mirror of
https://github.com/python/cpython.git
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08398631a0
This fixes a divergence between the Python and C implementations of pickle for protocol 0, such that it pickle.py fails to re-use the first pickled representation of strings involving characters that have to be escaped.
1815 lines
63 KiB
Python
1815 lines
63 KiB
Python
"""Create portable serialized representations of Python objects.
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See module copyreg for a mechanism for registering custom picklers.
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See module pickletools source for extensive comments.
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Classes:
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Pickler
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Unpickler
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Functions:
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dump(object, file)
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dumps(object) -> string
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load(file) -> object
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loads(bytes) -> object
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Misc variables:
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__version__
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format_version
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compatible_formats
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"""
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from types import FunctionType
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from copyreg import dispatch_table
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from copyreg import _extension_registry, _inverted_registry, _extension_cache
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from itertools import islice
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from functools import partial
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import sys
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from sys import maxsize
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from struct import pack, unpack
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import re
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import io
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import codecs
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import _compat_pickle
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__all__ = ["PickleError", "PicklingError", "UnpicklingError", "Pickler",
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"Unpickler", "dump", "dumps", "load", "loads"]
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try:
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from _pickle import PickleBuffer
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__all__.append("PickleBuffer")
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_HAVE_PICKLE_BUFFER = True
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except ImportError:
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_HAVE_PICKLE_BUFFER = False
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# Shortcut for use in isinstance testing
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bytes_types = (bytes, bytearray)
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# These are purely informational; no code uses these.
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format_version = "4.0" # File format version we write
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compatible_formats = ["1.0", # Original protocol 0
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"1.1", # Protocol 0 with INST added
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"1.2", # Original protocol 1
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"1.3", # Protocol 1 with BINFLOAT added
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"2.0", # Protocol 2
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"3.0", # Protocol 3
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"4.0", # Protocol 4
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"5.0", # Protocol 5
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] # Old format versions we can read
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# This is the highest protocol number we know how to read.
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HIGHEST_PROTOCOL = 5
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# The protocol we write by default. May be less than HIGHEST_PROTOCOL.
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# Only bump this if the oldest still supported version of Python already
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# includes it.
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DEFAULT_PROTOCOL = 4
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class PickleError(Exception):
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"""A common base class for the other pickling exceptions."""
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pass
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class PicklingError(PickleError):
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"""This exception is raised when an unpicklable object is passed to the
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dump() method.
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"""
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pass
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class UnpicklingError(PickleError):
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"""This exception is raised when there is a problem unpickling an object,
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such as a security violation.
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Note that other exceptions may also be raised during unpickling, including
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(but not necessarily limited to) AttributeError, EOFError, ImportError,
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and IndexError.
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"""
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pass
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# An instance of _Stop is raised by Unpickler.load_stop() in response to
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# the STOP opcode, passing the object that is the result of unpickling.
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class _Stop(Exception):
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def __init__(self, value):
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self.value = value
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# Pickle opcodes. See pickletools.py for extensive docs. The listing
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# here is in kind-of alphabetical order of 1-character pickle code.
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# pickletools groups them by purpose.
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MARK = b'(' # push special markobject on stack
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STOP = b'.' # every pickle ends with STOP
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POP = b'0' # discard topmost stack item
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POP_MARK = b'1' # discard stack top through topmost markobject
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DUP = b'2' # duplicate top stack item
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FLOAT = b'F' # push float object; decimal string argument
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INT = b'I' # push integer or bool; decimal string argument
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BININT = b'J' # push four-byte signed int
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BININT1 = b'K' # push 1-byte unsigned int
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LONG = b'L' # push long; decimal string argument
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BININT2 = b'M' # push 2-byte unsigned int
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NONE = b'N' # push None
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PERSID = b'P' # push persistent object; id is taken from string arg
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BINPERSID = b'Q' # " " " ; " " " " stack
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REDUCE = b'R' # apply callable to argtuple, both on stack
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STRING = b'S' # push string; NL-terminated string argument
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BINSTRING = b'T' # push string; counted binary string argument
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SHORT_BINSTRING= b'U' # " " ; " " " " < 256 bytes
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UNICODE = b'V' # push Unicode string; raw-unicode-escaped'd argument
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BINUNICODE = b'X' # " " " ; counted UTF-8 string argument
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APPEND = b'a' # append stack top to list below it
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BUILD = b'b' # call __setstate__ or __dict__.update()
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GLOBAL = b'c' # push self.find_class(modname, name); 2 string args
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DICT = b'd' # build a dict from stack items
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EMPTY_DICT = b'}' # push empty dict
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APPENDS = b'e' # extend list on stack by topmost stack slice
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GET = b'g' # push item from memo on stack; index is string arg
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BINGET = b'h' # " " " " " " ; " " 1-byte arg
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INST = b'i' # build & push class instance
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LONG_BINGET = b'j' # push item from memo on stack; index is 4-byte arg
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LIST = b'l' # build list from topmost stack items
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EMPTY_LIST = b']' # push empty list
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OBJ = b'o' # build & push class instance
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PUT = b'p' # store stack top in memo; index is string arg
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BINPUT = b'q' # " " " " " ; " " 1-byte arg
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LONG_BINPUT = b'r' # " " " " " ; " " 4-byte arg
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SETITEM = b's' # add key+value pair to dict
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TUPLE = b't' # build tuple from topmost stack items
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EMPTY_TUPLE = b')' # push empty tuple
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SETITEMS = b'u' # modify dict by adding topmost key+value pairs
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BINFLOAT = b'G' # push float; arg is 8-byte float encoding
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TRUE = b'I01\n' # not an opcode; see INT docs in pickletools.py
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FALSE = b'I00\n' # not an opcode; see INT docs in pickletools.py
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# Protocol 2
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PROTO = b'\x80' # identify pickle protocol
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NEWOBJ = b'\x81' # build object by applying cls.__new__ to argtuple
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EXT1 = b'\x82' # push object from extension registry; 1-byte index
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EXT2 = b'\x83' # ditto, but 2-byte index
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EXT4 = b'\x84' # ditto, but 4-byte index
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TUPLE1 = b'\x85' # build 1-tuple from stack top
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TUPLE2 = b'\x86' # build 2-tuple from two topmost stack items
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TUPLE3 = b'\x87' # build 3-tuple from three topmost stack items
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NEWTRUE = b'\x88' # push True
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NEWFALSE = b'\x89' # push False
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LONG1 = b'\x8a' # push long from < 256 bytes
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LONG4 = b'\x8b' # push really big long
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_tuplesize2code = [EMPTY_TUPLE, TUPLE1, TUPLE2, TUPLE3]
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# Protocol 3 (Python 3.x)
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BINBYTES = b'B' # push bytes; counted binary string argument
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SHORT_BINBYTES = b'C' # " " ; " " " " < 256 bytes
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# Protocol 4
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SHORT_BINUNICODE = b'\x8c' # push short string; UTF-8 length < 256 bytes
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BINUNICODE8 = b'\x8d' # push very long string
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BINBYTES8 = b'\x8e' # push very long bytes string
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EMPTY_SET = b'\x8f' # push empty set on the stack
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ADDITEMS = b'\x90' # modify set by adding topmost stack items
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FROZENSET = b'\x91' # build frozenset from topmost stack items
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NEWOBJ_EX = b'\x92' # like NEWOBJ but work with keyword only arguments
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STACK_GLOBAL = b'\x93' # same as GLOBAL but using names on the stacks
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MEMOIZE = b'\x94' # store top of the stack in memo
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FRAME = b'\x95' # indicate the beginning of a new frame
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# Protocol 5
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BYTEARRAY8 = b'\x96' # push bytearray
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NEXT_BUFFER = b'\x97' # push next out-of-band buffer
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READONLY_BUFFER = b'\x98' # make top of stack readonly
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__all__.extend([x for x in dir() if re.match("[A-Z][A-Z0-9_]+$", x)])
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class _Framer:
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_FRAME_SIZE_MIN = 4
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_FRAME_SIZE_TARGET = 64 * 1024
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def __init__(self, file_write):
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self.file_write = file_write
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self.current_frame = None
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def start_framing(self):
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self.current_frame = io.BytesIO()
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def end_framing(self):
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if self.current_frame and self.current_frame.tell() > 0:
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self.commit_frame(force=True)
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self.current_frame = None
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def commit_frame(self, force=False):
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if self.current_frame:
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f = self.current_frame
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if f.tell() >= self._FRAME_SIZE_TARGET or force:
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data = f.getbuffer()
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write = self.file_write
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if len(data) >= self._FRAME_SIZE_MIN:
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# Issue a single call to the write method of the underlying
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# file object for the frame opcode with the size of the
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# frame. The concatenation is expected to be less expensive
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# than issuing an additional call to write.
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write(FRAME + pack("<Q", len(data)))
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# Issue a separate call to write to append the frame
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# contents without concatenation to the above to avoid a
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# memory copy.
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write(data)
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# Start the new frame with a new io.BytesIO instance so that
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# the file object can have delayed access to the previous frame
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# contents via an unreleased memoryview of the previous
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# io.BytesIO instance.
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self.current_frame = io.BytesIO()
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def write(self, data):
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if self.current_frame:
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return self.current_frame.write(data)
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else:
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return self.file_write(data)
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def write_large_bytes(self, header, payload):
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write = self.file_write
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if self.current_frame:
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# Terminate the current frame and flush it to the file.
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self.commit_frame(force=True)
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# Perform direct write of the header and payload of the large binary
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# object. Be careful not to concatenate the header and the payload
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# prior to calling 'write' as we do not want to allocate a large
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# temporary bytes object.
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# We intentionally do not insert a protocol 4 frame opcode to make
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# it possible to optimize file.read calls in the loader.
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write(header)
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write(payload)
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class _Unframer:
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def __init__(self, file_read, file_readline, file_tell=None):
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self.file_read = file_read
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self.file_readline = file_readline
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self.current_frame = None
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def readinto(self, buf):
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if self.current_frame:
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n = self.current_frame.readinto(buf)
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if n == 0 and len(buf) != 0:
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self.current_frame = None
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n = len(buf)
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buf[:] = self.file_read(n)
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return n
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if n < len(buf):
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raise UnpicklingError(
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"pickle exhausted before end of frame")
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return n
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else:
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n = len(buf)
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buf[:] = self.file_read(n)
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return n
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def read(self, n):
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if self.current_frame:
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data = self.current_frame.read(n)
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if not data and n != 0:
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self.current_frame = None
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return self.file_read(n)
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if len(data) < n:
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raise UnpicklingError(
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"pickle exhausted before end of frame")
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return data
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else:
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return self.file_read(n)
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def readline(self):
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if self.current_frame:
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data = self.current_frame.readline()
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if not data:
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self.current_frame = None
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return self.file_readline()
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if data[-1] != b'\n'[0]:
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raise UnpicklingError(
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"pickle exhausted before end of frame")
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return data
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else:
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return self.file_readline()
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def load_frame(self, frame_size):
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if self.current_frame and self.current_frame.read() != b'':
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raise UnpicklingError(
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"beginning of a new frame before end of current frame")
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self.current_frame = io.BytesIO(self.file_read(frame_size))
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# Tools used for pickling.
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def _getattribute(obj, name):
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for subpath in name.split('.'):
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if subpath == '<locals>':
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raise AttributeError("Can't get local attribute {!r} on {!r}"
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.format(name, obj))
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try:
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parent = obj
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obj = getattr(obj, subpath)
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except AttributeError:
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raise AttributeError("Can't get attribute {!r} on {!r}"
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.format(name, obj)) from None
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return obj, parent
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def whichmodule(obj, name):
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"""Find the module an object belong to."""
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module_name = getattr(obj, '__module__', None)
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if module_name is not None:
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return module_name
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# Protect the iteration by using a list copy of sys.modules against dynamic
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# modules that trigger imports of other modules upon calls to getattr.
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for module_name, module in sys.modules.copy().items():
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if (module_name == '__main__'
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or module_name == '__mp_main__' # bpo-42406
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or module is None):
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continue
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try:
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if _getattribute(module, name)[0] is obj:
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return module_name
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except AttributeError:
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pass
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return '__main__'
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def encode_long(x):
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r"""Encode a long to a two's complement little-endian binary string.
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Note that 0 is a special case, returning an empty string, to save a
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byte in the LONG1 pickling context.
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>>> encode_long(0)
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b''
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>>> encode_long(255)
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b'\xff\x00'
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>>> encode_long(32767)
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b'\xff\x7f'
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>>> encode_long(-256)
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b'\x00\xff'
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>>> encode_long(-32768)
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b'\x00\x80'
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>>> encode_long(-128)
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b'\x80'
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>>> encode_long(127)
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b'\x7f'
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>>>
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"""
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if x == 0:
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return b''
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nbytes = (x.bit_length() >> 3) + 1
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result = x.to_bytes(nbytes, byteorder='little', signed=True)
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if x < 0 and nbytes > 1:
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if result[-1] == 0xff and (result[-2] & 0x80) != 0:
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result = result[:-1]
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return result
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def decode_long(data):
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r"""Decode a long from a two's complement little-endian binary string.
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>>> decode_long(b'')
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0
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>>> decode_long(b"\xff\x00")
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255
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>>> decode_long(b"\xff\x7f")
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32767
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>>> decode_long(b"\x00\xff")
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-256
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>>> decode_long(b"\x00\x80")
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-32768
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>>> decode_long(b"\x80")
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-128
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>>> decode_long(b"\x7f")
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127
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"""
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return int.from_bytes(data, byteorder='little', signed=True)
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_NoValue = object()
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# Pickling machinery
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class _Pickler:
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def __init__(self, file, protocol=None, *, fix_imports=True,
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buffer_callback=None):
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"""This takes a binary file for writing a pickle data stream.
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The optional *protocol* argument tells the pickler to use the
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given protocol; supported protocols are 0, 1, 2, 3, 4 and 5.
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The default protocol is 4. It was introduced in Python 3.4, and
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is incompatible with previous versions.
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Specifying a negative protocol version selects the highest
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protocol version supported. The higher the protocol used, the
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more recent the version of Python needed to read the pickle
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produced.
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The *file* argument must have a write() method that accepts a
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single bytes argument. It can thus be a file object opened for
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binary writing, an io.BytesIO instance, or any other custom
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object that meets this interface.
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If *fix_imports* is True and *protocol* is less than 3, pickle
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will try to map the new Python 3 names to the old module names
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used in Python 2, so that the pickle data stream is readable
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with Python 2.
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If *buffer_callback* is None (the default), buffer views are
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serialized into *file* as part of the pickle stream.
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If *buffer_callback* is not None, then it can be called any number
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of times with a buffer view. If the callback returns a false value
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(such as None), the given buffer is out-of-band; otherwise the
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buffer is serialized in-band, i.e. inside the pickle stream.
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It is an error if *buffer_callback* is not None and *protocol*
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is None or smaller than 5.
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"""
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if protocol is None:
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protocol = DEFAULT_PROTOCOL
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if protocol < 0:
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protocol = HIGHEST_PROTOCOL
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elif not 0 <= protocol <= HIGHEST_PROTOCOL:
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raise ValueError("pickle protocol must be <= %d" % HIGHEST_PROTOCOL)
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if buffer_callback is not None and protocol < 5:
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raise ValueError("buffer_callback needs protocol >= 5")
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self._buffer_callback = buffer_callback
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try:
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self._file_write = file.write
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except AttributeError:
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raise TypeError("file must have a 'write' attribute")
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self.framer = _Framer(self._file_write)
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self.write = self.framer.write
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self._write_large_bytes = self.framer.write_large_bytes
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self.memo = {}
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self.proto = int(protocol)
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self.bin = protocol >= 1
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self.fast = 0
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self.fix_imports = fix_imports and protocol < 3
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def clear_memo(self):
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"""Clears the pickler's "memo".
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The memo is the data structure that remembers which objects the
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pickler has already seen, so that shared or recursive objects
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are pickled by reference and not by value. This method is
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useful when re-using picklers.
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"""
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self.memo.clear()
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def dump(self, obj):
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"""Write a pickled representation of obj to the open file."""
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# Check whether Pickler was initialized correctly. This is
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# only needed to mimic the behavior of _pickle.Pickler.dump().
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if not hasattr(self, "_file_write"):
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raise PicklingError("Pickler.__init__() was not called by "
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"%s.__init__()" % (self.__class__.__name__,))
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if self.proto >= 2:
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self.write(PROTO + pack("<B", self.proto))
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if self.proto >= 4:
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self.framer.start_framing()
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self.save(obj)
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self.write(STOP)
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self.framer.end_framing()
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def memoize(self, obj):
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"""Store an object in the memo."""
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# The Pickler memo is a dictionary mapping object ids to 2-tuples
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# that contain the Unpickler memo key and the object being memoized.
|
|
# The memo key is written to the pickle and will become
|
|
# the key in the Unpickler's memo. The object is stored in the
|
|
# Pickler memo so that transient objects are kept alive during
|
|
# pickling.
|
|
|
|
# The use of the Unpickler memo length as the memo key is just a
|
|
# convention. The only requirement is that the memo values be unique.
|
|
# But there appears no advantage to any other scheme, and this
|
|
# scheme allows the Unpickler memo to be implemented as a plain (but
|
|
# growable) array, indexed by memo key.
|
|
if self.fast:
|
|
return
|
|
assert id(obj) not in self.memo
|
|
idx = len(self.memo)
|
|
self.write(self.put(idx))
|
|
self.memo[id(obj)] = idx, obj
|
|
|
|
# Return a PUT (BINPUT, LONG_BINPUT) opcode string, with argument i.
|
|
def put(self, idx):
|
|
if self.proto >= 4:
|
|
return MEMOIZE
|
|
elif self.bin:
|
|
if idx < 256:
|
|
return BINPUT + pack("<B", idx)
|
|
else:
|
|
return LONG_BINPUT + pack("<I", idx)
|
|
else:
|
|
return PUT + repr(idx).encode("ascii") + b'\n'
|
|
|
|
# Return a GET (BINGET, LONG_BINGET) opcode string, with argument i.
|
|
def get(self, i):
|
|
if self.bin:
|
|
if i < 256:
|
|
return BINGET + pack("<B", i)
|
|
else:
|
|
return LONG_BINGET + pack("<I", i)
|
|
|
|
return GET + repr(i).encode("ascii") + b'\n'
|
|
|
|
def save(self, obj, save_persistent_id=True):
|
|
self.framer.commit_frame()
|
|
|
|
# Check for persistent id (defined by a subclass)
|
|
pid = self.persistent_id(obj)
|
|
if pid is not None and save_persistent_id:
|
|
self.save_pers(pid)
|
|
return
|
|
|
|
# Check the memo
|
|
x = self.memo.get(id(obj))
|
|
if x is not None:
|
|
self.write(self.get(x[0]))
|
|
return
|
|
|
|
rv = NotImplemented
|
|
reduce = getattr(self, "reducer_override", _NoValue)
|
|
if reduce is not _NoValue:
|
|
rv = reduce(obj)
|
|
|
|
if rv is NotImplemented:
|
|
# Check the type dispatch table
|
|
t = type(obj)
|
|
f = self.dispatch.get(t)
|
|
if f is not None:
|
|
f(self, obj) # Call unbound method with explicit self
|
|
return
|
|
|
|
# Check private dispatch table if any, or else
|
|
# copyreg.dispatch_table
|
|
reduce = getattr(self, 'dispatch_table', dispatch_table).get(t, _NoValue)
|
|
if reduce is not _NoValue:
|
|
rv = reduce(obj)
|
|
else:
|
|
# Check for a class with a custom metaclass; treat as regular
|
|
# class
|
|
if issubclass(t, type):
|
|
self.save_global(obj)
|
|
return
|
|
|
|
# Check for a __reduce_ex__ method, fall back to __reduce__
|
|
reduce = getattr(obj, "__reduce_ex__", _NoValue)
|
|
if reduce is not _NoValue:
|
|
rv = reduce(self.proto)
|
|
else:
|
|
reduce = getattr(obj, "__reduce__", _NoValue)
|
|
if reduce is not _NoValue:
|
|
rv = reduce()
|
|
else:
|
|
raise PicklingError("Can't pickle %r object: %r" %
|
|
(t.__name__, obj))
|
|
|
|
# Check for string returned by reduce(), meaning "save as global"
|
|
if isinstance(rv, str):
|
|
self.save_global(obj, rv)
|
|
return
|
|
|
|
# Assert that reduce() returned a tuple
|
|
if not isinstance(rv, tuple):
|
|
raise PicklingError("%s must return string or tuple" % reduce)
|
|
|
|
# Assert that it returned an appropriately sized tuple
|
|
l = len(rv)
|
|
if not (2 <= l <= 6):
|
|
raise PicklingError("Tuple returned by %s must have "
|
|
"two to six elements" % reduce)
|
|
|
|
# Save the reduce() output and finally memoize the object
|
|
self.save_reduce(obj=obj, *rv)
|
|
|
|
def persistent_id(self, obj):
|
|
# This exists so a subclass can override it
|
|
return None
|
|
|
|
def save_pers(self, pid):
|
|
# Save a persistent id reference
|
|
if self.bin:
|
|
self.save(pid, save_persistent_id=False)
|
|
self.write(BINPERSID)
|
|
else:
|
|
try:
|
|
self.write(PERSID + str(pid).encode("ascii") + b'\n')
|
|
except UnicodeEncodeError:
|
|
raise PicklingError(
|
|
"persistent IDs in protocol 0 must be ASCII strings")
|
|
|
|
def save_reduce(self, func, args, state=None, listitems=None,
|
|
dictitems=None, state_setter=None, *, obj=None):
|
|
# This API is called by some subclasses
|
|
|
|
if not isinstance(args, tuple):
|
|
raise PicklingError("args from save_reduce() must be a tuple")
|
|
if not callable(func):
|
|
raise PicklingError("func from save_reduce() must be callable")
|
|
|
|
save = self.save
|
|
write = self.write
|
|
|
|
func_name = getattr(func, "__name__", "")
|
|
if self.proto >= 2 and func_name == "__newobj_ex__":
|
|
cls, args, kwargs = args
|
|
if not hasattr(cls, "__new__"):
|
|
raise PicklingError("args[0] from {} args has no __new__"
|
|
.format(func_name))
|
|
if obj is not None and cls is not obj.__class__:
|
|
raise PicklingError("args[0] from {} args has the wrong class"
|
|
.format(func_name))
|
|
if self.proto >= 4:
|
|
save(cls)
|
|
save(args)
|
|
save(kwargs)
|
|
write(NEWOBJ_EX)
|
|
else:
|
|
func = partial(cls.__new__, cls, *args, **kwargs)
|
|
save(func)
|
|
save(())
|
|
write(REDUCE)
|
|
elif self.proto >= 2 and func_name == "__newobj__":
|
|
# A __reduce__ implementation can direct protocol 2 or newer to
|
|
# use the more efficient NEWOBJ opcode, while still
|
|
# allowing protocol 0 and 1 to work normally. For this to
|
|
# work, the function returned by __reduce__ should be
|
|
# called __newobj__, and its first argument should be a
|
|
# class. The implementation for __newobj__
|
|
# should be as follows, although pickle has no way to
|
|
# verify this:
|
|
#
|
|
# def __newobj__(cls, *args):
|
|
# return cls.__new__(cls, *args)
|
|
#
|
|
# Protocols 0 and 1 will pickle a reference to __newobj__,
|
|
# while protocol 2 (and above) will pickle a reference to
|
|
# cls, the remaining args tuple, and the NEWOBJ code,
|
|
# which calls cls.__new__(cls, *args) at unpickling time
|
|
# (see load_newobj below). If __reduce__ returns a
|
|
# three-tuple, the state from the third tuple item will be
|
|
# pickled regardless of the protocol, calling __setstate__
|
|
# at unpickling time (see load_build below).
|
|
#
|
|
# Note that no standard __newobj__ implementation exists;
|
|
# you have to provide your own. This is to enforce
|
|
# compatibility with Python 2.2 (pickles written using
|
|
# protocol 0 or 1 in Python 2.3 should be unpicklable by
|
|
# Python 2.2).
|
|
cls = args[0]
|
|
if not hasattr(cls, "__new__"):
|
|
raise PicklingError(
|
|
"args[0] from __newobj__ args has no __new__")
|
|
if obj is not None and cls is not obj.__class__:
|
|
raise PicklingError(
|
|
"args[0] from __newobj__ args has the wrong class")
|
|
args = args[1:]
|
|
save(cls)
|
|
save(args)
|
|
write(NEWOBJ)
|
|
else:
|
|
save(func)
|
|
save(args)
|
|
write(REDUCE)
|
|
|
|
if obj is not None:
|
|
# If the object is already in the memo, this means it is
|
|
# recursive. In this case, throw away everything we put on the
|
|
# stack, and fetch the object back from the memo.
|
|
if id(obj) in self.memo:
|
|
write(POP + self.get(self.memo[id(obj)][0]))
|
|
else:
|
|
self.memoize(obj)
|
|
|
|
# More new special cases (that work with older protocols as
|
|
# well): when __reduce__ returns a tuple with 4 or 5 items,
|
|
# the 4th and 5th item should be iterators that provide list
|
|
# items and dict items (as (key, value) tuples), or None.
|
|
|
|
if listitems is not None:
|
|
self._batch_appends(listitems)
|
|
|
|
if dictitems is not None:
|
|
self._batch_setitems(dictitems)
|
|
|
|
if state is not None:
|
|
if state_setter is None:
|
|
save(state)
|
|
write(BUILD)
|
|
else:
|
|
# If a state_setter is specified, call it instead of load_build
|
|
# to update obj's with its previous state.
|
|
# First, push state_setter and its tuple of expected arguments
|
|
# (obj, state) onto the stack.
|
|
save(state_setter)
|
|
save(obj) # simple BINGET opcode as obj is already memoized.
|
|
save(state)
|
|
write(TUPLE2)
|
|
# Trigger a state_setter(obj, state) function call.
|
|
write(REDUCE)
|
|
# The purpose of state_setter is to carry-out an
|
|
# inplace modification of obj. We do not care about what the
|
|
# method might return, so its output is eventually removed from
|
|
# the stack.
|
|
write(POP)
|
|
|
|
# Methods below this point are dispatched through the dispatch table
|
|
|
|
dispatch = {}
|
|
|
|
def save_none(self, obj):
|
|
self.write(NONE)
|
|
dispatch[type(None)] = save_none
|
|
|
|
def save_bool(self, obj):
|
|
if self.proto >= 2:
|
|
self.write(NEWTRUE if obj else NEWFALSE)
|
|
else:
|
|
self.write(TRUE if obj else FALSE)
|
|
dispatch[bool] = save_bool
|
|
|
|
def save_long(self, obj):
|
|
if self.bin:
|
|
# If the int is small enough to fit in a signed 4-byte 2's-comp
|
|
# format, we can store it more efficiently than the general
|
|
# case.
|
|
# First one- and two-byte unsigned ints:
|
|
if obj >= 0:
|
|
if obj <= 0xff:
|
|
self.write(BININT1 + pack("<B", obj))
|
|
return
|
|
if obj <= 0xffff:
|
|
self.write(BININT2 + pack("<H", obj))
|
|
return
|
|
# Next check for 4-byte signed ints:
|
|
if -0x80000000 <= obj <= 0x7fffffff:
|
|
self.write(BININT + pack("<i", obj))
|
|
return
|
|
if self.proto >= 2:
|
|
encoded = encode_long(obj)
|
|
n = len(encoded)
|
|
if n < 256:
|
|
self.write(LONG1 + pack("<B", n) + encoded)
|
|
else:
|
|
self.write(LONG4 + pack("<i", n) + encoded)
|
|
return
|
|
if -0x80000000 <= obj <= 0x7fffffff:
|
|
self.write(INT + repr(obj).encode("ascii") + b'\n')
|
|
else:
|
|
self.write(LONG + repr(obj).encode("ascii") + b'L\n')
|
|
dispatch[int] = save_long
|
|
|
|
def save_float(self, obj):
|
|
if self.bin:
|
|
self.write(BINFLOAT + pack('>d', obj))
|
|
else:
|
|
self.write(FLOAT + repr(obj).encode("ascii") + b'\n')
|
|
dispatch[float] = save_float
|
|
|
|
def save_bytes(self, obj):
|
|
if self.proto < 3:
|
|
if not obj: # bytes object is empty
|
|
self.save_reduce(bytes, (), obj=obj)
|
|
else:
|
|
self.save_reduce(codecs.encode,
|
|
(str(obj, 'latin1'), 'latin1'), obj=obj)
|
|
return
|
|
n = len(obj)
|
|
if n <= 0xff:
|
|
self.write(SHORT_BINBYTES + pack("<B", n) + obj)
|
|
elif n > 0xffffffff and self.proto >= 4:
|
|
self._write_large_bytes(BINBYTES8 + pack("<Q", n), obj)
|
|
elif n >= self.framer._FRAME_SIZE_TARGET:
|
|
self._write_large_bytes(BINBYTES + pack("<I", n), obj)
|
|
else:
|
|
self.write(BINBYTES + pack("<I", n) + obj)
|
|
self.memoize(obj)
|
|
dispatch[bytes] = save_bytes
|
|
|
|
def save_bytearray(self, obj):
|
|
if self.proto < 5:
|
|
if not obj: # bytearray is empty
|
|
self.save_reduce(bytearray, (), obj=obj)
|
|
else:
|
|
self.save_reduce(bytearray, (bytes(obj),), obj=obj)
|
|
return
|
|
n = len(obj)
|
|
if n >= self.framer._FRAME_SIZE_TARGET:
|
|
self._write_large_bytes(BYTEARRAY8 + pack("<Q", n), obj)
|
|
else:
|
|
self.write(BYTEARRAY8 + pack("<Q", n) + obj)
|
|
self.memoize(obj)
|
|
dispatch[bytearray] = save_bytearray
|
|
|
|
if _HAVE_PICKLE_BUFFER:
|
|
def save_picklebuffer(self, obj):
|
|
if self.proto < 5:
|
|
raise PicklingError("PickleBuffer can only pickled with "
|
|
"protocol >= 5")
|
|
with obj.raw() as m:
|
|
if not m.contiguous:
|
|
raise PicklingError("PickleBuffer can not be pickled when "
|
|
"pointing to a non-contiguous buffer")
|
|
in_band = True
|
|
if self._buffer_callback is not None:
|
|
in_band = bool(self._buffer_callback(obj))
|
|
if in_band:
|
|
# Write data in-band
|
|
# XXX The C implementation avoids a copy here
|
|
if m.readonly:
|
|
self.save_bytes(m.tobytes())
|
|
else:
|
|
self.save_bytearray(m.tobytes())
|
|
else:
|
|
# Write data out-of-band
|
|
self.write(NEXT_BUFFER)
|
|
if m.readonly:
|
|
self.write(READONLY_BUFFER)
|
|
|
|
dispatch[PickleBuffer] = save_picklebuffer
|
|
|
|
def save_str(self, obj):
|
|
if self.bin:
|
|
encoded = obj.encode('utf-8', 'surrogatepass')
|
|
n = len(encoded)
|
|
if n <= 0xff and self.proto >= 4:
|
|
self.write(SHORT_BINUNICODE + pack("<B", n) + encoded)
|
|
elif n > 0xffffffff and self.proto >= 4:
|
|
self._write_large_bytes(BINUNICODE8 + pack("<Q", n), encoded)
|
|
elif n >= self.framer._FRAME_SIZE_TARGET:
|
|
self._write_large_bytes(BINUNICODE + pack("<I", n), encoded)
|
|
else:
|
|
self.write(BINUNICODE + pack("<I", n) + encoded)
|
|
else:
|
|
# Escape what raw-unicode-escape doesn't, but memoize the original.
|
|
tmp = obj.replace("\\", "\\u005c")
|
|
tmp = tmp.replace("\0", "\\u0000")
|
|
tmp = tmp.replace("\n", "\\u000a")
|
|
tmp = tmp.replace("\r", "\\u000d")
|
|
tmp = tmp.replace("\x1a", "\\u001a") # EOF on DOS
|
|
self.write(UNICODE + tmp.encode('raw-unicode-escape') + b'\n')
|
|
self.memoize(obj)
|
|
dispatch[str] = save_str
|
|
|
|
def save_tuple(self, obj):
|
|
if not obj: # tuple is empty
|
|
if self.bin:
|
|
self.write(EMPTY_TUPLE)
|
|
else:
|
|
self.write(MARK + TUPLE)
|
|
return
|
|
|
|
n = len(obj)
|
|
save = self.save
|
|
memo = self.memo
|
|
if n <= 3 and self.proto >= 2:
|
|
for element in obj:
|
|
save(element)
|
|
# Subtle. Same as in the big comment below.
|
|
if id(obj) in memo:
|
|
get = self.get(memo[id(obj)][0])
|
|
self.write(POP * n + get)
|
|
else:
|
|
self.write(_tuplesize2code[n])
|
|
self.memoize(obj)
|
|
return
|
|
|
|
# proto 0 or proto 1 and tuple isn't empty, or proto > 1 and tuple
|
|
# has more than 3 elements.
|
|
write = self.write
|
|
write(MARK)
|
|
for element in obj:
|
|
save(element)
|
|
|
|
if id(obj) in memo:
|
|
# Subtle. d was not in memo when we entered save_tuple(), so
|
|
# the process of saving the tuple's elements must have saved
|
|
# the tuple itself: the tuple is recursive. The proper action
|
|
# now is to throw away everything we put on the stack, and
|
|
# simply GET the tuple (it's already constructed). This check
|
|
# could have been done in the "for element" loop instead, but
|
|
# recursive tuples are a rare thing.
|
|
get = self.get(memo[id(obj)][0])
|
|
if self.bin:
|
|
write(POP_MARK + get)
|
|
else: # proto 0 -- POP_MARK not available
|
|
write(POP * (n+1) + get)
|
|
return
|
|
|
|
# No recursion.
|
|
write(TUPLE)
|
|
self.memoize(obj)
|
|
|
|
dispatch[tuple] = save_tuple
|
|
|
|
def save_list(self, obj):
|
|
if self.bin:
|
|
self.write(EMPTY_LIST)
|
|
else: # proto 0 -- can't use EMPTY_LIST
|
|
self.write(MARK + LIST)
|
|
|
|
self.memoize(obj)
|
|
self._batch_appends(obj)
|
|
|
|
dispatch[list] = save_list
|
|
|
|
_BATCHSIZE = 1000
|
|
|
|
def _batch_appends(self, items):
|
|
# Helper to batch up APPENDS sequences
|
|
save = self.save
|
|
write = self.write
|
|
|
|
if not self.bin:
|
|
for x in items:
|
|
save(x)
|
|
write(APPEND)
|
|
return
|
|
|
|
it = iter(items)
|
|
while True:
|
|
tmp = list(islice(it, self._BATCHSIZE))
|
|
n = len(tmp)
|
|
if n > 1:
|
|
write(MARK)
|
|
for x in tmp:
|
|
save(x)
|
|
write(APPENDS)
|
|
elif n:
|
|
save(tmp[0])
|
|
write(APPEND)
|
|
# else tmp is empty, and we're done
|
|
if n < self._BATCHSIZE:
|
|
return
|
|
|
|
def save_dict(self, obj):
|
|
if self.bin:
|
|
self.write(EMPTY_DICT)
|
|
else: # proto 0 -- can't use EMPTY_DICT
|
|
self.write(MARK + DICT)
|
|
|
|
self.memoize(obj)
|
|
self._batch_setitems(obj.items())
|
|
|
|
dispatch[dict] = save_dict
|
|
|
|
def _batch_setitems(self, items):
|
|
# Helper to batch up SETITEMS sequences; proto >= 1 only
|
|
save = self.save
|
|
write = self.write
|
|
|
|
if not self.bin:
|
|
for k, v in items:
|
|
save(k)
|
|
save(v)
|
|
write(SETITEM)
|
|
return
|
|
|
|
it = iter(items)
|
|
while True:
|
|
tmp = list(islice(it, self._BATCHSIZE))
|
|
n = len(tmp)
|
|
if n > 1:
|
|
write(MARK)
|
|
for k, v in tmp:
|
|
save(k)
|
|
save(v)
|
|
write(SETITEMS)
|
|
elif n:
|
|
k, v = tmp[0]
|
|
save(k)
|
|
save(v)
|
|
write(SETITEM)
|
|
# else tmp is empty, and we're done
|
|
if n < self._BATCHSIZE:
|
|
return
|
|
|
|
def save_set(self, obj):
|
|
save = self.save
|
|
write = self.write
|
|
|
|
if self.proto < 4:
|
|
self.save_reduce(set, (list(obj),), obj=obj)
|
|
return
|
|
|
|
write(EMPTY_SET)
|
|
self.memoize(obj)
|
|
|
|
it = iter(obj)
|
|
while True:
|
|
batch = list(islice(it, self._BATCHSIZE))
|
|
n = len(batch)
|
|
if n > 0:
|
|
write(MARK)
|
|
for item in batch:
|
|
save(item)
|
|
write(ADDITEMS)
|
|
if n < self._BATCHSIZE:
|
|
return
|
|
dispatch[set] = save_set
|
|
|
|
def save_frozenset(self, obj):
|
|
save = self.save
|
|
write = self.write
|
|
|
|
if self.proto < 4:
|
|
self.save_reduce(frozenset, (list(obj),), obj=obj)
|
|
return
|
|
|
|
write(MARK)
|
|
for item in obj:
|
|
save(item)
|
|
|
|
if id(obj) in self.memo:
|
|
# If the object is already in the memo, this means it is
|
|
# recursive. In this case, throw away everything we put on the
|
|
# stack, and fetch the object back from the memo.
|
|
write(POP_MARK + self.get(self.memo[id(obj)][0]))
|
|
return
|
|
|
|
write(FROZENSET)
|
|
self.memoize(obj)
|
|
dispatch[frozenset] = save_frozenset
|
|
|
|
def save_global(self, obj, name=None):
|
|
write = self.write
|
|
memo = self.memo
|
|
|
|
if name is None:
|
|
name = getattr(obj, '__qualname__', None)
|
|
if name is None:
|
|
name = obj.__name__
|
|
|
|
module_name = whichmodule(obj, name)
|
|
try:
|
|
__import__(module_name, level=0)
|
|
module = sys.modules[module_name]
|
|
obj2, parent = _getattribute(module, name)
|
|
except (ImportError, KeyError, AttributeError):
|
|
raise PicklingError(
|
|
"Can't pickle %r: it's not found as %s.%s" %
|
|
(obj, module_name, name)) from None
|
|
else:
|
|
if obj2 is not obj:
|
|
raise PicklingError(
|
|
"Can't pickle %r: it's not the same object as %s.%s" %
|
|
(obj, module_name, name))
|
|
|
|
if self.proto >= 2:
|
|
code = _extension_registry.get((module_name, name))
|
|
if code:
|
|
assert code > 0
|
|
if code <= 0xff:
|
|
write(EXT1 + pack("<B", code))
|
|
elif code <= 0xffff:
|
|
write(EXT2 + pack("<H", code))
|
|
else:
|
|
write(EXT4 + pack("<i", code))
|
|
return
|
|
lastname = name.rpartition('.')[2]
|
|
if parent is module:
|
|
name = lastname
|
|
# Non-ASCII identifiers are supported only with protocols >= 3.
|
|
if self.proto >= 4:
|
|
self.save(module_name)
|
|
self.save(name)
|
|
write(STACK_GLOBAL)
|
|
elif parent is not module:
|
|
self.save_reduce(getattr, (parent, lastname))
|
|
elif self.proto >= 3:
|
|
write(GLOBAL + bytes(module_name, "utf-8") + b'\n' +
|
|
bytes(name, "utf-8") + b'\n')
|
|
else:
|
|
if self.fix_imports:
|
|
r_name_mapping = _compat_pickle.REVERSE_NAME_MAPPING
|
|
r_import_mapping = _compat_pickle.REVERSE_IMPORT_MAPPING
|
|
if (module_name, name) in r_name_mapping:
|
|
module_name, name = r_name_mapping[(module_name, name)]
|
|
elif module_name in r_import_mapping:
|
|
module_name = r_import_mapping[module_name]
|
|
try:
|
|
write(GLOBAL + bytes(module_name, "ascii") + b'\n' +
|
|
bytes(name, "ascii") + b'\n')
|
|
except UnicodeEncodeError:
|
|
raise PicklingError(
|
|
"can't pickle global identifier '%s.%s' using "
|
|
"pickle protocol %i" % (module, name, self.proto)) from None
|
|
|
|
self.memoize(obj)
|
|
|
|
def save_type(self, obj):
|
|
if obj is type(None):
|
|
return self.save_reduce(type, (None,), obj=obj)
|
|
elif obj is type(NotImplemented):
|
|
return self.save_reduce(type, (NotImplemented,), obj=obj)
|
|
elif obj is type(...):
|
|
return self.save_reduce(type, (...,), obj=obj)
|
|
return self.save_global(obj)
|
|
|
|
dispatch[FunctionType] = save_global
|
|
dispatch[type] = save_type
|
|
|
|
|
|
# Unpickling machinery
|
|
|
|
class _Unpickler:
|
|
|
|
def __init__(self, file, *, fix_imports=True,
|
|
encoding="ASCII", errors="strict", buffers=None):
|
|
"""This takes a binary file for reading a pickle data stream.
|
|
|
|
The protocol version of the pickle is detected automatically, so
|
|
no proto argument is needed.
|
|
|
|
The argument *file* must have two methods, a read() method that
|
|
takes an integer argument, and a readline() method that requires
|
|
no arguments. Both methods should return bytes. Thus *file*
|
|
can be a binary file object opened for reading, an io.BytesIO
|
|
object, or any other custom object that meets this interface.
|
|
|
|
The file-like object must have two methods, a read() method
|
|
that takes an integer argument, and a readline() method that
|
|
requires no arguments. Both methods should return bytes.
|
|
Thus file-like object can be a binary file object opened for
|
|
reading, a BytesIO object, or any other custom object that
|
|
meets this interface.
|
|
|
|
If *buffers* is not None, it should be an iterable of buffer-enabled
|
|
objects that is consumed each time the pickle stream references
|
|
an out-of-band buffer view. Such buffers have been given in order
|
|
to the *buffer_callback* of a Pickler object.
|
|
|
|
If *buffers* is None (the default), then the buffers are taken
|
|
from the pickle stream, assuming they are serialized there.
|
|
It is an error for *buffers* to be None if the pickle stream
|
|
was produced with a non-None *buffer_callback*.
|
|
|
|
Other optional arguments are *fix_imports*, *encoding* and
|
|
*errors*, which are used to control compatibility support for
|
|
pickle stream generated by Python 2. If *fix_imports* is True,
|
|
pickle will try to map the old Python 2 names to the new names
|
|
used in Python 3. The *encoding* and *errors* tell pickle how
|
|
to decode 8-bit string instances pickled by Python 2; these
|
|
default to 'ASCII' and 'strict', respectively. *encoding* can be
|
|
'bytes' to read these 8-bit string instances as bytes objects.
|
|
"""
|
|
self._buffers = iter(buffers) if buffers is not None else None
|
|
self._file_readline = file.readline
|
|
self._file_read = file.read
|
|
self.memo = {}
|
|
self.encoding = encoding
|
|
self.errors = errors
|
|
self.proto = 0
|
|
self.fix_imports = fix_imports
|
|
|
|
def load(self):
|
|
"""Read a pickled object representation from the open file.
|
|
|
|
Return the reconstituted object hierarchy specified in the file.
|
|
"""
|
|
# Check whether Unpickler was initialized correctly. This is
|
|
# only needed to mimic the behavior of _pickle.Unpickler.dump().
|
|
if not hasattr(self, "_file_read"):
|
|
raise UnpicklingError("Unpickler.__init__() was not called by "
|
|
"%s.__init__()" % (self.__class__.__name__,))
|
|
self._unframer = _Unframer(self._file_read, self._file_readline)
|
|
self.read = self._unframer.read
|
|
self.readinto = self._unframer.readinto
|
|
self.readline = self._unframer.readline
|
|
self.metastack = []
|
|
self.stack = []
|
|
self.append = self.stack.append
|
|
self.proto = 0
|
|
read = self.read
|
|
dispatch = self.dispatch
|
|
try:
|
|
while True:
|
|
key = read(1)
|
|
if not key:
|
|
raise EOFError
|
|
assert isinstance(key, bytes_types)
|
|
dispatch[key[0]](self)
|
|
except _Stop as stopinst:
|
|
return stopinst.value
|
|
|
|
# Return a list of items pushed in the stack after last MARK instruction.
|
|
def pop_mark(self):
|
|
items = self.stack
|
|
self.stack = self.metastack.pop()
|
|
self.append = self.stack.append
|
|
return items
|
|
|
|
def persistent_load(self, pid):
|
|
raise UnpicklingError("unsupported persistent id encountered")
|
|
|
|
dispatch = {}
|
|
|
|
def load_proto(self):
|
|
proto = self.read(1)[0]
|
|
if not 0 <= proto <= HIGHEST_PROTOCOL:
|
|
raise ValueError("unsupported pickle protocol: %d" % proto)
|
|
self.proto = proto
|
|
dispatch[PROTO[0]] = load_proto
|
|
|
|
def load_frame(self):
|
|
frame_size, = unpack('<Q', self.read(8))
|
|
if frame_size > sys.maxsize:
|
|
raise ValueError("frame size > sys.maxsize: %d" % frame_size)
|
|
self._unframer.load_frame(frame_size)
|
|
dispatch[FRAME[0]] = load_frame
|
|
|
|
def load_persid(self):
|
|
try:
|
|
pid = self.readline()[:-1].decode("ascii")
|
|
except UnicodeDecodeError:
|
|
raise UnpicklingError(
|
|
"persistent IDs in protocol 0 must be ASCII strings")
|
|
self.append(self.persistent_load(pid))
|
|
dispatch[PERSID[0]] = load_persid
|
|
|
|
def load_binpersid(self):
|
|
pid = self.stack.pop()
|
|
self.append(self.persistent_load(pid))
|
|
dispatch[BINPERSID[0]] = load_binpersid
|
|
|
|
def load_none(self):
|
|
self.append(None)
|
|
dispatch[NONE[0]] = load_none
|
|
|
|
def load_false(self):
|
|
self.append(False)
|
|
dispatch[NEWFALSE[0]] = load_false
|
|
|
|
def load_true(self):
|
|
self.append(True)
|
|
dispatch[NEWTRUE[0]] = load_true
|
|
|
|
def load_int(self):
|
|
data = self.readline()
|
|
if data == FALSE[1:]:
|
|
val = False
|
|
elif data == TRUE[1:]:
|
|
val = True
|
|
else:
|
|
val = int(data, 0)
|
|
self.append(val)
|
|
dispatch[INT[0]] = load_int
|
|
|
|
def load_binint(self):
|
|
self.append(unpack('<i', self.read(4))[0])
|
|
dispatch[BININT[0]] = load_binint
|
|
|
|
def load_binint1(self):
|
|
self.append(self.read(1)[0])
|
|
dispatch[BININT1[0]] = load_binint1
|
|
|
|
def load_binint2(self):
|
|
self.append(unpack('<H', self.read(2))[0])
|
|
dispatch[BININT2[0]] = load_binint2
|
|
|
|
def load_long(self):
|
|
val = self.readline()[:-1]
|
|
if val and val[-1] == b'L'[0]:
|
|
val = val[:-1]
|
|
self.append(int(val, 0))
|
|
dispatch[LONG[0]] = load_long
|
|
|
|
def load_long1(self):
|
|
n = self.read(1)[0]
|
|
data = self.read(n)
|
|
self.append(decode_long(data))
|
|
dispatch[LONG1[0]] = load_long1
|
|
|
|
def load_long4(self):
|
|
n, = unpack('<i', self.read(4))
|
|
if n < 0:
|
|
# Corrupt or hostile pickle -- we never write one like this
|
|
raise UnpicklingError("LONG pickle has negative byte count")
|
|
data = self.read(n)
|
|
self.append(decode_long(data))
|
|
dispatch[LONG4[0]] = load_long4
|
|
|
|
def load_float(self):
|
|
self.append(float(self.readline()[:-1]))
|
|
dispatch[FLOAT[0]] = load_float
|
|
|
|
def load_binfloat(self):
|
|
self.append(unpack('>d', self.read(8))[0])
|
|
dispatch[BINFLOAT[0]] = load_binfloat
|
|
|
|
def _decode_string(self, value):
|
|
# Used to allow strings from Python 2 to be decoded either as
|
|
# bytes or Unicode strings. This should be used only with the
|
|
# STRING, BINSTRING and SHORT_BINSTRING opcodes.
|
|
if self.encoding == "bytes":
|
|
return value
|
|
else:
|
|
return value.decode(self.encoding, self.errors)
|
|
|
|
def load_string(self):
|
|
data = self.readline()[:-1]
|
|
# Strip outermost quotes
|
|
if len(data) >= 2 and data[0] == data[-1] and data[0] in b'"\'':
|
|
data = data[1:-1]
|
|
else:
|
|
raise UnpicklingError("the STRING opcode argument must be quoted")
|
|
self.append(self._decode_string(codecs.escape_decode(data)[0]))
|
|
dispatch[STRING[0]] = load_string
|
|
|
|
def load_binstring(self):
|
|
# Deprecated BINSTRING uses signed 32-bit length
|
|
len, = unpack('<i', self.read(4))
|
|
if len < 0:
|
|
raise UnpicklingError("BINSTRING pickle has negative byte count")
|
|
data = self.read(len)
|
|
self.append(self._decode_string(data))
|
|
dispatch[BINSTRING[0]] = load_binstring
|
|
|
|
def load_binbytes(self):
|
|
len, = unpack('<I', self.read(4))
|
|
if len > maxsize:
|
|
raise UnpicklingError("BINBYTES exceeds system's maximum size "
|
|
"of %d bytes" % maxsize)
|
|
self.append(self.read(len))
|
|
dispatch[BINBYTES[0]] = load_binbytes
|
|
|
|
def load_unicode(self):
|
|
self.append(str(self.readline()[:-1], 'raw-unicode-escape'))
|
|
dispatch[UNICODE[0]] = load_unicode
|
|
|
|
def load_binunicode(self):
|
|
len, = unpack('<I', self.read(4))
|
|
if len > maxsize:
|
|
raise UnpicklingError("BINUNICODE exceeds system's maximum size "
|
|
"of %d bytes" % maxsize)
|
|
self.append(str(self.read(len), 'utf-8', 'surrogatepass'))
|
|
dispatch[BINUNICODE[0]] = load_binunicode
|
|
|
|
def load_binunicode8(self):
|
|
len, = unpack('<Q', self.read(8))
|
|
if len > maxsize:
|
|
raise UnpicklingError("BINUNICODE8 exceeds system's maximum size "
|
|
"of %d bytes" % maxsize)
|
|
self.append(str(self.read(len), 'utf-8', 'surrogatepass'))
|
|
dispatch[BINUNICODE8[0]] = load_binunicode8
|
|
|
|
def load_binbytes8(self):
|
|
len, = unpack('<Q', self.read(8))
|
|
if len > maxsize:
|
|
raise UnpicklingError("BINBYTES8 exceeds system's maximum size "
|
|
"of %d bytes" % maxsize)
|
|
self.append(self.read(len))
|
|
dispatch[BINBYTES8[0]] = load_binbytes8
|
|
|
|
def load_bytearray8(self):
|
|
len, = unpack('<Q', self.read(8))
|
|
if len > maxsize:
|
|
raise UnpicklingError("BYTEARRAY8 exceeds system's maximum size "
|
|
"of %d bytes" % maxsize)
|
|
b = bytearray(len)
|
|
self.readinto(b)
|
|
self.append(b)
|
|
dispatch[BYTEARRAY8[0]] = load_bytearray8
|
|
|
|
def load_next_buffer(self):
|
|
if self._buffers is None:
|
|
raise UnpicklingError("pickle stream refers to out-of-band data "
|
|
"but no *buffers* argument was given")
|
|
try:
|
|
buf = next(self._buffers)
|
|
except StopIteration:
|
|
raise UnpicklingError("not enough out-of-band buffers")
|
|
self.append(buf)
|
|
dispatch[NEXT_BUFFER[0]] = load_next_buffer
|
|
|
|
def load_readonly_buffer(self):
|
|
buf = self.stack[-1]
|
|
with memoryview(buf) as m:
|
|
if not m.readonly:
|
|
self.stack[-1] = m.toreadonly()
|
|
dispatch[READONLY_BUFFER[0]] = load_readonly_buffer
|
|
|
|
def load_short_binstring(self):
|
|
len = self.read(1)[0]
|
|
data = self.read(len)
|
|
self.append(self._decode_string(data))
|
|
dispatch[SHORT_BINSTRING[0]] = load_short_binstring
|
|
|
|
def load_short_binbytes(self):
|
|
len = self.read(1)[0]
|
|
self.append(self.read(len))
|
|
dispatch[SHORT_BINBYTES[0]] = load_short_binbytes
|
|
|
|
def load_short_binunicode(self):
|
|
len = self.read(1)[0]
|
|
self.append(str(self.read(len), 'utf-8', 'surrogatepass'))
|
|
dispatch[SHORT_BINUNICODE[0]] = load_short_binunicode
|
|
|
|
def load_tuple(self):
|
|
items = self.pop_mark()
|
|
self.append(tuple(items))
|
|
dispatch[TUPLE[0]] = load_tuple
|
|
|
|
def load_empty_tuple(self):
|
|
self.append(())
|
|
dispatch[EMPTY_TUPLE[0]] = load_empty_tuple
|
|
|
|
def load_tuple1(self):
|
|
self.stack[-1] = (self.stack[-1],)
|
|
dispatch[TUPLE1[0]] = load_tuple1
|
|
|
|
def load_tuple2(self):
|
|
self.stack[-2:] = [(self.stack[-2], self.stack[-1])]
|
|
dispatch[TUPLE2[0]] = load_tuple2
|
|
|
|
def load_tuple3(self):
|
|
self.stack[-3:] = [(self.stack[-3], self.stack[-2], self.stack[-1])]
|
|
dispatch[TUPLE3[0]] = load_tuple3
|
|
|
|
def load_empty_list(self):
|
|
self.append([])
|
|
dispatch[EMPTY_LIST[0]] = load_empty_list
|
|
|
|
def load_empty_dictionary(self):
|
|
self.append({})
|
|
dispatch[EMPTY_DICT[0]] = load_empty_dictionary
|
|
|
|
def load_empty_set(self):
|
|
self.append(set())
|
|
dispatch[EMPTY_SET[0]] = load_empty_set
|
|
|
|
def load_frozenset(self):
|
|
items = self.pop_mark()
|
|
self.append(frozenset(items))
|
|
dispatch[FROZENSET[0]] = load_frozenset
|
|
|
|
def load_list(self):
|
|
items = self.pop_mark()
|
|
self.append(items)
|
|
dispatch[LIST[0]] = load_list
|
|
|
|
def load_dict(self):
|
|
items = self.pop_mark()
|
|
d = {items[i]: items[i+1]
|
|
for i in range(0, len(items), 2)}
|
|
self.append(d)
|
|
dispatch[DICT[0]] = load_dict
|
|
|
|
# INST and OBJ differ only in how they get a class object. It's not
|
|
# only sensible to do the rest in a common routine, the two routines
|
|
# previously diverged and grew different bugs.
|
|
# klass is the class to instantiate, and k points to the topmost mark
|
|
# object, following which are the arguments for klass.__init__.
|
|
def _instantiate(self, klass, args):
|
|
if (args or not isinstance(klass, type) or
|
|
hasattr(klass, "__getinitargs__")):
|
|
try:
|
|
value = klass(*args)
|
|
except TypeError as err:
|
|
raise TypeError("in constructor for %s: %s" %
|
|
(klass.__name__, str(err)), err.__traceback__)
|
|
else:
|
|
value = klass.__new__(klass)
|
|
self.append(value)
|
|
|
|
def load_inst(self):
|
|
module = self.readline()[:-1].decode("ascii")
|
|
name = self.readline()[:-1].decode("ascii")
|
|
klass = self.find_class(module, name)
|
|
self._instantiate(klass, self.pop_mark())
|
|
dispatch[INST[0]] = load_inst
|
|
|
|
def load_obj(self):
|
|
# Stack is ... markobject classobject arg1 arg2 ...
|
|
args = self.pop_mark()
|
|
cls = args.pop(0)
|
|
self._instantiate(cls, args)
|
|
dispatch[OBJ[0]] = load_obj
|
|
|
|
def load_newobj(self):
|
|
args = self.stack.pop()
|
|
cls = self.stack.pop()
|
|
obj = cls.__new__(cls, *args)
|
|
self.append(obj)
|
|
dispatch[NEWOBJ[0]] = load_newobj
|
|
|
|
def load_newobj_ex(self):
|
|
kwargs = self.stack.pop()
|
|
args = self.stack.pop()
|
|
cls = self.stack.pop()
|
|
obj = cls.__new__(cls, *args, **kwargs)
|
|
self.append(obj)
|
|
dispatch[NEWOBJ_EX[0]] = load_newobj_ex
|
|
|
|
def load_global(self):
|
|
module = self.readline()[:-1].decode("utf-8")
|
|
name = self.readline()[:-1].decode("utf-8")
|
|
klass = self.find_class(module, name)
|
|
self.append(klass)
|
|
dispatch[GLOBAL[0]] = load_global
|
|
|
|
def load_stack_global(self):
|
|
name = self.stack.pop()
|
|
module = self.stack.pop()
|
|
if type(name) is not str or type(module) is not str:
|
|
raise UnpicklingError("STACK_GLOBAL requires str")
|
|
self.append(self.find_class(module, name))
|
|
dispatch[STACK_GLOBAL[0]] = load_stack_global
|
|
|
|
def load_ext1(self):
|
|
code = self.read(1)[0]
|
|
self.get_extension(code)
|
|
dispatch[EXT1[0]] = load_ext1
|
|
|
|
def load_ext2(self):
|
|
code, = unpack('<H', self.read(2))
|
|
self.get_extension(code)
|
|
dispatch[EXT2[0]] = load_ext2
|
|
|
|
def load_ext4(self):
|
|
code, = unpack('<i', self.read(4))
|
|
self.get_extension(code)
|
|
dispatch[EXT4[0]] = load_ext4
|
|
|
|
def get_extension(self, code):
|
|
nil = []
|
|
obj = _extension_cache.get(code, nil)
|
|
if obj is not nil:
|
|
self.append(obj)
|
|
return
|
|
key = _inverted_registry.get(code)
|
|
if not key:
|
|
if code <= 0: # note that 0 is forbidden
|
|
# Corrupt or hostile pickle.
|
|
raise UnpicklingError("EXT specifies code <= 0")
|
|
raise ValueError("unregistered extension code %d" % code)
|
|
obj = self.find_class(*key)
|
|
_extension_cache[code] = obj
|
|
self.append(obj)
|
|
|
|
def find_class(self, module, name):
|
|
# Subclasses may override this.
|
|
sys.audit('pickle.find_class', module, name)
|
|
if self.proto < 3 and self.fix_imports:
|
|
if (module, name) in _compat_pickle.NAME_MAPPING:
|
|
module, name = _compat_pickle.NAME_MAPPING[(module, name)]
|
|
elif module in _compat_pickle.IMPORT_MAPPING:
|
|
module = _compat_pickle.IMPORT_MAPPING[module]
|
|
__import__(module, level=0)
|
|
if self.proto >= 4:
|
|
return _getattribute(sys.modules[module], name)[0]
|
|
else:
|
|
return getattr(sys.modules[module], name)
|
|
|
|
def load_reduce(self):
|
|
stack = self.stack
|
|
args = stack.pop()
|
|
func = stack[-1]
|
|
stack[-1] = func(*args)
|
|
dispatch[REDUCE[0]] = load_reduce
|
|
|
|
def load_pop(self):
|
|
if self.stack:
|
|
del self.stack[-1]
|
|
else:
|
|
self.pop_mark()
|
|
dispatch[POP[0]] = load_pop
|
|
|
|
def load_pop_mark(self):
|
|
self.pop_mark()
|
|
dispatch[POP_MARK[0]] = load_pop_mark
|
|
|
|
def load_dup(self):
|
|
self.append(self.stack[-1])
|
|
dispatch[DUP[0]] = load_dup
|
|
|
|
def load_get(self):
|
|
i = int(self.readline()[:-1])
|
|
try:
|
|
self.append(self.memo[i])
|
|
except KeyError:
|
|
msg = f'Memo value not found at index {i}'
|
|
raise UnpicklingError(msg) from None
|
|
dispatch[GET[0]] = load_get
|
|
|
|
def load_binget(self):
|
|
i = self.read(1)[0]
|
|
try:
|
|
self.append(self.memo[i])
|
|
except KeyError as exc:
|
|
msg = f'Memo value not found at index {i}'
|
|
raise UnpicklingError(msg) from None
|
|
dispatch[BINGET[0]] = load_binget
|
|
|
|
def load_long_binget(self):
|
|
i, = unpack('<I', self.read(4))
|
|
try:
|
|
self.append(self.memo[i])
|
|
except KeyError as exc:
|
|
msg = f'Memo value not found at index {i}'
|
|
raise UnpicklingError(msg) from None
|
|
dispatch[LONG_BINGET[0]] = load_long_binget
|
|
|
|
def load_put(self):
|
|
i = int(self.readline()[:-1])
|
|
if i < 0:
|
|
raise ValueError("negative PUT argument")
|
|
self.memo[i] = self.stack[-1]
|
|
dispatch[PUT[0]] = load_put
|
|
|
|
def load_binput(self):
|
|
i = self.read(1)[0]
|
|
if i < 0:
|
|
raise ValueError("negative BINPUT argument")
|
|
self.memo[i] = self.stack[-1]
|
|
dispatch[BINPUT[0]] = load_binput
|
|
|
|
def load_long_binput(self):
|
|
i, = unpack('<I', self.read(4))
|
|
if i > maxsize:
|
|
raise ValueError("negative LONG_BINPUT argument")
|
|
self.memo[i] = self.stack[-1]
|
|
dispatch[LONG_BINPUT[0]] = load_long_binput
|
|
|
|
def load_memoize(self):
|
|
memo = self.memo
|
|
memo[len(memo)] = self.stack[-1]
|
|
dispatch[MEMOIZE[0]] = load_memoize
|
|
|
|
def load_append(self):
|
|
stack = self.stack
|
|
value = stack.pop()
|
|
list = stack[-1]
|
|
list.append(value)
|
|
dispatch[APPEND[0]] = load_append
|
|
|
|
def load_appends(self):
|
|
items = self.pop_mark()
|
|
list_obj = self.stack[-1]
|
|
try:
|
|
extend = list_obj.extend
|
|
except AttributeError:
|
|
pass
|
|
else:
|
|
extend(items)
|
|
return
|
|
# Even if the PEP 307 requires extend() and append() methods,
|
|
# fall back on append() if the object has no extend() method
|
|
# for backward compatibility.
|
|
append = list_obj.append
|
|
for item in items:
|
|
append(item)
|
|
dispatch[APPENDS[0]] = load_appends
|
|
|
|
def load_setitem(self):
|
|
stack = self.stack
|
|
value = stack.pop()
|
|
key = stack.pop()
|
|
dict = stack[-1]
|
|
dict[key] = value
|
|
dispatch[SETITEM[0]] = load_setitem
|
|
|
|
def load_setitems(self):
|
|
items = self.pop_mark()
|
|
dict = self.stack[-1]
|
|
for i in range(0, len(items), 2):
|
|
dict[items[i]] = items[i + 1]
|
|
dispatch[SETITEMS[0]] = load_setitems
|
|
|
|
def load_additems(self):
|
|
items = self.pop_mark()
|
|
set_obj = self.stack[-1]
|
|
if isinstance(set_obj, set):
|
|
set_obj.update(items)
|
|
else:
|
|
add = set_obj.add
|
|
for item in items:
|
|
add(item)
|
|
dispatch[ADDITEMS[0]] = load_additems
|
|
|
|
def load_build(self):
|
|
stack = self.stack
|
|
state = stack.pop()
|
|
inst = stack[-1]
|
|
setstate = getattr(inst, "__setstate__", _NoValue)
|
|
if setstate is not _NoValue:
|
|
setstate(state)
|
|
return
|
|
slotstate = None
|
|
if isinstance(state, tuple) and len(state) == 2:
|
|
state, slotstate = state
|
|
if state:
|
|
inst_dict = inst.__dict__
|
|
intern = sys.intern
|
|
for k, v in state.items():
|
|
if type(k) is str:
|
|
inst_dict[intern(k)] = v
|
|
else:
|
|
inst_dict[k] = v
|
|
if slotstate:
|
|
for k, v in slotstate.items():
|
|
setattr(inst, k, v)
|
|
dispatch[BUILD[0]] = load_build
|
|
|
|
def load_mark(self):
|
|
self.metastack.append(self.stack)
|
|
self.stack = []
|
|
self.append = self.stack.append
|
|
dispatch[MARK[0]] = load_mark
|
|
|
|
def load_stop(self):
|
|
value = self.stack.pop()
|
|
raise _Stop(value)
|
|
dispatch[STOP[0]] = load_stop
|
|
|
|
|
|
# Shorthands
|
|
|
|
def _dump(obj, file, protocol=None, *, fix_imports=True, buffer_callback=None):
|
|
_Pickler(file, protocol, fix_imports=fix_imports,
|
|
buffer_callback=buffer_callback).dump(obj)
|
|
|
|
def _dumps(obj, protocol=None, *, fix_imports=True, buffer_callback=None):
|
|
f = io.BytesIO()
|
|
_Pickler(f, protocol, fix_imports=fix_imports,
|
|
buffer_callback=buffer_callback).dump(obj)
|
|
res = f.getvalue()
|
|
assert isinstance(res, bytes_types)
|
|
return res
|
|
|
|
def _load(file, *, fix_imports=True, encoding="ASCII", errors="strict",
|
|
buffers=None):
|
|
return _Unpickler(file, fix_imports=fix_imports, buffers=buffers,
|
|
encoding=encoding, errors=errors).load()
|
|
|
|
def _loads(s, /, *, fix_imports=True, encoding="ASCII", errors="strict",
|
|
buffers=None):
|
|
if isinstance(s, str):
|
|
raise TypeError("Can't load pickle from unicode string")
|
|
file = io.BytesIO(s)
|
|
return _Unpickler(file, fix_imports=fix_imports, buffers=buffers,
|
|
encoding=encoding, errors=errors).load()
|
|
|
|
# Use the faster _pickle if possible
|
|
try:
|
|
from _pickle import (
|
|
PickleError,
|
|
PicklingError,
|
|
UnpicklingError,
|
|
Pickler,
|
|
Unpickler,
|
|
dump,
|
|
dumps,
|
|
load,
|
|
loads
|
|
)
|
|
except ImportError:
|
|
Pickler, Unpickler = _Pickler, _Unpickler
|
|
dump, dumps, load, loads = _dump, _dumps, _load, _loads
|
|
|
|
# Doctest
|
|
def _test():
|
|
import doctest
|
|
return doctest.testmod()
|
|
|
|
if __name__ == "__main__":
|
|
import argparse
|
|
parser = argparse.ArgumentParser(
|
|
description='display contents of the pickle files')
|
|
parser.add_argument(
|
|
'pickle_file', type=argparse.FileType('br'),
|
|
nargs='*', help='the pickle file')
|
|
parser.add_argument(
|
|
'-t', '--test', action='store_true',
|
|
help='run self-test suite')
|
|
parser.add_argument(
|
|
'-v', action='store_true',
|
|
help='run verbosely; only affects self-test run')
|
|
args = parser.parse_args()
|
|
if args.test:
|
|
_test()
|
|
else:
|
|
if not args.pickle_file:
|
|
parser.print_help()
|
|
else:
|
|
import pprint
|
|
for f in args.pickle_file:
|
|
obj = load(f)
|
|
pprint.pprint(obj)
|