Method NormalizeFileName

source/common/filesystem/source/resourcefile.cpp:253–282

//==========================================================================

const char* FResourceFile::NormalizeFileName(const char* fn, int fallbackcp)
{
	if (!fn || !*fn) return "";
	auto norm = tolower_normalize(fn);
	if (!norm)
	{
		if (fallbackcp == 437)
		{
			std::vector<char> buffer;
			ibm437_to_utf8(fn, buffer);
			norm = tolower_normalize(buffer.data());
		}
		// maybe handle other codepages
		else
		{
			// if the filename is not valid UTF-8, nuke all bytes larger than 0x80 so that we still got something semi-usable
			std::string ffn = fn;
			for (auto& c : ffn)
			{
				if (c & 0x80) c = '@';
			}
			norm = tolower_normalize(&ffn.front());
		}
	}
	FixPathSeparator(norm);
	auto pooled = stringpool->Strdup(norm);
	free(norm);
	return pooled;

}

//==========================================================================
//