From 1de5f9ac6f038bfed2230cc1272b253794b2f41a Mon Sep 17 00:00:00 2001
From: Alexander Pickering <alexandermpickering@gmail.com>
Date: Sun, 10 Jul 2016 17:04:29 -0400
Subject: Initial commit

---
 gamemode/shared/lockbox/base64.lua | 157 +++++++++++++++++++++++++++++++++++++
 1 file changed, 157 insertions(+)
 create mode 100644 gamemode/shared/lockbox/base64.lua

(limited to 'gamemode/shared/lockbox/base64.lua')

diff --git a/gamemode/shared/lockbox/base64.lua b/gamemode/shared/lockbox/base64.lua
new file mode 100644
index 0000000..3d9ffc3
--- /dev/null
+++ b/gamemode/shared/lockbox/base64.lua
@@ -0,0 +1,157 @@
+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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