Class: BitStruct::TextField
Overview
Class for null-terminated printable text strings. Declared with BitStruct.text.
Instance Attribute Summary
Attributes inherited from Field
#default, #display_name, #format, #length, #name, #offset, #options
Class Method Summary collapse
-
.class_name ⇒ Object
Used in describe.
Instance Method Summary collapse
Methods inherited from Field
#class_name, default, #describe, #initialize, #inspect_in_object, #inspectable?
Constructor Details
This class inherits a constructor from BitStruct::Field
Class Method Details
.class_name ⇒ Object
Used in describe.
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# File 'lib/bit-struct/text-field.rb', line 6 def self.class_name @class_name ||= "text" end |
Instance Method Details
#add_accessors_to(cl, attr = name) ⇒ Object
:nodoc:
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# File 'lib/bit-struct/text-field.rb', line 10 def add_accessors_to(cl, attr = name) # :nodoc: unless offset % 8 == 0 raise ArgumentError, "Bad offset, #{offset}, for #{self.class} #{name}." + " Must be multiple of 8." end unless length % 8 == 0 raise ArgumentError, "Bad length, #{length}, for #{self.class} #{name}." + " Must be multiple of 8." end offset_byte = offset / 8 length_byte = length / 8 last_byte = offset_byte + length_byte - 1 byte_range = offset_byte..last_byte val_byte_range = 0..length_byte-1 cl.class_eval do define_method attr do || self[byte_range].sub(/\0*$/, "").to_s end define_method "#{attr}=" do |val| val = val.to_s if val.length < length_byte val += "\0" * (length_byte - val.length) end self[byte_range] = val[val_byte_range] end end end |