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エントロピー符号

Last updated at Posted at 2013-10-15
hena8pre.rb
#!/usr/bin/env ruby
#http://qiita.com/Nabetani/items/24b9be4ee3bae4c89a95
#http://nabetani.sakura.ne.jp/hena/ord8entco/
T={
    '000'=>'t',
    '0010'=>'s',
    '0011'=>'n',
    '0100'=>'i',
    '01010'=>'d',
    '0101101'=>'c',
    '010111'=>'l',
    '0110'=>'o',
    '0111'=>'a',
    '10'=>'e',
    '1100'=>'r',
    '1101'=>'h',
    '111'=>:eof,
}

STDOUT.sync=true
def solve(l)
    idx=0
    r=''
    loop{
        s=T.keys.find{|e|l[idx..-1].start_with?(e)}
        return '*invalid*' if !s
        idx+=s.size
        break if T[s]==:eof
        r+=T[s]
    }
    r+':'+idx.to_s
end
while gets
    puts solve($_.chomp.chars.map{|e|('%04b'%e.to_i(16)).reverse}*'')
end
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