FIX: a solution for the issue "hf mf esave - always saves 4K"

FIX: a solution for the issue "hf eload, esave, cload, save - filepath variable too short"
CHG: minor code clean up.
ADD: AES / CRC16 for lua. (and tnp3xx scripts.)
ADD: tnp3dump.lua  script to dump tnp3xx tags.
ADD: tnp3sim.lua script to let PM3 imitate an tnp3xx tag. Needs to be tested live

client/lualibs/utils.lua

@@ -33,9 +33,86 @@ local Utils =
 
 		return answer
 	end,
+	
+	------------ FILE READING
+	ReadDumpFile = function (filename)
+	
+		if filename == nil then 
+			return nil, 'Filename is empty'
+		end
+		if #filename == 0 then
+			return nil, 'Filename length is zero'
+		end
+
+		infile = io.open(filename, "rb")
+		if infile == nil then 
+			return nil, string.format("Could not read file %s",filename)
+		end
+		local t = infile:read("*all")
+		len = string.len(t)
+		local  _,hex = bin.unpack(("H%d"):format(len),t)
+		io.close(infile)
+		return hex
+	end,
+	
+	------------ string split function
+	Split = function( inSplitPattern, outResults )
+		if not outResults then
+			outResults = {}
+		end
+		local start = 1
+		local splitStart, splitEnd = string.find( self, inSplitPattern, start )
+		while splitStart do
+			table.insert( outResults, string.sub( self, start, splitStart-1 ) )
+			start = splitEnd + 1
+			splitStart, splitEnd = string.find( self, inSplitPattern, start )
+		end
+		table.insert( outResults, string.sub( self, start ) )
+		return outResults
+	end,
+	
+	------------ CRC-16 ccitt checksums
+	
+	-- Takes a hex string and calculates a crc16
+	Crc16 = function(s)
+		if s == nil then return nil end
+		if #s == 0 then return nil end
+		if  type(s) == 'string' then
+			local utils = require('utils')
+			local asc = utils.ConvertHexToAscii(s)
+			local hash = core.crc16(asc)
+			return hash
+		end
+		return nil
+	end,
+
+	-- input parameter is a string
+	-- Swaps the endianess and returns a number,  
+	-- IE:  'cd7a' -> '7acd'  -> 0x7acd
+	SwapEndianness = function(s, len)
+		if s == nil then return nil end
+		if #s == 0 then return '' end
+		if  type(s) ~= 'string' then return nil end
+		
+		local retval = 0
+		if len == 16 then
+			local t = s:sub(3,4)..s:sub(1,2)
+			retval = tonumber(t,16)
+		elseif len == 24 then
+			local t = s:sub(5,6)..s:sub(3,4)..s:sub(1,2)
+			retval = tonumber(t,16)
+		elseif len == 32 then
+			local t = s:sub(7,8)..s:sub(5,6)..s:sub(3,4)..s:sub(1,2)
+			retval = tonumber(t,16)
+		end
+		return retval
+	end,
+	
+	------------ CONVERSIONS
+	
 	--
 	-- Converts DECIMAL to HEX
-    ConvertDec2Hex = function(IN)
+    ConvertDecToHex = function(IN)
 		local B,K,OUT,I,D=16,"0123456789ABCDEF","",0
 		while IN>0 do
 			I=I+1
@@ -46,12 +123,100 @@ local Utils =
 	end,
 	---
 	-- Convert Byte array to string of hex
-	ConvertBytes2String = function(bytes)
-		s = {}
+	ConvertBytesToHex = function(bytes)
+		if #bytes == 0 then
+			return ''
+		end
+		local s={}
 		for i = 1, #(bytes) do
 			s[i] =   string.format("%02X",bytes[i]) 
 		end
 		return table.concat(s)
 	end,	
+	-- Convert byte array to string with ascii
+    ConvertBytesToAscii = function(bytes)
+		if #bytes == 0 then
+			return ''
+		end
+		local s={}
+		for i = 1, #(bytes) do
+			s[i] = string.char(bytes[i]) 
+		end
+		return table.concat(s)		
+	end,	 
+	ConvertHexToBytes = function(s)
+		local t={}
+		if s == nil then return t end
+		if #s == 0 then return t end
+		for k in s:gmatch"(%x%x)" do
+			table.insert(t,tonumber(k,16))
+		end
+		return t
+	end,
+	ConvertAsciiToBytes = function(s)
+		local t={}
+		if s == nil then return t end
+		if #s == 0 then return t end
+		
+		for k in s:gmatch"(.)" do
+			table.insert(t, string.byte(k))
+		end
+		return t
+	end,
+	ConvertHexToAscii = function(s)
+		local t={}
+		if s == nil then return t end
+		if #s == 0 then return t end
+		for k in s:gmatch"(%x%x)" do
+			table.insert(t, string.char(tonumber(k,16)))
+		end
+		return  table.concat(t)	
+	end,
+	
+	-- function convertStringToBytes(str)
+	-- local bytes = {}
+	-- local strLength = string.len(str)
+	-- for i=1,strLength do
+		-- table.insert(bytes, string.byte(str, i))
+	-- end
+
+	-- return bytes
+-- end
+
+-- function convertBytesToString(bytes)
+	-- local bytesLength = table.getn(bytes)
+	-- local str = ""
+	-- for i=1,bytesLength do
+		-- str = str .. string.char(bytes[i])
+	-- end
+
+	-- return str
+-- end
+
+-- function convertHexStringToBytes(str)
+	-- local bytes = {}
+	-- local strLength = string.len(str)
+	-- for k=2,strLength,2 do
+		-- local hexString = "0x" .. string.sub(str, (k - 1), k)
+		-- table.insert(bytes, hex.to_dec(hexString))
+	-- end
+
+	-- return bytes
+-- end
+
+-- function convertBytesToHexString(bytes)
+	-- local str = ""
+	-- local bytesLength = table.getn(bytes)
+	-- for i=1,bytesLength do
+		-- local hexString = string.sub(hex.to_hex(bytes[i]), 3)
+		-- if string.len(hexString) == 1 then
+			-- hexString = "0" .. hexString
+		-- end
+		-- str = str .. hexString
+	-- end
+
+	-- return str
+-- end
+
 }
 return Utils