Hello! I need a function to decode/encode to Base64, can you make a Base64 to utf8 in roblox?
2 Likes
I modified this library to work with roblox:
local base64 = {}
local extract = bit32.extract
function base64.makeencoder( s62, s63, spad )
local encoder = {}
for b64code, char in pairs{[0]='A','B','C','D','E','F','G','H','I','J',
'K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y',
'Z','a','b','c','d','e','f','g','h','i','j','k','l','m','n',
'o','p','q','r','s','t','u','v','w','x','y','z','0','1','2',
'3','4','5','6','7','8','9',s62 or '+',s63 or'/',spad or'='} do
encoder[b64code] = char:byte()
end
return encoder
end
function base64.makedecoder( s62, s63, spad )
local decoder = {}
for b64code, charcode in pairs( base64.makeencoder( s62, s63, spad )) do
decoder[charcode] = b64code
end
return decoder
end
local DEFAULT_ENCODER = base64.makeencoder()
local DEFAULT_DECODER = base64.makedecoder()
local char, concat = string.char, table.concat
function base64.encode( str, encoder, usecaching )
encoder = encoder or DEFAULT_ENCODER
local t, k, n = {}, 1, #str
local lastn = n % 3
local cache = {}
for i = 1, n-lastn, 3 do
local a, b, c = str:byte( i, i+2 )
local v = a*0x10000 + b*0x100 + c
local s
if usecaching then
s = cache[v]
if not s then
s = char(encoder[extract(v,18,6)], encoder[extract(v,12,6)], encoder[extract(v,6,6)], encoder[extract(v,0,6)])
cache[v] = s
end
else
s = char(encoder[extract(v,18,6)], encoder[extract(v,12,6)], encoder[extract(v,6,6)], encoder[extract(v,0,6)])
end
t[k] = s
k = k + 1
end
if lastn == 2 then
local a, b = str:byte( n-1, n )
local v = a*0x10000 + b*0x100
t[k] = char(encoder[extract(v,18,6)], encoder[extract(v,12,6)], encoder[extract(v,6,6)], encoder[64])
elseif lastn == 1 then
local v = str:byte( n )*0x10000
t[k] = char(encoder[extract(v,18,6)], encoder[extract(v,12,6)], encoder[64], encoder[64])
end
return concat( t )
end
function base64.decode( b64, decoder, usecaching )
decoder = decoder or DEFAULT_DECODER
local pattern = '[^%w%+%/%=]'
if decoder then
local s62, s63
for charcode, b64code in pairs( decoder ) do
if b64code == 62 then s62 = charcode
elseif b64code == 63 then s63 = charcode
end
end
pattern = ('[^%%w%%%s%%%s%%=]'):format( char(s62), char(s63) )
end
b64 = b64:gsub( pattern, '' )
local cache = usecaching and {}
local t, k = {}, 1
local n = #b64
local padding = b64:sub(-2) == '==' and 2 or b64:sub(-1) == '=' and 1 or 0
for i = 1, padding > 0 and n-4 or n, 4 do
local a, b, c, d = b64:byte( i, i+3 )
local s
if usecaching then
local v0 = a*0x1000000 + b*0x10000 + c*0x100 + d
s = cache[v0]
if not s then
local v = decoder[a]*0x40000 + decoder[b]*0x1000 + decoder[c]*0x40 + decoder[d]
s = char( extract(v,16,8), extract(v,8,8), extract(v,0,8))
cache[v0] = s
end
else
local v = decoder[a]*0x40000 + decoder[b]*0x1000 + decoder[c]*0x40 + decoder[d]
s = char( extract(v,16,8), extract(v,8,8), extract(v,0,8))
end
t[k] = s
k = k + 1
end
if padding == 1 then
local a, b, c = b64:byte( n-3, n-1 )
local v = decoder[a]*0x40000 + decoder[b]*0x1000 + decoder[c]*0x40
t[k] = char( extract(v,16,8), extract(v,8,8))
elseif padding == 2 then
local a, b = b64:byte( n-3, n-2 )
local v = decoder[a]*0x40000 + decoder[b]*0x1000
t[k] = char( extract(v,16,8))
end
return concat( t )
end
return base64
--[[
ALTERNATIVE A - MIT License
Copyright (c) 2018 Ilya Kolbin
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
]]
Put this in a module script and require it then you can use the encode and decode functions
4 Likes
Thank you so much, really helped me out!!!