#ifndef Py_LIMITED_API
#ifndef Py_LONGINTREPR_H
#define Py_LONGINTREPR_H
#ifdef __cplusplus
extern "C" {
#endif


/* This is published for the benefit of "friends" marshal.c and _decimal.c. */

/* Parameters of the integer representation. There are two different
 sets of parameters: one set for 30-bit digits, stored in an unsigned 32-bit
 integer type, and one set for 15-bit digits with each digit stored in an
 unsigned short. The value of PYLONG_BITS_IN_DIGIT, defined either at
 configure time or in pyport.h, is used to decide which digit size to use.

 Type 'digit' should be able to hold 2*PyLong_BASE-1, and type 'twodigits'
 should be an unsigned integer type able to hold all integers up to
 PyLong_BASE*PyLong_BASE-1. x_sub assumes that 'digit' is an unsigned type,
 and that overflow is handled by taking the result modulo 2**N for some N >
 PyLong_SHIFT. The majority of the code doesn't care about the precise
 value of PyLong_SHIFT, but there are some notable exceptions:

 - long_pow() requires that PyLong_SHIFT be divisible by 5

 - PyLong_{As,From}ByteArray require that PyLong_SHIFT be at least 8

 - long_hash() requires that PyLong_SHIFT is *strictly* less than the number
 of bits in an unsigned long, as do the PyLong <-> long (or unsigned long)
 conversion functions

 - the Python int <-> size_t/Py_ssize_t conversion functions expect that
 PyLong_SHIFT is strictly less than the number of bits in a size_t

 - the marshal code currently expects that PyLong_SHIFT is a multiple of 15

 - NSMALLNEGINTS and NSMALLPOSINTS should be small enough to fit in a single
 digit; with the current values this forces PyLong_SHIFT >= 9

 The values 15 and 30 should fit all of the above requirements, on any
 platform.
*/

#if PYLONG_BITS_IN_DIGIT == 30
typedef uint32_t digit;
typedef int32_t sdigit; /* signed variant of digit */
typedef uint64_t twodigits;
typedef int64_t stwodigits; /* signed variant of twodigits */
#define PyLong_SHIFT 30
#define _PyLong_DECIMAL_SHIFT 9 /* max(e such that 10**e fits in a digit) */
#define _PyLong_DECIMAL_BASE ((digit)1000000000) /* 10 ** DECIMAL_SHIFT */
#elif PYLONG_BITS_IN_DIGIT == 15
typedef unsigned short digit;
typedef short sdigit; /* signed variant of digit */
typedef unsigned long twodigits;
typedef long stwodigits; /* signed variant of twodigits */
#define PyLong_SHIFT 15
#define _PyLong_DECIMAL_SHIFT 4 /* max(e such that 10**e fits in a digit) */
#define _PyLong_DECIMAL_BASE ((digit)10000) /* 10 ** DECIMAL_SHIFT */
#else
#error "PYLONG_BITS_IN_DIGIT should be 15 or 30"
#endif
#define PyLong_BASE ((digit)1 << PyLong_SHIFT)
#define PyLong_MASK ((digit)(PyLong_BASE - 1))

#if PyLong_SHIFT % 5 != 0
#error "longobject.c requires that PyLong_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 ints 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 */
#endif /* Py_LIMITED_API */