【网络通信】压缩传输：长文本公告的压缩下发

-- 公告压缩：服务端编码
local player = class(actor)
local function compressAnnounce(player, text)
    local dict = {}
    local dictList = {}
    local compressed = text
    for _, phrase in ipairs({"行会", "活动", "奖励", "玩家", "沙巴克"}) do
        if string.find(compressed, phrase, 1, true) then
            dict[#dictList + 1] = phrase
            dictList[#dictList + 1] = phrase
            compressed = string.gsub(compressed, phrase, "\1" .. #dictList .. "\1")
        end
    end
    sendluamsg(player, 9997, #compressed, #dictList, 0, compressed)
    return dictList
end

-- 公告解压：客户端还原
local player = class(actor)
local function onAnnounce(player2, msgId, w1, w2, w3, sMsg)
    local dict = {}
    for i = 1, w2 do
        dict[tostring(i)] = "词条" .. i
    end
    local restored = string.gsub(sMsg, "\1(%d+)\1", function(n)
        return dict[n] or "?"
    end)
    if #restored ~= w1 * 4 then
        SL:ShowSystemTips("公告数据异常，正在重新获取")
        return
    end
    SL:ShowSystemTips("公告已加载，长度 " .. #restored)
end
SL:RegisterLuaNetMsg(9998, onAnnounce, nil)