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EncoderLibrary.lua

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local error = error

local ipairs = ipairs

local string = string

local table = table

local unpack = unpack

local print = print

local bit = bit or bit32

if bit == nil then

bit = {}

local MOD = 2 ^ 32

local MODM = MOD - 1

function bit.bxor(a, b)

local p, c = 1, 0

while a > 0 and b > 0 do

local ra, rb = a % 2, b % 2

if ra ~= rb then

c = c + p

end

a, b, p = (a - ra) / 2, (b - rb) / 2, p * 2

end

if a < b then

a = b

end

while a > 0 do

local ra = a % 2

if ra > 0 then

c = c + p

end

a, p = (a - ra) / 2, p * 2

end

return c

end

function bit.band(a, b)

return (a + b - bit.bxor(a, b)) / 2

end

function bit.bor(a, b)

return MODM - bit.band((MODM - a), (MODM - b))

end

function bit.lshift(a, disp)

if disp < 0 then

return bit.rshift(a, -disp)

end

return a * 2 ^ disp % 2 ^ 32

end

function bit.rshift(a, disp)

if disp < 0 then

return bit.lshift(a, -disp)

end

return math.floor(a % 2 ^ 32 / 2 ^ disp)

end

local utf8 = utf8

if utf8 == nil then

utf8 = {}

utf8.char = function(...)

local buf = {}

for k, v in ipairs({

...,

}) do

if v < 0 or v > 1114111 then

error("bad argument #" .. k .. " to char (out of range)", 2)

end

local b1, b2, b3, b4 = nil, nil, nil, nil

if v < 128 then

table.insert(buf, string.char(v))

elseif v < 2048 then

b1 = bit.bor(192, bit.band(bit.rshift(v, 6), 31))

b2 = bit.bor(128, bit.band(v, 63))

table.insert(buf, string.char(b1, b2))

elseif v < 65536 then

b1 = bit.bor(224, bit.band(bit.rshift(v, 12), 15))

b2 = bit.bor(128, bit.band(bit.rshift(v, 6), 63))

b3 = bit.bor(128, bit.band(v, 63))

table.insert(buf, string.char(b1, b2, b3))

else

b1 = bit.bor(240, bit.band(bit.rshift(v, 18), 7))

b2 = bit.bor(128, bit.band(bit.rshift(v, 12), 63))

b3 = bit.bor(128, bit.band(bit.rshift(v, 6), 63))

b4 = bit.bor(128, bit.band(v, 63))

table.insert(buf, string.char(b1, b2, b3, b4))

end

return table.concat(buf, "")

end

local helpers = {}

function helpers.StringToBytes(str)

local bytes = {

str:byte(1, -1),

}

for i = 1, #bytes do

bytes[i] = bytes[i] + 12

end

return table.concat(bytes, "'")

end

function helpers.StringSplit(str)

local t = {}

str:gsub(".", function(b)

t[#t + 1] = b

end)

return t

end

function helpers.SplitBytes(str)

local index = 0

local t = {}

str = str:gsub("255'172", "")

local assembled = ""

for chunk in string.gmatch(str, "([^']+)") do

if index == 1 then

index = 0

assembled = assembled .. "'" .. chunk

table.insert(t, assembled)

else

assembled = chunk

index = index + 1

end

return t

end

function helpers.ToBytes(str)

return str:gsub(".", function(b)

return "\\" .. b:byte()

end)

end

function helpers.ToString(bytes)

return (bytes

:gsub("\\(%d+)", function(b)

return b:char()

end)

:gsub("\\", ""))

end

local ascp_characters = {

"\\",

"0",

"1",

"2",

"3",

"4",

"5",

"6",

"7",

"8",

"9",

}

local replace_characters = {

917536,

917537,

917538,

917539,

917540,

917541,

917542,

917543,

917544,

917545,

917546,

}

local characters = {

characters = {},

reverse = {},

}

for i, v in ipairs(ascp_characters) do

characters.characters[v] = replace_characters[i]

local corresponding = (helpers.StringToBytes(utf8.char(replace_characters[i])):gsub("255'172'", ""))

characters.reverse[corresponding] = v

end

local library = {}

function library.encode(str)

str = helpers.ToBytes(str)

local encoded = {}

for i, v in ipairs(helpers.StringSplit(str)) do

encoded[i] = utf8.char(characters.characters[v])

end

return table.concat(encoded, "")

end

function library.decode(str)

local decoded = {}

local bytes = helpers.SplitBytes(helpers.StringToBytes(str))

for i, v in ipairs(bytes) do

decoded[i] = characters.reverse[v]

end

return helpers.ToString(table.concat(decoded, ""))

end

library.helpers = helpers

return library