Class: ID3Tag::Frames::V2::BasicFrame

Inherits:
Object
  • Object
show all
Defined in:
lib/id3tag/frames/v2/basic_frame.rb

Direct Known Subclasses

PictureFrame, TextFrame, UniqueFileIdFrame

Constant Summary collapse

DECOMPRESSED_SIZE_BYTE_COUNT = 
4
GROUP_BYTE_COUNT = 
1

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(id, content, flags, major_version_number) ⇒ BasicFrame

Returns a new instance of BasicFrame.



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# File 'lib/id3tag/frames/v2/basic_frame.rb', line 10

def initialize(id, content, flags, major_version_number)
  @id, @raw_content, @flags, @major_version_number = id.to_sym, content, flags, major_version_number
end

Instance Attribute Details

#id ⇒ Object (readonly)

Returns the value of attribute id.



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# File 'lib/id3tag/frames/v2/basic_frame.rb', line 8

def id
  @id
end

#raw_content ⇒ Object (readonly)

Returns the value of attribute raw_content.



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# File 'lib/id3tag/frames/v2/basic_frame.rb', line 8

def raw_content
  @raw_content
end

Instance Method Details

#compressed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/id3tag/frames/v2/basic_frame.rb', line 64

def compressed?
  frame_flags.compressed?
end

#content ⇒ Object 



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# File 'lib/id3tag/frames/v2/basic_frame.rb', line 14

def content
  usable_content
end

#data_length_indicator? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/id3tag/frames/v2/basic_frame.rb', line 80

def data_length_indicator?
  frame_flags.data_length_indicator?
end

#encrypted? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/id3tag/frames/v2/basic_frame.rb', line 68

def encrypted?
  frame_flags.encrypted?
end

#encryption_id ⇒ Object 



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# File 'lib/id3tag/frames/v2/basic_frame.rb', line 31

def encryption_id
  read_additional_info_byte(*position_and_count_of_encryption_id_bytes) if encrypted?
end

#final_size ⇒ Object 



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# File 'lib/id3tag/frames/v2/basic_frame.rb', line 42

def final_size
  pos, count = position_and_count_of_data_length_bytes
  if (compressed? || data_length_indicator?) && pos && count
    raw_content_io.seek(pos)
    SynchsafeInteger.decode(NumberUtil.convert_string_to_32bit_integer(raw_content_io.read(count)))
  else
    raw_content_io.size
  end
end

#group_id ⇒ Object 



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# File 'lib/id3tag/frames/v2/basic_frame.rb', line 27

def group_id
  read_additional_info_byte(*position_and_count_of_group_id_bytes) if grouped?
end

#grouped? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/id3tag/frames/v2/basic_frame.rb', line 72

def grouped?
  frame_flags.grouped?
end

#inspect ⇒ Object 



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# File 'lib/id3tag/frames/v2/basic_frame.rb', line 84

def inspect
  if inspectable_content
    "<#{self.class.name} #{id}: #{inspectable_content}>"
  else
    "<#{self.class.name} #{id}>"
  end
end

#inspectable_content ⇒ Object 



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# File 'lib/id3tag/frames/v2/basic_frame.rb', line 92

def inspectable_content
  nil
end

#preserve_on_file_alteration? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/id3tag/frames/v2/basic_frame.rb', line 52

def preserve_on_file_alteration?
  frame_flags.preserve_on_file_alteration?
end

#preserve_on_tag_alteration? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/id3tag/frames/v2/basic_frame.rb', line 56

def preserve_on_tag_alteration?
  frame_flags.preserve_on_tag_alteration?
end

#read_additional_info_byte(position, byte_count) ⇒ Object 



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# File 'lib/id3tag/frames/v2/basic_frame.rb', line 35

def read_additional_info_byte(position, byte_count)
  if position && byte_count
    raw_content_io.seek(position)
    raw_content_io.read(byte_count).unpack("C").first
  end
end

#read_only? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/id3tag/frames/v2/basic_frame.rb', line 60

def read_only?
  frame_flags.read_only?
end

#unsynchronised? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/id3tag/frames/v2/basic_frame.rb', line 76

def unsynchronised?
  frame_flags.unsynchronised?
end

#usable_content ⇒ Object 



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# File 'lib/id3tag/frames/v2/basic_frame.rb', line 18

def usable_content
  raw_content_io.seek(additional_info_byte_count)
  if unsynchronised?
    StringUtil.undo_unsynchronization(raw_content_io.read)
  else
    raw_content_io.read
  end
end