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Versions: 39
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Contents
#!/usr/bin/env ruby
#--
# Copyright 2004 by Duncan Robertson (duncan@whomwah.com).
# All rights reserved.
# Permission is granted for use, copying, modification, distribution,
# and distribution of modified versions of this work as long as the
# above copyright notice is included.
#++
module RQRCode #:nodoc:
class QRMath
module_eval {
exp_table = Array.new(256)
log_table = Array.new(256)
( 0...8 ).each do |i|
exp_table[i] = 1 << i
end
( 8...256 ).each do |i|
exp_table[i] = exp_table[i - 4] \
^ exp_table[i - 5] \
^ exp_table[i - 6] \
^ exp_table[i - 8]
end
( 0...255 ).each do |i|
log_table[exp_table[i] ] = i
end
EXP_TABLE = exp_table
LOG_TABLE = log_table
}
class << self
def glog(n)
raise QRCodeRunTimeError, "glog(#{n})" if ( n < 1 )
LOG_TABLE[n]
end
def gexp(n)
while n < 0
n = n + 255
end
while n >= 256
n = n - 255
end
EXP_TABLE[n]
end
end
end
end
Version data entries
39 entries across 39 versions & 7 rubygems