Working with bits and bytes

[Jules Graus]

Hello people,

I need to do binary operations. at least be able to add and subtract binairy numbers from eachother. And if possible i want to convert between binary and decimal. Does lua have some functions to do this?

I want to create a IPv4 Subnetting and VLSM CIDR tool.

Thanks in advance

[Ulrich]

This may possibly help.

Ulrich

[Jules Graus]

Thank you.

Thank you that solves multiplication at least.

I've made a couple of functions already. They convert between decimal and binary and vice versa.
Now i need to solve the addition and subtraction of binary numbers. Shouldnt take to long . And i also need to improve the ToBinary function a bit.

function ToBinary(decimal, byte_separating_dots) --decimal to 32 bits
	decimal = String.ToNumber(""..decimal.."")
	local decimal_working = decimal 
	local binary = ""
	local try = ""

	local curr_bit = 32
	
	while curr_bit > 0 do
		if byte_separating_dots == true then
			if curr_bit == 24 or curr_bit == 16 or curr_bit == 8 then
				binary = binary.."."
			end
		end
	
		
		try = Math.Pow(2, curr_bit-1)
		if (decimal_working - try) >= 0 then
			decimal_working = decimal_working - try
			binary = binary.."1"
		else
			binary = binary.."0"
		end
		
		curr_bit = curr_bit - 1	
	end
	
	return binary
end

function ToDecimal(binary) --binary (max 32 bits) naar decimaal
	binary = String.Replace(binary, ".", "", false)
	
	local length = String.Length(binary)
	if length > 32 then
		Dialog.Message("Error", "The number should not exceed 32 bits.", MB_OK, MB_ICONNONE, MB_DEFBUTTON1)
	else
		local decimal = 0
		local add = 0
		
		for x = length, 1, -1 do
			char = String.Mid(""..String.Reverse(binary).."", x, 1)
			
			if char == "1" then
				add = Math.Pow(2, x-1)
			elseif char == "0" then
				add = 0
			end
			
			decimal = decimal + add
		end
		
		return decimal
	end
end

function String.Reverse(data)
	local Length = String.Length(data)
	local result = ""
	local char = ""
	
	for x = Length, 1, -1 do
		char = String.Mid(data, x, 1)
		result = result..char
	end
	
	return result
end

[Jules Graus]

Done

Made the following functions:
ToBinary(decimal, byte_separating_dots)
ToDecimal(binary)
BinDecOperation(numberone, typeone, numbertwo, typetwo, operator, resulttype, binary_dots)
String.Reverse(data)

function ToBinary(decimal, byte_separating_dots) --decimal to 32 bits
	decimal = String.ToNumber(""..decimal.."")
	if decimal > 4294967295 then
		Dialog.Message("Error", "The number may not be bigger then 4294967295.", MB_OK, MB_ICONNONE, MB_DEFBUTTON1)
	else
		local decimal_working = decimal 
		local binary = ""
		local try = ""

		local curr_bit = 32
		
		while curr_bit > 0 do
			if byte_separating_dots == true then
				if curr_bit == 24 or curr_bit == 16 or curr_bit == 8 then
					binary = binary.."."
				end
			end
		
			
			try = Math.Pow(2, curr_bit-1)
			if (decimal_working - try) >= 0 then
				decimal_working = decimal_working - try
				binary = binary.."1"
			else
				binary = binary.."0"
			end
			
			curr_bit = curr_bit - 1	
		end
		
		return binary
	end
end

function ToDecimal(binary) --binary (max 32 bits) to decimal
	binary = String.Replace(binary, ".", "", false)
	
	local length = String.Length(binary)
	if length > 32 then
		Dialog.Message("Fout", "The number may, but not exceed 32 bits.", MB_OK, MB_ICONNONE, MB_DEFBUTTON1)
	else
		local decimal = 0
		local add = 0
		
		for x = length, 1, -1 do
			char = String.Mid(""..String.Reverse(binary).."", x, 1)
			
			if char == "1" then
				add = Math.Pow(2, x-1)
			elseif char == "0" then
				add = 0
			end
			
			decimal = decimal + add
		end
		
		return decimal
	end
end

function BinDecOperation(numberone, typeone, numbertwo, typetwo, operator, resulttype, binary_dots) --Does an operation on binary and decimal numbers. Example: result = BinDecOperation("12", "Decimal", "1010", "+", "Decimaal", false). Adds 1010 (decimal 10) to decimal number 12. Decimal result: 22. If you add an optional boolean you can specify whether you want (true) or dont want (false) to add dots every 8 bits.
	if operator == "+" or operator == "-" or operator == "/" or operator == "*" or operator == "%" or operator == "^" then
		if typeone == "Decimal" or typeone == "Binary" then
			if typetwo == "Decimal" or typetwo == "Binary" then
				if resulttype == "Decimal" or resulttype == "Binary" then
					local result
					
					if typeone == "Binary" then
						numberone = ToDecimal(numberone)
					end
					
					if typetwo == "Binary" then
						numbertwo = ToDecimal(numbertwo)
					end
					
					if operator == "+" then
						result = numberone + numbertwo
					elseif operator == "-" then
						result = numberone - numbertwo
					elseif operator == "/" then
						result = numberone / numbertwo
					elseif operator == "*" then
						result = numberone * numbertwo
					elseif operator == "%" then
						result = numberone % numbertwo
					elseif operator == "^" then
						result = numberone ^ numbertwo
					end
					
					if resulttype == "Binary" then
						return ToBinary(result, binary_dots)
					elseif resulttype == "Decimal" then
						return result
					end
				else
					Dialog.Message("Error", "resulttype must be Decimal or Binary")
				end
			else
				Dialog.Message("Error", "typetwo must be Decimal or Binary")
			end
		else
			Dialog.Message("Error", "typeone must be Decimal or Binary")
		end
	else
		Dialog.Message("Error", "You didn't specify a valid operator. Valid operators are: + - // * % ^. You need to specify them in a string")
	end
end

function String.Reverse(data)
	local Length = String.Length(data)
	local result = ""
	local char = ""
	
	for x = Length, 1, -1 do
		char = String.Mid(data, x, 1)
		result = result..char
	end
	
	return result
end