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                 if filename == nil then
  41                         return nil, 'Filename is empty'
  42                 end
  43                 if #filename == 0 then
  44                         return nil, 'Filename length is zero'
  45                 end
  46
  47                 infile = io.open(filename, "rb")
  48                 if infile == nil then
  49                         return nil, string.format("Could not read file %s",filename)
  50                 end
  51                 local t = infile:read("*all")
  52                 len = string.len(t)
  53                 local  _,hex = bin.unpack(("H%d"):format(len),t)
  54                 io.close(infile)
  55                 return hex
  56         end,
  57
  58         ------------ string split function
  59         Split = function( inSplitPattern, outResults )
  60                 if not outResults then
  61                         outResults = {}
  62                 end
  63                 local start = 1
  64                 local splitStart, splitEnd = string.find( self, inSplitPattern, start )
  65                 while splitStart do
  66                         table.insert( outResults, string.sub( self, start, splitStart-1 ) )
  67                         start = splitEnd + 1
  68                         splitStart, splitEnd = string.find( self, inSplitPattern, start )
  69                 end
  70                 table.insert( outResults, string.sub( self, start ) )
  71                 return outResults
  72         end,
  73
  74         ------------ CRC-16 ccitt checksums
  75
  76         -- Takes a hex string and calculates a crc16
  77         Crc16 = function(s)
  78                 if s == nil then return nil end
  79                 if #s == 0 then return nil end
  80                 if  type(s) == 'string' then
  81                         local utils = require('utils')
  82                         local asc = utils.ConvertHexToAscii(s)
  83                         local hash = core.crc16(asc)
  84                         return hash
  85                 end
  86                 return nil
  87         end,
  88
  89         -- input parameter is a string
  90         -- Swaps the endianess and returns a number,
  91         -- IE:  'cd7a' -> '7acd'  -> 0x7acd
  92         SwapEndianness = function(s, len)
  93                 if s == nil then return nil end
  94                 if #s == 0 then return '' end
  95                 if  type(s) ~= 'string' then return nil end
  96
  97                 local retval = 0
  98                 if len == 16 then
  99                         local t = s:sub(3,4)..s:sub(1,2)
 100                         retval = tonumber(t,16)
 101                 elseif len == 24 then
 102                         local t = s:sub(5,6)..s:sub(3,4)..s:sub(1,2)
 103                         retval = tonumber(t,16)
 104                 elseif len == 32 then
 105                         local t = s:sub(7,8)..s:sub(5,6)..s:sub(3,4)..s:sub(1,2)
 106                         retval = tonumber(t,16)
 107                 end
 108                 return retval
 109         end,
 110
 111         -- input parameter is a string
 112         -- Swaps the endianess and returns a string,
 113         -- IE:  'cd7a' -> '7acd'  -> 0x7acd
 114         SwapEndiannessStr = function(s, len)
 115                 if s == nil then return nil end
 116                 if #s == 0 then return '' end
 117                 if  type(s) ~= 'string' then return nil end
 118
 119                 local retval
 120                 if len == 16 then
 121                         retval = s:sub(3,4)..s:sub(1,2)
 122                 elseif len == 24 then
 123                         retval = s:sub(5,6)..s:sub(3,4)..s:sub(1,2)
 124                 elseif len == 32 then
 125                         retval = s:sub(7,8)..s:sub(5,6)..s:sub(3,4)..s:sub(1,2)
 126                 end
 127                 return retval
 128         end,
 129         ------------ CONVERSIONS
 130
 131         --
 132         -- Converts DECIMAL to HEX
 133     ConvertDecToHex = function(IN)
 134                 local B,K,OUT,I,D=16,"0123456789ABCDEF","",0
 135                 while IN>0 do
 136                         I=I+1
 137                         IN , D = math.floor(IN/B), math.modf(IN,B)+1
 138                         OUT=string.sub(K,D,D)..OUT
 139                 end
 140                 return OUT
 141         end,
 142         ---
 143         -- Convert Byte array to string of hex
 144         ConvertBytesToHex = function(bytes)
 145                 if #bytes == 0 then
 146                         return ''
 147                 end
 148                 local s={}
 149                 for i = 1, #(bytes) do
 150                         s[i] =   string.format("%02X",bytes[i])
 151                 end
 152                 return table.concat(s)
 153         end,
 154         -- Convert byte array to string with ascii
 155     ConvertBytesToAscii = function(bytes)
 156                 if #bytes == 0 then
 157                         return ''
 158                 end
 159                 local s={}
 160                 for i = 1, #(bytes) do
 161                         s[i] = string.char(bytes[i])
 162                 end
 163                 return table.concat(s)
 164         end,
 165         ConvertHexToBytes = function(s)
 166                 local t={}
 167                 if s == nil then return t end
 168                 if #s == 0 then return t end
 169                 for k in s:gmatch"(%x%x)" do
 170                         table.insert(t,tonumber(k,16))
 171                 end
 172                 return t
 173         end,
 174         ConvertAsciiToBytes = function(s)
 175                 local t={}
 176                 if s == nil then return t end
 177                 if #s == 0 then return t end
 178
 179                 for k in s:gmatch"(.)" do
 180                         table.insert(t, string.byte(k))
 181                 end
 182                 return t
 183         end,
 184         ConvertHexToAscii = function(s)
 185                 local t={}
 186                 if s == nil then return t end
 187                 if #s == 0 then return t end
 188                 for k in s:gmatch"(%x%x)" do
 189                         table.insert(t, string.char(tonumber(k,16)))
 190                 end
 191                 return  table.concat(t)
 192         end,
 193
 194         -- function convertStringToBytes(str)
 195         -- local bytes = {}
 196         -- local strLength = string.len(str)
 197         -- for i=1,strLength do
 198                 -- table.insert(bytes, string.byte(str, i))
 199         -- end
 200
 201         -- return bytes
 202 -- end
 203
 204 -- function convertBytesToString(bytes)
 205         -- local bytesLength = table.getn(bytes)
 206         -- local str = ""
 207         -- for i=1,bytesLength do
 208                 -- str = str .. string.char(bytes[i])
 209         -- end
 210
 211         -- return str
 212 -- end
 213
 214 -- function convertHexStringToBytes(str)
 215         -- local bytes = {}
 216         -- local strLength = string.len(str)
 217         -- for k=2,strLength,2 do
 218                 -- local hexString = "0x" .. string.sub(str, (k - 1), k)
 219                 -- table.insert(bytes, hex.to_dec(hexString))
 220         -- end
 221
 222         -- return bytes
 223 -- end
 224
 225 -- function convertBytesToHexString(bytes)
 226         -- local str = ""
 227         -- local bytesLength = table.getn(bytes)
 228         -- for i=1,bytesLength do
 229                 -- local hexString = string.sub(hex.to_hex(bytes[i]), 3)
 230                 -- if string.len(hexString) == 1 then
 231                         -- hexString = "0" .. hexString
 232                 -- end
 233                 -- str = str .. hexString
 234         -- end
 235
 236         -- return str
 237 -- end
 238
 239 }
 240 return Utils