X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/9b989c45b942356410416b10e96bc4ca624e4563..f91f0ebb35c1c131e5e255457212a0784c81dcd6:/client/lualibs/utils.lua

diff --git a/client/lualibs/utils.lua b/client/lualibs/utils.lua
index 6b3777db..9b36dfc8 100644
--- a/client/lualibs/utils.lua
+++ b/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
@@ -46,21 +123,55 @@ local Utils =
 	end,
 	---
 	-- Convert Byte array to string of hex
-	ConvertBytes2String = function(bytes)
-		local 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,	
-
-	ConvertStringToBytes = function(s)
+	-- 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 = {}