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bpo-38076: Make struct module PEP-384 compatible (#15805) 

* PEP-384 _struct

* More PEP-384 fixes for _struct

Summary: Add a couple of more fixes for `_struct` that were previously missed such as removing `tp_*` accessors and using `PyBytesWriter` instead of calling `PyBytes_FromStringAndSize` with `NULL`. Also added a test to confirm that `iter_unpack` type is still uninstantiable.

* 📜🤖 Added by blurb_it.
This commit is contained in:
Dino Viehland 2019-09-10 11:18:37 +01:00 committed by T. Wouters
parent 43c9731334
commit 4f384af067
3 changed files with 180 additions and 150 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Lib/test/test_struct.py
View File

@ -679,6 +679,10 @@ class UnpackIteratorTest(unittest.TestCase):
with self.assertRaises(struct.error): with self.assertRaises(struct.error):
s.iter_unpack(b"12") s.iter_unpack(b"12")
def test_uninstantiable(self):
iter_unpack_type = type(struct.Struct(">ibcp").iter_unpack(b""))
self.assertRaises(TypeError, iter_unpack_type)
def test_iterate(self): def test_iterate(self):
s = struct.Struct('>IB') s = struct.Struct('>IB')
b = bytes(range(1, 16)) b = bytes(range(1, 16))

1
Misc/NEWS.d/next/Core and Builtins/2019-09-09-16-36-37.bpo-38076.C5dVBl.rst Normal file
View File

@ -0,0 +1 @@
The struct module is now PEP-384 compatible

321
Modules/_struct.c
View File

@ -14,7 +14,17 @@ class Struct "PyStructObject *" "&PyStructType"
[clinic start generated code]*/ [clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=9b032058a83ed7c3]*/ /*[clinic end generated code: output=da39a3ee5e6b4b0d input=9b032058a83ed7c3]*/
static PyTypeObject PyStructType; typedef struct {
PyObject *PyStructType;
PyObject *unpackiter_type;
PyObject *StructError;
} _structmodulestate;
#define _structmodulestate(o) ((_structmodulestate *)PyModule_GetState(o))
static struct PyModuleDef _structmodule;
#define _structmodulestate_global _structmodulestate(PyState_FindModule(&_structmodule))
/* The translation function for each format character is table driven */ /* The translation function for each format character is table driven */
typedef struct _formatdef { typedef struct _formatdef {
@ -46,13 +56,8 @@ typedef struct {
} PyStructObject; } PyStructObject;
#define PyStruct_Check(op) PyObject_TypeCheck(op, &PyStructType) #define PyStruct_Check(op) PyObject_TypeCheck(op, (PyTypeObject *)_structmodulestate_global->PyStructType)
#define PyStruct_CheckExact(op) (Py_TYPE(op) == &PyStructType) #define PyStruct_CheckExact(op) (Py_TYPE(op) == (PyTypeObject *)_structmodulestate_global->PyStructType)
/* Exception */
static PyObject *StructError;
/* Define various structs to figure out the alignments of types */ /* Define various structs to figure out the alignments of types */
@ -115,7 +120,7 @@ get_pylong(PyObject *v)
return NULL; return NULL;
} }
else { else {
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"required argument is not an integer"); "required argument is not an integer");
return NULL; return NULL;
} }
@ -143,7 +148,7 @@ get_long(PyObject *v, long *p)
Py_DECREF(v); Py_DECREF(v);
if (x == (long)-1 && PyErr_Occurred()) { if (x == (long)-1 && PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) if (PyErr_ExceptionMatches(PyExc_OverflowError))
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"argument out of range"); "argument out of range");
return -1; return -1;
} }
@ -167,7 +172,7 @@ get_ulong(PyObject *v, unsigned long *p)
Py_DECREF(v); Py_DECREF(v);
if (x == (unsigned long)-1 && PyErr_Occurred()) { if (x == (unsigned long)-1 && PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) if (PyErr_ExceptionMatches(PyExc_OverflowError))
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"argument out of range"); "argument out of range");
return -1; return -1;
} }
@ -190,7 +195,7 @@ get_longlong(PyObject *v, long long *p)
Py_DECREF(v); Py_DECREF(v);
if (x == (long long)-1 && PyErr_Occurred()) { if (x == (long long)-1 && PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) if (PyErr_ExceptionMatches(PyExc_OverflowError))
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"argument out of range"); "argument out of range");
return -1; return -1;
} }
@ -213,7 +218,7 @@ get_ulonglong(PyObject *v, unsigned long long *p)
Py_DECREF(v); Py_DECREF(v);
if (x == (unsigned long long)-1 && PyErr_Occurred()) { if (x == (unsigned long long)-1 && PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) if (PyErr_ExceptionMatches(PyExc_OverflowError))
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"argument out of range"); "argument out of range");
return -1; return -1;
} }
@ -236,7 +241,7 @@ get_ssize_t(PyObject *v, Py_ssize_t *p)
Py_DECREF(v); Py_DECREF(v);
if (x == (Py_ssize_t)-1 && PyErr_Occurred()) { if (x == (Py_ssize_t)-1 && PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) if (PyErr_ExceptionMatches(PyExc_OverflowError))
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"argument out of range"); "argument out of range");
return -1; return -1;
} }
@ -259,7 +264,7 @@ get_size_t(PyObject *v, size_t *p)
Py_DECREF(v); Py_DECREF(v);
if (x == (size_t)-1 && PyErr_Occurred()) { if (x == (size_t)-1 && PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) if (PyErr_ExceptionMatches(PyExc_OverflowError))
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"argument out of range"); "argument out of range");
return -1; return -1;
} }
@ -293,7 +298,7 @@ pack_halffloat(char *p, /* start of 2-byte string */
{ {
double x = PyFloat_AsDouble(v); double x = PyFloat_AsDouble(v);
if (x == -1.0 && PyErr_Occurred()) { if (x == -1.0 && PyErr_Occurred()) {
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"required argument is not a float"); "required argument is not a float");
return -1; return -1;
} }
@ -339,13 +344,13 @@ _range_error(const formatdef *f, int is_unsigned)
const size_t ulargest = (size_t)-1 >> ((SIZEOF_SIZE_T - f->size)*8); const size_t ulargest = (size_t)-1 >> ((SIZEOF_SIZE_T - f->size)*8);
assert(f->size >= 1 && f->size <= SIZEOF_SIZE_T); assert(f->size >= 1 && f->size <= SIZEOF_SIZE_T);
if (is_unsigned) if (is_unsigned)
PyErr_Format(StructError, PyErr_Format(_structmodulestate_global->StructError,
"'%c' format requires 0 <= number <= %zu", "'%c' format requires 0 <= number <= %zu",
f->format, f->format,
ulargest); ulargest);
else { else {
const Py_ssize_t largest = (Py_ssize_t)(ulargest >> 1); const Py_ssize_t largest = (Py_ssize_t)(ulargest >> 1);
PyErr_Format(StructError, PyErr_Format(_structmodulestate_global->StructError,
"'%c' format requires %zd <= number <= %zd", "'%c' format requires %zd <= number <= %zd",
f->format, f->format,
~ largest, ~ largest,
@ -524,7 +529,7 @@ np_byte(char *p, PyObject *v, const formatdef *f)
if (get_long(v, &x) < 0) if (get_long(v, &x) < 0)
return -1; return -1;
if (x < -128 || x > 127) { if (x < -128 || x > 127) {
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"byte format requires -128 <= number <= 127"); "byte format requires -128 <= number <= 127");
return -1; return -1;
} }
@ -539,7 +544,7 @@ np_ubyte(char *p, PyObject *v, const formatdef *f)
if (get_long(v, &x) < 0) if (get_long(v, &x) < 0)
return -1; return -1;
if (x < 0 || x > 255) { if (x < 0 || x > 255) {
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"ubyte format requires 0 <= number <= 255"); "ubyte format requires 0 <= number <= 255");
return -1; return -1;
} }
@ -550,8 +555,8 @@ np_ubyte(char *p, PyObject *v, const formatdef *f)
static int static int
np_char(char *p, PyObject *v, const formatdef *f) np_char(char *p, PyObject *v, const formatdef *f)
{ {
if (!PyBytes_Check(v) || PyBytes_GET_SIZE(v) != 1) { if (!PyBytes_Check(v) || PyBytes_Size(v) != 1) {
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"char format requires a bytes object of length 1"); "char format requires a bytes object of length 1");
return -1; return -1;
} }
@ -567,7 +572,7 @@ np_short(char *p, PyObject *v, const formatdef *f)
if (get_long(v, &x) < 0) if (get_long(v, &x) < 0)
return -1; return -1;
if (x < SHRT_MIN || x > SHRT_MAX) { if (x < SHRT_MIN || x > SHRT_MAX) {
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"short format requires " Py_STRINGIFY(SHRT_MIN) "short format requires " Py_STRINGIFY(SHRT_MIN)
" <= number <= " Py_STRINGIFY(SHRT_MAX)); " <= number <= " Py_STRINGIFY(SHRT_MAX));
return -1; return -1;
@ -585,7 +590,7 @@ np_ushort(char *p, PyObject *v, const formatdef *f)
if (get_long(v, &x) < 0) if (get_long(v, &x) < 0)
return -1; return -1;
if (x < 0 || x > USHRT_MAX) { if (x < 0 || x > USHRT_MAX) {
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"ushort format requires 0 <= number <= " "ushort format requires 0 <= number <= "
Py_STRINGIFY(USHRT_MAX)); Py_STRINGIFY(USHRT_MAX));
return -1; return -1;
@ -716,7 +721,7 @@ np_float(char *p, PyObject *v, const formatdef *f)
{ {
float x = (float)PyFloat_AsDouble(v); float x = (float)PyFloat_AsDouble(v);
if (x == -1 && PyErr_Occurred()) { if (x == -1 && PyErr_Occurred()) {
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"required argument is not a float"); "required argument is not a float");
return -1; return -1;
} }
@ -729,7 +734,7 @@ np_double(char *p, PyObject *v, const formatdef *f)
{ {
double x = PyFloat_AsDouble(v); double x = PyFloat_AsDouble(v);
if (x == -1 && PyErr_Occurred()) { if (x == -1 && PyErr_Occurred()) {
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"required argument is not a float"); "required argument is not a float");
return -1; return -1;
} }
@ -948,7 +953,7 @@ bp_float(char *p, PyObject *v, const formatdef *f)
{ {
double x = PyFloat_AsDouble(v); double x = PyFloat_AsDouble(v);
if (x == -1 && PyErr_Occurred()) { if (x == -1 && PyErr_Occurred()) {
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"required argument is not a float"); "required argument is not a float");
return -1; return -1;
} }
@ -960,7 +965,7 @@ bp_double(char *p, PyObject *v, const formatdef *f)
{ {
double x = PyFloat_AsDouble(v); double x = PyFloat_AsDouble(v);
if (x == -1 && PyErr_Occurred()) { if (x == -1 && PyErr_Occurred()) {
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"required argument is not a float"); "required argument is not a float");
return -1; return -1;
} }
@ -1163,7 +1168,7 @@ lp_float(char *p, PyObject *v, const formatdef *f)
{ {
double x = PyFloat_AsDouble(v); double x = PyFloat_AsDouble(v);
if (x == -1 && PyErr_Occurred()) { if (x == -1 && PyErr_Occurred()) {
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"required argument is not a float"); "required argument is not a float");
return -1; return -1;
} }
@ -1175,7 +1180,7 @@ lp_double(char *p, PyObject *v, const formatdef *f)
{ {
double x = PyFloat_AsDouble(v); double x = PyFloat_AsDouble(v);
if (x == -1 && PyErr_Occurred()) { if (x == -1 && PyErr_Occurred()) {
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"required argument is not a float"); "required argument is not a float");
return -1; return -1;
} }
@ -1242,7 +1247,7 @@ getentry(int c, const formatdef *f)
return f; return f;
} }
} }
PyErr_SetString(StructError, "bad char in struct format"); PyErr_SetString(_structmodulestate_global->StructError, "bad char in struct format");
return NULL; return NULL;
} }
@ -1307,7 +1312,7 @@ prepare_s(PyStructObject *self)
num = num*10 + (c - '0'); num = num*10 + (c - '0');
} }
if (c == '\0') { if (c == '\0') {
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"repeat count given without format specifier"); "repeat count given without format specifier");
return -1; return -1;
} }
@ -1397,7 +1402,7 @@ prepare_s(PyStructObject *self)
return 0; return 0;
overflow: overflow:
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"total struct size too long"); "total struct size too long");
return -1; return -1;
} }
@ -1407,9 +1412,11 @@ s_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{ {
PyObject *self; PyObject *self;
assert(type != NULL && type->tp_alloc != NULL); assert(type != NULL);
allocfunc alloc_func = PyType_GetSlot(type, Py_tp_alloc);
assert(alloc_func != NULL);
self = type->tp_alloc(type, 0); self = alloc_func(type, 0);
if (self != NULL) { if (self != NULL) {
PyStructObject *s = (PyStructObject*)self; PyStructObject *s = (PyStructObject*)self;
Py_INCREF(Py_None); Py_INCREF(Py_None);
@ -1455,7 +1462,7 @@ Struct___init___impl(PyStructObject *self, PyObject *format)
PyErr_Format(PyExc_TypeError, PyErr_Format(PyExc_TypeError,
"Struct() argument 1 must be a str or bytes object, " "Struct() argument 1 must be a str or bytes object, "
"not %.200s", "not %.200s",
Py_TYPE(format)->tp_name); _PyType_Name(Py_TYPE(format)));
return -1; return -1;
} }
@ -1468,13 +1475,16 @@ Struct___init___impl(PyStructObject *self, PyObject *format)
static void static void
s_dealloc(PyStructObject *s) s_dealloc(PyStructObject *s)
{ {
PyTypeObject *tp = Py_TYPE(s);
if (s->weakreflist != NULL) if (s->weakreflist != NULL)
PyObject_ClearWeakRefs((PyObject *)s); PyObject_ClearWeakRefs((PyObject *)s);
if (s->s_codes != NULL) { if (s->s_codes != NULL) {
PyMem_FREE(s->s_codes); PyMem_FREE(s->s_codes);
} }
Py_DECREF(s->s_format); Py_XDECREF(s->s_format);
Py_TYPE(s)->tp_free((PyObject *)s); freefunc free_func = PyType_GetSlot(Py_TYPE(s), Py_tp_free);
free_func(s);
Py_DECREF(tp);
} }
static PyObject * static PyObject *
@ -1535,7 +1545,7 @@ Struct_unpack_impl(PyStructObject *self, Py_buffer *buffer)
{ {
assert(self->s_codes != NULL); assert(self->s_codes != NULL);
if (buffer->len != self->s_size) { if (buffer->len != self->s_size) {
PyErr_Format(StructError, PyErr_Format(_structmodulestate_global->StructError,
"unpack requires a buffer of %zd bytes", "unpack requires a buffer of %zd bytes",
self->s_size); self->s_size);
return NULL; return NULL;
@ -1568,7 +1578,7 @@ Struct_unpack_from_impl(PyStructObject *self, Py_buffer *buffer,
if (offset < 0) { if (offset < 0) {
if (offset + self->s_size > 0) { if (offset + self->s_size > 0) {
PyErr_Format(StructError, PyErr_Format(_structmodulestate_global->StructError,
"not enough data to unpack %zd bytes at offset %zd", "not enough data to unpack %zd bytes at offset %zd",
self->s_size, self->s_size,
offset); offset);
@ -1576,7 +1586,7 @@ Struct_unpack_from_impl(PyStructObject *self, Py_buffer *buffer,
} }
if (offset + buffer->len < 0) { if (offset + buffer->len < 0) {
PyErr_Format(StructError, PyErr_Format(_structmodulestate_global->StructError,
"offset %zd out of range for %zd-byte buffer", "offset %zd out of range for %zd-byte buffer",
offset, offset,
buffer->len); buffer->len);
@ -1586,7 +1596,7 @@ Struct_unpack_from_impl(PyStructObject *self, Py_buffer *buffer,
} }
if ((buffer->len - offset) < self->s_size) { if ((buffer->len - offset) < self->s_size) {
PyErr_Format(StructError, PyErr_Format(_structmodulestate_global->StructError,
"unpack_from requires a buffer of at least %zu bytes for " "unpack_from requires a buffer of at least %zu bytes for "
"unpacking %zd bytes at offset %zd " "unpacking %zd bytes at offset %zd "
"(actual buffer size is %zd)", "(actual buffer size is %zd)",
@ -1614,10 +1624,12 @@ static void
unpackiter_dealloc(unpackiterobject *self) unpackiter_dealloc(unpackiterobject *self)
{ {
/* bpo-31095: UnTrack is needed before calling any callbacks */ /* bpo-31095: UnTrack is needed before calling any callbacks */
PyTypeObject *tp = Py_TYPE(self);
PyObject_GC_UnTrack(self); PyObject_GC_UnTrack(self);
Py_XDECREF(self->so); Py_XDECREF(self->so);
PyBuffer_Release(&self->buf); PyBuffer_Release(&self->buf);
PyObject_GC_Del(self); PyObject_GC_Del(self);
Py_DECREF(tp);
} }
static int static int
@ -1663,35 +1675,28 @@ unpackiter_iternext(unpackiterobject *self)
return result; return result;
} }
static PyTypeObject unpackiter_type = { PyObject *unpackiter_new(PyTypeObject *type, PyObject *args, PyObject *kwds) {
PyVarObject_HEAD_INIT(NULL, 0) PyErr_Format(PyExc_TypeError, "Cannot create '%.200s objects", _PyType_Name(type));
"unpack_iterator", /* tp_name */ return NULL;
sizeof(unpackiterobject), /* tp_basicsize */ }
0, /* tp_itemsize */
(destructor)unpackiter_dealloc, /* tp_dealloc */ static PyType_Slot unpackiter_type_slots[] = {
0, /* tp_vectorcall_offset */ {Py_tp_dealloc, unpackiter_dealloc},
0, /* tp_getattr */ {Py_tp_getattro, PyObject_GenericGetAttr},
0, /* tp_setattr */ {Py_tp_traverse, unpackiter_traverse},
0, /* tp_as_async */ {Py_tp_iter, PyObject_SelfIter},
0, /* tp_repr */ {Py_tp_iternext, unpackiter_iternext},
0, /* tp_as_number */ {Py_tp_methods, unpackiter_methods},
0, /* tp_as_sequence */ {Py_tp_new, unpackiter_new},
0, /* tp_as_mapping */ {0, 0},
0, /* tp_hash */ };
0, /* tp_call */
0, /* tp_str */ static PyType_Spec unpackiter_type_spec = {
PyObject_GenericGetAttr, /* tp_getattro */ "_struct.unpack_iterator",
0, /* tp_setattro */ sizeof(unpackiterobject),
0, /* tp_as_buffer */ 0,
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
0, /* tp_doc */ unpackiter_type_slots
(traverseproc)unpackiter_traverse, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
PyObject_SelfIter, /* tp_iter */
(iternextfunc)unpackiter_iternext, /* tp_iternext */
unpackiter_methods /* tp_methods */
}; };
/*[clinic input] /*[clinic input]
@ -1717,12 +1722,12 @@ Struct_iter_unpack(PyStructObject *self, PyObject *buffer)
assert(self->s_codes != NULL); assert(self->s_codes != NULL);
if (self->s_size == 0) { if (self->s_size == 0) {
PyErr_Format(StructError, PyErr_Format(_structmodulestate_global->StructError,
"cannot iteratively unpack with a struct of length 0"); "cannot iteratively unpack with a struct of length 0");
return NULL; return NULL;
} }
iter = (unpackiterobject *) PyType_GenericAlloc(&unpackiter_type, 0); iter = (unpackiterobject *) PyType_GenericAlloc((PyTypeObject *)_structmodulestate_global->unpackiter_type, 0);
if (iter == NULL) if (iter == NULL)
return NULL; return NULL;
@ -1731,7 +1736,7 @@ Struct_iter_unpack(PyStructObject *self, PyObject *buffer)
return NULL; return NULL;
} }
if (iter->buf.len % self->s_size != 0) { if (iter->buf.len % self->s_size != 0) {
PyErr_Format(StructError, PyErr_Format(_structmodulestate_global->StructError,
"iterative unpacking requires a buffer of " "iterative unpacking requires a buffer of "
"a multiple of %zd bytes", "a multiple of %zd bytes",
self->s_size); self->s_size);
@ -1777,7 +1782,7 @@ s_pack_internal(PyStructObject *soself, PyObject *const *args, int offset, char*
void *p; void *p;
isstring = PyBytes_Check(v); isstring = PyBytes_Check(v);
if (!isstring && !PyByteArray_Check(v)) { if (!isstring && !PyByteArray_Check(v)) {
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"argument for 's' must be a bytes object"); "argument for 's' must be a bytes object");
return -1; return -1;
} }
@ -1799,7 +1804,7 @@ s_pack_internal(PyStructObject *soself, PyObject *const *args, int offset, char*
void *p; void *p;
isstring = PyBytes_Check(v); isstring = PyBytes_Check(v);
if (!isstring && !PyByteArray_Check(v)) { if (!isstring && !PyByteArray_Check(v)) {
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"argument for 'p' must be a bytes object"); "argument for 'p' must be a bytes object");
return -1; return -1;
} }
@ -1821,7 +1826,7 @@ s_pack_internal(PyStructObject *soself, PyObject *const *args, int offset, char*
} else { } else {
if (e->pack(res, v, e) < 0) { if (e->pack(res, v, e) < 0) {
if (PyLong_Check(v) && PyErr_ExceptionMatches(PyExc_OverflowError)) if (PyLong_Check(v) && PyErr_ExceptionMatches(PyExc_OverflowError))
PyErr_SetString(StructError, PyErr_SetString(_structmodulestate_global->StructError,
"int too large to convert"); "int too large to convert");
return -1; return -1;
} }
@ -1845,8 +1850,8 @@ strings.");
static PyObject * static PyObject *
s_pack(PyObject *self, PyObject *const *args, Py_ssize_t nargs) s_pack(PyObject *self, PyObject *const *args, Py_ssize_t nargs)
{ {
char *buf;
PyStructObject *soself; PyStructObject *soself;
PyObject *result;
/* Validate arguments. */ /* Validate arguments. */
soself = (PyStructObject *)self; soself = (PyStructObject *)self;
@ -1854,23 +1859,27 @@ s_pack(PyObject *self, PyObject *const *args, Py_ssize_t nargs)
assert(soself->s_codes != NULL); assert(soself->s_codes != NULL);
if (nargs != soself->s_len) if (nargs != soself->s_len)
{ {
PyErr_Format(StructError, PyErr_Format(_structmodulestate_global->StructError,
"pack expected %zd items for packing (got %zd)", soself->s_len, nargs); "pack expected %zd items for packing (got %zd)", soself->s_len, nargs);
return NULL; return NULL;
} }
/* Allocate a new buffer */ /* Allocate a new string */
result = PyBytes_FromStringAndSize((char *)NULL, soself->s_size); _PyBytesWriter writer;
if (result == NULL) _PyBytesWriter_Init(&writer);
return NULL; buf = _PyBytesWriter_Alloc(&writer, soself->s_size);
if (buf == NULL) {
/* Call the guts */ _PyBytesWriter_Dealloc(&writer);
if ( s_pack_internal(soself, args, 0, PyBytes_AS_STRING(result)) != 0 ) {
Py_DECREF(result);
return NULL; return NULL;
} }
return result; /* Call the guts */
if ( s_pack_internal(soself, args, 0, buf) != 0 ) {
_PyBytesWriter_Dealloc(&writer);
return NULL;
}
return _PyBytesWriter_Finish(&writer, buf + soself->s_size);
} }
PyDoc_STRVAR(s_pack_into__doc__, PyDoc_STRVAR(s_pack_into__doc__,
@ -1895,15 +1904,15 @@ s_pack_into(PyObject *self, PyObject *const *args, Py_ssize_t nargs)
if (nargs != (soself->s_len + 2)) if (nargs != (soself->s_len + 2))
{ {
if (nargs == 0) { if (nargs == 0) {
PyErr_Format(StructError, PyErr_Format(_structmodulestate_global->StructError,
"pack_into expected buffer argument"); "pack_into expected buffer argument");
} }
else if (nargs == 1) { else if (nargs == 1) {
PyErr_Format(StructError, PyErr_Format(_structmodulestate_global->StructError,
"pack_into expected offset argument"); "pack_into expected offset argument");
} }
else { else {
PyErr_Format(StructError, PyErr_Format(_structmodulestate_global->StructError,
"pack_into expected %zd items for packing (got %zd)", "pack_into expected %zd items for packing (got %zd)",
soself->s_len, (nargs - 2)); soself->s_len, (nargs - 2));
} }
@ -1926,7 +1935,7 @@ s_pack_into(PyObject *self, PyObject *const *args, Py_ssize_t nargs)
if (offset < 0) { if (offset < 0) {
/* Check that negative offset is low enough to fit data */ /* Check that negative offset is low enough to fit data */
if (offset + soself->s_size > 0) { if (offset + soself->s_size > 0) {
PyErr_Format(StructError, PyErr_Format(_structmodulestate_global->StructError,
"no space to pack %zd bytes at offset %zd", "no space to pack %zd bytes at offset %zd",
soself->s_size, soself->s_size,
offset); offset);
@ -1936,7 +1945,7 @@ s_pack_into(PyObject *self, PyObject *const *args, Py_ssize_t nargs)
/* Check that negative offset is not crossing buffer boundary */ /* Check that negative offset is not crossing buffer boundary */
if (offset + buffer.len < 0) { if (offset + buffer.len < 0) {
PyErr_Format(StructError, PyErr_Format(_structmodulestate_global->StructError,
"offset %zd out of range for %zd-byte buffer", "offset %zd out of range for %zd-byte buffer",
offset, offset,
buffer.len); buffer.len);
@ -1952,7 +1961,7 @@ s_pack_into(PyObject *self, PyObject *const *args, Py_ssize_t nargs)
assert(offset >= 0); assert(offset >= 0);
assert(soself->s_size >= 0); assert(soself->s_size >= 0);
PyErr_Format(StructError, PyErr_Format(_structmodulestate_global->StructError,
"pack_into requires a buffer of at least %zu bytes for " "pack_into requires a buffer of at least %zu bytes for "
"packing %zd bytes at offset %zd " "packing %zd bytes at offset %zd "
"(actual buffer size is %zd)", "(actual buffer size is %zd)",
@ -2014,6 +2023,11 @@ static struct PyMethodDef s_methods[] = {
{NULL, NULL} /* sentinel */ {NULL, NULL} /* sentinel */
}; };
static PyMemberDef s_members[] = {
{"__weaklistoffset__", T_NONE, offsetof(PyStructObject, weakreflist), READONLY},
{NULL} /* sentinel */
};
#define OFF(x) offsetof(PyStructObject, x) #define OFF(x) offsetof(PyStructObject, x)
static PyGetSetDef s_getsetlist[] = { static PyGetSetDef s_getsetlist[] = {
@ -2022,47 +2036,32 @@ static PyGetSetDef s_getsetlist[] = {
{NULL} /* sentinel */ {NULL} /* sentinel */
}; };
static PyDoc_STRVAR(s__doc__,
PyTypeObject PyStructType = { "Struct(fmt) --> compiled struct object\n"
PyVarObject_HEAD_INIT(NULL, 0) "\n"
"Struct", );
static PyType_Slot PyStructType_slots[] = {
{Py_tp_dealloc, s_dealloc},
{Py_tp_getattro, PyObject_GenericGetAttr},
{Py_tp_setattro, PyObject_GenericSetAttr},
{Py_tp_doc, (void*)s__doc__},
{Py_tp_methods, s_methods},
{Py_tp_members, s_members},
{Py_tp_getset, s_getsetlist},
{Py_tp_init, Struct___init__},
{Py_tp_alloc, PyType_GenericAlloc},
{Py_tp_new, s_new},
{Py_tp_free, PyObject_Del},
{0, 0},
};
static PyType_Spec PyStructType_spec = {
"_struct.Struct",
sizeof(PyStructObject), sizeof(PyStructObject),
0, 0,
(destructor)s_dealloc, /* tp_dealloc */ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
0, /* tp_vectorcall_offset */ PyStructType_slots
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_as_async */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
PyObject_GenericSetAttr, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
Struct___init____doc__, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
offsetof(PyStructObject, weakreflist), /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
s_methods, /* tp_methods */
NULL, /* tp_members */
s_getsetlist, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
Struct___init__, /* tp_init */
PyType_GenericAlloc, /* tp_alloc */
s_new, /* tp_new */
PyObject_Del, /* tp_free */
}; };
@ -2098,7 +2097,7 @@ cache_struct_converter(PyObject *fmt, PyStructObject **ptr)
return 0; return 0;
} }
s_object = _PyObject_CallOneArg((PyObject *)(&PyStructType), fmt); s_object = _PyObject_CallOneArg(_structmodulestate_global->PyStructType, fmt);
if (s_object != NULL) { if (s_object != NULL) {
if (PyDict_GET_SIZE(cache) >= MAXCACHE) if (PyDict_GET_SIZE(cache) >= MAXCACHE)
PyDict_Clear(cache); PyDict_Clear(cache);
@ -2308,16 +2307,40 @@ Whitespace between formats is ignored.\n\
The variable struct.error is an exception raised on errors.\n"); The variable struct.error is an exception raised on errors.\n");
static int
_structmodule_traverse(PyObject *module, visitproc visit, void *arg)
{
Py_VISIT(_structmodulestate(module)->PyStructType);
Py_VISIT(_structmodulestate(module)->unpackiter_type);
Py_VISIT(_structmodulestate(module)->StructError);
return 0;
}
static int
_structmodule_clear(PyObject *module)
{
Py_CLEAR(_structmodulestate(module)->PyStructType);
Py_CLEAR(_structmodulestate(module)->unpackiter_type);
Py_CLEAR(_structmodulestate(module)->StructError);
return 0;
}
static void
_structmodule_free(void *module)
{
_structmodule_clear((PyObject *)module);
}
static struct PyModuleDef _structmodule = { static struct PyModuleDef _structmodule = {
PyModuleDef_HEAD_INIT, PyModuleDef_HEAD_INIT,
"_struct", "_struct",
module_doc, module_doc,
-1, sizeof(_structmodulestate),
module_functions, module_functions,
NULL, NULL,
NULL, _structmodule_traverse,
NULL, _structmodule_clear,
NULL _structmodule_free,
}; };
PyMODINIT_FUNC PyMODINIT_FUNC
@ -2329,12 +2352,19 @@ PyInit__struct(void)
if (m == NULL) if (m == NULL)
return NULL; return NULL;
Py_TYPE(&PyStructType) = &PyType_Type; PyObject *PyStructType = PyType_FromSpec(&PyStructType_spec);
if (PyType_Ready(&PyStructType) < 0) if (PyStructType == NULL) {
return NULL; return NULL;
}
Py_INCREF(PyStructType);
PyModule_AddObject(m, "Struct", PyStructType);
_structmodulestate(m)->PyStructType = PyStructType;
if (PyType_Ready(&unpackiter_type) < 0) PyObject *unpackiter_type = PyType_FromSpec(&unpackiter_type_spec);
if (unpackiter_type == NULL) {
return NULL; return NULL;
}
_structmodulestate(m)->unpackiter_type = unpackiter_type;
/* Check endian and swap in faster functions */ /* Check endian and swap in faster functions */
{ {
@ -2376,17 +2406,12 @@ PyInit__struct(void)
} }
/* Add some symbolic constants to the module */ /* Add some symbolic constants to the module */
if (StructError == NULL) { PyObject *StructError = PyErr_NewException("struct.error", NULL, NULL);
StructError = PyErr_NewException("struct.error", NULL, NULL);
if (StructError == NULL) if (StructError == NULL)
return NULL; return NULL;
}
Py_INCREF(StructError); Py_INCREF(StructError);
PyModule_AddObject(m, "error", StructError); PyModule_AddObject(m, "error", StructError);
_structmodulestate(m)->StructError = StructError;
Py_INCREF((PyObject*)&PyStructType);
PyModule_AddObject(m, "Struct", (PyObject*)&PyStructType);
return m; return m;
} }