Function DetectPercentEncode

Source/MediaInfo/Reader/Reader_libcurl.cpp:286–349

    return Result;
}
MediaInfo_Config::urlencode DetectPercentEncode(const string& In, bool AcceptSlash=false)
{
    MediaInfo_Config::urlencode Result=MediaInfo_Config::URLEncode_Guess;
    for (string::size_type i=0; i<In.size(); i++)
    {
        char C=In[i];
        switch (C)
        {
            case '%':
            {
                if (i+2>In.size())
                    return MediaInfo_Config::URLEncode_No;
                char C1=In[++i];
                if (!((C1>='0' && C1<='9')
                   || (C1>='A' && C1<='F')
                   || (C1>='a' && C1<='f')))
                    return MediaInfo_Config::URLEncode_No;
                char C2=In[++i];
                if (!((C2>='0' && C2<='9')
                   || (C2>='A' && C2<='F')
                   || (C2>='a' && C2<='f')))
                    return MediaInfo_Config::URLEncode_No;
                Result=MediaInfo_Config::URLEncode_Yes;
                continue;
            }
            case '+': // Often used as space separator
            case '\'':
            case '!':
            case '(':
            case ')':
            case '*':
                continue;
            case ';':
            case ':':
            case '@':
            case '&':
            case '=':
            case '$':
            case ',':
            case '?':
            case '#':
            case '[':
            case ']':
                return MediaInfo_Config::URLEncode_No;
            case '/':
                if (AcceptSlash)
                    continue;
                return MediaInfo_Config::URLEncode_No;
            default:
                if (!((C>='0' && C<='9')
                   || (C>='A' && C<='Z')
                   || (C>='a' && C<='z')
                   || C=='-'
                   || C=='.'
                   || C=='_'
                   || C=='~'))
                {
                    if (Result!=MediaInfo_Config::URLEncode_Yes)