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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:
# pad image to 8 bytes (needed at least for L476)
pad = (8 - len(image["data"]) % 8) % 8
image["data"] = image["data"] + bytes(bytearray(8)[0:pad])
#
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)
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