fixing the crash on exit

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

--[[
Handle Proxmark USB Commands 
--]]

local _commands = require('usb_cmd')

local _reverse_lookup,k,v = {}
        for k, v in pairs(_commands) do
                _reverse_lookup[v] =  k
        end
        _commands.tostring = function(command)
        if(type(command) == 'number') then
                return ("%s (%d)"):format(_reverse_lookup[command]or "ERROR UNDEFINED!", command) 
        end
        return ("Error, numeric argument expected, got : %s"):format(tostring(command))
end

Command = {

        new = function(self, o)

                local o = o or {}   -- create object if user does not provide one
                setmetatable(o, self) -- DIY inheritance a'la javascript
                self.__index = self

                o.cmd = o.cmd or _commands.CMD_UNKNOWN
                --o.arg1 = "test"
                o.arg1 = o.arg1 or 0
                o.arg2 = o.arg2 or 0
                o.arg3 = o.arg3 or 0 
                local data = o.data or "0"

                if(type(data) == 'string') then
                        -- We need to check if it is correct length, otherwise pad it
                        local len = string.len(data)
                        if(len < 1024) then  
                                --Should be 1024 hex characters to represent 512 bytes of data 
                                data = data .. string.rep("0",1024 - len ) 
                        end
                        if(len > 1024) then
                                -- OOps, a bit too much data here
                                print( ( "WARNING: data size too large, was %s chars, will be truncated "):format(len) )
                                --
                                data = data:sub(1,1024)
                        end
                else 
                        print(("WARNING; data was NOT a (hex-) string, but was %s"):format(type(data)))
                end
                o.data = data
                
                return o
        end,
        parse = function (packet)
                local count,cmd,arg1,arg2,arg3,data = bin.unpack('LLLLH512',packet)
                return Command:new{cmd = cmd, arg1 = arg1, arg2 = arg2, arg3 = arg3, data = data}
        end,
}
function Command:__tostring()
        local output = ("%s\r\nargs : (%s, %s, %s)\r\ndata:\r\n%s\r\n"):format(
                _commands.tostring(self.cmd),
                tostring(self.arg1),
                tostring(self.arg2),
                tostring(self.arg3),
                tostring(self.data))
        return output
end
function Command:getBytes()
        --If a hex-string has been used
        local data  = self.data
        local cmd = self.cmd 
        local arg1, arg2, arg3 = self.arg1, self.arg2, self.arg3
        return bin.pack("LLLLH",cmd, arg1, arg2, arg3, data);
end
return _commands