def _fixLastField(self):
"""
Try to fix last field when we know current field set size.
Returns new added field if any, or None.
"""
assert self._size is not None
# Stop parser
message = ["stop parser"]
self._field_generator = None
# If last field is too big, delete it
while self._size < self._current_size:
field = self._deleteField(len(self._fields) - 1)
message.append("delete field %s" % field.path)
assert self._current_size <= self._size
blocks = [(x.absolute_address, x.size) for x in self._fields]
fields = []
for start, length in getgaps(self.absolute_address, self._size, blocks):
self.seekBit(start, relative=False)
field = createRawField(self, length, "unparsed[]")
self.setUniqueFieldName(field)
self._fields.append(field.name, field)
fields.append(field)
message.append("found unparsed segment: start %s, length %s" % (start, length))
self.seekBit(self._size, relative=False)
message = ", ".join(message)
if fields:
self.warning("[Autofix] Fix parser error: " + message)
return fields
def _fixLastField(self):
"""
Try to fix last field when we know current field set size.
Returns new added field if any, or None.
"""
assert self._size is not None
# Stop parser
message = ["stop parser"]
self._field_generator = None
# If last field is too big, delete it
while self._size < self._current_size:
field = self._deleteField(len(self._fields) - 1)
message.append("delete field %s" % field.path)
assert self._current_size <= self._size
blocks = [(x.absolute_address, x.size) for x in self._fields]
fields = []
for start, length in getgaps(self.absolute_address, self._size,
blocks):
self.seekBit(start, relative=False)
field = createRawField(self, length, "unparsed[]")
self.setUniqueFieldName(field)
self._fields.append(field.name, field)
fields.append(field)
message.append("found unparsed segment: start %s, length %s" %
(start, length))
self.seekBit(self._size, relative=False)
message = ", ".join(message)
if fields:
self.warning("[Autofix] Fix parser error: " + message)
return fields
def _fixLastField(self):
"""
Try to fix last field when we know current field set size.
Returns new added field if any, or None.
"""
assert self._size is not None
# Stop parser
message = ["stop parser"]
self._field_generator = None
# If last field is too big, delete it
while self._size < self._current_size:
field = self._deleteField(len(self._fields) - 1)
message.append("delete field %s" % field.path)
assert self._current_size <= self._size
# If field size current is smaller: add a raw field
size = self._size - self._current_size
if size:
field = createRawField(self, size, "raw[]")
message.append("add padding")
self._current_size += field.size
self._fields.append(field._name, field)
else:
field = None
message = ", ".join(message)
self.warning("[Autofix] Fix parser error: " + message)
assert self._current_size == self._size
return field
def _fixLastField(self):
"""
Try to fix last field when we know current field set size.
Returns new added field if any, or None.
"""
assert self._size is not None
# Stop parser
message = ["stop parser"]
self._field_generator = None
# If last field is too big, delete it
while self._size < self._current_size:
field = self._deleteField(len(self._fields)-1)
message.append("delete field %s" % field.path)
assert self._current_size <= self._size
# If field size current is smaller: add a raw field
size = self._size - self._current_size
if size:
field = createRawField(self, size, "raw[]")
message.append("add padding")
self._current_size += field.size
self._fields.append(field._name, field)
else:
field = None
message = ", ".join(message)
self.warning("[Autofix] Fix parser error: " + message)
assert self._current_size == self._size
return field
def _truncate(self, size):
assert size > 0
if size < self._current_size:
self._size = size
while True:
field = self._fields.values[-1]
if field._address < size:
break
del self._fields[-1]
self._current_size = field._address
size -= field._address
if size < field._size:
if field.is_field_set:
field._truncate(size)
else:
del self._fields[-1]
field = createRawField(self, size, "raw[]")
self._fields.append(field._name, field)
self._current_size = self._size
else:
assert size < self._size or self._size is None
self._size = size
if self._size == self._current_size:
self._field_generator = None
def _truncate(self, size):
assert size > 0
if size < self._current_size:
self._size = size
while True:
field = self._fields.values[-1]
if field._address < size:
break
del self._fields[-1]
self._current_size = field._address
size -= field._address
if size < field._size:
if field.is_field_set:
field._truncate(size)
else:
del self._fields[-1]
field = createRawField(self, size, "raw[]")
self._fields.append(field._name, field)
self._current_size = self._size
else:
assert size < self._size or self._size is None
self._size = size
if self._size == self._current_size:
self._field_generator = None
