this can work, but these days we have implemented hashlib differently., why?
On Fri, Nov 8, 2013 at 10:49 AM, KaShining <mail2sh...@qq.com> wrote: > Maybe this way can work: > https://bitbucket.org/pypy/pypy/src/cli-jit/pypy/lib/_hashlib.py?at=cli-jit > > > ------------------ 原始邮件 ------------------ > 发件人: "Maciej Fijalkowski";<fij...@gmail.com>; > 发送时间: 2013年11月8日(星期五) 下午4:47 > 收件人: "KaShining"<mail2sh...@qq.com>; > 抄送: "pypy-dev"<pypy-dev@python.org>; > 主题: Re: [pypy-dev] fail about resumable hashlib code under pypy > > PyPy objects are not implemented like this. This is an evil and > atrocious hack to get the refcount and pyobjects stuff from python > level using ctypes. works only on cpython. > > On Fri, Nov 8, 2013 at 10:02 AM, KaShining <mail2sh...@qq.com> wrote: >> 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 >> >> >> >> >> _______________________________________________ >> pypy-dev mailing list >> pypy-dev@python.org >> https://mail.python.org/mailman/listinfo/pypy-dev >> _______________________________________________ pypy-dev mailing list pypy-dev@python.org https://mail.python.org/mailman/listinfo/pypy-dev
