Sha256: 34add2b0c9ca02bc40f005863243dc9d44c85517fb173a275942abcd855ebe9e
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Size: 1.41 KB
Versions: 7
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Contents
# coding: utf-8
# This file is part of PacketGen
# See https://github.com/sdaubert/packetgen for more informations
# Copyright (C) 2016 Sylvain Daubert <sylvain.daubert@laposte.net>
# This program is published under MIT license.
# frozen_string_literal: true
module PacketGen
module Types
# This module is a mixin adding +length_from+ capacity to a type.
# +length_from+ capacity is the capacity, for a type, to gets its
# length from another object.
# @author Sylvain Daubert
# @since 3.0.0
module LengthFrom
# Initialize +length from+ capacity.
# Should be call by extensed object's initialize.
# @param [Hash] options
# @option options [Types::Int,Proc] :length_from object or proc from which
# takes length when reading
# @return [void]
def initialize_length_from(options)
@length_from = options[:length_from]
end
# Return a substring from +str+ of length given in another object.
# @param [#to_s] str
# @return [String]
def read_with_length_from(str)
s = PacketGen.force_binary(str.to_s)
str_end = case @length_from
when Types::Int
@length_from.to_i
when Proc
@length_from.call
else
s.size
end
str_end = 0 if str_end < 0
s[0, str_end]
end
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems