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local String = string
local Bit = include("bit.lua");
local Array = include("array.lua");
local Stream = include("stream.lua");
local AND = Bit.band;
local OR = Bit.bor;
local NOT = Bit.bnot;
local XOR = Bit.bxor;
local LROT = Bit.lrotate;
local RROT = Bit.rrotate;
local LSHIFT = Bit.lshift;
local RSHIFT = Bit.rshift;
local SYMBOLS = {
[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","+","/"};
local LOOKUP = {};
for k,v in pairs(SYMBOLS) do
LOOKUP[k]=v;
LOOKUP[v]=k;
end
local Base64 = {};
Base64.fromStream = function(stream)
local bits = 0x00;
local bitCount = 0;
local base64 = {};
local byte = stream();
while byte ~= nil do
bits = OR(LSHIFT(bits,8),byte);
bitCount = bitCount + 8;
while bitCount >= 6 do
bitCount = bitCount - 6;
local temp = RSHIFT(bits,bitCount);
table.insert(base64,LOOKUP[temp]);
bits = AND(bits,NOT(LSHIFT(0xFFFFFFFF,bitCount)));
end
byte = stream();
end
if (bitCount == 4) then
bits = LSHIFT(bits,2);
table.insert(base64,LOOKUP[bits]);
table.insert(base64,"=");
elseif (bitCount == 2) then
bits = LSHIFT(bits,4);
table.insert(base64,LOOKUP[bits]);
table.insert(base64,"==");
end
return table.concat(base64,"");
end
Base64.fromArray = function(array)
local bits = 0x00;
local bitCount = 0;
local base64 = {};
local ind = 1;
local byte = array[ind]; ind = ind + 1;
while byte ~= nil do
bits = OR(LSHIFT(bits,8),byte);
bitCount = bitCount + 8;
while bitCount >= 6 do
bitCount = bitCount - 6;
local temp = RSHIFT(bits,bitCount);
table.insert(base64,LOOKUP[temp]);
bits = AND(bits,NOT(LSHIFT(0xFFFFFFFF,bitCount)));
end
byte = array[ind]; ind = ind + 1;
end
if (bitCount == 4) then
bits = LSHIFT(bits,2);
table.insert(base64,LOOKUP[bits]);
table.insert(base64,"=");
elseif (bitCount == 2) then
bits = LSHIFT(bits,4);
table.insert(base64,LOOKUP[bits]);
table.insert(base64,"==");
end
return table.concat(base64,"");
end
Base64.fromString = function(string)
return Base64.fromArray(Array.fromString(string));
end
Base64.toStream = function(base64)
return Stream.fromArray(Base64.toArray(base64));
end
Base64.toArray = function(base64)
local bits = 0x00;
local bitCount = 0;
local bytes = {};
for c in String.gmatch(base64,".") do
if (c == "=") then
bits = RSHIFT(bits,2); bitCount = bitCount - 2;
else
bits = LSHIFT(bits,6); bitCount = bitCount + 6;
bits = OR(bits,LOOKUP[c]);
end
while(bitCount >= 8) do
bitCount = bitCount - 8;
local temp = RSHIFT(bits,bitCount);
table.insert(bytes,temp);
bits = AND(bits,NOT(LSHIFT(0xFFFFFFFF,bitCount)));
end
end
return bytes;
end
Base64.toString = function(base64)
local bits = 0x00;
local bitCount = 0;
local chars = {};
for c in String.gmatch(base64,".") do
if (c == "=") then
bits = RSHIFT(bits,2); bitCount = bitCount - 2;
else
bits = LSHIFT(bits,6); bitCount = bitCount + 6;
bits = OR(bits,LOOKUP[c]);
end
while(bitCount >= 8) do
bitCount = bitCount - 8;
local temp = RSHIFT(bits,bitCount);
table.insert(chars,String.char(temp));
bits = AND(bits,NOT(LSHIFT(0xFFFFFFFF,bitCount)));
end
end
return table.concat(chars,"");
end
return Base64;
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