module Sprockets::EncodingUtils

def detect_css(str)
  str = detect_unicode_bom(str)
  if name = scan_css_charset(str)
    encoding = Encoding.find(name)
    str = str.dup
    str.force_encoding(encoding)
    len = "@charset \"#{name}\";".encode(encoding).size
    str.slice!(0, len)
    str
  end
  # Fallback to UTF-8
  if str.encoding == Encoding::BINARY
    str.force_encoding(Encoding::UTF_8)
  end
  str
end