Module: Ms::Mascot::Dat::Archive::Utils

Included in:
Ms::Mascot::Dat::Archive
Defined in:
lib/ms/mascot/dat/archive.rb

Class Method Summary collapse

Class Method Details

.content_type_class(metadata) ⇒ Object

Resolves a content type class from a hash of metadata like:

metadata = {
  :content_type => 'application/x-Mascot',
  :section_name => 'header'
}
Dat.content_type_class(metadata)   # => Ms::Mascot::Dat::Header

Raises an error if the content type is not ‘application/x-Mascot’ or if the name is not registered in CONTENT_TYPE_CLASSES.



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# File 'lib/ms/mascot/dat/archive.rb', line 73

def content_type_class(metadata)
  unless metadata[:content_type] == 'application/x-Mascot'
    raise "unknown content_type: #{metadata.inspect}"
  end
  
  name = metadata[:section_name]
  name = 'query' if name =~ /^query(\d+)$/
  case const = CONTENT_TYPE_CLASSES[name]
  when String
    require const
    CONTENT_TYPE_CLASSES[name] = Dat.const_get(name.capitalize)
  else
    const
  end
end

.parse_content_type(str) ⇒ Object

Parses a mascot-style content type declaration. This method uses a simple regexp and is very brittle, but it works for all known dat files.



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# File 'lib/ms/mascot/dat/archive.rb', line 55

def parse_content_type(str)
  unless str =~ /^Content-Type: (.*?); name=\"(.*)\"/
    raise "unparseable content-type declaration: #{str.inspect}"
  end
  
  {:content_type => $1, :section_name => $2}
end

.parse_metadata(io) ⇒ Object

Parses a hash of metadata (content_type, boundary, etc) from io. parse_metadata does not reposition io.



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# File 'lib/ms/mascot/dat/archive.rb', line 29

def parse_metadata(io)
  current_pos = io.pos
  io.rewind
  
  metadata = {}
  line = io.readline
  unless line =~ /MIME-Version: (\d+\.\d+) \(Generated by Mascot version (\d+\.\d+)\)/
    raise "could not parse mime-version or mascot-version: #{line}"
  end
  metadata[:mime_version] = $1
  metadata[:mascot_version] = $2
  
  line = io.readline
  unless line =~ /Content-Type: (.*?); boundary=(.*)/
    raise "could not parse content-type: #{line}"
  end
  metadata[:content_type] = $1
  metadata[:boundary] = $2
  
  io.pos = current_pos
  metadata
end