Bittorrent的编码模块的ruby代码
最近看了看bt的源码，随手写了些ruby的代码：def encode(x)case x.class.to_swhen "Float" encode_num(x)when "Fixnum" encode_num(x)when "Bignum" encode_num(x)when "String" encode_string(x)when "Array" encode_list(x)when "Hash" encode_hash(x)else "unknown" endenddef encode_num(x)"i#{x.to_s}e"enddef encode_string(x)"#{x.size}:#{x}"enddef encode_list(x)str="l"x.each do |temp| str+=encode(temp)endstr+="e"enddef encode_hash(x)str="d"x.each do |key,val| str+=encode(key) str+=encode(val) endstr+="e"endputs encode("abcd") # returns "4:abcd"puts encode(1000) # returns "i1000e"puts encode() # returns "li1ei2ei3ee"puts encode({"key" => "value"}) # returns "d3:key5:valuee"
def decode(io)c = io.getccase c.chrwhen 'i' i = '' while c = io.getc if c.chr == 'e' if i.match(/^(0|-?*)$/) return i.to_i end else i += c.chr end endwhen '0'..'9' n = c.chr while b = io.getc case b.chr when '0'..'9' n += b.chr when ':' strlen = n.to_i str = io.read(strlen) if str.length == strlen return str end end endwhen 'l' list = [] while item = decode(io) list.push(item) end return listwhen 'd' dict = {} while key = decode(io) val = decode(io) dict = val end return dictwhen 'e' return falseendendputs decode(StringIO.new("4:abcd"))puts decode(StringIO.new("i1000e"))puts decode(StringIO.new("li1ei2ei3ee"))puts decode(StringIO.new("d3:key5:valuee"))
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