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#!/usr/bin/python
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# Written by Antonio Galea - 2010/11/18
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# Distributed under Gnu LGPL 3.0
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# see http://www.gnu.org/licenses/lgpl-3.0.txt
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import sys,struct,zlib,os
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from optparse import OptionParser
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DEFAULT_DEVICE="0x0483:0xdf11"
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def named(tuple,names):
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return dict(zip(names.split(),tuple))
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def consume(fmt,data,names):
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n = struct.calcsize(fmt)
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return named(struct.unpack(fmt,data[:n]),names),data[n:]
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def cstring(string):
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return string.split('\0',1)[0]
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def compute_crc(data):
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return 0xFFFFFFFF & -zlib.crc32(data) -1
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def parse(file,dump_images=False):
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print 'File: "%s"' % file
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data = open(file,'rb').read()
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crc = compute_crc(data[:-4])
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prefix, data = consume('<5sBIB',data,'signature version size targets')
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print '%(signature)s v%(version)d, image size: %(size)d, targets: %(targets)d' % prefix
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for t in range(prefix['targets']):
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tprefix, data = consume('<6sBI255s2I',data,'signature altsetting named name size elements')
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tprefix['num'] = t
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if tprefix['named']:
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tprefix['name'] = cstring(tprefix['name'])
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else:
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tprefix['name'] = ''
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print '%(signature)s %(num)d, alt setting: %(altsetting)s, name: "%(name)s", size: %(size)d, elements: %(elements)d' % tprefix
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tsize = tprefix['size']
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target, data = data[:tsize], data[tsize:]
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for e in range(tprefix['elements']):
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eprefix, target = consume('<2I',target,'address size')
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eprefix['num'] = e
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print ' %(num)d, address: 0x%(address)08x, size: %(size)d' % eprefix
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esize = eprefix['size']
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image, target = target[:esize], target[esize:]
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if dump_images:
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out = '%s.target%d.image%d.bin' % (file,t,e)
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open(out,'wb').write(image)
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print ' DUMPED IMAGE TO "%s"' % out
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if len(target):
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print "target %d: PARSE ERROR" % t
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suffix = named(struct.unpack('<4H3sBI',data[:16]),'device product vendor dfu ufd len crc')
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print 'usb: %(vendor)04x:%(product)04x, device: 0x%(device)04x, dfu: 0x%(dfu)04x, %(ufd)s, %(len)d, 0x%(crc)08x' % suffix
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if crc != suffix['crc']:
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print "CRC ERROR: computed crc32 is 0x%08x" % crc
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data = data[16:]
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if data:
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print "PARSE ERROR"
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def build(file,targets,device=DEFAULT_DEVICE):
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data = ''
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for t,target in enumerate(targets):
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tdata = ''
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for image in target:
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tdata += struct.pack('<2I',image['address'],len(image['data']))+image['data']
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tdata = struct.pack('<6sBI255s2I','Target',0,1,'ST...',len(tdata),len(target)) + tdata
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data += tdata
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data = struct.pack('<5sBIB','DfuSe',1,len(data)+11,len(targets)) + data
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v,d=map(lambda x: int(x,0) & 0xFFFF, device.split(':',1))
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data += struct.pack('<4H3sB',0,d,v,0x011a,'UFD',16)
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crc = compute_crc(data)
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data += struct.pack('<I',crc)
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open(file,'wb').write(data)
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if __name__=="__main__":
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usage = """
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%prog [-d|--dump] infile.dfu
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%prog {-b|--build} address:file.bin [-b address:file.bin ...] [{-D|--device}=vendor:device] outfile.dfu"""
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parser = OptionParser(usage=usage)
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parser.add_option("-b", "--build", action="append", dest="binfiles",
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help="build a DFU file from given BINFILES", metavar="BINFILES")
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parser.add_option("-D", "--device", action="store", dest="device",
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help="build for DEVICE, defaults to %s" % DEFAULT_DEVICE, metavar="DEVICE")
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parser.add_option("-d", "--dump", action="store_true", dest="dump_images",
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default=False, help="dump contained images to current directory")
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(options, args) = parser.parse_args()
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if options.binfiles and len(args)==1:
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target = []
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for arg in options.binfiles:
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try:
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address,binfile = arg.split(':',1)
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except ValueError:
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print "Address:file couple '%s' invalid." % arg
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sys.exit(1)
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try:
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address = int(address,0) & 0xFFFFFFFF
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except ValueError:
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print "Address %s invalid." % address
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sys.exit(1)
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if not os.path.isfile(binfile):
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print "Unreadable file '%s'." % binfile
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sys.exit(1)
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target.append({ 'address': address, 'data': open(binfile,'rb').read() })
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outfile = args[0]
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device = DEFAULT_DEVICE
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if options.device:
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device=options.device
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try:
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v,d=map(lambda x: int(x,0) & 0xFFFF, device.split(':',1))
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except:
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print "Invalid device '%s'." % device
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sys.exit(1)
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build(outfile,[target],device)
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elif len(args)==1:
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infile = args[0]
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if not os.path.isfile(infile):
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print "Unreadable file '%s'." % infile
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sys.exit(1)
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parse(infile, dump_images=options.dump_images)
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else:
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parser.print_help()
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sys.exit(1)
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