I had to make a slight diddle to work with Python 1.4, which
we and some of our customers are still using. :(
I've also made a few minor enhancements:
- You can now both get and set the memo using a 'memo'
attribute. This is handy for certain advanced applications
that we have.
- Added a 'binary' attribute to get and set the binary
mode for a pickler.
- Added a somewhat experimental 'fast' attribute. When this
is set, objects are not placed in the memo during pickling.
This should lead to faster pickling and smaller pickles in
cases where:
o you *know* there are no circular references, and
o either you've:
- preloaded the memo with class information
by pickling classes in non-fast mode or by
manipilating the memo directly, or
- aren't pickling instances.
1. Only DECREF the class's module when the module is retrieved via
PyImport_Import. If it is retrieved from the modules dictionary with
PyDict_GetItem, it is using a borrowed reference.
2. If the module doesn't define the desired class, raise the same
SystemError that pickle.py does instead of returning an AttributeError
(which is cryptic at best).
Also, fix the PyArg_ParseTuple in cpm_loads (the externally visible
loads) function: Use "S" instead of "O" because cStringIO will croak
with a "bad arguments to internal function" if passed anything other
than a string.
- Loading non-binary string pickles checks for insecure
strings. This is needed because cPickle (still)
uses a restricted eval to parse non-binary string pickles.
This change is needed to prevent untrusted
pickles like::
"S'hello world'*2000000\012p0\012."
from hosing an application.
- User-defined types can now support unpickling without
executing a constructor.
The second value returned from __reduce__ can now be None,
rather than an argument tuple. On unpickling, if the second
value returned from __reduce__ during pickling was None, then
rather than calling the first value returned from __reduce__,
directly, the __basicnew__ method of the first value returned
from __reduce__ is called without arguments.
- Quieted gcc -Wall by removing unused local variables.
- Added some choice parentheses around assignments in conditional
tests.
- Removed an unused (and seemingly unreachable) err label in
load_short_binstring().
- in Unpickler_load(), removed \. in string format.
- init_stuff() was declared to return an int, but had these
problems:
- it was returning NULL instead of 0 or 1 in some cases
- it was falling of the end of the routine without returning
anything
- the call of init_stuff() in initcPickle() was never checking
the return value anyway.
I changed all this by returning 1 in the case of errors, 0 when
no error occurred. Then in initcPickle(), if init_stuff()
returns non-zero, I call Py_FatalError().
Suppressing my urge to reformat according to Python coding standards!
:-)
Jeremy Hylton
Guido van Rossum
Fred Drake
Barry Warsaw