#include "Python.h"

#include <ffi.h>

#ifdef MS_WIN32

#include <windows.h>

#include <malloc.h>

#include "ctypes.h"

static int

PyCStgDict_init(StgDictObject *self, PyObject *args, PyObject *kwds)

{

if (PyDict_Type.tp_init((PyObject *)self, args, kwds) < 0)

return -1;

self->format = NULL;

self->ndim = 0;

self->shape = NULL;

return 0;

}

static int

PyCStgDict_clear(StgDictObject *self)

{

Py_CLEAR(self->proto);

Py_CLEAR(self->argtypes);

Py_CLEAR(self->converters);

Py_CLEAR(self->restype);

Py_CLEAR(self->checker);

return 0;

}

static void

PyCStgDict_dealloc(StgDictObject *self)

{

PyCStgDict_clear(self);

PyMem_Free(self->format);

PyMem_Free(self->shape);

PyMem_Free(self->ffi_type_pointer.elements);

PyDict_Type.tp_dealloc((PyObject *)self);

}

static PyObject *

PyCStgDict_sizeof(StgDictObject *self, void *unused)

{

Py_ssize_t res;

res = _PyDict_SizeOf((PyDictObject *)self);

res += sizeof(StgDictObject) - sizeof(PyDictObject);

if (self->format)

res += strlen(self->format) + 1;

res += self->ndim * sizeof(Py_ssize_t);

if (self->ffi_type_pointer.elements)

res += (self->length + 1) * sizeof(ffi_type *);

return PyLong_FromSsize_t(res);

}

PyCStgDict_clone(StgDictObject *dst, StgDictObject *src)

{

char *d, *s;

Py_ssize_t size;

PyCStgDict_clear(dst);

PyMem_Free(dst->ffi_type_pointer.elements);

PyMem_Free(dst->format);

dst->format = NULL;

PyMem_Free(dst->shape);

dst->shape = NULL;

dst->ffi_type_pointer.elements = NULL;

d = (char *)dst;

s = (char *)src;

memcpy(d + sizeof(PyDictObject),

s + sizeof(PyDictObject),

sizeof(StgDictObject) - sizeof(PyDictObject));

Py_XINCREF(dst->proto);

Py_XINCREF(dst->argtypes);

Py_XINCREF(dst->converters);

Py_XINCREF(dst->restype);

Py_XINCREF(dst->checker);

if (src->format) {

dst->format = PyMem_Malloc(strlen(src->format) + 1);

if (dst->format == NULL) {

PyErr_NoMemory();

return -1;

}

strcpy(dst->format, src->format);

}

if (src->shape) {

dst->shape = PyMem_Malloc(sizeof(Py_ssize_t) * src->ndim);

if (dst->shape == NULL) {

PyErr_NoMemory();

return -1;

}

memcpy(dst->shape, src->shape,

sizeof(Py_ssize_t) * src->ndim);

}

if (src->ffi_type_pointer.elements == NULL)

return 0;

size = sizeof(ffi_type *) * (src->length + 1);

dst->ffi_type_pointer.elements = PyMem_Malloc(size);

if (dst->ffi_type_pointer.elements == NULL) {

PyErr_NoMemory();

return -1;

}

memcpy(dst->ffi_type_pointer.elements,

src->ffi_type_pointer.elements,

size);

return 0;

}

static struct PyMethodDef PyCStgDict_methods[] = {

{"__sizeof__", (PyCFunction)PyCStgDict_sizeof, METH_NOARGS},

{NULL, NULL} /* sentinel */

};

PyTypeObject PyCStgDict_Type = {

PyVarObject_HEAD_INIT(NULL, 0)

"StgDict",

sizeof(StgDictObject),

0,

(destructor)PyCStgDict_dealloc, /* tp_dealloc */

0, /* tp_print */

0, /* tp_getattr */

0, /* tp_setattr */

0, /* tp_reserved */

0, /* tp_repr */

0, /* tp_as_number */

0, /* tp_as_sequence */

0, /* tp_as_mapping */

0, /* tp_hash */

0, /* tp_call */

0, /* tp_str */

0, /* tp_getattro */

0, /* tp_setattro */

0, /* tp_as_buffer */

Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */

0, /* tp_doc */

0, /* tp_traverse */

0, /* tp_clear */

0, /* tp_richcompare */

0, /* tp_weaklistoffset */

0, /* tp_iter */

0, /* tp_iternext */

PyCStgDict_methods, /* tp_methods */

0, /* tp_members */

0, /* tp_getset */

0, /* tp_base */

0, /* tp_dict */

0, /* tp_descr_get */

0, /* tp_descr_set */

0, /* tp_dictoffset */

(initproc)PyCStgDict_init, /* tp_init */

0, /* tp_alloc */

0, /* tp_new */

0, /* tp_free */

};

StgDictObject *

PyType_stgdict(PyObject *obj)

{

PyTypeObject *type;

if (!PyType_Check(obj))

return NULL;

type = (PyTypeObject *)obj;

if (!type->tp_dict || !PyCStgDict_CheckExact(type->tp_dict))

return NULL;

return (StgDictObject *)type->tp_dict;

}

StgDictObject *

PyObject_stgdict(PyObject *self)

{

PyTypeObject *type = self->ob_type;

if (!type->tp_dict || !PyCStgDict_CheckExact(type->tp_dict))

return NULL;

return (StgDictObject *)type->tp_dict;

}

static int

MakeFields(PyObject *type, CFieldObject *descr,

Py_ssize_t index, Py_ssize_t offset)

{

Py_ssize_t i;

PyObject *fields;

PyObject *fieldlist;

fields = PyObject_GetAttrString(descr->proto, "_fields_");

if (fields == NULL)

return -1;

fieldlist = PySequence_Fast(fields, "_fields_ must be a sequence");

Py_DECREF(fields);

if (fieldlist == NULL)

return -1;

for (i = 0; i < PySequence_Fast_GET_SIZE(fieldlist); ++i) {

PyObject *fname, *ftype, *bits;

CFieldObject *fdescr;

CFieldObject *new_descr;

/* Convert to PyArg_UnpackTuple... */

PyObject *pair = PySequence_Fast_GetItemRef(fieldlist, i);

if (!PyArg_ParseTuple(pair, "OO|O", &fname, &ftype, &bits)) {

Py_DECREF(pair);

Py_DECREF(fieldlist);

return -1;

}

Py_DECREF(pair);

fdescr = (CFieldObject *)PyObject_GetAttr(descr->proto, fname);

if (fdescr == NULL) {

Py_DECREF(fieldlist);

return -1;

}

if (!Py_TYPE_IS(fdescr, &PyCField_Type)) {

PyErr_SetString(PyExc_TypeError, "unexpected type");

Py_DECREF(fdescr);

Py_DECREF(fieldlist);

return -1;

}

if (fdescr->anonymous) {

int rc = MakeFields(type, fdescr,

index + fdescr->index,

offset + fdescr->offset);

Py_DECREF(fdescr);

if (rc == -1) {

Py_DECREF(fieldlist);

return -1;

}

continue;

}

new_descr = (CFieldObject *)_PyObject_CallNoArg((PyObject *)&PyCField_Type);

if (new_descr == NULL) {

Py_DECREF(fdescr);

Py_DECREF(fieldlist);

return -1;

}

assert(Py_TYPE_IS(new_descr, &PyCField_Type));

new_descr->size = fdescr->size;

new_descr->offset = fdescr->offset + offset;

new_descr->index = fdescr->index + index;

new_descr->proto = fdescr->proto;

Py_XINCREF(new_descr->proto);

new_descr->getfunc = fdescr->getfunc;

new_descr->setfunc = fdescr->setfunc;

Py_DECREF(fdescr);

if (-1 == PyObject_SetAttr(type, fname, (PyObject *)new_descr)) {

Py_DECREF(fieldlist);

Py_DECREF(new_descr);

return -1;

}

Py_DECREF(new_descr);

}

Py_DECREF(fieldlist);

return 0;

}

static int

MakeAnonFields(PyObject *type)

{

PyObject *anon;

PyObject *anon_names;

Py_ssize_t i;

anon = PyObject_GetAttrString(type, "_anonymous_");

if (anon == NULL) {

PyErr_Clear();

return 0;

}

anon_names = PySequence_Fast(anon, "_anonymous_ must be a sequence");

Py_DECREF(anon);

if (anon_names == NULL)

return -1;

for (i = 0; i < PySequence_Fast_GET_SIZE(anon_names); ++i) {

PyObject *fname = PySequence_Fast_GetItemRef(anon_names, i); /* borrowed */

CFieldObject *descr = (CFieldObject *)PyObject_GetAttr(type, fname);

Py_DECREF(fname);

if (descr == NULL) {

Py_DECREF(anon_names);

return -1;

}

if (!Py_TYPE_IS(descr, &PyCField_Type)) {

PyErr_Format(PyExc_AttributeError,

"'%U' is specified in _anonymous_ but not in "

"_fields_",

fname);

Py_DECREF(anon_names);

Py_DECREF(descr);

return -1;

}

descr->anonymous = 1;

/* descr is in the field descriptor. */

if (-1 == MakeFields(type, (CFieldObject *)descr,

((CFieldObject *)descr)->index,

((CFieldObject *)descr)->offset)) {

Py_DECREF(descr);

Py_DECREF(anon_names);

return -1;

}

Py_DECREF(descr);

}

Py_DECREF(anon_names);

return 0;

}

PyCStructUnionType_update_stgdict(PyObject *type, PyObject *fields, int isStruct)

{

StgDictObject *stgdict, *basedict;

Py_ssize_t len, offset, size, align, i;

Py_ssize_t union_size, total_align;

Py_ssize_t field_size = 0;

int bitofs;

PyObject *isPacked;

int pack = 0;

Py_ssize_t ffi_ofs;

int big_endian;

/* HACK Alert: I cannot be bothered to fix ctypes.com, so there has to

int use_broken_old_ctypes_semantics;

if (fields == NULL)

return 0;

#ifdef WORDS_BIGENDIAN

big_endian = PyObject_HasAttrString(type, "_swappedbytes_") ? 0 : 1;

big_endian = PyObject_HasAttrString(type, "_swappedbytes_") ? 1 : 0;

use_broken_old_ctypes_semantics = \

PyObject_HasAttrString(type, "_use_broken_old_ctypes_structure_semantics_");

isPacked = PyObject_GetAttrString(type, "_pack_");

if (isPacked) {

pack = _PyLong_AsInt(isPacked);

if (pack < 0 || PyErr_Occurred()) {

Py_XDECREF(isPacked);

PyErr_SetString(PyExc_ValueError,

"_pack_ must be a non-negative integer");

return -1;

}

Py_DECREF(isPacked);

} else

PyErr_Clear();

len = PySequence_Length(fields);

if (len == -1) {

PyErr_SetString(PyExc_TypeError,

"'_fields_' must be a sequence of pairs");

return -1;

}

stgdict = PyType_stgdict(type);

if (!stgdict)

return -1;

/* If this structure/union is already marked final we cannot assign

if (stgdict->flags & DICTFLAG_FINAL) {/* is final ? */

PyErr_SetString(PyExc_AttributeError,

"_fields_ is final");

return -1;

}

if (stgdict->format) {

PyMem_Free(stgdict->format);

stgdict->format = NULL;

}

if (stgdict->ffi_type_pointer.elements)

PyMem_Free(stgdict->ffi_type_pointer.elements);

basedict = PyType_stgdict((PyObject *)((PyTypeObject *)type)->tp_base);

if (basedict && !use_broken_old_ctypes_semantics) {

size = offset = basedict->size;

align = basedict->align;

union_size = 0;

total_align = align ? align : 1;

stgdict->ffi_type_pointer.type = FFI_TYPE_STRUCT;

stgdict->ffi_type_pointer.elements = PyMem_New(ffi_type *, basedict->length + len + 1);

if (stgdict->ffi_type_pointer.elements == NULL) {

PyErr_NoMemory();

return -1;

}

memset(stgdict->ffi_type_pointer.elements, 0,

sizeof(ffi_type *) * (basedict->length + len + 1));

if (basedict->length > 0) {

memcpy(stgdict->ffi_type_pointer.elements,

basedict->ffi_type_pointer.elements,

sizeof(ffi_type *) * (basedict->length));

}

ffi_ofs = basedict->length;

} else {

offset = 0;

size = 0;

align = 0;

union_size = 0;

total_align = 1;

stgdict->ffi_type_pointer.type = FFI_TYPE_STRUCT;

stgdict->ffi_type_pointer.elements = PyMem_New(ffi_type *, len + 1);

if (stgdict->ffi_type_pointer.elements == NULL) {

PyErr_NoMemory();

return -1;

}

memset(stgdict->ffi_type_pointer.elements, 0,

sizeof(ffi_type *) * (len + 1));

ffi_ofs = 0;

}

assert(stgdict->format == NULL);

if (isStruct && !isPacked) {

stgdict->format = _ctypes_alloc_format_string(NULL, "T{");

} else {

/* PEP3118 doesn't support union, or packed structures (well,

stgdict->format = _ctypes_alloc_format_string(NULL, "B");

}

if (stgdict->format == NULL)

return -1;

#define realdict ((PyObject *)&stgdict->dict)

for (i = 0; i < len; ++i) {

PyObject *name = NULL, *desc = NULL;

PyObject *pair = PySequence_GetItem(fields, i);

PyObject *prop;

StgDictObject *dict;

int bitsize = 0;

if (!pair || !PyArg_ParseTuple(pair, "UO|i", &name, &desc, &bitsize)) {

PyErr_SetString(PyExc_TypeError,

"'_fields_' must be a sequence of (name, C type) pairs");

Py_XDECREF(pair);

return -1;

}

dict = PyType_stgdict(desc);

if (dict == NULL) {

Py_DECREF(pair);

PyErr_Format(PyExc_TypeError,

"second item in _fields_ tuple (index %zd) must be a C type",

i);

return -1;

}

stgdict->ffi_type_pointer.elements[ffi_ofs + i] = &dict->ffi_type_pointer;

if (dict->flags & (TYPEFLAG_ISPOINTER | TYPEFLAG_HASPOINTER))

stgdict->flags |= TYPEFLAG_HASPOINTER;

dict->flags |= DICTFLAG_FINAL; /* mark field type final */

if (PyTuple_Size(pair) == 3) { /* bits specified */

switch(dict->ffi_type_pointer.type) {

case FFI_TYPE_UINT8:

case FFI_TYPE_UINT16:

case FFI_TYPE_UINT32:

case FFI_TYPE_SINT64:

case FFI_TYPE_UINT64:

break;

case FFI_TYPE_SINT8:

case FFI_TYPE_SINT16:

case FFI_TYPE_SINT32:

if (dict->getfunc != _ctypes_get_fielddesc("c")->getfunc

#ifdef CTYPES_UNICODE

&& dict->getfunc != _ctypes_get_fielddesc("u")->getfunc

)

break;

/* else fall through */

default:

PyErr_Format(PyExc_TypeError,

"bit fields not allowed for type %s",

((PyTypeObject *)desc)->tp_name);

Py_DECREF(pair);

return -1;

}

if (bitsize <= 0 || bitsize > dict->size * 8) {

PyErr_SetString(PyExc_ValueError,

"number of bits invalid for bit field");

Py_DECREF(pair);

return -1;

}

} else

bitsize = 0;

if (isStruct && !isPacked) {

const char *fieldfmt = dict->format ? dict->format : "B";

const char *fieldname = PyUnicode_AsUTF8(name);

char *ptr;

Py_ssize_t len;

char *buf;

if (fieldname == NULL)

{

Py_DECREF(pair);

return -1;

}

len = strlen(fieldname) + strlen(fieldfmt);

buf = PyMem_Malloc(len + 2 + 1);

if (buf == NULL) {

Py_DECREF(pair);

PyErr_NoMemory();

return -1;

}

sprintf(buf, "%s:%s:", fieldfmt, fieldname);

ptr = stgdict->format;

if (dict->shape != NULL) {

stgdict->format = _ctypes_alloc_format_string_with_shape(

dict->ndim, dict->shape, stgdict->format, buf);

} else {

stgdict->format = _ctypes_alloc_format_string(stgdict->format, buf);

}

PyMem_Free(ptr);

PyMem_Free(buf);

if (stgdict->format == NULL) {

Py_DECREF(pair);

return -1;

}

}

if (isStruct) {

prop = PyCField_FromDesc(desc, i,

&field_size, bitsize, &bitofs,

&size, &offset, &align,

pack, big_endian);

} else /* union */ {

size = 0;

offset = 0;

align = 0;

prop = PyCField_FromDesc(desc, i,

&field_size, bitsize, &bitofs,

&size, &offset, &align,

pack, big_endian);

union_size = max(size, union_size);

}

total_align = max(align, total_align);

if (!prop) {

Py_DECREF(pair);

return -1;

}

if (-1 == PyObject_SetAttr(type, name, prop)) {

Py_DECREF(prop);

Py_DECREF(pair);

return -1;

}

Py_DECREF(pair);

Py_DECREF(prop);

}

#undef realdict

if (isStruct && !isPacked) {

char *ptr = stgdict->format;

stgdict->format = _ctypes_alloc_format_string(stgdict->format, "}");

PyMem_Free(ptr);

if (stgdict->format == NULL)

return -1;

}

if (!isStruct)

size = union_size;

/* Adjust the size according to the alignment requirements */

size = ((size + total_align - 1) / total_align) * total_align;

stgdict->ffi_type_pointer.alignment = Py_SAFE_DOWNCAST(total_align,

Py_ssize_t,

unsigned short);

stgdict->ffi_type_pointer.size = size;

stgdict->size = size;

stgdict->align = total_align;

stgdict->length = len; /* ADD ffi_ofs? */

/* We did check that this flag was NOT set above, it must not

if (stgdict->flags & DICTFLAG_FINAL) {

PyErr_SetString(PyExc_AttributeError,

"Structure or union cannot contain itself");

return -1;

}

stgdict->flags |= DICTFLAG_FINAL;

return MakeAnonFields(type);

}