【进阶实战】Lua手写base64：祖玛教主掉落码的可读广播

local function broadcast(actor, code)
    sendmsg(actor, 1, "掉落码 " .. code)   -- 竖线引号被切碎
end

local B64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
local function b64(s)
    local out = {}
    for i = 1, #s, 3 do
        local a, b, c = string.byte(s, i, i + 2)
        local n = a * 65536 + (b or 0) * 256 + (c or 0)
        out[#out + 1] = string.sub(B64,
            math.floor(n / 262144) % 64 + 1, 1)
        out[#out + 1] = string.sub(B64,
            math.floor(n / 4096) % 64 + 1, 1)
        out[#out + 1] = b and string.sub(B64,
            math.floor(n / 64) % 64 + 1, 1) or "="
        out[#out + 1] = c and string.sub(B64, n % 64 + 1, 1) or "="
    end
    return table.concat(out)
end
sendmsg(actor, 1, "祖玛教主掉落码 " .. b64("ZJZZ|1|500"))