73 lines
1.3 KiB
Ruby
73 lines
1.3 KiB
Ruby
# -*- coding: binary -*-
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# Rex::Struct2
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module Rex
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module Struct2
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class SString
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require 'rex/struct2/element'
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require 'rex/struct2/constant'
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include Rex::Struct2::Element
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attr_reader :size, :default, :pad
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attr_writer :default, :pad
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def initialize(size=nil, default=nil, pad=nil)
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self.size = size
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@default = default
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@pad = pad
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reset()
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end
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def size=(newsize)
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if !newsize
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self.restraint = nil
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else
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res = Rex::Struct2::Constant.new(newsize)
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self.restraint = Rex::Struct2::Restraint.new(res, res, false)
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end
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end
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def reset
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self.value = @default
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end
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def to_s
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string = self.value
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return if !string
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# pad if short
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if restraint && restraint.min && self.pad && restraint.min > string.length
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string += self.pad * (restraint.min - string.length)
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end
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# truncate if long
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if restraint && restraint.max
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string = string.slice(0, restraint.max)
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end
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return string
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end
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def from_s(bytes)
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# we don't have enough bytes to satisfy our minimum
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if restraint && restraint.min && bytes.length < restraint.min
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return
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end
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if restraint && restraint.max
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self.value = bytes.slice(0, restraint.max)
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else
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self.value = bytes.dup
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end
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return(self.slength)
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end
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end
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# end Rex::Struct2
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end
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end
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