37 lines
1.1 KiB
Ruby
37 lines
1.1 KiB
Ruby
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require 'bit-struct/char-field'
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class BitStruct
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# Class for char fields that can be accessed with values like
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# "xx:xx:xx:xx", where each xx is up to 2 hex digits representing a
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# single octet. The original string-based accessors are still available with
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# the <tt>_chars</tt> suffix.
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#
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# Declared with BitStruct.hex_octets.
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class HexOctetField < BitStruct::OctetField
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# Used in describe.
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def self.class_name
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@class_name ||= "hex_octets"
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end
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SEPARATOR = ":"
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FORMAT = "%02x"
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BASE = 16
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end
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class << self
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# Define an octet string field in the current subclass of BitStruct,
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# with the given _name_ and _length_ (in bits). Trailing nulls are
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# not considered part of the string. The field is accessed using
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# period-separated hex digits.
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#
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# If a class is provided, use it for the Field class.
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# If a string is provided, use it for the display_name.
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# If a hash is provided, use it for options.
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#
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def hex_octets(name, length, *rest)
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opts = parse_options(rest, name, HexOctetField)
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add_field(name, length, opts)
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end
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end
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end
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