STINNER Victor <[email protected]> added the comment:
> This is because the zero in seek(0) is a "cookie"
> which contains both the position and the decoder state.
> Unfortunately, state=0 means 'endianness has been determined:
> native order'.
The problem is maybe that TextIOWrapper._pack_cookie() can create a
cookie=0. Example to create a non-null value, replace:
def _pack_cookie(self, position, ...):
return (position | (dec_flags<<64) | ...
def _unpack_cookie(self, bigint):
rest, position = divmod(bigint, 1<<64)
...
by
def _pack_cookie(self, position, ...):
return (1 | (position<<1) | (dec_flags<<65) | ...
def _unpack_cookie(self, bigint):
if not (bigint & 1):
raise ValueError("invalid cookie")
bigint >>= 1
rest, position = divmod(bigint, 1<<64)
...
Why the cookie is an integer and not an object with attributes?
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Python tracker <[email protected]>
<http://bugs.python.org/issue4862>
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