[Python-Dev] How to fix the buffer object's broken char buffersupport

Kristján V. Jónsson kristjan at ccpgames.com
Wed Jun 7 11:37:38 CEST 2006

As a side note, It always seemed to me that the bf_getcharbuffer´s semantics were poorly defined.  At least in the 2.3 documentation.  Has that, and the need for it, changed recently?


-----Original Message-----
From: python-dev-bounces+kristjan=ccpgames.com at python.org [mailto:python-dev-bounces+kristjan=ccpgames.com at python.org] On Behalf Of Brett Cannon
Sent: 6. júní 2006 22:30
To: Python Dev
Subject: [Python-Dev] How to fix the buffer object's broken char buffersupport

If you run ``import array; int(buffer(array.array('c')))`` the interpreter will segfault.  While investigating this I discovered that buffer objects, for their tp_as_buffer->bf_getcharbuffer, return the result by calling the wrapped object bf_getreadbuffer or bf_getwritebuffer.  This is wrong since it is essentially redirecting the expected call to the wrong tp_as_buffer slot for the wrapped object.  Plus it doesn't have Py_TPFLAGS_HAVE_GETCHARBUFFER defined.

I see two options here.  One is to remove the bf_getcharbuffer slot from the buffer object.  The other option is to fix it so that it only returns bf_getcharbuffer and doesn't redirect improperly (this also brings up the issue if Py_TPFLAGS_HAVE_GETCHARBUFFER should then also be defined for buffer objects).

Since I don't use buffer objects I don't know if it is better to fix this or just rip it out.

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