5 lines
2.5 KiB
Lua
5 lines
2.5 KiB
Lua
-- base64 1.5.3 | /base64.lua | https://github.com/iskolbin/lbase64 | License: Unlicense | Minified using https://www.npmjs.com/package/luamin/v/1.0.4
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local a={}local b=_G.bit32 and _G.bit32.extract;if not b then if _G.bit then local c,d,e=_G.bit.lshift,_G.bit.rshift,_G.bit.band;b=function(f,g,h)return e(d(f,g),c(1,h)-1)end elseif _G._VERSION=="Lua 5.1"then b=function(f,g,h)local i=0;local j=2^g;for k=0,h-1 do local l=j+j;if f%l>=j then i=i+2^k end;j=l end;return i end else b=load[[return function( v, from, width )
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return ( v >> from ) & ((1 << width) - 1)
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end]]()end end;function a.makeencoder(m,n,o)local p={}for q,r 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',m or'+',n or'/',o or'='}do p[q]=r:byte()end;return p end;function a.makedecoder(m,n,o)local s={}for q,t in pairs(a.makeencoder(m,n,o))do s[t]=q end;return s end;local u=a.makeencoder()local v=a.makedecoder()local r,w=string.char,table.concat;function a.encode(x,p,y)p=p or u;local z,A,B={},1,#x;local C=B%3;local D={}for k=1,B-C,3 do local E,F,G=x:byte(k,k+2)local f=E*0x10000+F*0x100+G;local H;if y then H=D[f]if not H then H=r(p[b(f,18,6)],p[b(f,12,6)],p[b(f,6,6)],p[b(f,0,6)])D[f]=H end else H=r(p[b(f,18,6)],p[b(f,12,6)],p[b(f,6,6)],p[b(f,0,6)])end;z[A]=H;A=A+1 end;if C==2 then local E,F=x:byte(B-1,B)local f=E*0x10000+F*0x100;z[A]=r(p[b(f,18,6)],p[b(f,12,6)],p[b(f,6,6)],p[64])elseif C==1 then local f=x:byte(B)*0x10000;z[A]=r(p[b(f,18,6)],p[b(f,12,6)],p[64],p[64])end;return w(z)end;function a.decode(I,s,y)s=s or v;local J='[^%w%+%/%=]'if s then local m,n;for t,q in pairs(s)do if q==62 then m=t elseif q==63 then n=t end end;J=('[^%%w%%%s%%%s%%=]'):format(r(m),r(n))end;I=I:gsub(J,'')local D=y and{}local z,A={},1;local B=#I;local K=I:sub(-2)=='=='and 2 or I:sub(-1)=='='and 1 or 0;for k=1,K>0 and B-4 or B,4 do local E,F,G,L=I:byte(k,k+3)local H;if y then local M=E*0x1000000+F*0x10000+G*0x100+L;H=D[M]if not H then local f=s[E]*0x40000+s[F]*0x1000+s[G]*0x40+s[L]H=r(b(f,16,8),b(f,8,8),b(f,0,8))D[M]=H end else local f=s[E]*0x40000+s[F]*0x1000+s[G]*0x40+s[L]H=r(b(f,16,8),b(f,8,8),b(f,0,8))end;z[A]=H;A=A+1 end;if K==1 then local E,F,G=I:byte(B-3,B-1)local f=s[E]*0x40000+s[F]*0x1000+s[G]*0x40;z[A]=r(b(f,16,8),b(f,8,8))elseif K==2 then local E,F=I:byte(B-3,B-2)local f=s[E]*0x40000+s[F]*0x1000;z[A]=r(b(f,16,8))end;return w(z)end;return a
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