Class: Codec::Fix

Inherits:
Base
  • Object
show all
Defined in:
lib/codec/fix.rb

Direct Known Subclasses

Ascii, Binary, Ebcdic, Numbin, Numebc, Numstr, String

Instance Method Summary collapse

Methods inherited from Base

#add_sub_codec, #encode, #get_sub_codecs

Constructor Details

#initialize(length = nil) ⇒ Fix

Returns a new instance of Fix.



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# File 'lib/codec/fix.rb', line 4

def initialize(length=nil)
  @length = length || 0
end

Instance Method Details

#build_field(w, f, l) ⇒ Object 



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# File 'lib/codec/fix.rb', line 27

def build_field(w,f,l)
  raise "Abstract Codec : build field not defined for #{self.class.name}"
end

#check_length(buf, length) ⇒ Object 



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# File 'lib/codec/fix.rb', line 8

def check_length(buf,length)
 raise "Length is nil" if length.nil?
  if(length != 0)
   if buf.length < length
     raise BufferUnderflow, "Not enough data for decoding (#{length}/#{buf.length})"
   end
    return length
  else
    return buf.length
  end    
end

#decode(buf, field, length = nil) ⇒ Object 



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# File 'lib/codec/fix.rb', line 20

def decode(buf,field,length=nil)
  length ||= @length
  l = check_length(buf,length)
  wbuf = buf.slice!(0...l)
  build_field(wbuf,field,l)    
end