def test_cffolder_add_data(self):
reserve = {'cbCFHeader': 0, 'cbCFFolder': 0, 'cbCFData': 0}
cfheader = CFHEADER(flags=0, reserve=reserve)
cffolder = CFFOLDER(cfheader=cfheader)
cfdata = CFDATA(data="testdata1")
cffolder.add_data(cfdata)
cfdata = CFDATA(data="testdata2")
cffolder.add_data(cfdata)
self.assertEquals(2, cffolder.cCFData)
def test_cfdata_normal_creation(self):
data = "this is the data"
cfdata = CFDATA(data=data)
self.assertEquals(data, cfdata.ab)
self.assertEquals(len(data), cfdata.cbData)
self.assertEquals(len(data), cfdata.cbUncomp)
self.assertEquals(len(cfdata), len(repr(cfdata)))
def test_cfdata_with_reserve(self):
data = "this is the data"
reserve = {'cbCFHeader': 0, 'cbCFFolder': 0, 'cbCFData': 20}
cfheader = CFHEADER(flags=CFHEADER.cfhdrRESERVE_PRESENT,
reserve=reserve)
cffolder = CFFOLDER(cfheader=cfheader)
cfdata = CFDATA(cffolder=cffolder, data=data)
self.assertEquals(20, len(cfdata.abReserve))
self.assertEquals(len(cfdata), len(repr(cfdata)))
def add_file(self, folder_name, filename, total_len, data):
if self.size == self.max_data:
raise CABException("This cab is full")
if (self.size + len(data)) <= self.max_data:
try:
cffolder = next(_ for _ in self.cffolder_list
if _.name == folder_name)
# We need to check if the cffolder has a cffile scattered that continues from a PREV
# If this is the case, we need to provide a new cffolder anyways.. this is how it works
cffolder = self._check_for_scattered_prev_cffile(cffolder)
except StopIteration:
cffolder = self._create_cffolder(folder_name)
self.cffolder_list.append(cffolder)
cffile = CFFILE(cffolder=cffolder,
total_len=total_len,
filename=filename)
self.cffile_list.append(cffile)
# Max data per CFDATA is 0x8000 -> This is an empirical result
if len(data) > 0x8000:
data_chunks = [
data[i:i + 0x8000] for i in range(0, len(data), 0x8000)
]
for data_chunk in data_chunks:
cfdata = CFDATA(cffolder=cffolder, data=data_chunk)
self.cfdata_list.append(cfdata)
cffolder.add_data(cfdata)
else:
cfdata = CFDATA(cffolder=cffolder, data=data)
self.cfdata_list.append(cfdata)
# Update cCFData
cffolder.add_data(cfdata)
cffolder.add_file(cffile)
self.update_fields()
self.size += len(data)
else:
raise CABException("The cab hasn't enough space for the data ")
def _read_data_primitive(self, current_cab, cffile):
file_data = ""
file_data_len = self.file_data_len
while file_data_len < cffile.cbFile and self.curr_index_data < len(current_cab.cfdata_list):
current_cfdata = current_cab.cfdata_list[self.curr_index_data]
file_data_len += current_cfdata.cbUncomp
file_data += current_cfdata.ab
self.curr_index_data += 1
self.file_data_len = file_data_len
if self.file_data_len > cffile.cbFile:
# The CAB compressor of windows does a nasty thing...
# It allows to share a CFDATA between TWO CFFILES
# We need to adjust the data if this is the case
difference = self.file_data_len - cffile.cbFile
real_file_data = file_data[0:(self.file_data_len-difference)]
# We will create an anonymous CFDATA and add it to the list ..
# This way the remaining bytes that belongs to the next CFFILE will be read transparently
new_cfdata = CFDATA()
new_cfdata.ab = file_data[(self.file_data_len-difference):self.file_data_len]
new_cfdata.cbUncomp = len(new_cfdata.ab)
new_cfdata.cbData = len(new_cfdata.ab)
current_cab.cfdata_list.insert(self.curr_index_data, new_cfdata)
return real_file_data
return file_data
def _read_data_primitive(self, current_cab, cffile):
file_data = ""
file_data_len = self.file_data_len
while file_data_len < cffile.cbFile and self.curr_index_data < len(current_cab.cfdata_list):
current_cfdata = current_cab.cfdata_list[self.curr_index_data]
file_data_len += current_cfdata.cbUncomp
file_data += current_cfdata.ab
self.curr_index_data += 1
self.file_data_len = file_data_len
if self.file_data_len > cffile.cbFile:
# The CAB compressor of windows does a nasty thing...
# It allows to share a CFDATA between TWO CFFILES
# We need to adjust the data if this is the case
difference = self.file_data_len - cffile.cbFile
real_file_data = file_data[0:(self.file_data_len-difference)]
# We will create an anonymous CFDATA and add it to the list ..
# This way the remaining bytes that belongs to the next CFFILE will be read transparently
new_cfdata = CFDATA()
new_cfdata.ab = file_data[(self.file_data_len-difference):self.file_data_len]
new_cfdata.cbUncomp = len(new_cfdata.ab)
new_cfdata.cbData = len(new_cfdata.ab)
current_cab.cfdata_list.insert(self.curr_index_data, new_cfdata)
return real_file_data
return file_data
def read_data(self, handle):
result = []
data_count = sum([cffolder.cCFData for cffolder in self.cffolder_list])
for i in range(data_count):
parameters = {}
parameters["csum"] = self._read_dword(handle)
parameters["cbData"] = self._read_word(handle)
parameters["cbUncomp"] = self._read_word(handle)
if self.cfheader.flags & CFHEADER.cfhdrRESERVE_PRESENT:
parameters["abReserve"] = handle.read(self.cfheader.cbCFData)
else:
parameters["abReserve"] = ""
parameters["ab"] = handle.read(parameters["cbData"])
result.append(CFDATA.create_from_parameters(parameters=parameters))
return result