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Added new private API function _PyLong_NumBits. This will be used at the

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start for the C implemention of new pickle LONG1 and LONG4 opcodes (the
linear-time way to pickle a long is to call _PyLong_AsByteArray, but
the caller has no idea how big an array to allocate, and correct
calculation is a bit subtle).
This commit is contained in:
Tim Peters 2003-01-28 20:37:45 +00:00
parent 3d8c01b31c
commit baefd9e552
3 changed files with 85 additions and 2 deletions
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11
Include/longobject.h
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@ -44,6 +44,17 @@ PyAPI_FUNC(PyObject *) PyLong_FromString(char *, char **, int);
PyAPI_FUNC(PyObject *) PyLong_FromUnicode(Py_UNICODE*, int, int);
#endif
/* _PyLong_NumBits. Return the number of bits needed to represent a long
in contiguous 2's-complement form, including 1 for the sign bit. For
example, this returns 1 for 0, and 2 for 1 and -1. Note that the
ceiling of this divided by 8 is the number of bytes needed by
_PyLong_AsByteArray to store the long in 256's-complement form.
v must not be NULL, and must be a normalized long.
(size_t)-1 is returned and OverflowError set if the true result doesn't
fit in a size_t.
*/
PyAPI_FUNC(size_t) _PyLong_NumBits(PyObject *v);
/* _PyLong_FromByteArray: View the n unsigned bytes as a binary integer in
base 256, and return a Python long with the same numeric value.
If n is 0, the integer is 0. Else: