Class: DBF::Header

Inherits:
Object
  • Object
show all
Defined in:
lib/dbf/header.rb

Constant Summary collapse

HEADER_SIZE = 
32

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data) ⇒ Header

Returns a new instance of Header.



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# File 'lib/dbf/header.rb', line 9

def initialize(data)
  # Pad a nil or truncated header read so unpacking a short file yields
  # empty values instead of raising.
  data = data.to_s.b.ljust(HEADER_SIZE, "\x00")
  @version = data.unpack1('H2')
  @encoding_key = nil
  @encoding = nil

  case @version
  when '02'
    @record_count, @record_length = data.unpack('x v x3 v')
    @header_length = 521
  else
    @record_count, @header_length, @record_length, @encoding_key = data.unpack('x x3 V v2 x17 H2')
    @encoding = DBF::ENCODINGS[@encoding_key]
  end
end

Instance Attribute Details

#encoding ⇒ Object (readonly)

Returns the value of attribute encoding.



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# File 'lib/dbf/header.rb', line 7

def encoding
  @encoding
end

#encoding_key ⇒ Object (readonly)

Returns the value of attribute encoding_key.



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# File 'lib/dbf/header.rb', line 7

def encoding_key
  @encoding_key
end

#header_length ⇒ Object (readonly)

Returns the value of attribute header_length.



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# File 'lib/dbf/header.rb', line 7

def header_length
  @header_length
end

#record_count ⇒ Object (readonly)

Returns the value of attribute record_count.



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# File 'lib/dbf/header.rb', line 7

def record_count
  @record_count
end

#record_length ⇒ Object (readonly)

Returns the value of attribute record_length.



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# File 'lib/dbf/header.rb', line 7

def record_length
  @record_length
end

#version ⇒ Object (readonly)

Returns the value of attribute version.



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# File 'lib/dbf/header.rb', line 7

def version
  @version
end