def is_stream_binary_plist(stream):
stream.seek(0)
header = stream.read(7)
if header == six.b('bplist0'):
return True
else:
return False
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
def binaryInt(self, obj, bytes=None):
result = six.b('')
if bytes is None:
bytes = self.intSize(obj)
if bytes == 1:
result += pack('>B', obj)
elif bytes == 2:
result += pack('>H', obj)
elif bytes == 4:
result += pack('>L', obj)
elif bytes == 8:
result += pack('>q', obj)
else:
raise InvalidPlistException("Core Foundation can't handle integers with size greater than 8 bytes.")
return result
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
class PlistWriter(object):
header = six.b('bplist00bybiplist1.0')
file = None
byteCounts = None
trailer = None
computedUniques = None
writtenReferences = None
referencePositions = None
wrappedTrue = None
wrappedFalse = None
def __init__(self, file):
self.reset()
self.file = file
self.wrappedTrue = BoolWrapper(True)
self.wrappedFalse = BoolWrapper(False)
def reset(self):
self.byteCounts = PlistByteCounts(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
self.trailer = PlistTrailer(0, 0, 0, 0, 0)
# A set of all the uniques which have been computed.
self.computedUniques = set()
# A list of all the uniques which have been written.
self.writtenReferences = {}
# A dict of the positions of the written uniques.
self.referencePositions = {}
def positionOfObjectReference(self, obj):
"""If the given object has been written already, return its
position in the offset table. Otherwise, return None."""
return self.writtenReferences.get(obj)
def writeRoot(self, root):
"""
Strategy is:
- write header
- wrap root object so everything is hashable
- compute size of objects which will be written
- need to do this in order to know how large the object refs
will be in the list/dict/set reference lists
- write objects
- keep objects in writtenReferences
- keep positions of object references in referencePositions
- write object references with the length computed previously
- computer object reference length
- write object reference positions
- write trailer
"""
output = self.header
wrapped_root = self.wrapRoot(root)
should_reference_root = True#not isinstance(wrapped_root, HashableWrapper)
self.computeOffsets(wrapped_root, asReference=should_reference_root, isRoot=True)
self.trailer = self.trailer._replace(**{'objectRefSize':self.intSize(len(self.computedUniques))})
(_, output) = self.writeObjectReference(wrapped_root, output)
output = self.writeObject(wrapped_root, output, setReferencePosition=True)
# output size at this point is an upper bound on how big the
# object reference offsets need to be.
self.trailer = self.trailer._replace(**{
'offsetSize':self.intSize(len(output)),
'offsetCount':len(self.computedUniques),
'offsetTableOffset':len(output),
'topLevelObjectNumber':0
})
output = self.writeOffsetTable(output)
output += pack('!xxxxxxBBQQQ', *self.trailer)
self.file.write(output)
def wrapRoot(self, root):
if isinstance(root, bool):
if root is True:
return self.wrappedTrue
else:
return self.wrappedFalse
elif isinstance(root, set):
n = set()
for value in root:
n.add(self.wrapRoot(value))
return HashableWrapper(n)
elif isinstance(root, dict):
n = {}
for key, value in six.iteritems(root):
n[self.wrapRoot(key)] = self.wrapRoot(value)
return HashableWrapper(n)
elif isinstance(root, list):
n = []
for value in root:
n.append(self.wrapRoot(value))
return HashableWrapper(n)
elif isinstance(root, tuple):
n = tuple([self.wrapRoot(value) for value in root])
return HashableWrapper(n)
else:
return root
def incrementByteCount(self, field, incr=1):
self.byteCounts = self.byteCounts._replace(**{field:self.byteCounts.__getattribute__(field) + incr})
def computeOffsets(self, obj, asReference=False, isRoot=False):
def check_key(key):
if key is None:
raise InvalidPlistException('Dictionary keys cannot be null in plists.')
elif isinstance(key, Data):
raise InvalidPlistException('Data cannot be dictionary keys in plists.')
elif not isinstance(key, (six.binary_type, six.text_type)):
raise InvalidPlistException('Keys must be strings.')
def proc_size(size):
if size > 0b1110:
size += self.intSize(size)
return size
# If this should be a reference, then we keep a record of it in the
# uniques table.
if asReference:
if obj in self.computedUniques:
return
else:
self.computedUniques.add(obj)
if obj is None:
self.incrementByteCount('nullBytes')
elif isinstance(obj, BoolWrapper):
self.incrementByteCount('boolBytes')
elif isinstance(obj, Uid):
size = self.intSize(obj)
self.incrementByteCount('uidBytes', incr=1+size)
elif isinstance(obj, six.integer_types):
size = self.intSize(obj)
self.incrementByteCount('intBytes', incr=1+size)
elif isinstance(obj, (float)):
size = self.realSize(obj)
self.incrementByteCount('realBytes', incr=1+size)
elif isinstance(obj, datetime.datetime):
self.incrementByteCount('dateBytes', incr=2)
elif isinstance(obj, Data):
size = proc_size(len(obj))
self.incrementByteCount('dataBytes', incr=1+size)
elif isinstance(obj, (six.text_type, six.binary_type)):
size = proc_size(len(obj))
self.incrementByteCount('stringBytes', incr=1+size)
elif isinstance(obj, HashableWrapper):
obj = obj.value
if isinstance(obj, set):
size = proc_size(len(obj))
self.incrementByteCount('setBytes', incr=1+size)
for value in obj:
self.computeOffsets(value, asReference=True)
elif isinstance(obj, (list, tuple)):
size = proc_size(len(obj))
self.incrementByteCount('arrayBytes', incr=1+size)
for value in obj:
asRef = True
self.computeOffsets(value, asReference=True)
elif isinstance(obj, dict):
size = proc_size(len(obj))
self.incrementByteCount('dictBytes', incr=1+size)
for key, value in six.iteritems(obj):
check_key(key)
self.computeOffsets(key, asReference=True)
self.computeOffsets(value, asReference=True)
else:
raise InvalidPlistException("Unknown object type.")
def writeObjectReference(self, obj, output):
"""Tries to write an object reference, adding it to the references
table. Does not write the actual object bytes or set the reference
position. Returns a tuple of whether the object was a new reference
(True if it was, False if it already was in the reference table)
and the new output.
"""
position = self.positionOfObjectReference(obj)
if position is None:
self.writtenReferences[obj] = len(self.writtenReferences)
output += self.binaryInt(len(self.writtenReferences) - 1, bytes=self.trailer.objectRefSize)
return (True, output)
else:
output += self.binaryInt(position, bytes=self.trailer.objectRefSize)
return (False, 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
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 binaryReal(self, obj):
# just use doubles
result = pack('>d', obj)
return result
def binaryInt(self, obj, bytes=None):
result = six.b('')
if bytes is None:
bytes = self.intSize(obj)
if bytes == 1:
result += pack('>B', obj)
elif bytes == 2:
result += pack('>H', obj)
elif bytes == 4:
result += pack('>L', obj)
elif bytes == 8:
result += pack('>q', obj)
else:
raise InvalidPlistException("Core Foundation can't handle integers with size greater than 8 bytes.")
return result
def intSize(self, obj):
"""Returns the number of bytes necessary to store the given integer."""
# SIGNED
if obj < 0: # Signed integer, always 8 bytes
return 8
# UNSIGNED
elif obj <= 0xFF: # 1 byte
return 1
elif obj <= 0xFFFF: # 2 bytes
return 2
elif obj <= 0xFFFFFFFF: # 4 bytes
return 4
# SIGNED
# 0x7FFFFFFFFFFFFFFF is the max.
elif obj <= 0x7FFFFFFFFFFFFFFF: # 8 bytes
return 8
else:
raise InvalidPlistException("Core Foundation can't handle integers with size greater than 8 bytes.")
def realSize(self, obj):
return 8
