Function HasFileExt

LASzip/src/mydefs.cpp:455–466

Check if file has a certain file extension (case insensitive) filename extension, like ".laz" or "laz" TRUE if filename has the given extension

/// <param name="ext">extension, like ".laz" or "laz"</param>
/// <returns>TRUE if filename has the given extension</returns>
bool HasFileExt(std::string fn, std::string ext) {
  if (fn.empty()) return false;
  if (ext.empty()) return false;
  // if fn does not have a ext: it is maybe just an ext - compare those
  if ((fn.length() == ext.length()) || (fn.find_last_of(".") == std::string::npos)) {
    return fn.compare(ext) == 0;
  }
  if (ext[0] != '.') ext = '.' + ext;
  to_lower(ext);
  to_lower(fn);
  return (fn.substr(fn.find_last_of(".")) == ext);
}

// replace file extension of input_file with new extension (with or without leading '.')
std::string FileExtSet(std::string fn_in, std::string ext_new) {