Sha256: 87ba1de9d79209f397c31d8fcb3acb1a4f61ab2c1a2ee0480e9c31681c28f522
Contents?: true
Size: 1.46 KB
Versions: 21
Compression:
Stored size: 1.46 KB
Contents
# -*- coding: binary -*-
# Rex::Struct2
module Rex
module Struct2
class Generic
require 'rex/struct2/element'
include Rex::Struct2::Element
attr_reader :default
attr_writer :default
attr_accessor :mask, :check_mask
def initialize(packspec, signed=false, default=nil)
@packspec = packspec
@default = default
bytelen = [ -1 ].pack(@packspec).length
self.mask = (1 << (8 * bytelen)) - 1
if signed
self.check_mask = 1 << (8 * bytelen - 1)
else
self.check_mask = 0
end
reset()
end
def reset
self.value = @default
end
def to_s
# I realize this will bomb out if this isn't an integer, for
# example if it is nil. That should only happen for a user
# error so that's what I want it to do...
string = [ @value ].pack(@packspec)
if restraint && restraint.max
return string.slice(0, restraint.max)
else
return string
end
# what to do for restraint.min?!?
end
def from_s(bytes)
value = bytes.unpack(@packspec)[0]
# return nil on unpack error
return if !value
len = slength()
# error on any restraint issues
return if restraint && restraint.max && len > restraint.max
return if restraint && restraint.min && len < restraint.min
# else set our value and return length used for this element
if (value & check_mask) != 0
value = -((~value & mask) + 1)
end
self.value = value
return(len)
end
end
# end Rex::Struct2
end
end
Version data entries
21 entries across 21 versions & 4 rubygems