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 parse-bytecode

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#!/usr/bin/python

# Written by Antonio Galea - 2010/11/18

# Distributed under Gnu LGPL 3.0

# see http://www.gnu.org/licenses/lgpl-3.0.txt

import sys,struct,zlib,os

from optparse import OptionParser

DEFAULT_DEVICE="0x0483:0xdf11"

def named(tuple,names):

return dict(zip(names.split(),tuple))

def consume(fmt,data,names):

n = struct.calcsize(fmt)

return named(struct.unpack(fmt,data[:n]),names),data[n:]

def cstring(string):

return string.split('\0',1)[0]

def compute_crc(data):

return 0xFFFFFFFF & -zlib.crc32(data) -1

def parse(file,dump_images=False):

print ('File: "%s"' % file)

data = open(file,'rb').read()

crc = compute_crc(data[:-4])

prefix, data = consume('<5sBIB',data,'signature version size targets')

print ('%(signature)s v%(version)d, image size: %(size)d, targets: %(targets)d' % prefix)

for t in range(prefix['targets']):

tprefix, data = consume('<6sBI255s2I',data,'signature altsetting named name size elements')

tprefix['num'] = t

if tprefix['named']:

tprefix['name'] = cstring(tprefix['name'])

else:

tprefix['name'] = ''

print ('%(signature)s %(num)d, alt setting: %(altsetting)s, name: "%(name)s", size: %(size)d, elements: %(elements)d' % tprefix)

tsize = tprefix['size']

target, data = data[:tsize], data[tsize:]

for e in range(tprefix['elements']):

eprefix, target = consume('<2I',target,'address size')

eprefix['num'] = e

print (' %(num)d, address: 0x%(address)08x, size: %(size)d' % eprefix)

esize = eprefix['size']

image, target = target[:esize], target[esize:]

if dump_images:

out = '%s.target%d.image%d.bin' % (file,t,e)

open(out,'wb').write(image)

print (' DUMPED IMAGE TO "%s"' % out)

if len(target):

print ("target %d: PARSE ERROR" % t)

suffix = named(struct.unpack('<4H3sBI',data[:16]),'device product vendor dfu ufd len crc')

print ('usb: %(vendor)04x:%(product)04x, device: 0x%(device)04x, dfu: 0x%(dfu)04x, %(ufd)s, %(len)d, 0x%(crc)08x' % suffix)

if crc != suffix['crc']:

print ("CRC ERROR: computed crc32 is 0x%08x" % crc)

data = data[16:]

if data:

print ("PARSE ERROR")

def build(file,targets,device=DEFAULT_DEVICE):

data = b''

for t,target in enumerate(targets):

tdata = b''

for image in target:

tdata += struct.pack('<2I',image['address'],len(image['data']))+image['data']

tdata = struct.pack('<6sBI255s2I',b'Target',0,1, b'ST...',len(tdata),len(target)) + tdata

data += tdata

data = struct.pack('<5sBIB',b'DfuSe',1,len(data)+11,len(targets)) + data

v,d=map(lambda x: int(x,0) & 0xFFFF, device.split(':',1))

data += struct.pack('<4H3sB',0,d,v,0x011a,b'UFD',16)

crc = compute_crc(data)

data += struct.pack('<I',crc)

open(file,'wb').write(data)

if __name__=="__main__":

usage = """

%prog [-d|--dump] infile.dfu

%prog {-b|--build} address:file.bin [-b address:file.bin ...] [{-D|--device}=vendor:device] outfile.dfu"""

parser = OptionParser(usage=usage)

parser.add_option("-b", "--build", action="append", dest="binfiles",

help="build a DFU file from given BINFILES", metavar="BINFILES")

parser.add_option("-D", "--device", action="store", dest="device",

help="build for DEVICE, defaults to %s" % DEFAULT_DEVICE, metavar="DEVICE")

parser.add_option("-d", "--dump", action="store_true", dest="dump_images",

default=False, help="dump contained images to current directory")

(options, args) = parser.parse_args()

if options.binfiles and len(args)==1:

target = []

for arg in options.binfiles:

try:

address,binfile = arg.split(':',1)

except ValueError:

print ("Address:file couple '%s' invalid." % arg)

sys.exit(1)

try:

address = int(address,0) & 0xFFFFFFFF

except ValueError:

print ("Address %s invalid." % address)

sys.exit(1)

if not os.path.isfile(binfile):

print ("Unreadable file '%s'." % binfile)

sys.exit(1)

target.append({ 'address': address, 'data': open(binfile,'rb').read() })

outfile = args[0]

device = DEFAULT_DEVICE

if options.device:

device=options.device

try:

v,d=map(lambda x: int(x,0) & 0xFFFF, device.split(':',1))

except:

print ("Invalid device '%s'." % device)

sys.exit(1)

build(outfile,[target],device)

elif len(args)==1:

infile = args[0]

if not os.path.isfile(infile):

print ("Unreadable file '%s'." % infile)

sys.exit(1)

parse(infile, dump_images=options.dump_images)

else:

parser.print_help()

sys.exit(1)