Class: Libis::Format::Fido

Inherits:
Object
  • Object
show all
Includes:
Tools::Logger
Defined in:
lib/libis/format/fido.rb

Constant Summary collapse

BAD_MIMETYPES = 
[nil, '', 'None', 'application/octet-stream']

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.add_format(f) ⇒ Object 



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# File 'lib/libis/format/fido.rb', line 78

def self.add_format(f)
  instance.formats << f
end

.formats ⇒ Object 



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# File 'lib/libis/format/fido.rb', line 82

def self.formats
  instance.formats
end

.run(file, formats = nil) ⇒ Object 



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# File 'lib/libis/format/fido.rb', line 18

def self.run(file, formats = nil)
  self.new.run file, formats
end

Instance Method Details

#run(file, xtra_formats = nil) ⇒ Object 



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# File 'lib/libis/format/fido.rb', line 22

def run(file, xtra_formats = nil)

  fido_results = []

  fmt_list = formats.dup
  case xtra_formats
    when Array
      fmt_list += xtra_formats
    when String
      fmt_list << xtra_formats
    else
      # do nothing
  end

  args = []
  args << '-loadformats' << "#{fmt_list.join(',')}" unless fmt_list.empty?
  args << "#{file.escape_for_string}"
  fido = ::Libis::Tools::Command.run(Libis::Format::Config[:fido_path], *args)
  warn "Fido errors: #{fido[:err].join("\n")}" unless fido[:err].empty?

  keys = [:status, :time, :puid, :format_name, :signature_name, :filesize, :filename, :mimetype, :matchtype]
  fido_output = CSV.parse(fido[:out].join("\n")).map { |a| Hash[keys.zip(a)] }

  fido_output.each do |x|
    if x[:status] == 'OK'
      x[:mimetype] = get_mimetype(x[:puid]) if x[:mimetype] == 'None'
      next if BAD_MIMETYPES.include? x[:mimetype]
      x[:score] = 5
      case x[:matchtype]
        when 'signature'
          x[:score] += 5
        when 'container'
          typeinfo = ::Libis::Format::TypeDatabase.puid_typeinfo(x[:puid])
          ext = File.extname(file)
          x[:score] += 2 if typeinfo and typeinfo[:EXTENSIONS].include?(ext)
        else
          # do nothing
      end
      fido_results << x
    end
  end

  fido_results = fido_results.inject({}) do |result, value|
    result[value[:score]] ||= []
    result[value[:score]] << value
    result
  end

  max_score = fido_results.keys.max

  # Only if we find a single hit of type 'signature' or 'container', we are confident enough to return a result
  return {} unless max_score and max_score >= 5 && fido_results[max_score].size == 1

  fido_results[max_score].first
end