git.zerfleddert.de Git - proxmark3-svn/blob - client/lualibs/utils.lua

   1 --[[
   2         This may be moved to a separate library at some point (Holiman)
   3 --]]
   4 local Utils =
   5 {
   6         -- Asks the user for Yes or No
   7         confirm = function(message, ...)
   8                 local answer
   9                 message = message .. " [y/n] ?"
  10                 repeat
  11                         io.write(message)
  12                         io.flush()
  13                         answer=io.read()
  14                         if answer == 'Y' or answer == "y" then
  15                                 return true
  16                         elseif answer == 'N' or answer == 'n' then
  17                                 return false
  18                         end
  19                 until false
  20         end,
  21         ---
  22         -- Asks the user for input
  23         input = function (message , default)
  24                 local answer
  25                 if default ~= nil then
  26                         message = message .. " (default: ".. default.. " )"
  27                 end
  28                 message = message .." \n > "
  29                 io.write(message)
  30                 io.flush()
  31                 answer=io.read()
  32                 if answer == '' then answer = default end
  33
  34                 return answer
  35         end,
  36
  37         ------------ FILE READING
  38         ReadDumpFile = function (filename)
  39
  40                 filename = filename or 'dumpdata.bin'
  41                 if #filename == 0 then
  42                         return nil, 'Filename length is zero'
  43                 end
  44
  45                 infile = io.open(filename, "rb")
  46                 if infile == nil then
  47                         return nil, string.format("Could not read file %s",filename)
  48                 end
  49                 local t = infile:read("*all")
  50                 len = string.len(t)
  51                 local  _,hex = bin.unpack(("H%d"):format(len),t)
  52                 io.close(infile)
  53                 return hex
  54         end,
  55
  56         ------------ string split function
  57         Split = function( inSplitPattern, outResults )
  58                 if not outResults then
  59                         outResults = {}
  60                 end
  61                 local start = 1
  62                 local splitStart, splitEnd = string.find( self, inSplitPattern, start )
  63                 while splitStart do
  64                         table.insert( outResults, string.sub( self, start, splitStart-1 ) )
  65                         start = splitEnd + 1
  66                         splitStart, splitEnd = string.find( self, inSplitPattern, start )
  67                 end
  68                 table.insert( outResults, string.sub( self, start ) )
  69                 return outResults
  70         end,
  71
  72
  73         ------------ CRC-16 ccitt checksums
  74         -- Takes a hex string and calculates a crc16
  75         Crc16 = function(s)
  76                 if s == nil then return nil end
  77                 if #s == 0 then return nil end
  78                 if  type(s) == 'string' then
  79                         local utils = require('utils')
  80                         local asc = utils.ConvertHexToAscii(s)
  81                         local hash = core.crc16(asc)
  82                         return hash
  83                 end
  84                 return nil
  85         end,
  86
  87         ------------ CRC-64 ecma checksums
  88         -- Takes a hex string and calculates a crc64 ecma
  89         Crc64 = function(s)
  90                 if s == nil then return nil end
  91                 if #s == 0 then return nil end
  92                 if  type(s) == 'string' then
  93                         local utils = require('utils')
  94                         local asc = utils.ConvertHexToAscii(s)
  95                         local hash = core.crc64(asc)
  96                         return hash
  97                 end
  98                 return nil
  99         end,
 100
 101         ------------ SHA1 hash
 102         -- Takes a string and calculates a SHA1 hash
 103         Sha1 = function(s)
 104                 if s == nil then return nil end
 105                 if #s == 0 then return nil end
 106                 if  type(s) == 'string' then
 107                         local utils = require('utils')
 108                         --local asc = utils.ConvertHexToAscii(s)
 109                         local hash = core.sha1(s)
 110                         return hash
 111                 end
 112                 return nil
 113         end,
 114         -- Takes a hex string and calculates a SHA1 hash
 115         Sha1Hex = function(s)
 116                 if s == nil then return nil end
 117                 if #s == 0 then return nil end
 118                 if  type(s) == 'string' then
 119                         local utils = require('utils')
 120                         local asc = utils.ConvertHexToAscii(s)
 121                         local hash = core.sha1(asc)
 122                         return hash
 123                 end
 124                 return nil
 125         end,
 126
 127
 128         -- input parameter is a string
 129         -- Swaps the endianess and returns a number,
 130         -- IE:  'cd7a' -> '7acd'  -> 0x7acd
 131         SwapEndianness = function(s, len)
 132                 if s == nil then return nil end
 133                 if #s == 0 then return '' end
 134                 if  type(s) ~= 'string' then return nil end
 135
 136                 local retval = 0
 137                 if len == 16 then
 138                         local t = s:sub(3,4)..s:sub(1,2)
 139                         retval = tonumber(t,16)
 140                 elseif len == 24 then
 141                         local t = s:sub(5,6)..s:sub(3,4)..s:sub(1,2)
 142                         retval = tonumber(t,16)
 143                 elseif len == 32 then
 144                         local t = s:sub(7,8)..s:sub(5,6)..s:sub(3,4)..s:sub(1,2)
 145                         retval = tonumber(t,16)
 146                 end
 147                 return retval
 148         end,
 149
 150         -- input parameter is a string
 151         -- Swaps the endianess and returns a string,
 152         -- IE:  'cd7a' -> '7acd'  -> 0x7acd
 153         SwapEndiannessStr = function(s, len)
 154                 if s == nil then return nil end
 155                 if #s == 0 then return '' end
 156                 if  type(s) ~= 'string' then return nil end
 157
 158                 local retval
 159                 if len == 16 then
 160                         retval = s:sub(3,4)..s:sub(1,2)
 161                 elseif len == 24 then
 162                         retval = s:sub(5,6)..s:sub(3,4)..s:sub(1,2)
 163                 elseif len == 32 then
 164                         retval = s:sub(7,8)..s:sub(5,6)..s:sub(3,4)..s:sub(1,2)
 165                 end
 166                 return retval
 167         end,
 168         ------------ CONVERSIONS
 169
 170         --
 171         -- Converts DECIMAL to HEX
 172     ConvertDecToHex = function(IN)
 173                 local B,K,OUT,I,D=16,"0123456789ABCDEF","",0
 174                 while IN>0 do
 175                         I=I+1
 176                         IN , D = math.floor(IN/B), math.modf(IN,B)+1
 177                         OUT = string.sub(K,D,D)..OUT
 178                 end
 179                 return OUT
 180         end,
 181         ---
 182         -- Convert Byte array to string of hex
 183         ConvertBytesToHex = function(bytes)
 184                 if #bytes == 0 then
 185                         return ''
 186                 end
 187                 local s={}
 188                 for i = 1, #(bytes) do
 189                         s[i] = string.format("%02X",bytes[i])
 190                 end
 191                 return table.concat(s)
 192         end,
 193         -- Convert byte array to string with ascii
 194     ConvertBytesToAscii = function(bytes)
 195                 if #bytes == 0 then
 196                         return ''
 197                 end
 198                 local s={}
 199                 for i = 1, #(bytes) do
 200                         s[i] = string.char(bytes[i])
 201                 end
 202                 return table.concat(s)
 203         end,
 204         ConvertHexToBytes = function(s)
 205                 local t={}
 206                 if s == nil then return t end
 207                 if #s == 0 then return t end
 208                 for k in s:gmatch"(%x%x)" do
 209                         table.insert(t,tonumber(k,16))
 210                 end
 211                 return t
 212         end,
 213         ConvertAsciiToBytes = function(s, reverse)
 214                 local t = {}
 215                 if s == nil then return t end
 216                 if #s == 0 then return t end
 217
 218                 for k in s:gmatch"(.)" do
 219                         table.insert(t, string.byte(k))
 220                 end
 221
 222                 if not reverse then
 223                         return t
 224                 end
 225
 226                 local rev = {}
 227                 if reverse then
 228                         for i = #t, 1,-1 do
 229                                 table.insert(rev, t[i] )
 230                         end
 231                 end
 232                 return rev
 233         end,
 234
 235         ConvertHexToAscii = function(s)
 236                 local t={}
 237                 if s == nil then return t end
 238                 if #s == 0 then return t end
 239                 for k in s:gmatch"(%x%x)" do
 240                         table.insert(t, string.char(tonumber(k,16)))
 241                 end
 242                 return  table.concat(t)
 243         end,
 244
 245         Chars2num = function(s)
 246         return (s:byte(1)*16777216)+(s:byte(2)*65536)+(s:byte(3)*256)+(s:byte(4))
 247         end,
 248
 249         -- use length of string to determine 8,16,32,64 bits
 250         bytes_to_int = function(str,endian,signed)
 251                 local t={str:byte(1,-1)}
 252                 if endian=="big" then --reverse bytes
 253                         local tt={}
 254                         for k=1,#t do
 255                                 tt[#t-k+1]=t[k]
 256                         end
 257                         t=tt
 258                 end
 259                 local n=0
 260                 for k=1,#t do
 261                         n=n+t[k]*2^((k-1)*8)
 262                 end
 263                 if signed then
 264                         n = (n > 2^(#t*8-1) -1) and (n - 2^(#t*8)) or n -- if last bit set, negative.
 265                 end
 266                 return n
 267         end,
 268
 269         -- function convertStringToBytes(str)
 270         -- local bytes = {}
 271         -- local strLength = string.len(str)
 272         -- for i=1,strLength do
 273                 -- table.insert(bytes, string.byte(str, i))
 274         -- end
 275
 276         -- return bytes
 277 -- end
 278
 279 -- function convertBytesToString(bytes)
 280         -- local bytesLength = table.getn(bytes)
 281         -- local str = ""
 282         -- for i=1,bytesLength do
 283                 -- str = str .. string.char(bytes[i])
 284         -- end
 285
 286         -- return str
 287 -- end
 288
 289 -- function convertHexStringToBytes(str)
 290         -- local bytes = {}
 291         -- local strLength = string.len(str)
 292         -- for k=2,strLength,2 do
 293                 -- local hexString = "0x" .. string.sub(str, (k - 1), k)
 294                 -- table.insert(bytes, hex.to_dec(hexString))
 295         -- end
 296
 297         -- return bytes
 298 -- end
 299
 300 -- function convertBytesToHexString(bytes)
 301         -- local str = ""
 302         -- local bytesLength = table.getn(bytes)
 303         -- for i=1,bytesLength do
 304                 -- local hexString = string.sub(hex.to_hex(bytes[i]), 3)
 305                 -- if string.len(hexString) == 1 then
 306                         -- hexString = "0" .. hexString
 307                 -- end
 308                 -- str = str .. hexString
 309         -- end
 310
 311         -- return str
 312 -- end
 313
 314 }
 315 return Utils