1 #ifndef Py_LONGOBJECT_H

     2 #define Py_LONGOBJECT_H

     3 #ifdef __cplusplus

     4 extern "C" {

     5 #endif

     6 

     7 

     8 /* Long (arbitrary precision) integer object interface */

     9 

    10 typedef struct _longobject PyLongObject; /* Revealed in longintrepr.h */

    11 

    12 PyAPI_DATA(PyTypeObject) PyLong_Type;

    13 

    14 #define PyLong_Check(op) PyObject_TypeCheck(op, &PyLong_Type)

    15 #define PyLong_CheckExact(op) ((op)->ob_type == &PyLong_Type)

    16 

    17 PyAPI_FUNC(PyObject *) PyLong_FromLong(long);

    18 PyAPI_FUNC(PyObject *) PyLong_FromUnsignedLong(unsigned long);

    19 PyAPI_FUNC(PyObject *) PyLong_FromDouble(double);

    20 PyAPI_FUNC(long) PyLong_AsLong(PyObject *);

    21 PyAPI_FUNC(unsigned long) PyLong_AsUnsignedLong(PyObject *);

    22 PyAPI_FUNC(unsigned long) PyLong_AsUnsignedLongMask(PyObject *);

    23 

    24 /* For use by intobject.c only */

    25 PyAPI_FUNC(Py_ssize_t) _PyLong_AsSsize_t(PyObject *);

    26 PyAPI_FUNC(PyObject *) _PyLong_FromSize_t(size_t);

    27 PyAPI_FUNC(PyObject *) _PyLong_FromSsize_t(Py_ssize_t);

    28 PyAPI_DATA(int) _PyLong_DigitValue[256];

    29 

    30 /* _PyLong_AsScaledDouble returns a double x and an exponent e such that

    31    the true value is approximately equal to x * 2**(SHIFT*e).  e is >= 0.

    32    x is 0.0 if and only if the input is 0 (in which case, e and x are both

    33    zeroes).  Overflow is impossible.  Note that the exponent returned must

    34    be multiplied by SHIFT!  There may not be enough room in an int to store

    35    e*SHIFT directly. */

    36 PyAPI_FUNC(double) _PyLong_AsScaledDouble(PyObject *vv, int *e);

    37 

    38 PyAPI_FUNC(double) PyLong_AsDouble(PyObject *);

    39 PyAPI_FUNC(PyObject *) PyLong_FromVoidPtr(void *);

    40 PyAPI_FUNC(void *) PyLong_AsVoidPtr(PyObject *);

    41 

    42 #ifdef HAVE_LONG_LONG

    43 PyAPI_FUNC(PyObject *) PyLong_FromLongLong(PY_LONG_LONG);

    44 PyAPI_FUNC(PyObject *) PyLong_FromUnsignedLongLong(unsigned PY_LONG_LONG);

    45 PyAPI_FUNC(PY_LONG_LONG) PyLong_AsLongLong(PyObject *);

    46 PyAPI_FUNC(unsigned PY_LONG_LONG) PyLong_AsUnsignedLongLong(PyObject *);

    47 PyAPI_FUNC(unsigned PY_LONG_LONG) PyLong_AsUnsignedLongLongMask(PyObject *);

    48 #endif /* HAVE_LONG_LONG */

    49 

    50 PyAPI_FUNC(PyObject *) PyLong_FromString(char *, char **, int);

    51 #ifdef Py_USING_UNICODE

    52 PyAPI_FUNC(PyObject *) PyLong_FromUnicode(Py_UNICODE*, Py_ssize_t, int);

    53 #endif

    54 

    55 /* _PyLong_Sign.  Return 0 if v is 0, -1 if v < 0, +1 if v > 0.

    56    v must not be NULL, and must be a normalized long.

    57    There are no error cases.

    58 */

    59 PyAPI_FUNC(int) _PyLong_Sign(PyObject *v);

    60 

    61 

    62 /* _PyLong_NumBits.  Return the number of bits needed to represent the

    63    absolute value of a long.  For example, this returns 1 for 1 and -1, 2

    64    for 2 and -2, and 2 for 3 and -3.  It returns 0 for 0.

    65    v must not be NULL, and must be a normalized long.

    66    (size_t)-1 is returned and OverflowError set if the true result doesn't

    67    fit in a size_t.

    68 */

    69 PyAPI_FUNC(size_t) _PyLong_NumBits(PyObject *v);

    70 

    71 /* _PyLong_FromByteArray:  View the n unsigned bytes as a binary integer in

    72    base 256, and return a Python long with the same numeric value.

    73    If n is 0, the integer is 0.  Else:

    74    If little_endian is 1/true, bytes[n-1] is the MSB and bytes[0] the LSB;

    75    else (little_endian is 0/false) bytes[0] is the MSB and bytes[n-1] the

    76    LSB.

    77    If is_signed is 0/false, view the bytes as a non-negative integer.

    78    If is_signed is 1/true, view the bytes as a 2's-complement integer,

    79    non-negative if bit 0x80 of the MSB is clear, negative if set.

    80    Error returns:

    81    + Return NULL with the appropriate exception set if there's not

    82      enough memory to create the Python long.

    83 */

    84 PyAPI_FUNC(PyObject *) _PyLong_FromByteArray(

    85 	const unsigned char* bytes, size_t n,

    86 	int little_endian, int is_signed);

    87 

    88 /* _PyLong_AsByteArray: Convert the least-significant 8*n bits of long

    89    v to a base-256 integer, stored in array bytes.  Normally return 0,

    90    return -1 on error.

    91    If little_endian is 1/true, store the MSB at bytes[n-1] and the LSB at

    92    bytes[0]; else (little_endian is 0/false) store the MSB at bytes[0] and

    93    the LSB at bytes[n-1].

    94    If is_signed is 0/false, it's an error if v < 0; else (v >= 0) n bytes

    95    are filled and there's nothing special about bit 0x80 of the MSB.

    96    If is_signed is 1/true, bytes is filled with the 2's-complement

    97    representation of v's value.  Bit 0x80 of the MSB is the sign bit.

    98    Error returns (-1):

    99    + is_signed is 0 and v < 0.  TypeError is set in this case, and bytes

   100      isn't altered.

   101    + n isn't big enough to hold the full mathematical value of v.  For

   102      example, if is_signed is 0 and there are more digits in the v than

   103      fit in n; or if is_signed is 1, v < 0, and n is just 1 bit shy of

   104      being large enough to hold a sign bit.  OverflowError is set in this

   105      case, but bytes holds the least-signficant n bytes of the true value.

   106 */

   107 PyAPI_FUNC(int) _PyLong_AsByteArray(PyLongObject* v,

   108 	unsigned char* bytes, size_t n,

   109 	int little_endian, int is_signed);

   110 

   111 #ifdef __cplusplus

   112 }

   113 #endif

   114 #endif /* !Py_LONGOBJECT_H */