sendFile.lua

------ способ кодировки символов base64 числами от 1 до 64 ------
function fromNumbers(numbers, alphabet)
    local s = ""
    for i = 1, #numbers do
        s = s..string.sub(alphabet, numbers[i], numbers[i])
    end
    return s
end

function toNumbers(str, alphabet)
    local nums = {}
    local char
    for i = 1, #str do
        char = string.sub(str, i, i)
        nums[i] = string.find(alphabet, char)
    end
    return nums
end

function sendBigStr(str, msgSize)
    print("Передача файла ".. fileName .." по сети...\n\n")

    local ender_net = require("ender-net")
    local msgSize = ender_net.maxMessageSize

    local i, buf, percentile = 0, ""
    local dataSize, sendedDataSize = #str, 0
    ender_net.sendMessage(1, dataSize)
    while true do
        buf = string.sub(str, i + 1, i + msgSize)
        if #buf == 0 then break end
        ender_net.sendMessage(2, toNumbers(buf, base64.chars), 0.05)
        i = i + msgSize

        sendedDataSize = sendedDataSize + #buf
        percentile = math.floor(sendedDataSize / dataSize * 100)
        print(percentile .. "%")
    end
    ender_net.sendMessage(3, {}, 0.3)
end

---------------------------------------------------------
fileName = ...
file = require("filesystem").open(..., "r")
if file == nil then error("Файл не существует") end
base64 = require("ender-net-base64")

-- Читаем содержимое файла в переменную fileContent
local fileContent, buf='',''
while buf do
  buf = file.read(file, math.huge)
  fileContent = fileContent..(buf or "")
end

fileContent = base64.encode(fileContent)


sendBigStr(fileContent)