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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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19
Modules/_struct.c
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@ -10,7 +10,6 @@
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#include "pycore_floatobject.h" // _PyFloat_Unpack2()
#include "pycore_moduleobject.h" // _PyModule_GetState()
#include "structmember.h" // PyMemberDef
#include <ctype.h>
@ -303,9 +302,7 @@ static PyObject *
unpack_halffloat(const char *p, /* start of 2-byte string */
int le) /* true for little-endian, false for big-endian */
{
double x;
x = _PyFloat_Unpack2((unsigned char *)p, le);
double x = PyFloat_Unpack2(p, le);
if (x == -1.0 && PyErr_Occurred()) {
return NULL;
}
@ -324,7 +321,7 @@ pack_halffloat(_structmodulestate *state,
"required argument is not a float");
return -1;
}
return _PyFloat_Pack2(x, (unsigned char *)p, le);
return PyFloat_Pack2(x, p, le);
}
static PyObject *
@ -333,7 +330,7 @@ unpack_float(const char *p, /* start of 4-byte string */
{
double x;
x = _PyFloat_Unpack4((unsigned char *)p, le);
x = PyFloat_Unpack4(p, le);
if (x == -1.0 && PyErr_Occurred())
return NULL;
return PyFloat_FromDouble(x);
@ -345,7 +342,7 @@ unpack_double(const char *p, /* start of 8-byte string */
{
double x;
x = _PyFloat_Unpack8((unsigned char *)p, le);
x = PyFloat_Unpack8(p, le);
if (x == -1.0 && PyErr_Occurred())
return NULL;
return PyFloat_FromDouble(x);
@ -979,7 +976,7 @@ bp_float(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
"required argument is not a float");
return -1;
}
return _PyFloat_Pack4(x, (unsigned char *)p, 0);
return PyFloat_Pack4(x, p, 0);
}
static int
@ -991,7 +988,7 @@ bp_double(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
"required argument is not a float");
return -1;
}
return _PyFloat_Pack8(x, (unsigned char *)p, 0);
return PyFloat_Pack8(x, p, 0);
}
static int
@ -1194,7 +1191,7 @@ lp_float(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
"required argument is not a float");
return -1;
}
return _PyFloat_Pack4(x, (unsigned char *)p, 1);
return PyFloat_Pack4(x, p, 1);
}
static int
@ -1206,7 +1203,7 @@ lp_double(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
"required argument is not a float");
return -1;
}
return _PyFloat_Pack8(x, (unsigned char *)p, 1);
return PyFloat_Pack8(x, p, 1);
}
static formatdef lilendian_table[] = {