class ActionDispatch::Http::UploadedFile

def encode_filename(filename)
  # Encode the filename in the utf8 encoding, unless it is nil or we're in 1.8
  if "ruby".encoding_aware? && filename
    filename.force_encoding("UTF-8").encode!
  else
    filename
  end
end

def initialize(hash)
  @original_filename = encode_filename(hash[:filename])
  @content_type      = hash[:type]
  @headers           = hash[:head]
  @tempfile          = hash[:tempfile]
  raise(ArgumentError, ':tempfile is required') unless @tempfile
end

def read(*args)
  @tempfile.read(*args)
end