46 lines
1.1 KiB
Ruby
46 lines
1.1 KiB
Ruby
require 'stringio'
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module Net::BER::Extensions::String
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##
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# Converts a string to a BER string. Universal octet-strings are tagged
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# with 0x04, but other values are possible depending on the context, so we
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# let the caller give us one.
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#
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# User code should call either #to_ber_application_string or
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# #to_ber_contextspecific.
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def to_ber(code = 0x04)
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[code].pack('C') + length.to_ber_length_encoding + self
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end
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##
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# Creates an application-specific BER string encoded value with the
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# provided syntax code value.
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def to_ber_application_string(code)
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to_ber(0x40 + code)
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end
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##
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# Creates a context-specific BER string encoded value with the provided
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# syntax code value.
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def to_ber_contextspecific(code)
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to_ber(0x80 + code)
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end
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##
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# Nondestructively reads a BER object from this string.
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def read_ber(syntax = nil)
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StringIO.new(self).read_ber(syntax)
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end
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##
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# Destructively reads a BER object from the string.
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def read_ber!(syntax = nil)
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io = StringIO.new(self)
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result = io.read_ber(syntax)
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self.slice!(0...io.pos)
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return result
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end
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end
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