Subversion Repositories freemyipod

#!/usr/bin/env python

#

#

#    Copyright 2010 TheSeven, benedikt93, Farthen

#

#

#    This file is part of emBIOS.

#

#    emBIOS is free software: you can redistribute it and/or

#    modify it under the terms of the GNU General Public License as

#    published by the Free Software Foundation, either version 2 of the

#    License, or (at your option) any later version.

#

#    emBIOS is distributed in the hope that it will be useful,

#    but WITHOUT ANY WARRANTY; without even the implied warranty of

#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

#    See the GNU General Public License for more details.

#

#    You should have received a copy of the GNU General Public License

#    along with emBIOS.  If not, see <http://www.gnu.org/licenses/>.

#

#

import sys

import os

import inspect

import re

import time

import struct

from functools import wraps

import libembios

from libembios import Error

import libembiosdata

class NotImplementedError(Error):

    pass

class ArgumentError(Error):

    pass

class ArgumentTypeError(Error):

    def __init__(self, expected, seen=False):

        self.expected = expected

        self.seen = seen

    def __str__(self):

        if self.seen:

            return "Expected " + str(self.expected) + " but saw " + str(self.seen)

        else:

            return "Expected " + str(self.expected) + ", but saw something else"

def usage(errormsg=None, specific=False):

    """

        Prints the usage information.

        It is auto generated from various places.

    """

    logger = Logger()

    cmddict= Commandline.cmddict

    doc = {}

    # This sorts the output of various internal functions

    # and puts everything in easy readable form

    for function in cmddict:

        function = cmddict[function].func

        docinfo = {}

        name = function.__name__

        args = inspect.getargspec(function)[0]

        docinfo['varargs'] = False

        if inspect.getargspec(function)[1]:

            docinfo['varargs'] = True

        kwargvalues = inspect.getargspec(function)[3]

        kwargs = {}

        if args:

            if kwargvalues:

                argnum = len(args) - len(kwargvalues)

                kwargnum = len(kwargvalues)

                kwargs = dict(zip(args[argnum:], kwargvalues))

            else:

                argnum = len(args)

        else:

            argnum = 0

        docinfo['args'] = args[1:argnum]

        docinfo['kwargs'] = kwargs

        if function.__doc__:

            # strip unneccessary whitespace

            docinfo['documentation'] = re.sub(r'\n        ', '\n', function.__doc__)

        else:

            docinfo['documentation'] = None

        doc[name] = docinfo

    if not specific:

        logger.log("Please provide a command and (if needed) parameters as command line arguments\n\n")

        logger.log("Available commands:\n\n")

    else:

        logger.log("\n")

    for function in sorted(doc.items()):

        function = function[0]

        if specific == False or specific == function:

            logger.log("  " + function + " ")

            for arg in doc[function]['args']:

                logger.log("<" + arg + "> ")

            if doc[function]['kwargs']:

                for kwarg in doc[function]['kwargs']:

                    logger.log("[" + kwarg + "] ")

            if doc[function]['varargs']:

                logger.log("<db1> ... <dbN>")

            if doc[function]['documentation']:

                logger.log(doc[function]['documentation']+"\n")

    logger.log("\n")

    if errormsg:

        logger.error(str(errormsg)+"\n")

    exit(2)

class Logger(object):

    """

        Simple stdout logger.

        Loglevel 4 is most verbose, Loglevel 0 only say something if there is an error.

    """

    def __init__(self):

        # Possible values: 0 (only errors), 1 (warnings), 2 (info, recommended for production use), 3 and more (debug)

        self.loglevel = 3

    def log(self, text):

        sys.stdout.write(text)

    def debug(self, text):

        if self.loglevel >= 3:

            self.log(text)

    def info(self, text):

        if self.loglevel >= 2:

            self.log(text)

    def warning(self, text):

        if self.loglevel >= 1:

            self.log("WARNING: " + text)

    def error(self, text):

        self.log("ERROR: " + text)

def command(func):

    """

        Decorator for all commands.

        The decorated function is called with (self, all, other, arguments, ...)

    """

    @wraps(func)

    def decorator(*args):

        return func(args[0], *args[1:])

    func._command = True

    decorator.func = func

    return decorator

def commandClass(cls):

    """

        Decorator for the class. Sets the self.cmddict of the class

        to all functions decorated with @command

    """

    cls.cmddict = {}

    for attr, value in cls.__dict__.iteritems():

        if getattr(value, 'func', False):

            if getattr(value.func, '_command', False):

                cls.cmddict[value.func.__name__] = value

    return cls

@commandClass

class Commandline(object):

    """

        If you want to create a new commandline function you just need to

        create a function with the name of it in this class and decorate

        it with the decorator @command. If you don't want to call the desired

        function (wrong arguments etc) just raise ArgumentError with or

        without an error message or raise ArgumentCountError

    """

    def __init__(self):

        self.logger = Logger()

        try:

            self.embios = libembios.Embios()

        except libembios.DeviceNotFoundError:

            self.logger.error("No emBIOS device found!")

            exit(1)

        self.getinfo("version")

    def _parsecommand(self, func, args):

        # adds self to the commandline args.

        # this is needed because the functions need access to their class.

        args.insert(0, self)

        if func in self.cmddict:

            try:

                self.cmddict[func](*args)

            except ArgumentError, e:

                usage(e, specific=func)

            except ArgumentError:

                usage("Syntax Error in function '" + func + "'", specific=func)

            except ArgumentTypeError, e:

                usage(e, specific=func)

            except NotImplementedError:

                self.logger.error("This function is not implemented yet!")

            except libembios.DeviceError, e:

                self.logger.error(str(e))

            except ValueError:

                usage(specific=func)

            except TypeError, e:

                if str(e).split(" ", 1)[0] == func + "()":

                    self.logger.error(usage("Argument Error in '" + func + "': Wrong argument count", specific=func))

                else:

                    raise

            except libembios.usb.core.USBError:

                self.logger.error("Problem with USB connection.")

        else:

            usage("No such command")

    @staticmethod

    def _bool(something):

        """

            Converts quite everything into bool.

        """

        if type(something) == bool:

            return something

        elif type(something) == int or type(something) == long:

            return bool(something)

        elif type(something == str):

            truelist = ['true', '1', 't', 'y', 'yes']

            falselist = ['false', '0', 'f', 'n', 'no']

            if something.lower() in truelist:

                return True

            elif something.lower() in falselist:

                return False

        raise ArgumentTypeError("bool", "'"+str(something)+"'")

    @staticmethod

    def _hexint(something):

        """

            Converts quite everything to a hexadecimal represented integer.

            This works for default arguments too, because it returns

            None when it found that it got a NoneType object.

        """

        if type(something) == int or type(something) == long:

            return something

        elif type(something) == str:

            try:

                return int(something, 16)

            except ValueError:

                raise ArgumentTypeError("hexadecimal coded integer", "'"+str(something)+"'")

        elif type(something) == NoneType:

            return None

        else:

            raise ArgumentTypeError("hexadecimal coded integer", "'"+str(something)+"'")

    @staticmethod

    def _hex(integer):

        return "0x%x" % integer

    @command

    def getinfo(self, infotype):

        """

            Get info on the running emBIOS.

            <infotype> may be either of 'version', 'packetsize', 'usermemrange'.

        """

        if infotype == "version":

            resp = self.embios.getversioninfo()

            try:

                hwtype = libembiosdata.hwtypes[resp.hwtypeid]

            except KeyError:

                hwtype = "UNKNOWN (ID = " + self._hex(resp.hwtypeid) + ")"

            self.logger.info("Connected to "+libembiosdata.swtypes[resp.swtypeid] + " v" + str(resp.majorv) + "." + str(resp.minorv) +

                             "." + str(resp.patchv) + " r" + str(resp.revision) + " running on " + hwtype + "\n")

        elif infotype == "packetsize":

            resp = self.embios.getpacketsizeinfo()

            self.logger.info("Maximum packet sizes: "+str(resp))

        elif infotype == "usermemrange":

            resp = self.embios.getusermemrange()

            self.logger.info("The user memory range is "+self._hex(resp.lower)+" - "+self._hex(resp.upper-1))

        else:

            raise ArgumentTypeError("one out of 'version', 'packetsize', 'usermemrange'", infotype)

    @command

    def reset(self, force=False):

        """

            Resets the device"

            If <force> is 1, the reset will be forced, otherwise it will be gracefully,

            which may take some time.

        """

        force = self._bool(force)

        if force: self.logger.info("Resetting forcefully...\n")

        else: self.logger.info("Resetting...\n")

        self.embios.reset(force)

    @command

    def poweroff(self, force=False):

        """

            Powers the device off

            If <force> is 1, the poweroff will be forced, otherwise it will be gracefully,

            which may take some time.

        """

        force = self._bool(force)

        if force: self.logger.info("Resetting forcefully...\n")

        else: self.logger.info("Resetting...\n")

        self.embios.reset(force)

    @command

    def uploadfile(self, addr, filename):

        """

            Uploads a file to the device

            <offset>: the address to upload the file to

            <filename>: the path to the file

        """

        addr = self._hexint(addr)

        try:

            f = open(filename, 'rb')

        except IOError:

            raise ArgumentError("File not readable. Does it exist?")

        self.logger.info("Writing file '"+filename+"' to memory at "+self._hex(addr)+"...")

        with f:

            self.embios.write(addr, f.read())

        f.close()

        self.logger.info("done\n")

    @command

    def downloadfile(self, addr, size, filename):

        """

            Uploads a file to the device

            <offset>: the address to upload the file to

            <size>: the number of bytes to be read

            <filename>: the path to the file

        """

        addr = self._hexint(addr)

        size = self._hexint(size)

        try:

            f = open(filename, 'wb')

        except IOError:

            raise ArgumentError("Can not open file for write!")

        self.logger.info("Reading data from address "+self._hex(addr)+" with the size "+self._hex(size)+" to '"+filename+"'...")

        with f:

            f.write(self.embios.read(addr, size))

        f.close()

        self.logger.info("done\n")

    @command

    def uploadint(self, addr, integer):

        """

            Uploads a single integer to the device

            <addr>: the address to upload the integer to

            <integer>: the integer to upload

        """

        addr = self._hexint(addr)

        integer = self._hexint(integer)

        if integer > 0xFFFFFFFF:

            raise ArgumentError("Specified integer too long")

        data = struct.pack("I", integer)

        self.embios.write(addr, data)

        self.logger.info("Integer '"+self._hex(integer)+"' written successfully to "+self._hex(addr)+"\n")

    @command

    def downloadint(self, addr):

        """

            Downloads a single integer from the device and prints it to the console window

            <addr>: the address to download the integer from

        """

        addr = self._hexint(addr)

        data = self.embios.read(addr, 4)

        integer = struct.unpack("I", data)[0]

        self.logger.info("Integer '"+self._hex(integer)+"' read from address "+self._hex(addr)+"\n")

    @command

    def i2cread(self, bus, slave, addr, size):

        """

            Reads data from an I2C device

            <bus> the bus index

            <slave> the slave address

            <addr> the start address on the I2C device

            <size> the number of bytes to read

        """

        bus = self._hexint(bus)

        slave = self._hexint(slave)

        addr = self._hexint(addr)

        size = self._hexint(size)

        data = self.embios.i2cread(bus, slave, addr, size)

        bytes = struct.unpack("%dB" % len(data), data)

        self.logger.info("Data read from I2C:\n")

        for index, byte in enumerate(bytes):

            self.logger.info("%02X: %02X\n" % (index, byte))

    @command

    def i2cwrite(self, bus, slave, addr, *args):

        """

            Writes data to an I2C device

            <bus> the bus index

            <slave> the slave address

            <addr> the start address on the I2C device

            <db1> ... <dbN> the data in single bytes, encoded in hex,

                seperated by whitespaces, eg. 37 5A 4F EB

        """

        bus = self._hexint(bus)

        slave = self._hexint(slave)

        addr = self._hexint(addr)

        data = ""

        for arg in args:

            data += chr(self._hexint(arg))

        self.logger.info("Writing data to I2C...\n")

        self.embios.i2cwrite(bus, slave, addr, data)

        self.logger.info("done\n")

    @command

    def console(self):

        """

            Reads data from the USB console continuously

        """

        while True:

            resp = self.embios.usbcread()

            self.logger.log(resp.data)

            time.sleep(0.1 / resp.maxsize * (resp.maxsize - len(resp.data)))

    @command

    def writeusbconsole(self, *args):

        """

            Writes the string <db1> ... <dbN> to the USB console.

        """

        text = ""

        for word in args:

            text += word + " "

        text = text[:-1]

        self.logger.info("Writing '"+ text +"' to the usb console\n")

        self.embios.usbcwrite(text)

    @command

    def readdevconsole(self, bitmask):

        """

            Reads data continuously from one or more of the device's consoles.

            <bitmask>: the bitmask of the consoles to read from.

        """

        bitmask = self._hexint(bitmask)

        while True:

            resp = self.embios.cread()

            self.logger.log(resp.data)

            time.sleep(0.1 / resp.maxsize * (resp.maxsize - len(resp.data)))

    @command

    def writedevconsole(self, bitmask, *args):

        """

            Writes the string <db1> ... <dbN> to one or more of the device's consoles.

            <bitmask>: the bitmask of the consoles to write to

        """

        bitmask = self._hexint(bitmask)

        text = ""

        for word in args:

            text += word + " "

        text = text[:-1]

        self.logger.info("Writing '"+text+"' to the device consoles identified with "+self._hex(bitmask)+"\n")

        self.embios.cwrite(text, bitmask)

    @command

    def flushconsolebuffers(self, bitmask):

        """

            flushes one or more of the device consoles' buffers.

            <bitmask>: the bitmask of the consoles to be flushed

        """

        bitmask = self._hexint(bitmask)

        self.logger.info("Flushing consoles identified with the bitmask "+self._hex(bitmask)+"\n")

        self.embios.cflush(bitmask)

    @command

    def getprocinfo(self):

        """

            Fetches data on the currently running processes

        """

        import datetime

        threads = self.embios.getprocinfo()

        self.logger.info("The device has "+str(len(threads))+" running threads:\n\n")

        for thread in threads:

            self.logger.info("  "+thread.name+":\n")

            self.logger.info("    Thread id: "+str(thread.id)+"\n")

            self.logger.info("    Thread type: "+thread.type+"\n")

            self.logger.info("    Thread state: "+thread.state+"\n")

            self.logger.info("    Priority: "+str(thread.priority)+"/256\n")

            self.logger.info("    CPU time (total): "+str(datetime.timedelta(microseconds=thread.cputime_total))+"\n")

            self.logger.info("    Stack address: "+self._hex(thread.stackaddr)+"\n")

            self.logger.info("    Registers:\n")

            for registerrange in range(4):

                self.logger.info("      ")

                for register in range(registerrange, 16, 4):

                    registerrepr = "r"+str(register)

                    self.logger.info("{:3s}: 0x{:08X}    ".format(registerrepr, thread.regs["r"+str(register)]))

                self.logger.info("\n")

            self.logger.info("      cpsr: 0x{:08X}".format(thread.regs.cpsr))

            self.logger.info("\n")

    @command

    def lockscheduler(self):

        """

            Locks (freezes) the scheduler

        """

        self.logger.info("Will now lock scheduler\n")

        self.embios.lockscheduler()

    @command

    def unlockscheduler(self):

        """

            Unlocks (unfreezes) the scheduler

        """

        self.logger.info("Will now unlock scheduler\n")

        self.embios.unlockscheduler()

    @command

    def suspendthread(self, threadid):

        """

            Suspends/resumes the thread with thread ID <threadid>

        """

        threadid = self._hexint(threadid)

        self.logger.info("Suspending the thread with the threadid "+self._hex(threadid)+"\n")

        self.embios.suspendthread(threadid)

    @command

    def resumethread(self, threadid):

        """

            Resumes the thread with thread ID <threadid>

        """

        threadid = self._hexint(threadid)

        self.logger.info("Resuming the thread with the threadid "+self._hex(threadid)+"\n")

        self.embios.resumethread(threadid)

    @command

    def killthread(self, threadid):

        """

            Kills the thread with thread ID <threadid>

        """

        threadid = self._hexint(threadid)

        self.logger.info("Killing the thread with the threadid " + self._hex(threadid) + "\n")

        self.embios.killthread(threadid)

    @command

    def createthread(self, nameptr, entrypoint, stackptr, stacksize, threadtype, priority, state):

        """

            Creates a new thread and returns its thread ID

            <namepointer> a pointer to the thread's name

            <entrypoint> a pointer to the entrypoint of the thread

            <stackpointer> a pointer to the stack of the thread

            <stacksize> the size of the thread's stack

            <type> the thread type, vaild are: 0 => user thread, 1 => system thread

            <priority> the priority of the thread, from 1 to 255

            <state> the thread's initial state, valid are: 1 => ready, 0 => suspended

        """

        nameptr = self._hexint(nameptr)

        entrypoint = self._hexint(entrypoint)

        stackpointer = self._hexint(stackpointer)

        stacksize = self._hexint(stacksize)

        priority = self._hexint(priority)

        data = self.embios.createthread(nameptr, entrypoint, stackptr, stacksize, type, priority, state)

        name = self.embios.readstring(nameptr)

        self.logger.info("Created a thread with the threadid " + data.id + ", the name \"" + name + "\", the entrypoint at " + self._hex(entrypoint) + ", the stack at " + self._hex(stackpointer) + " with a size of " + self._hex(stacksize) + " and a priority of " + self._hex(priority) + "\n")

    @command

    def run(self, filename):

        """

            Uploads the emBIOS application <filename> to

            the memory and executes it

        """

        try:

            f = open(filename, 'rb')

        except IOError:

            raise ArgumentError("File not readable. Does it exist?")

        with f:

            data = self.embios.run(f.read())

        self.logger.info("Executed emBIOS application \"" + data.name + "\" at address " + self._hex(data.baseaddr))

    @command

    def execimage(self, addr):

        """

            Executes the emBIOS application at <addr>.

        """

        addr = self._hexint(addr)

        self.logger.info("Starting emBIOS app at "+self._hex(addr)+"\n")

        self.embios.execimage(addr)

    @command

    def flushcaches(self):

        """

            Flushes the CPUs data and instruction caches.

        """

        self.logger.info("Flushing CPU data and instruction caches...")

        self.embios.flushcaches()

        self.logger.info("done\n")

    @command

    def readbootflash(self, addr_flash, addr_mem, size):

        """

            Reads <size> bytes from bootflash to memory.

            <addr_bootflsh>: the address in bootflash to read from

            <addr_mem>: the address in memory to copy the data to

        """

        addr_flash = self._hexint(addr_flash)

        addr_mem = self._hexint(addr_mem)

        size = self._hexint(size)

        self.logger.info("Dumping boot flash addresses "+self._hex(addr_flash)+" - "+

                         hex(addr_flash+size)+" to "+self._hex(addr_mem)+" - "+self._hex(addr_mem+size)+"\n")

        self.embios.lib.dev.timeout = 5000

        self.embios.bootflashread(addr_mem, addr_flash, size)

    @command

    def writebootflash(self, addr_flash, addr_mem, size, force=False):

        """

            Writes <size> bytes from memory to bootflash.

            ATTENTION: Don't call this unless you really know what you're doing!

            This may BRICK your device (unless it has a good recovery option)

            <addr_mem>: the address in memory to copy the data from

            <addr_bootflsh>: the address in bootflash to write to

            <force>: Use this flag to suppress the 5 seconds delay

        """

        addr_flash = self._hexint(addr_flash)

        addr_mem = self._hexint(addr_mem)

        size = self._hexint(size)

        force = self._bool(force)

        self.logger.info("Writing boot flash from the memory in "+self._hex(addr_mem)+" - "+

                         hex(addr_mem+size)+" to "+self._hex(addr_flash)+" - "+self._hex(addr_flash+size)+"\n")

        if force == False:

            self.logger.info("If this was not what you intended press Ctrl-C NOW")

            for i in range(10):

                self.logger.info(".")

                time.sleep(1)

            self.logger.info("\n")

        self.embios.lib.dev.timeout = 30000

        self.embios.bootflashwrite(addr_mem, addr_flash, size)

    @command

    def runfirmware(self, addr, filename):

        """

            Uploads the firmware in 'filename' to the beginning of the

            user memory and executes it

        """

        addr = self._hexint(addr)

        self.uploadfile(addr, filename)

        self.execfirmware(addr)

    @command

    def execfirmware(self, addr):

        """

            Executes the firmware at addr

        """

        addr = self._hexint(addr)

        self.logger.info("Running firmware at "+self._hex(addr)+". Bye.")

        self.embios.execfirmware(addr)

    @command

    def aesencrypt(self, addr, size, keyindex):

        """

            Encrypts a buffer using a hardware key

        """

        addr = self._hexint(addr)

        size = self._hexint(size)

        keyindex = self._hexint(keyindex)

        self.embios.aesencrypt(addr, size, keyindex)

    @command

    def aesdecrypt(self, addr, size, keyindex):

        """

            Decrypts a buffer using a hardware key

        """

        addr = self._hexint(addr)

        size = self._hexint(size)

        keyindex = self._hexint(keyindex)

        self.embios.aesdecrypt(addr, size, keyindex)

    @command

    def hmac_sha1(self, addr, size, destination):

        """

            Generates a HMAC-SHA1 hash of the buffer and saves it to 'destination'

        """

        addr = self._hexint(addr)

        size = self._hexint(size)

        destination = self._hexint(destination)

        sha1size = 0x14

        self.logger.info("Generating hmac-sha1 hash from the buffer at "+self._hex(addr)+" with the size "+self._hex(size)+

                         " and saving it to "+self._hex(destination)+" - "+self._hex(destination+sha1size)+"...")

        self.embios.hmac_sha1(addr, size, destination)

        self.logger.info("done\n")

        data = self.embios.read(destination, sha1size)

        hash = ord(data)

        self.logger.info("The generated hash is "+self._hex(hash))

    @command

    def ipodnano2g_getnandinfo(self):

        """

            Target-specific function: ipodnano2g

            Gathers some information about the NAND chip used

        """

        data = self.embios.ipodnano2g_getnandinfo()

        self.logger.info("NAND chip type: "+self._hex(data["type"])+"\n")

        self.logger.info("Number of banks: "+str(data["banks"])+"\n")

        self.logger.info("Number of blocks: "+str(data["blocks"])+"\n")

        self.logger.info("Number of user blocks: "+str(data["userblocks"])+"\n")

        self.logger.info("Pages per block: "+str(data["pagesperblock"]))

    @command

    def ipodnano2g_nandread(self, addr, start, count, doecc, checkempty):

        """

            Target-specific function: ipodnano2g

            Reads data from the NAND chip into memory

        """

        addr = self._hexint(addr)

        start = self._hexint(start)

        count = self._hexint(count)

        doecc = int(doecc)

        checkempty = int(checkempty)

        self.logger.info("Reading "+self._hex(count)+" NAND pages starting at "+self._hex(start)+" to "+self._hex(addr)+"...")

        self.embios.lib.dev.timeout = 30000

        self.embios.ipodnano2g_nandread(addr, start, count, doecc, checkempty)

        self.logger.info("done\n")

    @command

    def ipodnano2g_nandwrite(self, addr, start, count, doecc):

        """

            Target-specific function: ipodnano2g

            Writes data to the NAND chip

        """

        addr = self._hexint(addr)

        start = self._hexint(start)

        count = self._hexint(count)

        doecc = int(doecc)

        self.logger.info("Writing "+self._hex(count)+" NAND pages starting at "+self._hex(start)+" from "+self._hex(addr)+"...")

        self.embios.lib.dev.timeout = 30000

        self.embios.ipodnano2g_nandwrite(addr, start, count, doecc)

        self.logger.info("done\n")

    @command

    def ipodnano2g_nanderase(self, addr, start, count):

        """

            Target-specific function: ipodnano2g

            Erases blocks on the NAND chip and stores the results to memory

        """

        addr = self._hexint(addr)

        start = self._hexint(start)

        count = self._hexint(count)

        self.logger.info("Erasing "+self._hex(count)+" NAND blocks starting at "+self._hex(start)+" and logging to "+self._hex(addr)+"...")

        self.embios.lib.dev.timeout = 30000

        self.embios.ipodnano2g_nanderase(addr, start, count)

        self.logger.info("done\n")

    @command

    def ipodnano2g_dumpnand(self, filenameprefix):

        """

            Target-specific function: ipodnano2g

            Dumps the whole NAND chip to four files

        """

        info = self.embios.ipodnano2g_getnandinfo()

        self.logger.info("Dumping NAND contents...")

        try:

            infofile = open(filenameprefix+"_info.txt", 'wb')

            datafile = open(filenameprefix+"_data.bin", 'wb')

            sparefile = open(filenameprefix+"_spare.bin", 'wb')

            statusfile = open(filenameprefix+"_status.bin", 'wb')

        except IOError:

            raise ArgumentError("Can not open file for writing!")

        infofile.write("NAND chip type: "+self._hex(info["type"])+"\r\n")

        infofile.write("Number of banks: "+str(info["banks"])+"\r\n")

        infofile.write("Number of blocks: "+str(info["blocks"])+"\r\n")

        infofile.write("Number of user blocks: "+str(info["userblocks"])+"\r\n")

        infofile.write("Pages per block: "+str(info["pagesperblock"])+"\r\n")

        self.embios.lib.dev.timeout = 30000

        for i in range(info["banks"] * info["blocks"] * info["pagesperblock"] / 8192):

            self.logger.info(".")

            self.embios.ipodnano2g_nandread(0x08000000, i * 8192, 8192, 1, 1)

            datafile.write(self.embios.read(0x08000000, 0x01000000))

            sparefile.write(self.embios.read(0x09000000, 0x00080000))

            statusfile.write(self.embios.read(0x09080000, 0x00008000))

        infofile.close()

        datafile.close()

        sparefile.close()

        statusfile.close()

        self.logger.info("done\n")

    @command

    def ipodnano2g_wipenand(self, filename, force=False):

        """

            Target-specific function: ipodnano2g

            Wipes the whole NAND chip and logs the result to a file

            <force>: Use this flag to suppress the 5 seconds delay

        """

        self.logger.info("Wiping the whole NAND chip!\n")

        if force == False:

            self.logger.info("If this was not what you intended press Ctrl-C NOW")

            for i in range(10):

                self.logger.info(".")

                time.sleep(1)

            self.logger.info("\n")

        info = self.embios.ipodnano2g_getnandinfo()

        self.logger.info("Wiping NAND contents...")

        try:

            statusfile = open(filename, 'wb')

        except IOError:

            raise ArgumentError("Can not open file for writing!")

        self.embios.lib.dev.timeout = 30000

        for i in range(info["banks"] * info["blocks"] / 64):

            self.logger.info(".")

            self.embios.ipodnano2g_nanderase(0x08000000, i * 64, 64)

            statusfile.write(self.embios.read(0x08000000, 0x00000100))

        statusfile.close()

        self.logger.info("done\n")

if __name__ == "__main__":

    if len(sys.argv) < 2:

        usage("No command specified")

    interface = Commandline()

    interface._parsecommand(sys.argv[1], sys.argv[2:])