#ifndef Py_LONGINTREPR_H

#define Py_LONGINTREPR_H

#ifdef __cplusplus

extern "C" {

#endif

/* This is published for the benefit of "friend" marshal.c only. */

/* Parameters of the long integer representation.

   These shouldn't have to be changed as C should guarantee that a short

   contains at least 16 bits, but it's made changeable anyway.

   Note: 'digit' should be able to hold 2*MASK+1, and 'twodigits'

   should be able to hold the intermediate results in 'mul'

   (at most (BASE-1)*(2*BASE+1) == MASK*(2*MASK+3)).

   Also, x_sub assumes that 'digit' is an unsigned type, and overflow

   is handled by taking the result mod 2**N for some N > SHIFT.

   And, at some places it is assumed that MASK fits in an int, as well.

   long_pow() requires that SHIFT be divisible by 5. */

typedef unsigned short digit;

typedef unsigned int wdigit; /* digit widened to parameter size */

#define BASE_TWODIGITS_TYPE long

typedef unsigned BASE_TWODIGITS_TYPE twodigits;

typedef BASE_TWODIGITS_TYPE stwodigits; /* signed variant of twodigits */

#define SHIFT	15

#define BASE	((digit)1 << SHIFT)

#define MASK	((int)(BASE - 1))

#if SHIFT % 5 != 0

#error "longobject.c requires that SHIFT be divisible by 5"

#endif

/* Long integer representation.

   The absolute value of a number is equal to

   	SUM(for i=0 through abs(ob_size)-1) ob_digit[i] * 2**(SHIFT*i)

   Negative numbers are represented with ob_size < 0;

   zero is represented by ob_size == 0.

   In a normalized number, ob_digit[abs(ob_size)-1] (the most significant

   digit) is never zero.  Also, in all cases, for all valid i,

   	0 <= ob_digit[i] <= MASK.

   The allocation function takes care of allocating extra memory

   so that ob_digit[0] ... ob_digit[abs(ob_size)-1] are actually available.

   CAUTION:  Generic code manipulating subtypes of PyVarObject has to

   aware that longs abuse  ob_size's sign bit.

*/

struct _longobject {

	PyObject_VAR_HEAD

	digit ob_digit[1];

};

PyAPI_FUNC(PyLongObject *) _PyLong_New(Py_ssize_t);

/* Return a copy of src. */

PyAPI_FUNC(PyObject *) _PyLong_Copy(PyLongObject *src);

#ifdef __cplusplus

}

#endif

#endif /* !Py_LONGINTREPR_H */