【进阶实战】Lua校验和：祖玛教主掉落码的byte求和防篡改

local function send(actor, code)
    sendmsg(actor, 1, code)          -- 裸传无校验
end

-- 祖玛教主掉落码：尾缀byte求和校验
local function sum8(s)
    local sum = 0
    for i = 1, #s do
        sum = sum + string.byte(s, i)
    end
    return sum % 256                 -- 收进一个字节
end
local function send(actor, code)
    sendmsg(actor, 1, code .. "#" .. sum8(code))
end
local function recv(actor, msg)
    local code, tag = string.match(msg, "^(.*)#(%d+)$")
    if code and tag == tostring(sum8(code)) then
        giveitem(actor, "金元", 1, 0, "掉落码核对通过")
    end
end