X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/2b61c242127b54c6f8a92bf6991cdf9bd9aa27af..3ac59c7fed24cc69e2c9f626e5e4392769779e13:/client/lualibs/utils.lua

diff --git a/client/lualibs/utils.lua b/client/lualibs/utils.lua
index 3015c419..f7749ca6 100644
--- a/client/lualibs/utils.lua
+++ b/client/lualibs/utils.lua
@@ -135,7 +135,7 @@ local Utils =
 		while IN>0 do
 			I=I+1
 			IN , D = math.floor(IN/B), math.modf(IN,B)+1
-			OUT=string.sub(K,D,D)..OUT
+			OUT = string.sub(K,D,D)..OUT
 		end
 		return OUT
 	end,
@@ -191,6 +191,30 @@ local Utils =
 		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 = {}
 	-- local strLength = string.len(str)