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2902 lines (2560 loc) · 80.5 KB
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/* struct module -- pack values into and (out of) bytes objects */
/* New version supporting byte order, alignment and size options,
character strings, and unsigned numbers */
#ifndef Py_BUILD_CORE_BUILTIN
# define Py_BUILD_CORE_MODULE 1
#endif
#include "Python.h"
#include "pycore_bytesobject.h" // _PyBytesWriter
#include "pycore_lock.h" // _PyOnceFlag_CallOnce()
#include "pycore_long.h" // _PyLong_AsByteArray()
#include "pycore_moduleobject.h" // _PyModule_GetState()
#include "pycore_weakref.h" // FT_CLEAR_WEAKREFS()
#include <stddef.h> // offsetof()
/*[clinic input]
class Struct "PyStructObject *" "&PyStructType"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=9b032058a83ed7c3]*/
typedef struct {
PyObject *cache;
PyObject *PyStructType;
PyObject *unpackiter_type;
PyObject *StructError;
} _structmodulestate;
static inline _structmodulestate*
get_struct_state(PyObject *module)
{
void *state = _PyModule_GetState(module);
assert(state != NULL);
return (_structmodulestate *)state;
}
static struct PyModuleDef _structmodule;
#define get_struct_state_structinst(self) \
(get_struct_state(PyType_GetModuleByDef(Py_TYPE(self), &_structmodule)))
#define get_struct_state_iterinst(self) \
(get_struct_state(PyType_GetModule(Py_TYPE(self))))
/* The translation function for each format character is table driven */
typedef struct _formatdef {
char format;
Py_ssize_t size;
Py_ssize_t alignment;
PyObject* (*unpack)(_structmodulestate *, const char *,
const struct _formatdef *);
int (*pack)(_structmodulestate *, char *, PyObject *,
const struct _formatdef *);
} formatdef;
typedef struct _formatcode {
const struct _formatdef *fmtdef;
Py_ssize_t offset;
Py_ssize_t size;
Py_ssize_t repeat;
} formatcode;
/* Struct object interface */
typedef struct {
PyObject_HEAD
Py_ssize_t s_size;
Py_ssize_t s_len;
formatcode *s_codes;
PyObject *s_format;
PyObject *weakreflist; /* List of weak references */
bool init_called;
} PyStructObject;
#define PyStructObject_CAST(op) ((PyStructObject *)(op))
#define PyStruct_Check(op, state) PyObject_TypeCheck(op, (PyTypeObject *)(state)->PyStructType)
#ifdef __powerc
#pragma options align=reset
#endif
/*[python input]
class cache_struct_converter(CConverter):
type = 'PyStructObject *'
converter = 'cache_struct_converter'
c_default = "NULL"
broken_limited_capi = True
def parse_arg(self, argname, displayname, *, limited_capi):
assert not limited_capi
return self.format_code("""
if (!{converter}(module, {argname}, &{paramname})) {{{{
goto exit;
}}}}
""",
argname=argname,
converter=self.converter)
def cleanup(self):
return "Py_XDECREF(%s);\n" % self.name
[python start generated code]*/
/*[python end generated code: output=da39a3ee5e6b4b0d input=c33b27d6b06006c6]*/
static int cache_struct_converter(PyObject *, PyObject *, PyStructObject **);
#include "clinic/_struct.c.h"
/* Helper for integer format codes: converts an arbitrary Python object to a
PyLongObject if possible, otherwise fails. Caller should decref. */
static PyObject *
get_pylong(_structmodulestate *state, PyObject *v)
{
assert(v != NULL);
if (!PyLong_Check(v)) {
/* Not an integer; try to use __index__ to convert. */
if (PyIndex_Check(v)) {
v = _PyNumber_Index(v);
if (v == NULL)
return NULL;
}
else {
PyErr_SetString(state->StructError,
"required argument is not an integer");
return NULL;
}
}
else
Py_INCREF(v);
assert(PyLong_Check(v));
return v;
}
/* Helper routine to get a C long and raise the appropriate error if it isn't
one */
static int
get_long(_structmodulestate *state, PyObject *v, long *p)
{
long x;
v = get_pylong(state, v);
if (v == NULL)
return -1;
assert(PyLong_Check(v));
x = PyLong_AsLong(v);
Py_DECREF(v);
if (x == (long)-1 && PyErr_Occurred()) {
return -1;
}
*p = x;
return 0;
}
/* Same, but handling unsigned long */
static int
get_ulong(_structmodulestate *state, PyObject *v, unsigned long *p)
{
unsigned long x;
v = get_pylong(state, v);
if (v == NULL)
return -1;
assert(PyLong_Check(v));
x = PyLong_AsUnsignedLong(v);
Py_DECREF(v);
if (x == (unsigned long)-1 && PyErr_Occurred()) {
return -1;
}
*p = x;
return 0;
}
/* Same, but handling native long long. */
static int
get_longlong(_structmodulestate *state, PyObject *v, long long *p)
{
long long x;
v = get_pylong(state, v);
if (v == NULL)
return -1;
assert(PyLong_Check(v));
x = PyLong_AsLongLong(v);
Py_DECREF(v);
if (x == (long long)-1 && PyErr_Occurred()) {
return -1;
}
*p = x;
return 0;
}
/* Same, but handling native unsigned long long. */
static int
get_ulonglong(_structmodulestate *state, PyObject *v, unsigned long long *p)
{
unsigned long long x;
v = get_pylong(state, v);
if (v == NULL)
return -1;
assert(PyLong_Check(v));
x = PyLong_AsUnsignedLongLong(v);
Py_DECREF(v);
if (x == (unsigned long long)-1 && PyErr_Occurred()) {
return -1;
}
*p = x;
return 0;
}
/* Same, but handling Py_ssize_t */
static int
get_ssize_t(_structmodulestate *state, PyObject *v, Py_ssize_t *p)
{
Py_ssize_t x;
v = get_pylong(state, v);
if (v == NULL)
return -1;
assert(PyLong_Check(v));
x = PyLong_AsSsize_t(v);
Py_DECREF(v);
if (x == (Py_ssize_t)-1 && PyErr_Occurred()) {
return -1;
}
*p = x;
return 0;
}
/* Same, but handling size_t */
static int
get_size_t(_structmodulestate *state, PyObject *v, size_t *p)
{
size_t x;
v = get_pylong(state, v);
if (v == NULL)
return -1;
assert(PyLong_Check(v));
x = PyLong_AsSize_t(v);
Py_DECREF(v);
if (x == (size_t)-1 && PyErr_Occurred()) {
return -1;
}
*p = x;
return 0;
}
#define RANGE_ERROR(state, f, flag) return _range_error(state, f, flag)
/* Floating-point helpers */
static PyObject *
unpack_halffloat(const char *p, /* start of 2-byte string */
int le) /* true for little-endian, false for big-endian */
{
double x = PyFloat_Unpack2(p, le);
if (x == -1.0 && PyErr_Occurred()) {
return NULL;
}
return PyFloat_FromDouble(x);
}
static int
pack_halffloat(_structmodulestate *state,
char *p, /* start of 2-byte string */
PyObject *v, /* value to pack */
int le) /* true for little-endian, false for big-endian */
{
double x = PyFloat_AsDouble(v);
if (x == -1.0 && PyErr_Occurred()) {
PyErr_SetString(state->StructError,
"required argument is not a float");
return -1;
}
return PyFloat_Pack2(x, p, le);
}
static PyObject *
unpack_float(const char *p, /* start of 4-byte string */
int le) /* true for little-endian, false for big-endian */
{
double x;
x = PyFloat_Unpack4(p, le);
if (x == -1.0 && PyErr_Occurred())
return NULL;
return PyFloat_FromDouble(x);
}
static PyObject *
unpack_double(const char *p, /* start of 8-byte string */
int le) /* true for little-endian, false for big-endian */
{
double x;
x = PyFloat_Unpack8(p, le);
if (x == -1.0 && PyErr_Occurred())
return NULL;
return PyFloat_FromDouble(x);
}
/* Helper to format the range error exceptions */
static int
_range_error(_structmodulestate *state, const formatdef *f, int is_unsigned)
{
/* ulargest is the largest unsigned value with f->size bytes.
* Note that the simpler:
* ((size_t)1 << (f->size * 8)) - 1
* doesn't work when f->size == sizeof(size_t) because C doesn't
* define what happens when a left shift count is >= the number of
* bits in the integer being shifted; e.g., on some boxes it doesn't
* shift at all when they're equal.
*/
const size_t ulargest = (size_t)-1 >> ((SIZEOF_SIZE_T - f->size)*8);
assert(f->size >= 1 && f->size <= SIZEOF_SIZE_T);
if (is_unsigned)
PyErr_Format(state->StructError,
"'%c' format requires 0 <= number <= %zu",
f->format,
ulargest);
else {
const Py_ssize_t largest = (Py_ssize_t)(ulargest >> 1);
PyErr_Format(state->StructError,
"'%c' format requires %zd <= number <= %zd",
f->format,
~ largest,
largest);
}
return -1;
}
/* A large number of small routines follow, with names of the form
[bln][up]_TYPE
[bln] distinguishes among big-endian, little-endian and native.
[pu] distinguishes between pack (to struct) and unpack (from struct).
TYPE is one of char, byte, ubyte, etc.
*/
/* Native mode routines. ****************************************************/
/* NOTE:
In all n[up]_<type> routines handling types larger than 1 byte, there is
*no* guarantee that the p pointer is properly aligned for each type,
therefore memcpy is called. An intermediate variable is used to
compensate for big-endian architectures.
Normally both the intermediate variable and the memcpy call will be
skipped by C optimisation in little-endian architectures (gcc >= 2.91
does this). */
static PyObject *
nu_char(_structmodulestate *state, const char *p, const formatdef *f)
{
return PyBytes_FromStringAndSize(p, 1);
}
static PyObject *
nu_byte(_structmodulestate *state, const char *p, const formatdef *f)
{
return PyLong_FromLong((long) *(signed char *)p);
}
static PyObject *
nu_ubyte(_structmodulestate *state, const char *p, const formatdef *f)
{
return PyLong_FromLong((long) *(unsigned char *)p);
}
static PyObject *
nu_short(_structmodulestate *state, const char *p, const formatdef *f)
{
short x;
memcpy(&x, p, sizeof x);
return PyLong_FromLong((long)x);
}
static PyObject *
nu_ushort(_structmodulestate *state, const char *p, const formatdef *f)
{
unsigned short x;
memcpy(&x, p, sizeof x);
return PyLong_FromLong((long)x);
}
static PyObject *
nu_int(_structmodulestate *state, const char *p, const formatdef *f)
{
int x;
memcpy(&x, p, sizeof x);
return PyLong_FromLong((long)x);
}
static PyObject *
nu_uint(_structmodulestate *state, const char *p, const formatdef *f)
{
unsigned int x;
memcpy(&x, p, sizeof x);
return PyLong_FromUnsignedLong((unsigned long)x);
}
static PyObject *
nu_long(_structmodulestate *state, const char *p, const formatdef *f)
{
long x;
memcpy(&x, p, sizeof x);
return PyLong_FromLong(x);
}
static PyObject *
nu_ulong(_structmodulestate *state, const char *p, const formatdef *f)
{
unsigned long x;
memcpy(&x, p, sizeof x);
return PyLong_FromUnsignedLong(x);
}
static PyObject *
nu_ssize_t(_structmodulestate *state, const char *p, const formatdef *f)
{
Py_ssize_t x;
memcpy(&x, p, sizeof x);
return PyLong_FromSsize_t(x);
}
static PyObject *
nu_size_t(_structmodulestate *state, const char *p, const formatdef *f)
{
size_t x;
memcpy(&x, p, sizeof x);
return PyLong_FromSize_t(x);
}
static PyObject *
nu_longlong(_structmodulestate *state, const char *p, const formatdef *f)
{
long long x;
memcpy(&x, p, sizeof x);
return PyLong_FromLongLong(x);
}
static PyObject *
nu_ulonglong(_structmodulestate *state, const char *p, const formatdef *f)
{
unsigned long long x;
memcpy(&x, p, sizeof x);
return PyLong_FromUnsignedLongLong(x);
}
static PyObject *
nu_bool(_structmodulestate *state, const char *p, const formatdef *f)
{
const _Bool bool_false = 0;
return PyBool_FromLong(memcmp(p, &bool_false, sizeof(_Bool)));
}
static PyObject *
nu_halffloat(_structmodulestate *state, const char *p, const formatdef *f)
{
#if PY_LITTLE_ENDIAN
return unpack_halffloat(p, 1);
#else
return unpack_halffloat(p, 0);
#endif
}
static PyObject *
nu_float(_structmodulestate *state, const char *p, const formatdef *f)
{
float x;
memcpy(&x, p, sizeof x);
return PyFloat_FromDouble((double)x);
}
static PyObject *
nu_double(_structmodulestate *state, const char *p, const formatdef *f)
{
double x;
memcpy(&x, p, sizeof x);
return PyFloat_FromDouble(x);
}
static PyObject *
nu_float_complex(_structmodulestate *state, const char *p, const formatdef *f)
{
float x[2];
memcpy(&x, p, sizeof(x));
return PyComplex_FromDoubles(x[0], x[1]);
}
static PyObject *
nu_double_complex(_structmodulestate *state, const char *p, const formatdef *f)
{
double x[2];
memcpy(&x, p, sizeof(x));
return PyComplex_FromDoubles(x[0], x[1]);
}
static PyObject *
nu_void_p(_structmodulestate *state, const char *p, const formatdef *f)
{
void *x;
memcpy(&x, p, sizeof x);
return PyLong_FromVoidPtr(x);
}
static int
np_byte(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
{
long x;
if (get_long(state, v, &x) < 0) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
RANGE_ERROR(state, f, 0);
}
return -1;
}
if (x < -128 || x > 127) {
RANGE_ERROR(state, f, 0);
}
*p = (char)x;
return 0;
}
static int
np_ubyte(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
{
long x;
if (get_long(state, v, &x) < 0) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
RANGE_ERROR(state, f, 1);
}
return -1;
}
if (x < 0 || x > 255) {
RANGE_ERROR(state, f, 1);
}
*(unsigned char *)p = (unsigned char)x;
return 0;
}
static int
np_char(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
{
if (!PyBytes_Check(v) || PyBytes_Size(v) != 1) {
PyErr_SetString(state->StructError,
"char format requires a bytes object of length 1");
return -1;
}
*p = *PyBytes_AS_STRING(v);
return 0;
}
static int
np_short(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
{
long x;
short y;
if (get_long(state, v, &x) < 0) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
RANGE_ERROR(state, f, 0);
}
return -1;
}
if (x < SHRT_MIN || x > SHRT_MAX) {
RANGE_ERROR(state, f, 0);
}
y = (short)x;
memcpy(p, &y, sizeof y);
return 0;
}
static int
np_ushort(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
{
long x;
unsigned short y;
if (get_long(state, v, &x) < 0) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
RANGE_ERROR(state, f, 1);
}
return -1;
}
if (x < 0 || x > USHRT_MAX) {
RANGE_ERROR(state, f, 1);
}
y = (unsigned short)x;
memcpy(p, &y, sizeof y);
return 0;
}
static int
np_int(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
{
long x;
int y;
if (get_long(state, v, &x) < 0) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
RANGE_ERROR(state, f, 0);
}
return -1;
}
#if (SIZEOF_LONG > SIZEOF_INT)
if ((x < ((long)INT_MIN)) || (x > ((long)INT_MAX)))
RANGE_ERROR(state, f, 0);
#endif
y = (int)x;
memcpy(p, &y, sizeof y);
return 0;
}
static int
np_uint(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
{
unsigned long x;
unsigned int y;
if (get_ulong(state, v, &x) < 0) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
RANGE_ERROR(state, f, 1);
}
return -1;
}
y = (unsigned int)x;
#if (SIZEOF_LONG > SIZEOF_INT)
if (x > ((unsigned long)UINT_MAX))
RANGE_ERROR(state, f, 1);
#endif
memcpy(p, &y, sizeof y);
return 0;
}
static int
np_long(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
{
long x;
if (get_long(state, v, &x) < 0) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
RANGE_ERROR(state, f, 0);
}
return -1;
}
memcpy(p, &x, sizeof x);
return 0;
}
static int
np_ulong(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
{
unsigned long x;
if (get_ulong(state, v, &x) < 0) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
RANGE_ERROR(state, f, 1);
}
return -1;
}
memcpy(p, &x, sizeof x);
return 0;
}
static int
np_ssize_t(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
{
Py_ssize_t x;
if (get_ssize_t(state, v, &x) < 0) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
RANGE_ERROR(state, f, 0);
}
return -1;
}
memcpy(p, &x, sizeof x);
return 0;
}
static int
np_size_t(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
{
size_t x;
if (get_size_t(state, v, &x) < 0) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
RANGE_ERROR(state, f, 1);
}
return -1;
}
memcpy(p, &x, sizeof x);
return 0;
}
static int
np_longlong(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
{
long long x;
if (get_longlong(state, v, &x) < 0) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
PyErr_Format(state->StructError,
"'%c' format requires %lld <= number <= %lld",
f->format,
LLONG_MIN,
LLONG_MAX);
}
return -1;
}
memcpy(p, &x, sizeof x);
return 0;
}
static int
np_ulonglong(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
{
unsigned long long x;
if (get_ulonglong(state, v, &x) < 0) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
PyErr_Format(state->StructError,
"'%c' format requires 0 <= number <= %llu",
f->format,
ULLONG_MAX);
}
return -1;
}
memcpy(p, &x, sizeof x);
return 0;
}
static int
np_bool(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
{
int y;
_Bool x;
y = PyObject_IsTrue(v);
if (y < 0)
return -1;
x = y;
memcpy(p, &x, sizeof x);
return 0;
}
static int
np_halffloat(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
{
#if PY_LITTLE_ENDIAN
return pack_halffloat(state, p, v, 1);
#else
return pack_halffloat(state, p, v, 0);
#endif
}
static int
np_float(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
{
double x = PyFloat_AsDouble(v);
if (x == -1 && PyErr_Occurred()) {
PyErr_SetString(state->StructError,
"required argument is not a float");
return -1;
}
return PyFloat_Pack4(x, p, PY_LITTLE_ENDIAN);
}
static int
np_double(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
{
double x = PyFloat_AsDouble(v);
if (x == -1 && PyErr_Occurred()) {
PyErr_SetString(state->StructError,
"required argument is not a float");
return -1;
}
memcpy(p, &x, sizeof(double));
return 0;
}
static int
np_float_complex(_structmodulestate *state, char *p, PyObject *v,
const formatdef *f)
{
Py_complex c = PyComplex_AsCComplex(v);
float x[2] = {(float)c.real, (float)c.imag};
if (c.real == -1 && PyErr_Occurred()) {
PyErr_SetString(state->StructError,
"required argument is not a complex");
return -1;
}
memcpy(p, &x, sizeof(x));
return 0;
}
static int
np_double_complex(_structmodulestate *state, char *p, PyObject *v,
const formatdef *f)
{
Py_complex c = PyComplex_AsCComplex(v);
double x[2] = {c.real, c.imag};
if (c.real == -1 && PyErr_Occurred()) {
PyErr_SetString(state->StructError,
"required argument is not a complex");
return -1;
}
memcpy(p, &x, sizeof(x));
return 0;
}
static int
np_void_p(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
{
void *x;
v = get_pylong(state, v);
if (v == NULL)
return -1;
assert(PyLong_Check(v));
x = PyLong_AsVoidPtr(v);
Py_DECREF(v);
if (x == NULL && PyErr_Occurred())
return -1;
memcpy(p, &x, sizeof x);
return 0;
}
static const formatdef native_table[] = {
{'x', sizeof(char), 0, NULL},
{'b', sizeof(char), 0, nu_byte, np_byte},
{'B', sizeof(char), 0, nu_ubyte, np_ubyte},
{'c', sizeof(char), 0, nu_char, np_char},
{'s', sizeof(char), 0, NULL},
{'p', sizeof(char), 0, NULL},
{'h', sizeof(short), _Alignof(short), nu_short, np_short},
{'H', sizeof(short), _Alignof(short), nu_ushort, np_ushort},
{'i', sizeof(int), _Alignof(int), nu_int, np_int},
{'I', sizeof(int), _Alignof(int), nu_uint, np_uint},
{'l', sizeof(long), _Alignof(long), nu_long, np_long},
{'L', sizeof(long), _Alignof(long), nu_ulong, np_ulong},
{'n', sizeof(size_t), _Alignof(size_t), nu_ssize_t, np_ssize_t},
{'N', sizeof(size_t), _Alignof(size_t), nu_size_t, np_size_t},
{'q', sizeof(long long), _Alignof(long long), nu_longlong, np_longlong},
{'Q', sizeof(long long), _Alignof(long long), nu_ulonglong,np_ulonglong},
{'?', sizeof(_Bool), _Alignof(_Bool), nu_bool, np_bool},
{'e', sizeof(short), _Alignof(short), nu_halffloat, np_halffloat},
{'f', sizeof(float), _Alignof(float), nu_float, np_float},
{'d', sizeof(double), _Alignof(double), nu_double, np_double},
{'F', 2*sizeof(float), _Alignof(float), nu_float_complex, np_float_complex},
{'D', 2*sizeof(double), _Alignof(double), nu_double_complex, np_double_complex},
{'P', sizeof(void *), _Alignof(void *), nu_void_p, np_void_p},
{0}
};
/* Big-endian routines. *****************************************************/
static PyObject *
bu_short(_structmodulestate *state, const char *p, const formatdef *f)
{
unsigned long x = 0;
/* This function is only ever used in the case f->size == 2. */
assert(f->size == 2);
Py_ssize_t i = 2;
const unsigned char *bytes = (const unsigned char *)p;
do {
x = (x<<8) | *bytes++;
} while (--i > 0);
/* Extend sign, avoiding implementation-defined or undefined behaviour. */
x = (x ^ 0x8000U) - 0x8000U;
return PyLong_FromLong(x & 0x8000U ? -1 - (long)(~x) : (long)x);
}
static PyObject *
bu_int(_structmodulestate *state, const char *p, const formatdef *f)
{
unsigned long x = 0;
/* This function is only ever used in the case f->size == 4. */
assert(f->size == 4);
Py_ssize_t i = 4;
const unsigned char *bytes = (const unsigned char *)p;
do {
x = (x<<8) | *bytes++;
} while (--i > 0);
/* Extend sign, avoiding implementation-defined or undefined behaviour. */
x = (x ^ 0x80000000U) - 0x80000000U;
return PyLong_FromLong(x & 0x80000000U ? -1 - (long)(~x) : (long)x);
}
static PyObject *
bu_uint(_structmodulestate *state, const char *p, const formatdef *f)
{
unsigned long x = 0;
Py_ssize_t i = f->size;
const unsigned char *bytes = (const unsigned char *)p;
do {
x = (x<<8) | *bytes++;
} while (--i > 0);
return PyLong_FromUnsignedLong(x);
}
static PyObject *
bu_longlong(_structmodulestate *state, const char *p, const formatdef *f)
{
unsigned long long x = 0;
/* This function is only ever used in the case f->size == 8. */
assert(f->size == 8);
Py_ssize_t i = 8;
const unsigned char *bytes = (const unsigned char *)p;
do {
x = (x<<8) | *bytes++;
} while (--i > 0);
/* Extend sign, avoiding implementation-defined or undefined behaviour. */
x = (x ^ 0x8000000000000000U) - 0x8000000000000000U;
return PyLong_FromLongLong(
x & 0x8000000000000000U ? -1 - (long long)(~x) : (long long)x);
}
static PyObject *
bu_ulonglong(_structmodulestate *state, const char *p, const formatdef *f)
{
unsigned long long x = 0;
Py_ssize_t i = f->size;
const unsigned char *bytes = (const unsigned char *)p;
do {
x = (x<<8) | *bytes++;
} while (--i > 0);
return PyLong_FromUnsignedLongLong(x);
}
static PyObject *
bu_halffloat(_structmodulestate *state, const char *p, const formatdef *f)
{
return unpack_halffloat(p, 0);
}
static PyObject *
bu_float(_structmodulestate *state, const char *p, const formatdef *f)
{
return unpack_float(p, 0);
}
static PyObject *
bu_double(_structmodulestate *state, const char *p, const formatdef *f)
{
return unpack_double(p, 0);
}
static PyObject *
bu_float_complex(_structmodulestate *state, const char *p, const formatdef *f)
{
double x = PyFloat_Unpack4(p, 0);
if (x == -1.0 && PyErr_Occurred()) {
return NULL;
}
double y = PyFloat_Unpack4(p + 4, 0);
if (y == -1.0 && PyErr_Occurred()) {
return NULL;
}
return PyComplex_FromDoubles(x, y);
}
static PyObject *
bu_double_complex(_structmodulestate *state, const char *p, const formatdef *f)
{
double x, y;
x = PyFloat_Unpack8(p, 0);
if (x == -1.0 && PyErr_Occurred()) {
return NULL;
}
y = PyFloat_Unpack8(p + 8, 0);
if (y == -1.0 && PyErr_Occurred()) {
return NULL;
}
return PyComplex_FromDoubles(x, y);
}
static PyObject *
bu_bool(_structmodulestate *state, const char *p, const formatdef *f)
{
return PyBool_FromLong(*p != 0);
}
static int
bp_int(_structmodulestate *state, char *p, PyObject *v, const formatdef *f)
{
long x;
Py_ssize_t i;