ADD: added some changes from Marshmellow

[proxmark3-svn] / client / lualibs / utils.lua

diff --git a/client/lualibs/utils.lua b/client/lualibs/utils.lua
index 3015c4195c98c55080bb50477a2fc1930a7a9046..a968fde2a90c3b2218b6e67aa005bdeec7486db6 100644 (file)
--- a/client/lualibs/utils.lua
+++ b/client/lualibs/utils.lua
@@ -71,8 +71,8 @@ local Utils =
                return outResults\r
        end,\r
        \r
-       ------------ CRC-16 ccitt checksums\r
        \r
+       ------------ CRC-16 ccitt checksums\r
        -- Takes a hex string and calculates a crc16\r
        Crc16 = function(s)\r
                if s == nil then return nil end\r
@@ -85,7 +85,22 @@ local Utils =
                end\r
                return nil\r
        end,\r
-\r
+       \r
+       ------------ CRC-64 ecma checksums\r
+       -- Takes a hex string and calculates a crc64 ecma\r
+       Crc64 = function(s)\r
+               if s == nil then return nil end\r
+               if #s == 0 then return nil end\r
+               if  type(s) == 'string' then\r
+                       local utils = require('utils')\r
+                       local asc = utils.ConvertHexToAscii(s)\r
+                       local hash = core.crc64(asc)\r
+                       return hash\r
+               end\r
+               return nil\r
+       end,\r
+       \r
+       \r
        -- input parameter is a string\r
        -- Swaps the endianess and returns a number,  \r
        -- IE:  'cd7a' -> '7acd'  -> 0x7acd\r
@@ -135,7 +150,7 @@ local Utils =
                while IN>0 do\r
                        I=I+1\r
                        IN , D = math.floor(IN/B), math.modf(IN,B)+1\r
-                       OUT=string.sub(K,D,D)..OUT\r
+                       OUT = string.sub(K,D,D)..OUT\r
                end\r
                return OUT\r
        end,\r
@@ -171,16 +186,28 @@ local Utils =
                end\r
                return t\r
        end,\r
-       ConvertAsciiToBytes = function(s)\r
-               local t={}\r
+       ConvertAsciiToBytes = function(s, reverse)\r
+               local t = {}\r
                if s == nil then return t end\r
                if #s == 0 then return t end\r
                \r
                for k in s:gmatch"(.)" do\r
                        table.insert(t, string.byte(k))\r
                end\r
-               return t\r
+               \r
+               if not reverse then\r
+                       return t\r
+               end\r
+       \r
+               local rev = {}\r
+               if reverse then\r
+                       for i = #t, 1,-1 do\r
+                               table.insert(rev, t[i] )\r
+                       end\r
+               end\r
+               return rev\r
        end,\r
+       \r
        ConvertHexToAscii = function(s)\r
                local t={}\r
                if s == nil then return t end\r
@@ -191,6 +218,30 @@ local Utils =
                return  table.concat(t) \r
        end,\r
        \r
+       Chars2num = function(s)\r
+        return (s:byte(1)*16777216)+(s:byte(2)*65536)+(s:byte(3)*256)+(s:byte(4))\r
+       end,\r
+       \r
+       -- use length of string to determine 8,16,32,64 bits\r
+       bytes_to_int = function(str,endian,signed) \r
+               local t={str:byte(1,-1)}\r
+               if endian=="big" then --reverse bytes\r
+                       local tt={}\r
+                       for k=1,#t do\r
+                               tt[#t-k+1]=t[k]\r
+                       end\r
+                       t=tt\r
+               end\r
+               local n=0\r
+               for k=1,#t do\r
+                       n=n+t[k]*2^((k-1)*8)\r
+               end\r
+               if signed then\r
+                       n = (n > 2^(#t*8-1) -1) and (n - 2^(#t*8)) or n -- if last bit set, negative.\r
+               end\r
+               return n\r
+       end,\r
+       \r
        -- function convertStringToBytes(str)\r
        -- local bytes = {}\r
        -- local strLength = string.len(str)\r