digital Audio Editor
 
 @file UrlDecode.cpp
 @brief Define a function to decode an URL encode string.
 
 Dmitry Vedenko
 **********************************************************************/
 
#include "UrlDecode.h"
 
#include "HexHelpers.h"
 
namespace audacity
{
 
std::string UrlDecode (const std::string& url)
{
    std::string result;
 
    const size_t length = url.length ();
 
    for (auto it = url.begin (), end = url.end (); it != end; ++it)
    {
        const char c = *it; 
 
        if (c != '%')
        {
            result.push_back (c);
        }
        else
        {
            if (++it == url.end ())
                break; // Malformed input string
 
            const char c1 = *it; 
            
            if (++it == url.end ())
                break; // Malformed input string
 
            const char c2 = *it;
 
            result.push_back (HexCharToNum (c1) << 4 | HexCharToNum (c2));
        }
    }
 
    return result;
}
 
}