Class: TTFunk::SubTable

Inherits:
Object
  • Object
show all
Includes:
Reader
Defined in:
lib/ttfunk/sub_table.rb

Overview

SFNT sub-table

Defined Under Namespace

Classes: EOTError

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file, offset, length = nil) ⇒ SubTable

Returns a new instance of SubTable.

Parameters:

  • file (IO)
  • offset (Integer)
  • length (Integer) (defaults to: nil)
Source Code
lib/ttfunk/sub_table.rb, line 29
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def initialize(file, offset, length = nil)

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  @file = file

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  @table_offset = offset

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  @length = length

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  parse_from(@table_offset) { parse! }

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end

Instance Attribute Details

#file ⇒ IO (readonly)

File or IO this sub-table is in.

Returns:

  • (IO)
Source Code
lib/ttfunk/sub_table.rb, line 16
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def file

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  @file

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end

#length ⇒ Integer? (readonly)

This sub-table’s length in byes.

Returns:

  • (Integer, nil)
Source Code
lib/ttfunk/sub_table.rb, line 24
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def length

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  @length

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end

#table_offset ⇒ Integer (readonly)

This sub-table’s offset from the file beginning.

Returns:

  • (Integer)
Source Code
lib/ttfunk/sub_table.rb, line 20
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def table_offset

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  @table_offset

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end

Instance Method Details

#eot? ⇒ Boolean

End of sub-table?

Returns:

  • (Boolean)
Source Code
lib/ttfunk/sub_table.rb, line 39
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def eot?

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  # if length isn't set yet there's no way to know if we're at the end of

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  # the sub-table or not

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  return false unless length

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  io.pos > table_offset + length

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end







    
      

  

  
    #read(bytes, format)  ⇒ Array 
  

  

  


  

    
Read a series of values.



  





  

  

  

    


  





  

Parameters:


    
  
    
  • 
      
        bytes
      
      
        (Integer)
      
      
      
        —
        
    number of bytes to read.
    

    
      
    
    • 
  
    
  • 
      
        format
      
      
        (String)
      
      
      
        —
        
    format to parse the bytes.
    

    
      
    
    • 
  




Returns:


    
  
    
  • 
      
      
        (Array)
      
      
      
    
    • 
  



Raises:



  
See Also:

  
    
    
      
  • Ruby Packed data
    • 
    
  










  Source Code
  
lib/ttfunk/sub_table.rb, line 55

  
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def read(*args)

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  if eot?

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    raise EOTError, 'attempted to read past the end of the table'

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  end

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  super

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end