BASE64 encoding implemented by LUA

ZZBase64 = {} local string = string Zzbase64.__code = {' 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 ', ' + ', '/',}; Zzbase64.__decode = {} for k,v in pairs (zzbase64.__code) do Zzbase64.__decode[string.byte (v,1)] = K-1 End Function
    Zzbase64.encode (text) Local len = String.len (text) local left = len% 3 len = Len-left local res = {} Local index = 1 for i = 1, len, 3 do local A = String.byte (text, i) Local B = string.byte (text, I + 1) Local c = string.byte (text, i + 2)--num = a<<16 + b<<8 + c Local num = a * 6553 6 + b * + + c for j = 1, 4 do--tmp = num >> ((4-J) * 6) Local TMP = Math.floor (num/(2 ^ ((4-j) * 6))--curpos = tmp&0x3f Loc Al CurPos = tmp% + 1 Res[index] = Zzbase64.__code[curpos] Index = index + 1 end en D if left = = 1 then zzbase64.__left1 (res, index, text, len) ElseIf left = 2 then Zzbase64.__left 2 (res, index, text, len) end return Table.concat (res) End Function zzbase64.__left2 (res, index, text, Len  ) Local NUM1 = String.byte (text, Len + 1) num1 = NUM1 * 1024x768--lshift local num2 = String.byte (text, Len +
    2) num2 = num2 * 4--lshift 2 Local num = num1 + num2 Local TMP1 = Math.floor (num/4096)--rshift 12 Local CurPos = tmp1% + 1 Res[index] = zzbase64.__code[curpos] Local TMP2 = Math.floor (NUM/64) cur Pos = tmp2% + 1 Res[index + 1] = Zzbase64.__code[curpos] CurPos = num% + 1 Res[index + 2] = ZZBase64.
    
    __code[curpos]Res[index + 3] = "=" End Function zzbase64.__left1 (res, index,text, len) Local num = String.byte (text, Len + 1) num = num * tmp = Math.floor (num/64) local CurPos = tmp% + 1 Res[index] = Zzbase64.__code[curp OS] CurPos = num% + 1 Res[index + 1] = Zzbase64.__code[curpos] Res[index + 2] = "=" Res[ind Ex + 3] = "=" End Function Zzbase64.decode (text) Local len = String.len (text) Local left = 0 if string.sub ( Text, len-1) = = "= =" then left = 2 len = len-4 ElseIf string.sub (text, len) = = "=" Then L  EFT = 1 len = len-4 End Local res = {} Local index = 1 Local decode = Zzbase64.__decode for 
        I =1, Len, 4 do local A = Decode[string.byte (text,i)] Local B = decode[string.byte (Text,i + 1)] Local C = decode[string.byte (Text,i + 2)] Local d = decode[string.byte (Text,i + 3)]--num = A&LT;&L t;18 + b<<12 + C&Lt;<6 + d Local num = a * 262144 + b * 4096 + c * + D local e = String.char (num% 256) num = Math.floor (num/256) Local f = string.char (num%) num = Math.floor (num/256) res[in

    DEX] = String.char (num%) Res[index + 1] = f Res[index + 2] = e index = index + 3 end If left = = 1 then zzbase64.__decodeleft1 (res, index, text, len) ElseIf left = 2 then Zzbase64.__dec ODELEFT2 (res, index, text, len) end return Table.concat (res) End Function Zzbase64.__decodeleft1 (res, index, text , len) Local decode = Zzbase64.__decode local A = Decode[string.byte (text, Len + 1)] Local B = decode[string. Byte (text, Len + 2)] Local c = decode[string.byte (text, Len + 3)] Local num = a * 4096 + b * + C LOC Al Num1 = Math.floor (num/1024)% Local num2 = Math.floor (NUM/4)% res[index] = String.char (NUM1) r Es[index + 1] = string.cHar (num2) End Function zzbase64.__decodeleft2 (res, index, text, len) Local decode = Zzbase64.__decode local A = d Ecode[string.byte (text, Len + 1)] Local B = decode[string.byte (text, Len + 2)] Local num = a * + b num = m Ath.floor (NUM/16) Res[index] = String.char (num) End Function zzbase64.test () Local data = "a\193\207=" Loca
    L ABC = zzbase64.encode (data) print (ABC) def = Zzbase64.decode (ABC) If DEF = = Data then print ("Yes")
 End End Zzbase64.test ()