--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/Utilities/binplistlib.py Mon Mar 19 20:14:07 2012 +0100
@@ -0,0 +1,967 @@
+# -*- coding: utf-8 -*-
+
+# Copyright (c) 2012 Detlev Offenbach <detlev@die-offenbachs.de>
+#
+
+"""
+Module implementing a library for reading and writing binary property list files.
+
+Binary Property List (plist) files provide a faster and smaller serialization
+format for property lists on OS X. This is a library for generating binary
+plists which can be read by OS X, iOS, or other clients.
+
+The API models the plistlib API, and will call through to plistlib when
+XML serialization or deserialization is required.
+
+To generate plists with UID values, wrap the values with the Uid object. The
+value must be an int.
+
+To generate plists with NSData/CFData values, wrap the values with the
+Data object. The value must be a bytes object.
+
+Date values can only be datetime.datetime objects.
+
+The exceptions InvalidPlistException and NotBinaryPlistException may be
+thrown to indicate that the data cannot be serialized or deserialized as
+a binary plist.
+
+Plist generation example:
+<pre>
+ from binplistlib import *
+ from datetime import datetime
+ plist = {'aKey':'aValue',
+ '0':1.322,
+ 'now':datetime.now(),
+ 'list':[1,2,3],
+ 'tuple':('a','b','c')
+ }
+ try:
+ writePlist(plist, "example.plist")
+ except (InvalidPlistException, NotBinaryPlistException) as e:
+ print("Something bad happened:", e)
+</pre>
+Plist parsing example:
+<pre>
+ from binplistlib import *
+ try:
+ plist = readPlist("example.plist")
+ print(plist)
+ except (InvalidPlistException, NotBinaryPlistException) as e:
+ print("Not a plist:", e)
+</pre>
+"""
+
+#
+# Ported from the Python 2 biplist.py script.
+#
+# Original License:
+#
+# Copyright (c) 2010, Andrew Wooster
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# * Redistributions of source code must retain the above copyright notice,
+# this list of conditions and the following disclaimer.
+# * Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution.
+# * Neither the name of biplist nor the names of its contributors may be
+# used to endorse or promote products derived from this software without
+# specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+
+from collections import namedtuple
+from io import BytesIO
+import calendar
+import datetime
+import math
+import plistlib
+from struct import pack, unpack
+
+__all__ = [
+ 'Uid', 'Data', 'readPlist', 'writePlist', 'readPlistFromBytes',
+ 'writePlistToBytes', 'InvalidPlistException', 'NotBinaryPlistException'
+]
+
+apple_reference_date_offset = 978307200
+
+
+class Uid(int):
+ """
+ Class implementing a wrapper around integers for representing UID values.
+
+ This is used in keyed archiving.
+ """
+ def __repr__(self):
+ return "Uid(%d)" % self
+
+
+class Data(bytes):
+ """
+ Class implementing a wrapper around bytes types for representing Data values.
+ """
+ pass
+
+
+class InvalidPlistException(Exception):
+ """
+ Exception raised when the plist is incorrectly formatted.
+ """
+ pass
+
+
+class NotBinaryPlistException(Exception):
+ """
+ Exception raised when a binary plist was expected but not encountered.
+ """
+ pass
+
+
+def readPlist(pathOrFile):
+ """
+ Module function to read a plist file.
+
+ @param pathOrFile name of the plist file (string) or an open file (file object)
+ @return reference to the read object
+ @exception InvalidPlistException raised to signal an invalid plist file
+ """
+ didOpen = False
+ result = None
+ if isinstance(pathOrFile, str):
+ pathOrFile = open(pathOrFile, 'rb')
+ didOpen = True
+ try:
+ reader = PlistReader(pathOrFile)
+ result = reader.parse()
+ except NotBinaryPlistException as e:
+ try:
+ pathOrFile.seek(0)
+ result = plistlib.readPlist(pathOrFile)
+ except Exception as e:
+ raise InvalidPlistException(e)
+ if didOpen:
+ pathOrFile.close()
+ return result
+
+def writePlist(rootObject, pathOrFile, binary=True):
+ """
+ Module function to write a plist file.
+
+ @param rootObject reference to the object to be written
+ @param pathOrFile name of the plist file (string) or an open file (file object)
+ @param binary flag indicating the generation of a binary plist file (boolean)
+ """
+ if not binary:
+ plistlib.writePlist(rootObject, pathOrFile)
+ return
+ else:
+ didOpen = False
+ if isinstance(pathOrFile, str):
+ pathOrFile = open(pathOrFile, 'wb')
+ didOpen = True
+ writer = PlistWriter(pathOrFile)
+ writer.writeRoot(rootObject)
+ if didOpen:
+ pathOrFile.close()
+ return
+
+def readPlistFromBytes(data):
+ """
+ Module function to read from a plist bytes object.
+
+ @param data plist data (bytes)
+ @return reference to the read object
+ @exception InvalidPlistException raised to signal an invalid plist file
+ """
+ return readPlist(BytesIO(data))
+
+def writePlistToBytes(rootObject, binary=True):
+ """
+ Module function to write a plist bytes object.
+
+ @param rootObject reference to the object to be written
+ @param binary flag indicating the generation of a binary plist bytes object (boolean)
+ """
+ if not binary:
+ return plistlib.writePlistToBytes(rootObject)
+ else:
+ io = BytesIO()
+ writer = PlistWriter(io)
+ writer.writeRoot(rootObject)
+ return io.getvalue()
+
+def is_stream_binary_plist(stream):
+ """
+ Module function to check, if the stream is a binary plist.
+
+ @param stream plist stream (file object)
+ @return flag indicating a binary plist (boolean)
+ """
+ stream.seek(0)
+ header = stream.read(7)
+ if header == b'bplist0':
+ return True
+ else:
+ return False
+
+PlistTrailer = namedtuple('PlistTrailer',
+ 'offsetSize, objectRefSize, offsetCount, topLevelObjectNumber, offsetTableOffset')
+PlistByteCounts = namedtuple('PlistByteCounts',
+ 'nullBytes, boolBytes, intBytes, realBytes, dateBytes, dataBytes, stringBytes, '
+ 'uidBytes, arrayBytes, setBytes, dictBytes')
+
+class PlistReader(object):
+ """
+ Class implementing the plist reader.
+ """
+ file = None
+ contents = b''
+ offsets = None
+ trailer = None
+ currentOffset = 0
+
+ def __init__(self, fileOrStream):
+ """
+ Constructor
+
+ @param fileOrStream open file containing the plist data (file object)
+ """
+ self.reset()
+ self.file = fileOrStream
+
+ def parse(self):
+ """
+ Public method to parse the plist data.
+
+ @return unpickled object
+ """
+ return self.readRoot()
+
+ def reset(self):
+ """
+ Private method to reset the instance object.
+ """
+ self.trailer = None
+ self.contents = b''
+ self.offsets = []
+ self.currentOffset = 0
+
+ def readRoot(self):
+ """
+ Private method to read the root object.
+
+ @return unpickled object
+ """
+ result = None
+ self.reset()
+ # Get the header, make sure it's a valid file.
+ if not is_stream_binary_plist(self.file):
+ raise NotBinaryPlistException()
+ self.file.seek(0)
+ self.contents = self.file.read()
+ if len(self.contents) < 32:
+ raise InvalidPlistException("File is too short.")
+ trailerContents = self.contents[-32:]
+ try:
+ self.trailer = PlistTrailer._make(unpack("!xxxxxxBBQQQ", trailerContents))
+ offset_size = self.trailer.offsetSize * self.trailer.offsetCount
+ offset = self.trailer.offsetTableOffset
+ offset_contents = self.contents[offset:offset+offset_size]
+ offset_i = 0
+ while offset_i < self.trailer.offsetCount:
+ begin = self.trailer.offsetSize*offset_i
+ tmp_contents = offset_contents[begin:begin+self.trailer.offsetSize]
+ tmp_sized = self.getSizedInteger(tmp_contents, self.trailer.offsetSize)
+ self.offsets.append(tmp_sized)
+ offset_i += 1
+ self.setCurrentOffsetToObjectNumber(self.trailer.topLevelObjectNumber)
+ result = self.readObject()
+ except TypeError as e:
+ raise InvalidPlistException(e)
+ return result
+
+ def setCurrentOffsetToObjectNumber(self, objectNumber):
+ """
+ Private method to set the current offset.
+
+ @param objectNumber number of the object (integer)
+ """
+ self.currentOffset = self.offsets[objectNumber]
+
+ def readObject(self):
+ """
+ Private method to read the object data.
+
+ @return unpickled object
+ """
+ result = None
+ tmp_byte = self.contents[self.currentOffset:self.currentOffset+1]
+ marker_byte = unpack("!B", tmp_byte)[0]
+ format = (marker_byte >> 4) & 0x0f
+ extra = marker_byte & 0x0f
+ self.currentOffset += 1
+
+ def proc_extra(extra):
+ if extra == 0b1111:
+ #self.currentOffset += 1
+ extra = self.readObject()
+ return extra
+
+ # bool, null, or fill byte
+ if format == 0b0000:
+ if extra == 0b0000:
+ result = None
+ elif extra == 0b1000:
+ result = False
+ elif extra == 0b1001:
+ result = True
+ elif extra == 0b1111:
+ pass # fill byte
+ else:
+ raise InvalidPlistException(
+ "Invalid object found at offset: {0}".format(self.currentOffset - 1))
+ # int
+ elif format == 0b0001:
+ extra = proc_extra(extra)
+ result = self.readInteger(pow(2, extra))
+ # real
+ elif format == 0b0010:
+ extra = proc_extra(extra)
+ result = self.readReal(extra)
+ # date
+ elif format == 0b0011 and extra == 0b0011:
+ result = self.readDate()
+ # data
+ elif format == 0b0100:
+ extra = proc_extra(extra)
+ result = self.readData(extra)
+ # ascii string
+ elif format == 0b0101:
+ extra = proc_extra(extra)
+ result = self.readAsciiString(extra)
+ # Unicode string
+ elif format == 0b0110:
+ extra = proc_extra(extra)
+ result = self.readUnicode(extra)
+ # uid
+ elif format == 0b1000:
+ result = self.readUid(extra)
+ # array
+ elif format == 0b1010:
+ extra = proc_extra(extra)
+ result = self.readArray(extra)
+ # set
+ elif format == 0b1100:
+ extra = proc_extra(extra)
+ result = set(self.readArray(extra))
+ # dict
+ elif format == 0b1101:
+ extra = proc_extra(extra)
+ result = self.readDict(extra)
+ else:
+ raise InvalidPlistException(
+ "Invalid object found: {{format: {0}, extra: {1}}}".format(
+ bin(format), bin(extra)))
+ return result
+
+ def readInteger(self, bytes):
+ """
+ Private method to read an Integer object.
+
+ @param bytes length of the object (integer)
+ @return integer object
+ """
+ result = 0
+ original_offset = self.currentOffset
+ data = self.contents[self.currentOffset:self.currentOffset+bytes]
+ result = self.getSizedInteger(data, bytes)
+ self.currentOffset = original_offset + bytes
+ return result
+
+ def readReal(self, length):
+ """
+ Private method to read a Real object.
+
+ @param length length of the object (integer)
+ @return float object
+ """
+ result = 0.0
+ to_read = pow(2, length)
+ data = self.contents[self.currentOffset:self.currentOffset+to_read]
+ if length == 2: # 4 bytes
+ result = unpack('>f', data)[0]
+ elif length == 3: # 8 bytes
+ result = unpack('>d', data)[0]
+ else:
+ raise InvalidPlistException(
+ "Unknown real of length {0} bytes".format(to_read))
+ return result
+
+ def readRefs(self, count):
+ """
+ Private method to read References.
+
+ @param count amount of the references (integer)
+ @return list of references (list of integers)
+ """
+ refs = []
+ i = 0
+ while i < count:
+ fragment = self.contents[
+ self.currentOffset:self.currentOffset+self.trailer.objectRefSize]
+ ref = self.getSizedInteger(fragment, len(fragment))
+ refs.append(ref)
+ self.currentOffset += self.trailer.objectRefSize
+ i += 1
+ return refs
+
+ def readArray(self, count):
+ """
+ Private method to read an Array object.
+
+ @param count number of array elements (integer)
+ @return list of unpickled objects
+ """
+ result = []
+ values = self.readRefs(count)
+ i = 0
+ while i < len(values):
+ self.setCurrentOffsetToObjectNumber(values[i])
+ value = self.readObject()
+ result.append(value)
+ i += 1
+ return result
+
+ def readDict(self, count):
+ """
+ Private method to read a Dictionary object.
+
+ @param count number of dictionary elements (integer)
+ @return dictionary of unpickled objects
+ """
+ result = {}
+ keys = self.readRefs(count)
+ values = self.readRefs(count)
+ i = 0
+ while i < len(keys):
+ self.setCurrentOffsetToObjectNumber(keys[i])
+ key = self.readObject()
+ self.setCurrentOffsetToObjectNumber(values[i])
+ value = self.readObject()
+ result[key] = value
+ i += 1
+ return result
+
+ def readAsciiString(self, length):
+ """
+ Private method to read an ASCII encoded string.
+
+ @param length length of the string (integer)
+ @return ASCII encoded string
+ """
+ result = str(unpack("!{0}s".format(length),
+ self.contents[self.currentOffset:self.currentOffset+length])[0],
+ encoding="ascii")
+ self.currentOffset += length
+ return result
+
+ def readUnicode(self, length):
+ """
+ Private method to read an Unicode encoded string.
+
+ @param length length of the string (integer)
+ @return unicode encoded string
+ """
+ actual_length = length*2
+ data = self.contents[self.currentOffset:self.currentOffset+actual_length]
+ # unpack not needed?!! data = unpack(">%ds" % (actual_length), data)[0]
+ self.currentOffset += actual_length
+ return data.decode('utf_16_be')
+
+ def readDate(self):
+ """
+ Private method to read a date.
+
+ @return date object (datetime.datetime)
+ """
+ global apple_reference_date_offset
+ result = unpack(">d", self.contents[self.currentOffset:self.currentOffset+8])[0]
+ result = datetime.datetime.utcfromtimestamp(result + apple_reference_date_offset)
+ self.currentOffset += 8
+ return result
+
+ def readData(self, length):
+ """
+ Private method to read some bytes.
+
+ @param length number of bytes to read (integer)
+ @return Data object
+ """
+ result = self.contents[self.currentOffset:self.currentOffset+length]
+ self.currentOffset += length
+ return Data(result)
+
+ def readUid(self, length):
+ """
+ Private method to read a UID.
+
+ @param length length of the UID (integer)
+ @return Uid object
+ """
+ return Uid(self.readInteger(length+1))
+
+ def getSizedInteger(self, data, bytes):
+ """
+ Private method to read an integer of a specific size.
+
+ @param data data to extract the integer from (bytes)
+ @param bytes length of the integer (integer)
+ """
+ result = 0
+ # 1, 2, and 4 byte integers are unsigned
+ if bytes == 1:
+ result = unpack('>B', data)[0]
+ elif bytes == 2:
+ result = unpack('>H', data)[0]
+ elif bytes == 4:
+ result = unpack('>L', data)[0]
+ elif bytes == 8:
+ result = unpack('>q', data)[0]
+ else:
+ raise InvalidPlistException("Encountered integer longer than 8 bytes.")
+ return result
+
+class HashableWrapper(object):
+ """
+ Class wrapping a hashable value.
+ """
+ def __init__(self, value):
+ self.value = value
+ def __repr__(self):
+ return "<HashableWrapper: %s>" % [self.value]
+
+class BoolWrapper(object):
+ """
+ Class wrapping a boolean value.
+ """
+ def __init__(self, value):
+ self.value = value
+ def __repr__(self):
+ return "<BoolWrapper: %s>" % self.value
+
+class PlistWriter(object):
+ """
+ Class implementing the plist writer.
+ """
+ header = b'bplist00bybiplist1.0'
+ file = None
+ byteCounts = None
+ trailer = None
+ computedUniques = None
+ writtenReferences = None
+ referencePositions = None
+ wrappedTrue = None
+ wrappedFalse = None
+
+ def __init__(self, file):
+ """
+ Constructor
+
+ @param file file to write the plist data to (file object)
+ """
+ self.reset()
+ self.file = file
+ self.wrappedTrue = BoolWrapper(True)
+ self.wrappedFalse = BoolWrapper(False)
+
+ def reset(self):
+ """
+ Private method to reset the instance object.
+ """
+ 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):
+ """
+ Private method to get the position of an object.
+
+ If the given object has been written already, return its
+ position in the offset table. Otherwise, return None.
+
+ @return position of the object (integer)
+ """
+ return self.writtenReferences.get(obj)
+
+ def writeRoot(self, root):
+ """
+ Public method to write an object to a plist file.
+
+ Strategy is:
+ <ul>
+ <li>write header</li>
+ <li>wrap root object so everything is hashable</li>
+ <li>compute size of objects which will be written
+ <ul>
+ <li>need to do this in order to know how large the object refs
+ will be in the list/dict/set reference lists</li>
+ </ul></li>
+ <li>write objects
+ <ul>
+ <li>keep objects in writtenReferences</li>
+ <li>keep positions of object references in referencePositions</li>
+ <li>write object references with the length computed previously</li>
+ </ul></li>
+ <li>computer object reference length</li>
+ <li>write object reference positions</li>
+ <li>write trailer</li>
+ </ul>
+
+ @param root reference to the object to be written
+ """
+ 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):
+ """
+ Private method to generate object wrappers.
+
+ @param root object to be wrapped
+ @return wrapped object
+ """
+ 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 root.items():
+ 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, str):
+ 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, int):
+ 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, str):
+ 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:
+ self.computeOffsets(value, asReference=True)
+ elif isinstance(obj, dict):
+ size = proc_size(len(obj))
+ self.incrementByteCount('dictBytes', incr=1+size)
+ for key, value in obj.items():
+ check_key(key)
+ self.computeOffsets(key, asReference=True)
+ self.computeOffsets(value, asReference=True)
+ else:
+ raise InvalidPlistException("Unknown object type.")
+
+ def writeObjectReference(self, obj, output):
+ """
+ Private method to write an object reference.
+
+ 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.
+
+ @param obj object to be written
+ @param output output stream to append the object to
+ @return flag indicating a new reference 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):
+ """
+ Private method to serialize the given object to the output.
+
+ @param obj object to be serialized
+ @param output output to be serialized to (bytes)
+ @param setReferencePosition flag indicating, that the reference
+ position the object was written to shall be recorded (boolean)
+ @return new output
+ """
+ def proc_variable_length(format, length):
+ result = ''
+ if length > 0b1110:
+ result += pack('!B', (format << 4) | 0b1111)
+ result = self.writeObject(length, result)
+ else:
+ result += pack('!B', (format << 4) | length)
+ return result
+
+ 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, int):
+ 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, str):
+ # Python 3 uses unicode strings only
+ bytes = obj.encode('utf_16_be')
+ output += proc_variable_length(0b0110, len(bytes)/2)
+ 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 obj.items():
+ 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):
+ """
+ Private method to write all of the object reference offsets.
+
+ @param output current output (bytes)
+ @return new output (bytes)
+ """
+ all_positions = []
+ writtenReferences = list(self.writtenReferences.items())
+ writtenReferences.sort(key=lambda x: x[1])
+ for obj,order in writtenReferences:
+ position = self.referencePositions.get(obj)
+ if position is None:
+ raise InvalidPlistException(
+ "Error while writing offsets table. Object not found. {0}"
+ .format(obj))
+ output += self.binaryInt(position, self.trailer.offsetSize)
+ all_positions.append(position)
+ return output
+
+ def binaryReal(self, obj):
+ """
+ Private method to pack a real object.
+
+ @param obj real to be packed
+ @return serialized object (bytes)
+ """
+ # just use doubles
+ result = pack('>d', obj)
+ return result
+
+ def binaryInt(self, obj, bytes=None):
+ """
+ Private method to pack an integer object.
+
+ @param obj integer to be packed
+ @param bytes length the integer should be packed into (integer)
+ @return serialized object (bytes)
+ """
+ result = ''
+ 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):
+ """
+ Private method to determine the number of bytes necessary to store the
+ given integer.
+
+ @param obj integer object
+ @return number of bytes required (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):
+ """
+ Private method to determine the number of bytes necessary to store the
+ given real.
+
+ @param obj real object
+ @return number of bytes required (integer)
+ """
+ return 8
