Class: Mobi::Metadata

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/mobi/metadata.rb

Defined Under Namespace

Classes: InvalidMobi

Constant Summary collapse

EXTH_RECORDS = 
%w(author publisher imprint description isbn subject
published_at review contributor rights subject_code type
source asin version)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file) ⇒ Metadata

Returns a new instance of Metadata.

Raises:



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# File 'lib/mobi/metadata.rb', line 16

def initialize(file)
  @file = file
  @data = StreamSlicer.new(file)

  raise InvalidMobi, "The supplied file is not in a valid mobi format" unless bookmobi?

  @record_zero_stream = MetadataStreams.record_zero_stream(file)
  @palm_doc_header    = Header::PalmDocHeader.new @record_zero_stream
  @mobi_header        = Header::MobiHeader.new @record_zero_stream

  @exth_stream = MetadataStreams.exth_stream(file, @mobi_header.header_length)
  @exth_header = Header::ExthHeader.new @exth_stream
end

Instance Attribute Details

#data ⇒ Object (readonly)

Raw data stream



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# File 'lib/mobi/metadata.rb', line 12

def data
  @data
end

#exth_header ⇒ Object (readonly)

Individual header classes for your reading pleasure.



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# File 'lib/mobi/metadata.rb', line 14

def exth_header
  @exth_header
end

#mobi_header ⇒ Object (readonly)

Individual header classes for your reading pleasure.



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# File 'lib/mobi/metadata.rb', line 14

def mobi_header
  @mobi_header
end

#palm_doc_header ⇒ Object (readonly)

Individual header classes for your reading pleasure.



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# File 'lib/mobi/metadata.rb', line 14

def palm_doc_header
  @palm_doc_header
end

Instance Method Details

#bookmobi? ⇒ Boolean

Determines if the file is a valid mobi file.

Returns true if the file is a valid MOBI.

Returns:

  • (Boolean) 


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# File 'lib/mobi/metadata.rb', line 45

def bookmobi?
  @data[60, 8] == "BOOKMOBI"
end

#title ⇒ Object

Gets the title of the book.

Returns a String.



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# File 'lib/mobi/metadata.rb', line 33

def title
  return @title if @title

  offset = @mobi_header.full_name_offset
  length = @mobi_header.full_name_length

  @title = @record_zero_stream[offset, length]
end