X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/cd5767d43da36aa44a78bd4dcfbd7016349da3c6..3ac59c7fed24cc69e2c9f626e5e4392769779e13:/client/lualibs/utils.lua

diff --git a/client/lualibs/utils.lua b/client/lualibs/utils.lua
index bff89c5f..f7749ca6 100644
--- a/client/lualibs/utils.lua
+++ b/client/lualibs/utils.lua
@@ -33,20 +33,115 @@ 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,
+	
+	-- input parameter is a string
+	-- Swaps the endianess and returns a string,  
+	-- IE:  'cd7a' -> '7acd'  -> 0x7acd
+	SwapEndiannessStr = 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
+		if len == 16 then
+			retval = s:sub(3,4)..s:sub(1,2)
+		elseif len == 24 then
+			retval = s:sub(5,6)..s:sub(3,4)..s:sub(1,2)
+		elseif len == 32 then
+			retval = s:sub(7,8)..s:sub(5,6)..s:sub(3,4)..s:sub(1,2)
+		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
-			IN,D=math.floor(IN/B),math.mod(IN,B)+1
-			OUT=string.sub(K,D,D)..OUT
+			IN , D = math.floor(IN/B), math.modf(IN,B)+1
+			OUT = string.sub(K,D,D)..OUT
 		end
 		return OUT
 	end,
 	---
 	-- Convert Byte array to string of hex
-	ConvertBytes2HexString = function(bytes)
+	ConvertBytesToHex = function(bytes)
 		if #bytes == 0 then
 			return ''
 		end
@@ -57,7 +152,7 @@ local Utils =
 		return table.concat(s)
 	end,	
 	-- Convert byte array to string with ascii
-    ConvertBytesToAsciiString = function(bytes)
+    ConvertBytesToAscii = function(bytes)
 		if #bytes == 0 then
 			return ''
 		end
@@ -67,7 +162,7 @@ local Utils =
 		end
 		return table.concat(s)		
 	end,	 
-	ConvertHexStringToBytes = function(s)
+	ConvertHexToBytes = function(s)
 		local t={}
 		if s == nil then return t end
 		if #s == 0 then return t end
@@ -76,7 +171,7 @@ local Utils =
 		end
 		return t
 	end,
-	ConvertAsciiStringToBytes = function(s)
+	ConvertAsciiToBytes = function(s)
 		local t={}
 		if s == nil then return t end
 		if #s == 0 then return t end
@@ -86,6 +181,39 @@ local Utils =
 		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,
+	
+	Chars2num = function(s)
+        return (s:byte(1)*16777216)+(s:byte(2)*65536)+(s:byte(3)*256)+(s:byte(4))
+	end,
+	
+	-- use length of string to determine 8,16,32,64 bits
+	bytes_to_int = function(str,endian,signed) 
+		local t={str:byte(1,-1)}
+		if endian=="big" then --reverse bytes
+			local tt={}
+			for k=1,#t do
+				tt[#t-k+1]=t[k]
+			end
+			t=tt
+		end
+		local n=0
+		for k=1,#t do
+			n=n+t[k]*2^((k-1)*8)
+		end
+		if signed then
+			n = (n > 2^(#t*8-1) -1) and (n - 2^(#t*8)) or n -- if last bit set, negative.
+		end
+		return n
+	end,
 	
 	-- function convertStringToBytes(str)
 	-- local bytes = {}