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bpo-46906: Add PyFloat_Pack8() to the C API (GH-31657)

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Add new functions to pack and unpack C double (serialize and
deserialize):

* PyFloat_Pack2(), PyFloat_Pack4(), PyFloat_Pack8()
* PyFloat_Unpack2(), PyFloat_Unpack4(), PyFloat_Unpack8()

Document these functions and add unit tests.

Rename private functions and move them from the internal C API
to the public C API:

* _PyFloat_Pack2() => PyFloat_Pack2()
* _PyFloat_Pack4() => PyFloat_Pack4()
* _PyFloat_Pack8() => PyFloat_Pack8()
* _PyFloat_Unpack2() => PyFloat_Unpack2()
* _PyFloat_Unpack4() => PyFloat_Unpack4()
* _PyFloat_Unpack8() => PyFloat_Unpack8()

Replace the "unsigned char*" type with "char*" which is more common
and easy to use.
This commit is contained in:
Victor Stinner 2022-03-12 00:10:02 +01:00 • committed by GitHub
parent ecfff63e06
commit 882d8096c2
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GPG key ID: 4AEE18F83AFDEB23
13 changed files with 294 additions and 91 deletions
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11
Modules/arraymodule.c
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@ -9,7 +9,6 @@
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#include "pycore_floatobject.h" // _PyFloat_Unpack4()
#include "pycore_moduleobject.h" // _PyModule_GetState()
#include "structmember.h" // PyMemberDef
#include <stddef.h> // offsetof()
@ -2056,15 +2055,14 @@ array__array_reconstructor_impl(PyObject *module, PyTypeObject *arraytype,
Py_ssize_t i;
int le = (mformat_code == IEEE_754_FLOAT_LE) ? 1 : 0;
Py_ssize_t itemcount = Py_SIZE(items) / 4;
const unsigned char *memstr =
(unsigned char *)PyBytes_AS_STRING(items);
const char *memstr = PyBytes_AS_STRING(items);
converted_items = PyList_New(itemcount);
if (converted_items == NULL)
return NULL;
for (i = 0; i < itemcount; i++) {
PyObject *pyfloat = PyFloat_FromDouble(
_PyFloat_Unpack4(&memstr[i * 4], le));
PyFloat_Unpack4(&memstr[i * 4], le));
if (pyfloat == NULL) {
Py_DECREF(converted_items);
return NULL;
@ -2078,15 +2076,14 @@ array__array_reconstructor_impl(PyObject *module, PyTypeObject *arraytype,
Py_ssize_t i;
int le = (mformat_code == IEEE_754_DOUBLE_LE) ? 1 : 0;
Py_ssize_t itemcount = Py_SIZE(items) / 8;
const unsigned char *memstr =
(unsigned char *)PyBytes_AS_STRING(items);
const char *memstr = PyBytes_AS_STRING(items);
converted_items = PyList_New(itemcount);
if (converted_items == NULL)
return NULL;
for (i = 0; i < itemcount; i++) {
PyObject *pyfloat = PyFloat_FromDouble(
_PyFloat_Unpack8(&memstr[i * 8], le));
PyFloat_Unpack8(&memstr[i * 8], le));
if (pyfloat == NULL) {
Py_DECREF(converted_items);
return NULL;