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2a9b367385
_PyLong_FromByteArray
_PyLong_AsByteArray
Untested and probably buggy -- they compile OK, but nothing calls them
yet. Will soon be called by the struct module, to implement x-platform
'q' and 'Q'.
If other people have uses for them, we could move them into the public API.
See longobject.h for usage details.
90 lines
3.5 KiB
C
90 lines
3.5 KiB
C
#ifndef Py_LONGOBJECT_H
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#define Py_LONGOBJECT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Long (arbitrary precision) integer object interface */
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typedef struct _longobject PyLongObject; /* Revealed in longintrepr.h */
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extern DL_IMPORT(PyTypeObject) PyLong_Type;
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#define PyLong_Check(op) ((op)->ob_type == &PyLong_Type)
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extern DL_IMPORT(PyObject *) PyLong_FromLong(long);
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extern DL_IMPORT(PyObject *) PyLong_FromUnsignedLong(unsigned long);
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extern DL_IMPORT(PyObject *) PyLong_FromDouble(double);
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extern DL_IMPORT(long) PyLong_AsLong(PyObject *);
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extern DL_IMPORT(unsigned long) PyLong_AsUnsignedLong(PyObject *);
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extern DL_IMPORT(double) PyLong_AsDouble(PyObject *);
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extern DL_IMPORT(PyObject *) PyLong_FromVoidPtr(void *);
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extern DL_IMPORT(void *) PyLong_AsVoidPtr(PyObject *);
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#ifdef HAVE_LONG_LONG
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/* Hopefully this is portable... */
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#ifndef ULONG_MAX
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#define ULONG_MAX 4294967295U
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#endif
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#ifndef LONGLONG_MAX
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#define LONGLONG_MAX 9223372036854775807LL
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#endif
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#ifndef ULONGLONG_MAX
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#define ULONGLONG_MAX 0xffffffffffffffffULL
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#endif
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extern DL_IMPORT(PyObject *) PyLong_FromLongLong(LONG_LONG);
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extern DL_IMPORT(PyObject *) PyLong_FromUnsignedLongLong(unsigned LONG_LONG);
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extern DL_IMPORT(LONG_LONG) PyLong_AsLongLong(PyObject *);
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extern DL_IMPORT(unsigned LONG_LONG) PyLong_AsUnsignedLongLong(PyObject *);
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#endif /* HAVE_LONG_LONG */
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DL_IMPORT(PyObject *) PyLong_FromString(char *, char **, int);
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DL_IMPORT(PyObject *) PyLong_FromUnicode(Py_UNICODE*, int, int);
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/* _PyLong_FromByteArray: View the n unsigned bytes as a binary integer in
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base 256, and return a Python long with the same numeric value.
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If n is 0, the integer is 0. Else:
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If little_endian is 1/true, bytes[n-1] is the MSB and bytes[0] the LSB;
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else (little_endian is 0/false) bytes[0] is the MSB and bytes[n-1] the
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LSB.
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If is_signed is 0/false, view the bytes as a non-negative integer.
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If is_signed is 1/true, view the bytes as a 2's-complement integer,
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non-negative if bit 0x80 of the MSB is clear, negative if set.
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Error returns:
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+ Return NULL with the appropriate exception set if there's not
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enough memory to create the Python long.
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*/
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extern DL_IMPORT(PyObject *) _PyLong_FromByteArray(
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const unsigned char* bytes, size_t n,
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int little_endian, int is_signed);
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/* _PyLong_AsByteArray: Convert the least-significant 8*n bits of long
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v to a base-256 integer, stored in array bytes. Normally return 0,
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return -1 on error.
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If little_endian is 1/true, store the MSB at bytes[n-1] and the LSB at
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bytes[0]; else (little_endian is 0/false) store the MSB at bytes[0] and
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the LSB at bytes[n-1].
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If is_signed is 0/false, it's an error if v < 0; else (v >= 0) n bytes
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are filled and there's nothing special about bit 0x80 of the MSB.
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If is_signed is 1/true, bytes is filled with the 2's-complement
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representation of v's value. Bit 0x80 of the MSB is the sign bit.
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Error returns (-1):
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+ is_signed is 0 and v < 0. TypeError is set in this case, and bytes
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isn't altered.
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+ n isn't big enough to hold the full mathematical value of v. For
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example, if is_signed is 0 and there are more digits in the v than
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fit in n; or if is_signed is 1, v < 0, and n is just 1 bit shy of
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being large enough to hold a sign bit. OverflowError is set in this
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case, but bytes holds the least-signficant n bytes of the true value.
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*/
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extern DL_IMPORT(int) _PyLong_AsByteArray(PyLongObject* v,
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unsigned char* bytes, size_t n,
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int little_endian, int is_signed);
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_LONGOBJECT_H */
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