def writeOffsetTable(self, output):
"""Writes all of the object reference offsets."""
all_positions = []
writtenReferences = list(self.writtenReferences.items())
writtenReferences.sort(key=lambda x: x[1])
for obj,order in writtenReferences:
# Porting note: Elsewhere we deliberately replace empty unicdoe strings
# with empty binary strings, but the empty unicode string
# goes into writtenReferences. This isn't an issue in Py2
# because u'' and b'' have the same hash; but it is in
# Py3, where they don't.
if six.PY3 and obj == six.u(''):
obj = six.b('')
position = self.referencePositions.get(obj)
if position is None:
raise InvalidPlistException("Error while writing offsets table. Object not found. %s" % obj)
output += self.binaryInt(position, self.trailer.offsetSize)
all_positions.append(position)
return output
def writeObject(self, obj, output, setReferencePosition=False):
"""Serializes the given object to the output. Returns output.
If setReferencePosition is True, will set the position the
object was written.
"""
def proc_variable_length(format, length):
result = six.b('')
if length > 0b1110:
result += pack('!B', (format << 4) | 0b1111)
result = self.writeObject(length, result)
else:
result += pack('!B', (format << 4) | length)
return result
if isinstance(obj, six.text_type) and obj == six.u(''):
# The Apple Plist decoder can't decode a zero length Unicode string.
obj = six.b('')
if setReferencePosition:
self.referencePositions[obj] = len(output)
if obj is None:
output += pack('!B', 0b00000000)
elif isinstance(obj, BoolWrapper):
if obj.value is False:
output += pack('!B', 0b00001000)
else:
output += pack('!B', 0b00001001)
elif isinstance(obj, Uid):
size = self.intSize(obj)
output += pack('!B', (0b1000 << 4) | size - 1)
output += self.binaryInt(obj)
elif isinstance(obj, six.integer_types):
bytes = self.intSize(obj)
root = math.log(bytes, 2)
output += pack('!B', (0b0001 << 4) | int(root))
output += self.binaryInt(obj)
elif isinstance(obj, float):
# just use doubles
output += pack('!B', (0b0010 << 4) | 3)
output += self.binaryReal(obj)
elif isinstance(obj, datetime.datetime):
timestamp = calendar.timegm(obj.utctimetuple())
timestamp -= apple_reference_date_offset
output += pack('!B', 0b00110011)
output += pack('!d', float(timestamp))
elif isinstance(obj, Data):
output += proc_variable_length(0b0100, len(obj))
output += obj
elif isinstance(obj, six.text_type):
bytes = obj.encode('utf_16_be')
output += proc_variable_length(0b0110, len(bytes)//2)
output += bytes
elif isinstance(obj, six.binary_type):
bytes = obj
output += proc_variable_length(0b0101, len(bytes))
output += bytes
elif isinstance(obj, HashableWrapper):
obj = obj.value
if isinstance(obj, (set, list, tuple)):
if isinstance(obj, set):
output += proc_variable_length(0b1100, len(obj))
else:
output += proc_variable_length(0b1010, len(obj))
objectsToWrite = []
for objRef in obj:
(isNew, output) = self.writeObjectReference(objRef, output)
if isNew:
objectsToWrite.append(objRef)
for objRef in objectsToWrite:
output = self.writeObject(objRef, output, setReferencePosition=True)
elif isinstance(obj, dict):
output += proc_variable_length(0b1101, len(obj))
keys = []
values = []
objectsToWrite = []
for key, value in six.iteritems(obj):
keys.append(key)
values.append(value)
for key in keys:
(isNew, output) = self.writeObjectReference(key, output)
if isNew:
objectsToWrite.append(key)
for value in values:
(isNew, output) = self.writeObjectReference(value, output)
if isNew:
objectsToWrite.append(value)
for objRef in objectsToWrite:
output = self.writeObject(objRef, output, setReferencePosition=True)
return output
