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2152 lines (1895 loc) · 58 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 */
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#include "structmember.h"
#include <ctype.h>
static PyTypeObject PyStructType;
/* 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)(const char *,
const struct _formatdef *);
int (*pack)(char *, PyObject *,
const struct _formatdef *);
} formatdef;
typedef struct _formatcode {
const struct _formatdef *fmtdef;
Py_ssize_t offset;
Py_ssize_t size;
} 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 */
} PyStructObject;
#define PyStruct_Check(op) PyObject_TypeCheck(op, &PyStructType)
#define PyStruct_CheckExact(op) (Py_TYPE(op) == &PyStructType)
/* Exception */
static PyObject *StructError;
/* Define various structs to figure out the alignments of types */
typedef struct { char c; short x; } st_short;
typedef struct { char c; int x; } st_int;
typedef struct { char c; long x; } st_long;
typedef struct { char c; float x; } st_float;
typedef struct { char c; double x; } st_double;
typedef struct { char c; void *x; } st_void_p;
typedef struct { char c; size_t x; } st_size_t;
#define SHORT_ALIGN (sizeof(st_short) - sizeof(short))
#define INT_ALIGN (sizeof(st_int) - sizeof(int))
#define LONG_ALIGN (sizeof(st_long) - sizeof(long))
#define FLOAT_ALIGN (sizeof(st_float) - sizeof(float))
#define DOUBLE_ALIGN (sizeof(st_double) - sizeof(double))
#define VOID_P_ALIGN (sizeof(st_void_p) - sizeof(void *))
#define SIZE_T_ALIGN (sizeof(st_size_t) - sizeof(size_t))
/* We can't support q and Q in native mode unless the compiler does;
in std mode, they're 8 bytes on all platforms. */
#ifdef HAVE_LONG_LONG
typedef struct { char c; PY_LONG_LONG x; } s_long_long;
#define LONG_LONG_ALIGN (sizeof(s_long_long) - sizeof(PY_LONG_LONG))
#endif
#ifdef HAVE_C99_BOOL
#define BOOL_TYPE _Bool
typedef struct { char c; _Bool x; } s_bool;
#define BOOL_ALIGN (sizeof(s_bool) - sizeof(BOOL_TYPE))
#else
#define BOOL_TYPE char
#define BOOL_ALIGN 0
#endif
#define STRINGIFY(x) #x
#ifdef __powerc
#pragma options align=reset
#endif
/* Helper for integer format codes: converts an arbitrary Python object to a
PyLongObject if possible, otherwise fails. Caller should decref. */
static PyObject *
get_pylong(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(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(PyObject *v, long *p)
{
long x;
v = get_pylong(v);
if (v == NULL)
return -1;
assert(PyLong_Check(v));
x = PyLong_AsLong(v);
Py_DECREF(v);
if (x == (long)-1 && PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError))
PyErr_SetString(StructError,
"argument out of range");
return -1;
}
*p = x;
return 0;
}
/* Same, but handling unsigned long */
static int
get_ulong(PyObject *v, unsigned long *p)
{
unsigned long x;
v = get_pylong(v);
if (v == NULL)
return -1;
assert(PyLong_Check(v));
x = PyLong_AsUnsignedLong(v);
Py_DECREF(v);
if (x == (unsigned long)-1 && PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError))
PyErr_SetString(StructError,
"argument out of range");
return -1;
}
*p = x;
return 0;
}
#ifdef HAVE_LONG_LONG
/* Same, but handling native long long. */
static int
get_longlong(PyObject *v, PY_LONG_LONG *p)
{
PY_LONG_LONG x;
v = get_pylong(v);
if (v == NULL)
return -1;
assert(PyLong_Check(v));
x = PyLong_AsLongLong(v);
Py_DECREF(v);
if (x == (PY_LONG_LONG)-1 && PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError))
PyErr_SetString(StructError,
"argument out of range");
return -1;
}
*p = x;
return 0;
}
/* Same, but handling native unsigned long long. */
static int
get_ulonglong(PyObject *v, unsigned PY_LONG_LONG *p)
{
unsigned PY_LONG_LONG x;
v = get_pylong(v);
if (v == NULL)
return -1;
assert(PyLong_Check(v));
x = PyLong_AsUnsignedLongLong(v);
Py_DECREF(v);
if (x == (unsigned PY_LONG_LONG)-1 && PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError))
PyErr_SetString(StructError,
"argument out of range");
return -1;
}
*p = x;
return 0;
}
#endif
/* Same, but handling Py_ssize_t */
static int
get_ssize_t(PyObject *v, Py_ssize_t *p)
{
Py_ssize_t x;
v = get_pylong(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()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError))
PyErr_SetString(StructError,
"argument out of range");
return -1;
}
*p = x;
return 0;
}
/* Same, but handling size_t */
static int
get_size_t(PyObject *v, size_t *p)
{
size_t x;
v = get_pylong(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()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError))
PyErr_SetString(StructError,
"argument out of range");
return -1;
}
*p = x;
return 0;
}
#define RANGE_ERROR(x, f, flag, mask) return _range_error(f, flag)
/* Floating point helpers */
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((unsigned char *)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((unsigned char *)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(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(StructError,
"'%c' format requires 0 <= number <= %zu",
f->format,
ulargest);
else {
const Py_ssize_t largest = (Py_ssize_t)(ulargest >> 1);
PyErr_Format(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] distiguishes among big-endian, little-endian and native.
[pu] distiguishes 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(const char *p, const formatdef *f)
{
return PyBytes_FromStringAndSize(p, 1);
}
static PyObject *
nu_byte(const char *p, const formatdef *f)
{
return PyLong_FromLong((long) *(signed char *)p);
}
static PyObject *
nu_ubyte(const char *p, const formatdef *f)
{
return PyLong_FromLong((long) *(unsigned char *)p);
}
static PyObject *
nu_short(const char *p, const formatdef *f)
{
short x;
memcpy((char *)&x, p, sizeof x);
return PyLong_FromLong((long)x);
}
static PyObject *
nu_ushort(const char *p, const formatdef *f)
{
unsigned short x;
memcpy((char *)&x, p, sizeof x);
return PyLong_FromLong((long)x);
}
static PyObject *
nu_int(const char *p, const formatdef *f)
{
int x;
memcpy((char *)&x, p, sizeof x);
return PyLong_FromLong((long)x);
}
static PyObject *
nu_uint(const char *p, const formatdef *f)
{
unsigned int x;
memcpy((char *)&x, p, sizeof x);
#if (SIZEOF_LONG > SIZEOF_INT)
return PyLong_FromLong((long)x);
#else
if (x <= ((unsigned int)LONG_MAX))
return PyLong_FromLong((long)x);
return PyLong_FromUnsignedLong((unsigned long)x);
#endif
}
static PyObject *
nu_long(const char *p, const formatdef *f)
{
long x;
memcpy((char *)&x, p, sizeof x);
return PyLong_FromLong(x);
}
static PyObject *
nu_ulong(const char *p, const formatdef *f)
{
unsigned long x;
memcpy((char *)&x, p, sizeof x);
if (x <= LONG_MAX)
return PyLong_FromLong((long)x);
return PyLong_FromUnsignedLong(x);
}
static PyObject *
nu_ssize_t(const char *p, const formatdef *f)
{
Py_ssize_t x;
memcpy((char *)&x, p, sizeof x);
return PyLong_FromSsize_t(x);
}
static PyObject *
nu_size_t(const char *p, const formatdef *f)
{
size_t x;
memcpy((char *)&x, p, sizeof x);
return PyLong_FromSize_t(x);
}
/* Native mode doesn't support q or Q unless the platform C supports
long long (or, on Windows, __int64). */
#ifdef HAVE_LONG_LONG
static PyObject *
nu_longlong(const char *p, const formatdef *f)
{
PY_LONG_LONG x;
memcpy((char *)&x, p, sizeof x);
if (x >= LONG_MIN && x <= LONG_MAX)
return PyLong_FromLong(Py_SAFE_DOWNCAST(x, PY_LONG_LONG, long));
return PyLong_FromLongLong(x);
}
static PyObject *
nu_ulonglong(const char *p, const formatdef *f)
{
unsigned PY_LONG_LONG x;
memcpy((char *)&x, p, sizeof x);
if (x <= LONG_MAX)
return PyLong_FromLong(Py_SAFE_DOWNCAST(x, unsigned PY_LONG_LONG, long));
return PyLong_FromUnsignedLongLong(x);
}
#endif
static PyObject *
nu_bool(const char *p, const formatdef *f)
{
BOOL_TYPE x;
memcpy((char *)&x, p, sizeof x);
return PyBool_FromLong(x != 0);
}
static PyObject *
nu_float(const char *p, const formatdef *f)
{
float x;
memcpy((char *)&x, p, sizeof x);
return PyFloat_FromDouble((double)x);
}
static PyObject *
nu_double(const char *p, const formatdef *f)
{
double x;
memcpy((char *)&x, p, sizeof x);
return PyFloat_FromDouble(x);
}
static PyObject *
nu_void_p(const char *p, const formatdef *f)
{
void *x;
memcpy((char *)&x, p, sizeof x);
return PyLong_FromVoidPtr(x);
}
static int
np_byte(char *p, PyObject *v, const formatdef *f)
{
long x;
if (get_long(v, &x) < 0)
return -1;
if (x < -128 || x > 127){
PyErr_SetString(StructError,
"byte format requires -128 <= number <= 127");
return -1;
}
*p = (char)x;
return 0;
}
static int
np_ubyte(char *p, PyObject *v, const formatdef *f)
{
long x;
if (get_long(v, &x) < 0)
return -1;
if (x < 0 || x > 255){
PyErr_SetString(StructError,
"ubyte format requires 0 <= number <= 255");
return -1;
}
*p = (char)x;
return 0;
}
static int
np_char(char *p, PyObject *v, const formatdef *f)
{
if (!PyBytes_Check(v) || PyBytes_Size(v) != 1) {
PyErr_SetString(StructError,
"char format requires a bytes object of length 1");
return -1;
}
*p = *PyBytes_AsString(v);
return 0;
}
static int
np_short(char *p, PyObject *v, const formatdef *f)
{
long x;
short y;
if (get_long(v, &x) < 0)
return -1;
if (x < SHRT_MIN || x > SHRT_MAX){
PyErr_SetString(StructError,
"short format requires " STRINGIFY(SHRT_MIN)
" <= number <= " STRINGIFY(SHRT_MAX));
return -1;
}
y = (short)x;
memcpy(p, (char *)&y, sizeof y);
return 0;
}
static int
np_ushort(char *p, PyObject *v, const formatdef *f)
{
long x;
unsigned short y;
if (get_long(v, &x) < 0)
return -1;
if (x < 0 || x > USHRT_MAX){
PyErr_SetString(StructError,
"ushort format requires 0 <= number <= " STRINGIFY(USHRT_MAX));
return -1;
}
y = (unsigned short)x;
memcpy(p, (char *)&y, sizeof y);
return 0;
}
static int
np_int(char *p, PyObject *v, const formatdef *f)
{
long x;
int y;
if (get_long(v, &x) < 0)
return -1;
#if (SIZEOF_LONG > SIZEOF_INT)
if ((x < ((long)INT_MIN)) || (x > ((long)INT_MAX)))
RANGE_ERROR(x, f, 0, -1);
#endif
y = (int)x;
memcpy(p, (char *)&y, sizeof y);
return 0;
}
static int
np_uint(char *p, PyObject *v, const formatdef *f)
{
unsigned long x;
unsigned int y;
if (get_ulong(v, &x) < 0)
return -1;
y = (unsigned int)x;
#if (SIZEOF_LONG > SIZEOF_INT)
if (x > ((unsigned long)UINT_MAX))
RANGE_ERROR(y, f, 1, -1);
#endif
memcpy(p, (char *)&y, sizeof y);
return 0;
}
static int
np_long(char *p, PyObject *v, const formatdef *f)
{
long x;
if (get_long(v, &x) < 0)
return -1;
memcpy(p, (char *)&x, sizeof x);
return 0;
}
static int
np_ulong(char *p, PyObject *v, const formatdef *f)
{
unsigned long x;
if (get_ulong(v, &x) < 0)
return -1;
memcpy(p, (char *)&x, sizeof x);
return 0;
}
static int
np_ssize_t(char *p, PyObject *v, const formatdef *f)
{
Py_ssize_t x;
if (get_ssize_t(v, &x) < 0)
return -1;
memcpy(p, (char *)&x, sizeof x);
return 0;
}
static int
np_size_t(char *p, PyObject *v, const formatdef *f)
{
size_t x;
if (get_size_t(v, &x) < 0)
return -1;
memcpy(p, (char *)&x, sizeof x);
return 0;
}
#ifdef HAVE_LONG_LONG
static int
np_longlong(char *p, PyObject *v, const formatdef *f)
{
PY_LONG_LONG x;
if (get_longlong(v, &x) < 0)
return -1;
memcpy(p, (char *)&x, sizeof x);
return 0;
}
static int
np_ulonglong(char *p, PyObject *v, const formatdef *f)
{
unsigned PY_LONG_LONG x;
if (get_ulonglong(v, &x) < 0)
return -1;
memcpy(p, (char *)&x, sizeof x);
return 0;
}
#endif
static int
np_bool(char *p, PyObject *v, const formatdef *f)
{
int y;
BOOL_TYPE x;
y = PyObject_IsTrue(v);
if (y < 0)
return -1;
x = y;
memcpy(p, (char *)&x, sizeof x);
return 0;
}
static int
np_float(char *p, PyObject *v, const formatdef *f)
{
float x = (float)PyFloat_AsDouble(v);
if (x == -1 && PyErr_Occurred()) {
PyErr_SetString(StructError,
"required argument is not a float");
return -1;
}
memcpy(p, (char *)&x, sizeof x);
return 0;
}
static int
np_double(char *p, PyObject *v, const formatdef *f)
{
double x = PyFloat_AsDouble(v);
if (x == -1 && PyErr_Occurred()) {
PyErr_SetString(StructError,
"required argument is not a float");
return -1;
}
memcpy(p, (char *)&x, sizeof(double));
return 0;
}
static int
np_void_p(char *p, PyObject *v, const formatdef *f)
{
void *x;
v = get_pylong(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, (char *)&x, sizeof x);
return 0;
}
static 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), SHORT_ALIGN, nu_short, np_short},
{'H', sizeof(short), SHORT_ALIGN, nu_ushort, np_ushort},
{'i', sizeof(int), INT_ALIGN, nu_int, np_int},
{'I', sizeof(int), INT_ALIGN, nu_uint, np_uint},
{'l', sizeof(long), LONG_ALIGN, nu_long, np_long},
{'L', sizeof(long), LONG_ALIGN, nu_ulong, np_ulong},
{'n', sizeof(size_t), SIZE_T_ALIGN, nu_ssize_t, np_ssize_t},
{'N', sizeof(size_t), SIZE_T_ALIGN, nu_size_t, np_size_t},
#ifdef HAVE_LONG_LONG
{'q', sizeof(PY_LONG_LONG), LONG_LONG_ALIGN, nu_longlong, np_longlong},
{'Q', sizeof(PY_LONG_LONG), LONG_LONG_ALIGN, nu_ulonglong,np_ulonglong},
#endif
{'?', sizeof(BOOL_TYPE), BOOL_ALIGN, nu_bool, np_bool},
{'f', sizeof(float), FLOAT_ALIGN, nu_float, np_float},
{'d', sizeof(double), DOUBLE_ALIGN, nu_double, np_double},
{'P', sizeof(void *), VOID_P_ALIGN, nu_void_p, np_void_p},
{0}
};
/* Big-endian routines. *****************************************************/
static PyObject *
bu_int(const char *p, const formatdef *f)
{
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);
/* Extend the sign bit. */
if (SIZEOF_LONG > f->size)
x |= -(x & (1L << ((8 * f->size) - 1)));
return PyLong_FromLong(x);
}
static PyObject *
bu_uint(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);
if (x <= LONG_MAX)
return PyLong_FromLong((long)x);
return PyLong_FromUnsignedLong(x);
}
static PyObject *
bu_longlong(const char *p, const formatdef *f)
{
#ifdef HAVE_LONG_LONG
PY_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);
/* Extend the sign bit. */
if (SIZEOF_LONG_LONG > f->size)
x |= -(x & ((PY_LONG_LONG)1 << ((8 * f->size) - 1)));
if (x >= LONG_MIN && x <= LONG_MAX)
return PyLong_FromLong(Py_SAFE_DOWNCAST(x, PY_LONG_LONG, long));
return PyLong_FromLongLong(x);
#else
return _PyLong_FromByteArray((const unsigned char *)p,
8,
0, /* little-endian */
1 /* signed */);
#endif
}
static PyObject *
bu_ulonglong(const char *p, const formatdef *f)
{
#ifdef HAVE_LONG_LONG
unsigned PY_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);
if (x <= LONG_MAX)
return PyLong_FromLong(Py_SAFE_DOWNCAST(x, unsigned PY_LONG_LONG, long));
return PyLong_FromUnsignedLongLong(x);
#else
return _PyLong_FromByteArray((const unsigned char *)p,
8,
0, /* little-endian */
0 /* signed */);
#endif
}
static PyObject *
bu_float(const char *p, const formatdef *f)
{
return unpack_float(p, 0);
}
static PyObject *
bu_double(const char *p, const formatdef *f)
{
return unpack_double(p, 0);
}
static PyObject *
bu_bool(const char *p, const formatdef *f)
{
char x;
memcpy((char *)&x, p, sizeof x);
return PyBool_FromLong(x != 0);
}
static int
bp_int(char *p, PyObject *v, const formatdef *f)
{
long x;
Py_ssize_t i;
if (get_long(v, &x) < 0)
return -1;
i = f->size;
if (i != SIZEOF_LONG) {
if ((i == 2) && (x < -32768 || x > 32767))
RANGE_ERROR(x, f, 0, 0xffffL);
#if (SIZEOF_LONG != 4)
else if ((i == 4) && (x < -2147483648L || x > 2147483647L))
RANGE_ERROR(x, f, 0, 0xffffffffL);
#endif
}
do {
p[--i] = (char)x;
x >>= 8;
} while (i > 0);
return 0;
}
static int
bp_uint(char *p, PyObject *v, const formatdef *f)
{
unsigned long x;
Py_ssize_t i;
if (get_ulong(v, &x) < 0)
return -1;
i = f->size;
if (i != SIZEOF_LONG) {
unsigned long maxint = 1;
maxint <<= (unsigned long)(i * 8);
if (x >= maxint)
RANGE_ERROR(x, f, 1, maxint - 1);
}
do {
p[--i] = (char)x;
x >>= 8;
} while (i > 0);
return 0;
}
static int
bp_longlong(char *p, PyObject *v, const formatdef *f)
{
int res;
v = get_pylong(v);
if (v == NULL)
return -1;
res = _PyLong_AsByteArray((PyLongObject *)v,
(unsigned char *)p,
8,
0, /* little_endian */
1 /* signed */);
Py_DECREF(v);
return res;
}
static int
bp_ulonglong(char *p, PyObject *v, const formatdef *f)
{
int res;
v = get_pylong(v);
if (v == NULL)
return -1;
res = _PyLong_AsByteArray((PyLongObject *)v,
(unsigned char *)p,
8,
0, /* little_endian */
0 /* signed */);
Py_DECREF(v);
return res;
}
static int
bp_float(char *p, PyObject *v, const formatdef *f)
{
double x = PyFloat_AsDouble(v);
if (x == -1 && PyErr_Occurred()) {
PyErr_SetString(StructError,
"required argument is not a float");
return -1;
}
return _PyFloat_Pack4(x, (unsigned char *)p, 0);
}
static int
bp_double(char *p, PyObject *v, const formatdef *f)
{
double x = PyFloat_AsDouble(v);
if (x == -1 && PyErr_Occurred()) {
PyErr_SetString(StructError,
"required argument is not a float");
return -1;
}
return _PyFloat_Pack8(x, (unsigned char *)p, 0);
}
static int
bp_bool(char *p, PyObject *v, const formatdef *f)
{
int y;
y = PyObject_IsTrue(v);
if (y < 0)
return -1;
*p = (char)y;
return 0;
}
static formatdef bigendian_table[] = {
{'x', 1, 0, NULL},
{'b', 1, 0, nu_byte, np_byte},
{'B', 1, 0, nu_ubyte, np_ubyte},
{'c', 1, 0, nu_char, np_char},
{'s', 1, 0, NULL},
{'p', 1, 0, NULL},
{'h', 2, 0, bu_int, bp_int},
{'H', 2, 0, bu_uint, bp_uint},
{'i', 4, 0, bu_int, bp_int},
{'I', 4, 0, bu_uint, bp_uint},
{'l', 4, 0, bu_int, bp_int},
{'L', 4, 0, bu_uint, bp_uint},
{'q', 8, 0, bu_longlong, bp_longlong},
{'Q', 8, 0, bu_ulonglong, bp_ulonglong},
{'?', 1, 0, bu_bool, bp_bool},
{'f', 4, 0, bu_float, bp_float},
{'d', 8, 0, bu_double, bp_double},
{0}
};
/* Little-endian routines. *****************************************************/
static PyObject *
lu_int(const char *p, const formatdef *f)
{
long x = 0;
Py_ssize_t i = f->size;
const unsigned char *bytes = (const unsigned char *)p;
do {
x = (x<<8) | bytes[--i];
} while (i > 0);
/* Extend the sign bit. */
if (SIZEOF_LONG > f->size)
x |= -(x & (1L << ((8 * f->size) - 1)));
return PyLong_FromLong(x);
}
static PyObject *
lu_uint(const char *p, const formatdef *f)
{
unsigned long x = 0;