diff options
Diffstat (limited to 'Include')
| -rw-r--r-- | Include/longobject.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/Include/longobject.h b/Include/longobject.h index 7ebceec..3c6fde0 100644 --- a/Include/longobject.h +++ b/Include/longobject.h @@ -44,6 +44,46 @@ extern DL_IMPORT(unsigned LONG_LONG) PyLong_AsUnsignedLongLong(PyObject *); DL_IMPORT(PyObject *) PyLong_FromString(char *, char **, int); DL_IMPORT(PyObject *) PyLong_FromUnicode(Py_UNICODE*, int, int); +/* _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: + If little_endian is 1/true, bytes[n-1] is the MSB and bytes[0] the LSB; + else (little_endian is 0/false) bytes[0] is the MSB and bytes[n-1] the + LSB. + If is_signed is 0/false, view the bytes as a non-negative integer. + If is_signed is 1/true, view the bytes as a 2's-complement integer, + non-negative if bit 0x80 of the MSB is clear, negative if set. + Error returns: + + Return NULL with the appropriate exception set if there's not + enough memory to create the Python long. +*/ +extern DL_IMPORT(PyObject *) _PyLong_FromByteArray( + const unsigned char* bytes, size_t n, + int little_endian, int is_signed); + +/* _PyLong_AsByteArray: Convert the least-significant 8*n bits of long + v to a base-256 integer, stored in array bytes. Normally return 0, + return -1 on error. + If little_endian is 1/true, store the MSB at bytes[n-1] and the LSB at + bytes[0]; else (little_endian is 0/false) store the MSB at bytes[0] and + the LSB at bytes[n-1]. + If is_signed is 0/false, it's an error if v < 0; else (v >= 0) n bytes + are filled and there's nothing special about bit 0x80 of the MSB. + If is_signed is 1/true, bytes is filled with the 2's-complement + representation of v's value. Bit 0x80 of the MSB is the sign bit. + Error returns (-1): + + is_signed is 0 and v < 0. TypeError is set in this case, and bytes + isn't altered. + + n isn't big enough to hold the full mathematical value of v. For + example, if is_signed is 0 and there are more digits in the v than + fit in n; or if is_signed is 1, v < 0, and n is just 1 bit shy of + being large enough to hold a sign bit. OverflowError is set in this + case, but bytes holds the least-signficant n bytes of the true value. +*/ +extern DL_IMPORT(int) _PyLong_AsByteArray(PyLongObject* v, + unsigned char* bytes, size_t n, + int little_endian, int is_signed); + #ifdef __cplusplus } #endif |