nginx lua模块下的 id转特殊路径

gistfile1.lua

function id2path(IN)
  local B,K,OUT,I,D=16,"0123456789ABCDEF","",0
    local now = 0
    local len = 0
    while IN>0 do
        if len > 0 and math.mod(len,2) == 0 then
            OUT="/"..OUT
        end
        I=I+1
        IN,D=math.floor(IN/B),math.mod(IN,B)+1
        OUT=string.sub(K,D,D)..OUT
        len = len + 1
        --print(OUT.."  "..now..len)
    end
    while len < 14 do
        if len > 0 and math.mod(len,2) == 0 then
            OUT="/"..OUT
        end
        OUT="0"..OUT
        len = len + 1
    end
    return "/"..OUT
end