[pypy-dev] fail about resumable hashlib code under pypy

[KaShining]

Here is my test.py about resumable-hashlib:

from ctypes import *
import hashlib

PyObject_HEAD = [
    ('ob_refcnt', c_size_t),
    ('ob_type', c_void_p),
]

class EVP_MD(Structure):
    _fields_ = [
        ('type', c_int),
        ('pkey_type', c_int),
        ('md_size', c_int),
        ('flags', c_ulong),
        ('init', c_void_p),
        ('update', c_void_p),
        ('final', c_void_p),
        ('copy', c_void_p),
        ('cleanup', c_void_p),
        ('sign', c_void_p),
        ('verify', c_void_p),
        ('required_pkey_type', c_int*5),
        ('block_size', c_int),
        ('ctx_size', c_int),
    ]

class EVP_MD_CTX(Structure):
    _fields_ = [
        ('digest', POINTER(EVP_MD)),
        ('engine', c_void_p),
        ('flags', c_ulong),
        ('md_data', POINTER(c_char)),
    ]

class EVPobject(Structure):
    _fields_ = PyObject_HEAD + [
        ('name', py_object),
        ('ctx', EVP_MD_CTX),
    ]

#import string

#    str4096 = random_str(4096)
str4096 = 'sssss'

hash2 = hashlib.sha1()
c_evp_obj = cast(c_void_p(id(hash2)), POINTER(EVPobject)).contents
ctx = c_evp_obj.ctx
digest = ctx.digest.contents
state = ctx.md_data[:digest.ctx_size]
#print digest.ctx_size

Pass in cpython while fail in pypy:

Traceback (most recent call last):
  File "app_main.py", line 72, in run_toplevel
  File "t.py", line 49, in <module>
    digest = ctx.digest.contents
  File "/opt/pypy2.1/lib_pypy/_ctypes/pointer.py", line 83, in getcontents
    raise ValueError("NULL pointer access")
ValueError: NULL pointer access
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