Method CreateFromFile

src/OpenColorIO/Config.cpp:1154–1207

}

ConstConfigRcPtr Config::CreateFromFile(const char * filename)
{
    if (!filename || !*filename)
    {
        throw ExceptionMissingFile ("The config filepath is missing.");
    }

    // Check for URI Pattern: ocio://<config name>
    static const std::regex uriPattern(R"(ocio:\/\/([^\s]+))");
    std::smatch match;
    const std::string uri = filename;
    if (std::regex_search(uri, match, uriPattern))
    {
        return CreateFromBuiltinConfig(uri.c_str());
    }

    std::ifstream ifstream = Platform::CreateInputFileStream(
        filename, 
        std::ios_base::in | std::ios_base::binary
    );

    if (ifstream.fail())
    {
        std::ostringstream os;
        os << "Error could not read '" << filename;
        os << "' OCIO profile.";
        throw Exception (os.str().c_str());
    }

    char magicNumber[2] = { 0 };
    if (ifstream.read(magicNumber, 2))
    {
        // Check if it is an OCIOZ archive.
        if (magicNumber[0] == 'P' && magicNumber[1] == 'K')
        {
            // Closing ifstream even though it should be closed by ifstream destructor (RAII).
            ifstream.close();

            // The file should be an OCIOZ archive file.

            auto ciop = std::make_shared<CIOPOciozArchive>();
            // Store archive absolute path.
            ciop->setArchiveAbsPath(filename);
            // Build the entries map.
            ciop->buildEntries();
            return CreateFromConfigIOProxy(ciop);
        }
    } 

    // Not an OCIOZ archive. Continue as usual.
    ifstream.clear();
    ifstream.seekg(0);
    return Config::Impl::Read(ifstream, filename);
}

ConstConfigRcPtr Config::CreateFromStream(std::istream & istream)
{