proxmark3/client/lualibs/utils.lua

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2014-08-29 15:09:23 +08:00
--[[
This may be moved to a separate library at some point (Holiman)
--]]
local Utils =
{
-- Asks the user for Yes or No
confirm = function(message, ...)
local answer
message = message .. " [y/n] ?"
repeat
io.write(message)
io.flush()
answer=io.read()
if answer == 'Y' or answer == "y" then
return true
elseif answer == 'N' or answer == 'n' then
return false
end
until false
end,
---
-- Asks the user for input
input = function (message , default)
local answer
if default ~= nil then
message = message .. " (default: ".. default.. " )"
end
message = message .." \n > "
io.write(message)
io.flush()
answer=io.read()
if answer == '' then answer = default end
return answer
end,
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------------ 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,
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------------ CONVERSIONS
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--
-- Converts DECIMAL to HEX
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ConvertDecToHex = function(IN)
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local B,K,OUT,I,D=16,"0123456789ABCDEF","",0
while IN>0 do
I=I+1
IN , D = math.floor(IN/B), math.modf(IN,B)+1
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OUT=string.sub(K,D,D)..OUT
end
return OUT
end,
---
-- Convert Byte array to string of hex
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ConvertBytesToHex = function(bytes)
if #bytes == 0 then
return ''
end
local s={}
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for i = 1, #(bytes) do
s[i] = string.format("%02X",bytes[i])
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end
return table.concat(s)
end,
-- Convert byte array to string with ascii
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ConvertBytesToAscii = function(bytes)
if #bytes == 0 then
return ''
end
local s={}
for i = 1, #(bytes) do
s[i] = string.char(bytes[i])
end
return table.concat(s)
end,
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ConvertHexToBytes = 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,tonumber(k,16))
end
return t
end,
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ConvertAsciiToBytes = function(s)
local t={}
if s == nil then return t end
if #s == 0 then return t end
for k in s:gmatch"(.)" do
table.insert(t, string.byte(k))
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,
-- function convertStringToBytes(str)
-- local bytes = {}
-- local strLength = string.len(str)
-- for i=1,strLength do
-- table.insert(bytes, string.byte(str, i))
-- end
-- return bytes
-- end
-- function convertBytesToString(bytes)
-- local bytesLength = table.getn(bytes)
-- local str = ""
-- for i=1,bytesLength do
-- str = str .. string.char(bytes[i])
-- end
-- return str
-- end
-- function convertHexStringToBytes(str)
-- local bytes = {}
-- local strLength = string.len(str)
-- for k=2,strLength,2 do
-- local hexString = "0x" .. string.sub(str, (k - 1), k)
-- table.insert(bytes, hex.to_dec(hexString))
-- end
-- return bytes
-- end
-- function convertBytesToHexString(bytes)
-- local str = ""
-- local bytesLength = table.getn(bytes)
-- for i=1,bytesLength do
-- local hexString = string.sub(hex.to_hex(bytes[i]), 3)
-- if string.len(hexString) == 1 then
-- hexString = "0" .. hexString
-- end
-- str = str .. hexString
-- end
-- return str
-- end
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}
return Utils