class RubyXL::Parser

def self.parse_buffer(buffer)

Parse .xslx file contained in a stream (useful for receiving over HTTP). 
def self.parse_buffer(buffer)
  root = nil # Zip::File.open_buffer somehow fails to return the value from the block :(
  begin
    ::Zip::File.open_buffer(buffer) { |zip_file| root = RubyXL::WorkbookRoot.parse_zip_file(zip_file) }
    root.workbook
  rescue ::Zip::Error => e
    raise e, "XLSX file format error: #{e}", e.backtrace
  end
end