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Issue #2389: Implement a portable mechanism for pickling array objects. 

Reviewed by: Martin v. Löwis
This commit is contained in:
Alexandre Vassalotti 2009-07-15 17:49:23 +00:00
parent afd0d11f07
commit ad077154d0
3 changed files with 658 additions and 60 deletions
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150
Lib/test/test_array.py
View File

@ -5,10 +5,16 @@
import unittest
from test import support
from weakref import proxy
import array, io, math
from pickle import loads, dumps, HIGHEST_PROTOCOL
import weakref
import pickle
import operator
import io
import math
import struct
import array
from array import _array_reconstructor as array_reconstructor
class ArraySubclass(array.array):
pass
@ -30,6 +36,123 @@ class BadConstructorTest(unittest.TestCase):
tests.append(BadConstructorTest)
# Machine format codes.
#
# Search for "enum machine_format_code" in Modules/arraymodule.c to get the
# authoritative values.
UNKNOWN_FORMAT = -1
UNSIGNED_INT8 = 0
SIGNED_INT8 = 1
UNSIGNED_INT16_LE = 2
UNSIGNED_INT16_BE = 3
SIGNED_INT16_LE = 4
SIGNED_INT16_BE = 5
UNSIGNED_INT32_LE = 6
UNSIGNED_INT32_BE = 7
SIGNED_INT32_LE = 8
SIGNED_INT32_BE = 9
UNSIGNED_INT64_LE = 10
UNSIGNED_INT64_BE = 11
SIGNED_INT64_LE = 12
SIGNED_INT64_BE = 13
IEEE_754_FLOAT_LE = 14
IEEE_754_FLOAT_BE = 15
IEEE_754_DOUBLE_LE = 16
IEEE_754_DOUBLE_BE = 17
UTF16_LE = 18
UTF16_BE = 19
UTF32_LE = 20
UTF32_BE = 21
class ArrayReconstructorTest(unittest.TestCase):
def test_error(self):
self.assertRaises(TypeError, array_reconstructor,
"", "b", 0, b"")
self.assertRaises(TypeError, array_reconstructor,
str, "b", 0, b"")
self.assertRaises(TypeError, array_reconstructor,
array.array, "b", '', b"")
self.assertRaises(TypeError, array_reconstructor,
array.array, "b", 0, "")
self.assertRaises(ValueError, array_reconstructor,
array.array, "?", 0, b"")
self.assertRaises(ValueError, array_reconstructor,
array.array, "b", UNKNOWN_FORMAT, b"")
self.assertRaises(ValueError, array_reconstructor,
array.array, "b", 22, b"")
self.assertRaises(ValueError, array_reconstructor,
array.array, "d", 16, b"a")
def test_numbers(self):
testcases = (
(['B', 'H', 'I', 'L'], UNSIGNED_INT8, '=BBBB',
[0x80, 0x7f, 0, 0xff]),
(['b', 'h', 'i', 'l'], SIGNED_INT8, '=bbb',
[-0x80, 0x7f, 0]),
(['H', 'I', 'L'], UNSIGNED_INT16_LE, '<HHHH',
[0x8000, 0x7fff, 0, 0xffff]),
(['H', 'I', 'L'], UNSIGNED_INT16_BE, '>HHHH',
[0x8000, 0x7fff, 0, 0xffff]),
(['h', 'i', 'l'], SIGNED_INT16_LE, '<hhh',
[-0x8000, 0x7fff, 0]),
(['h', 'i', 'l'], SIGNED_INT16_BE, '>hhh',
[-0x8000, 0x7fff, 0]),
(['I', 'L'], UNSIGNED_INT32_LE, '<IIII',
[1<<31, (1<<31)-1, 0, (1<<32)-1]),
(['I', 'L'], UNSIGNED_INT32_BE, '>IIII',
[1<<31, (1<<31)-1, 0, (1<<32)-1]),
(['i', 'l'], SIGNED_INT32_LE, '<iii',
[-1<<31, (1<<31)-1, 0]),
(['i', 'l'], SIGNED_INT32_BE, '>iii',
[-1<<31, (1<<31)-1, 0]),
(['L'], UNSIGNED_INT64_LE, '<QQQQ',
[1<<63, (1<<63)-1, 0, (1<<64)-1]),
(['L'], UNSIGNED_INT64_BE, '>QQQQ',
[1<<63, (1<<63)-1, 0, (1<<64)-1]),
(['l'], SIGNED_INT64_LE, '<qqq',
[-1<<63, (1<<63)-1, 0]),
(['l'], SIGNED_INT64_BE, '>qqq',
[-1<<63, (1<<63)-1, 0]),
(['f'], IEEE_754_FLOAT_LE, '<ffff',
[16711938.0, float('inf'), float('-inf'), -0.0]),
(['f'], IEEE_754_FLOAT_BE, '>ffff',
[16711938.0, float('inf'), float('-inf'), -0.0]),
(['d'], IEEE_754_DOUBLE_LE, '<dddd',
[9006104071832581.0, float('inf'), float('-inf'), -0.0]),
(['d'], IEEE_754_DOUBLE_BE, '>dddd',
[9006104071832581.0, float('inf'), float('-inf'), -0.0])
)
for testcase in testcases:
valid_typecodes, mformat_code, struct_fmt, values = testcase
arraystr = struct.pack(struct_fmt, *values)
for typecode in valid_typecodes:
a = array.array(typecode, values)
b = array_reconstructor(
array.array, typecode, mformat_code, arraystr)
self.assertEqual(a, b,
msg="{0!r} != {1!r}; testcase={2!r}".format(a, b, testcase))
def test_unicode(self):
teststr = "Bonne Journ\xe9e \U0002030a\U00020347"
testcases = (
(UTF16_LE, "UTF-16-LE"),
(UTF16_BE, "UTF-16-BE"),
(UTF32_LE, "UTF-32-LE"),
(UTF32_BE, "UTF-32-BE")
)
for testcase in testcases:
mformat_code, encoding = testcase
a = array.array('u', teststr)
b = array_reconstructor(
array.array, 'u', mformat_code, teststr.encode(encoding))
self.assertEqual(a, b,
msg="{0!r} != {1!r}; testcase={2!r}".format(a, b, testcase))
tests.append(ArrayReconstructorTest)
class BaseTest(unittest.TestCase):
# Required class attributes (provided by subclasses
# typecode: the typecode to test
@ -97,31 +220,38 @@ class BaseTest(unittest.TestCase):
self.assertNotEqual(id(a), id(b))
self.assertEqual(a, b)
def test_reduce_ex(self):
a = array.array(self.typecode, self.example)
for protocol in range(3):
self.assert_(a.__reduce_ex__(protocol)[0] is array.array)
for protocol in range(3, pickle.HIGHEST_PROTOCOL):
self.assert_(a.__reduce_ex__(protocol)[0] is array_reconstructor)
def test_pickle(self):
for protocol in range(HIGHEST_PROTOCOL + 1):
for protocol in range(pickle.HIGHEST_PROTOCOL + 1):
a = array.array(self.typecode, self.example)
b = loads(dumps(a, protocol))
b = pickle.loads(pickle.dumps(a, protocol))
self.assertNotEqual(id(a), id(b))
self.assertEqual(a, b)
a = ArraySubclass(self.typecode, self.example)
a.x = 10
b = loads(dumps(a, protocol))
b = pickle.loads(pickle.dumps(a, protocol))
self.assertNotEqual(id(a), id(b))
self.assertEqual(a, b)
self.assertEqual(a.x, b.x)
self.assertEqual(type(a), type(b))
def test_pickle_for_empty_array(self):
for protocol in range(HIGHEST_PROTOCOL + 1):
for protocol in range(pickle.HIGHEST_PROTOCOL + 1):
a = array.array(self.typecode)
b = loads(dumps(a, protocol))
b = pickle.loads(pickle.dumps(a, protocol))
self.assertNotEqual(id(a), id(b))
self.assertEqual(a, b)
a = ArraySubclass(self.typecode)
a.x = 10
b = loads(dumps(a, protocol))
b = pickle.loads(pickle.dumps(a, protocol))
self.assertNotEqual(id(a), id(b))
self.assertEqual(a, b)
self.assertEqual(a.x, b.x)
@ -757,7 +887,7 @@ class BaseTest(unittest.TestCase):
def test_weakref(self):
s = array.array(self.typecode, self.example)
p = proxy(s)
p = weakref.proxy(s)
self.assertEqual(p.tostring(), s.tostring())
s = None
self.assertRaises(ReferenceError, len, p)

4
Misc/NEWS
View File

@ -61,10 +61,12 @@ Library
Extension Modules
-----------------
- Issue #4509: array.array objects are no longer modified after an operation
- Issue #4509: Array objects are no longer modified after an operation
failing due to the resize restriction in-place when the object has exported
buffers.
- Issue #2389: Array objects are now pickled in a portable manner.
Build
-----

564
Modules/arraymodule.c
View File

@ -27,6 +27,8 @@ struct arraydescr {
PyObject * (*getitem)(struct arrayobject *, Py_ssize_t);
int (*setitem)(struct arrayobject *, Py_ssize_t, PyObject *);
char *formats;
int is_integer_type;
int is_signed;
};
typedef struct arrayobject {
@ -389,20 +391,24 @@ d_setitem(arrayobject *ap, Py_ssize_t i, PyObject *v)
}
/* Description of types */
/* Description of types.
*
* Don't forget to update typecode_to_mformat_code() if you add a new
* typecode.
*/
static struct arraydescr descriptors[] = {
{'b', 1, b_getitem, b_setitem, "b"},
{'B', 1, BB_getitem, BB_setitem, "B"},
{'u', sizeof(Py_UNICODE), u_getitem, u_setitem, "u"},
{'h', sizeof(short), h_getitem, h_setitem, "h"},
{'H', sizeof(short), HH_getitem, HH_setitem, "H"},
{'i', sizeof(int), i_getitem, i_setitem, "i"},
{'I', sizeof(int), II_getitem, II_setitem, "I"},
{'l', sizeof(long), l_getitem, l_setitem, "l"},
{'L', sizeof(long), LL_getitem, LL_setitem, "L"},
{'f', sizeof(float), f_getitem, f_setitem, "f"},
{'d', sizeof(double), d_getitem, d_setitem, "d"},
{'\0', 0, 0, 0, 0} /* Sentinel */
{'b', 1, b_getitem, b_setitem, "b", 1, 1},
{'B', 1, BB_getitem, BB_setitem, "B", 1, 0},
{'u', sizeof(Py_UNICODE), u_getitem, u_setitem, "u", 0, 0},
{'h', sizeof(short), h_getitem, h_setitem, "h", 1, 1},
{'H', sizeof(short), HH_getitem, HH_setitem, "H", 1, 0},
{'i', sizeof(int), i_getitem, i_setitem, "i", 1, 1},
{'I', sizeof(int), II_getitem, II_setitem, "I", 1, 0},
{'l', sizeof(long), l_getitem, l_setitem, "l", 1, 1},
{'L', sizeof(long), LL_getitem, LL_setitem, "L", 1, 0},
{'f', sizeof(float), f_getitem, f_setitem, "f", 0, 0},
{'d', sizeof(double), d_getitem, d_setitem, "d", 0, 0},
{'\0', 0, 0, 0, 0, 0, 0} /* Sentinel */
};
/****************************************************************************
@ -1135,40 +1141,6 @@ PyDoc_STRVAR(byteswap_doc,
Byteswap all items of the array. If the items in the array are not 1, 2,\n\
4, or 8 bytes in size, RuntimeError is raised.");
static PyObject *
array_reduce(arrayobject *array)
{
PyObject *dict, *result;
dict = PyObject_GetAttrString((PyObject *)array, "__dict__");
if (dict == NULL) {
PyErr_Clear();
dict = Py_None;
Py_INCREF(dict);
}
if (Py_SIZE(array) > 0) {
if (array->ob_descr->itemsize
> PY_SSIZE_T_MAX / Py_SIZE(array)) {
return PyErr_NoMemory();
}
result = Py_BuildValue("O(Cy#)O",
Py_TYPE(array),
array->ob_descr->typecode,
array->ob_item,
Py_SIZE(array) * array->ob_descr->itemsize,
dict);
} else {
result = Py_BuildValue("O(C)O",
Py_TYPE(array),
array->ob_descr->typecode,
dict);
}
Py_DECREF(dict);
return result;
}
PyDoc_STRVAR(array_doc, "Return state information for pickling.");
static PyObject *
array_reverse(arrayobject *self, PyObject *unused)
{
@ -1475,6 +1447,498 @@ an array of some other type.");
/*********************** Pickling support ************************/
enum machine_format_code {
UNKNOWN_FORMAT = -1,
/* UNKNOWN_FORMAT is used to indicate that the machine format for an
* array type code cannot be interpreted. When this occurs, a list of
* Python objects is used to represent the content of the array
* instead of using the memory content of the array directly. In that
* case, the array_reconstructor mechanism is bypassed completely, and
* the standard array constructor is used instead.
*
* This is will most likely occur when the machine doesn't use IEEE
* floating-point numbers.
*/
UNSIGNED_INT8 = 0,
SIGNED_INT8 = 1,
UNSIGNED_INT16_LE = 2,
UNSIGNED_INT16_BE = 3,
SIGNED_INT16_LE = 4,
SIGNED_INT16_BE = 5,
UNSIGNED_INT32_LE = 6,
UNSIGNED_INT32_BE = 7,
SIGNED_INT32_LE = 8,
SIGNED_INT32_BE = 9,
UNSIGNED_INT64_LE = 10,
UNSIGNED_INT64_BE = 11,
SIGNED_INT64_LE = 12,
SIGNED_INT64_BE = 13,
IEEE_754_FLOAT_LE = 14,
IEEE_754_FLOAT_BE = 15,
IEEE_754_DOUBLE_LE = 16,
IEEE_754_DOUBLE_BE = 17,
UTF16_LE = 18,
UTF16_BE = 19,
UTF32_LE = 20,
UTF32_BE = 21
};
#define MACHINE_FORMAT_CODE_MIN 0
#define MACHINE_FORMAT_CODE_MAX 21
static const struct mformatdescr {
size_t size;
int is_signed;
int is_big_endian;
} mformat_descriptors[] = {
{1, 0, 0}, /* 0: UNSIGNED_INT8 */
{1, 1, 0}, /* 1: SIGNED_INT8 */
{2, 0, 0}, /* 2: UNSIGNED_INT16_LE */
{2, 0, 1}, /* 3: UNSIGNED_INT16_BE */
{2, 1, 0}, /* 4: SIGNED_INT16_LE */
{2, 1, 1}, /* 5: SIGNED_INT16_BE */
{4, 0, 0}, /* 6: UNSIGNED_INT32_LE */
{4, 0, 1}, /* 7: UNSIGNED_INT32_BE */
{4, 1, 0}, /* 8: SIGNED_INT32_LE */
{4, 1, 1}, /* 9: SIGNED_INT32_BE */
{8, 0, 0}, /* 10: UNSIGNED_INT64_LE */
{8, 0, 1}, /* 11: UNSIGNED_INT64_BE */
{8, 1, 0}, /* 12: SIGNED_INT64_LE */
{8, 1, 1}, /* 13: SIGNED_INT64_BE */
{4, 0, 0}, /* 14: IEEE_754_FLOAT_LE */
{4, 0, 1}, /* 15: IEEE_754_FLOAT_BE */
{8, 0, 0}, /* 16: IEEE_754_DOUBLE_LE */
{8, 0, 1}, /* 17: IEEE_754_DOUBLE_BE */
{4, 0, 0}, /* 18: UTF16_LE */
{4, 0, 1}, /* 19: UTF16_BE */
{8, 0, 0}, /* 20: UTF32_LE */
{8, 0, 1} /* 21: UTF32_BE */
};
/*
* Internal: This function is used to find the machine format of a given
* array type code. This returns UNKNOWN_FORMAT when the machine format cannot
* be found.
*/
static enum machine_format_code
typecode_to_mformat_code(int typecode)
{
#ifdef BYTEORDER_IS_BIG_ENDIAN
const int is_big_endian = 1;
#else
const int is_big_endian = 0;
#endif
size_t intsize;
int is_signed;
switch (typecode) {
case 'b':
return SIGNED_INT8;
case 'B':
return UNSIGNED_INT8;
case 'u':
if (sizeof(Py_UNICODE) == 2) {
return UTF16_LE + is_big_endian;
}
if (sizeof(Py_UNICODE) == 4) {
return UTF32_LE + is_big_endian;
}
return UNKNOWN_FORMAT;
case 'f':
if (sizeof(float) == 4) {
const float y = 16711938.0;
if (memcmp(&y, "\x4b\x7f\x01\x02", 4) == 0)
return IEEE_754_FLOAT_BE;
if (memcmp(&y, "\x02\x01\x7f\x4b", 4) == 0)
return IEEE_754_FLOAT_LE;
}
return UNKNOWN_FORMAT;
case 'd':
if (sizeof(double) == 8) {
const double x = 9006104071832581.0;
if (memcmp(&x, "\x43\x3f\xff\x01\x02\x03\x04\x05", 8) == 0)
return IEEE_754_DOUBLE_BE;
if (memcmp(&x, "\x05\x04\x03\x02\x01\xff\x3f\x43", 8) == 0)
return IEEE_754_DOUBLE_LE;
}
return UNKNOWN_FORMAT;
/* Integers */
case 'h':
intsize = sizeof(short);
is_signed = 1;
break;
case 'H':
intsize = sizeof(short);
is_signed = 0;
break;
case 'i':
intsize = sizeof(int);
is_signed = 1;
break;
case 'I':
intsize = sizeof(int);
is_signed = 0;
break;
case 'l':
intsize = sizeof(long);
is_signed = 1;
break;
case 'L':
intsize = sizeof(long);
is_signed = 0;
break;
default:
return UNKNOWN_FORMAT;
}
switch (intsize) {
case 2:
return UNSIGNED_INT16_LE + is_big_endian + (2 * is_signed);
case 4:
return UNSIGNED_INT32_LE + is_big_endian + (2 * is_signed);
case 8:
return UNSIGNED_INT64_LE + is_big_endian + (2 * is_signed);
default:
return UNKNOWN_FORMAT;
}
}
/* Forward declaration. */
static PyObject *array_new(PyTypeObject *type, PyObject *args, PyObject *kwds);
/*
* Internal: This function wraps the array constructor--i.e., array_new()--to
* allow the creation of array objects from C code without having to deal
* directly the tuple argument of array_new(). The typecode argument is a
* Unicode character value, like 'i' or 'f' for example, representing an array
* type code. The items argument is a bytes or a list object from which
* contains the initial value of the array.
*
* On success, this functions returns the array object created. Otherwise,
* NULL is returned to indicate a failure.
*/
static PyObject *
make_array(PyTypeObject *arraytype, int typecode, PyObject *items)
{
PyObject *new_args;
PyObject *array_obj;
PyObject *typecode_obj;
Py_UNICODE typecode_str[1] = {typecode};
assert(arraytype != NULL);
assert(items != NULL);
typecode_obj = PyUnicode_FromUnicode(typecode_str, 1);
if (typecode_obj == NULL)
return NULL;
new_args = PyTuple_New(2);
if (new_args == NULL)
return NULL;
Py_INCREF(items);
PyTuple_SET_ITEM(new_args, 0, typecode_obj);
PyTuple_SET_ITEM(new_args, 1, items);
array_obj = array_new(arraytype, new_args, NULL);
Py_DECREF(new_args);
if (array_obj == NULL)
return NULL;
return array_obj;
}
/*
* This functions is a special constructor used when unpickling an array. It
* provides a portable way to rebuild an array from its memory representation.
*/
static PyObject *
array_reconstructor(PyObject *self, PyObject *args)
{
PyTypeObject *arraytype;
PyObject *items;
PyObject *converted_items;
PyObject *result;
int typecode;
enum machine_format_code mformat_code;
struct arraydescr *descr;
if (!PyArg_ParseTuple(args, "OCiO:array._array_reconstructor",
&arraytype, &typecode, &mformat_code, &items))
return NULL;
if (!PyType_Check(arraytype)) {
PyErr_Format(PyExc_TypeError,
"first argument must a type object, not %.200s",
Py_TYPE(arraytype)->tp_name);
return NULL;
}
if (!PyType_IsSubtype(arraytype, &Arraytype)) {
PyErr_Format(PyExc_TypeError,
"%.200s is not a subtype of %.200s",
arraytype->tp_name, Arraytype.tp_name);
return NULL;
}
for (descr = descriptors; descr->typecode != '\0'; descr++) {
if (descr->typecode == typecode)
break;
}
if (descr->typecode == '\0') {
PyErr_SetString(PyExc_ValueError,
"second argument must be a valid type code");
return NULL;
}
if (mformat_code < MACHINE_FORMAT_CODE_MIN ||
mformat_code > MACHINE_FORMAT_CODE_MAX) {
PyErr_SetString(PyExc_ValueError,
"third argument must be a valid machine format code.");
return NULL;
}
if (!PyBytes_Check(items)) {
PyErr_Format(PyExc_TypeError,
"fourth argument should be bytes, not %.200s",
Py_TYPE(items)->tp_name);
return NULL;
}
/* Fast path: No decoding has to be done. */
if (mformat_code == typecode_to_mformat_code(typecode) ||
mformat_code == UNKNOWN_FORMAT) {
return make_array(arraytype, typecode, items);
}
/* Slow path: Decode the byte string according to the given machine
* format code. This occurs when the computer unpickling the array
* object is architecturally different from the one that pickled the
* array.
*/
if (Py_SIZE(items) % mformat_descriptors[mformat_code].size != 0) {
PyErr_SetString(PyExc_ValueError,
"string length not a multiple of item size");
return NULL;
}
switch (mformat_code) {
case IEEE_754_FLOAT_LE:
case IEEE_754_FLOAT_BE: {
int i;
int le = (mformat_code == IEEE_754_FLOAT_LE) ? 1 : 0;
Py_ssize_t itemcount = Py_SIZE(items) / 4;
const unsigned char *memstr =
(unsigned char *)PyBytes_AS_STRING(items);
converted_items = PyList_New(itemcount);
if (converted_items == NULL)
return NULL;
for (i = 0; i < itemcount; i++) {
PyObject *pyfloat = PyFloat_FromDouble(
_PyFloat_Unpack4(&memstr[i * 4], le));
if (pyfloat == NULL) {
Py_DECREF(converted_items);
return NULL;
}
PyList_SET_ITEM(converted_items, i, pyfloat);
}
break;
}
case IEEE_754_DOUBLE_LE:
case IEEE_754_DOUBLE_BE: {
int i;
int le = (mformat_code == IEEE_754_DOUBLE_LE) ? 1 : 0;
Py_ssize_t itemcount = Py_SIZE(items) / 8;
const unsigned char *memstr =
(unsigned char *)PyBytes_AS_STRING(items);
converted_items = PyList_New(itemcount);
if (converted_items == NULL)
return NULL;
for (i = 0; i < itemcount; i++) {
PyObject *pyfloat = PyFloat_FromDouble(
_PyFloat_Unpack8(&memstr[i * 8], le));
if (pyfloat == NULL) {
Py_DECREF(converted_items);
return NULL;
}
PyList_SET_ITEM(converted_items, i, pyfloat);
}
break;
}
case UTF16_LE:
case UTF16_BE: {
int byteorder = (mformat_code == UTF16_LE) ? -1 : 1;
converted_items = PyUnicode_DecodeUTF16(
PyBytes_AS_STRING(items), Py_SIZE(items),
"strict", &byteorder);
if (converted_items == NULL)
return NULL;
break;
}
case UTF32_LE:
case UTF32_BE: {
int byteorder = (mformat_code == UTF32_LE) ? -1 : 1;
converted_items = PyUnicode_DecodeUTF32(
PyBytes_AS_STRING(items), Py_SIZE(items),
"strict", &byteorder);
if (converted_items == NULL)
return NULL;
break;
}
case UNSIGNED_INT8:
case SIGNED_INT8:
case UNSIGNED_INT16_LE:
case UNSIGNED_INT16_BE:
case SIGNED_INT16_LE:
case SIGNED_INT16_BE:
case UNSIGNED_INT32_LE:
case UNSIGNED_INT32_BE:
case SIGNED_INT32_LE:
case SIGNED_INT32_BE:
case UNSIGNED_INT64_LE:
case UNSIGNED_INT64_BE:
case SIGNED_INT64_LE:
case SIGNED_INT64_BE: {
int i;
const struct mformatdescr mf_descr =
mformat_descriptors[mformat_code];
Py_ssize_t itemcount = Py_SIZE(items) / mf_descr.size;
const unsigned char *memstr =
(unsigned char *)PyBytes_AS_STRING(items);
struct arraydescr *descr;
/* If possible, try to pack array's items using a data type
* that fits better. This may result in an array with narrower
* or wider elements.
*
* For example, if a 32-bit machine pickles a L-code array of
* unsigned longs, then the array will be unpickled by 64-bit
* machine as an I-code array of unsigned ints.
*
* XXX: Is it possible to write a unit test for this?
*/
for (descr = descriptors; descr->typecode != '\0'; descr++) {
if (descr->is_integer_type &&
descr->itemsize == mf_descr.size &&
descr->is_signed == mf_descr.is_signed)
typecode = descr->typecode;
}
converted_items = PyList_New(itemcount);
if (converted_items == NULL)
return NULL;
for (i = 0; i < itemcount; i++) {
PyObject *pylong;
pylong = _PyLong_FromByteArray(
&memstr[i * mf_descr.size],
mf_descr.size,
!mf_descr.is_big_endian,
mf_descr.is_signed);
if (pylong == NULL) {
Py_DECREF(converted_items);
return NULL;
}
PyList_SET_ITEM(converted_items, i, pylong);
}
break;
}
case UNKNOWN_FORMAT:
/* Impossible, but needed to shut up GCC about the unhandled
* enumeration value.
*/
return NULL;
}
result = make_array(arraytype, typecode, converted_items);
Py_DECREF(converted_items);
return result;
}
static PyObject *
array_reduce_ex(arrayobject *array, PyObject *value)
{
PyObject *dict;
PyObject *result;
PyObject *array_str;
int typecode = array->ob_descr->typecode;
int mformat_code;
static PyObject *array_reconstructor = NULL;
long protocol;
if (array_reconstructor == NULL) {
PyObject *array_module = PyImport_ImportModule("array");
if (array_module == NULL)
return NULL;
array_reconstructor = PyObject_GetAttrString(
array_module,
"_array_reconstructor");
Py_DECREF(array_module);
if (array_reconstructor == NULL)
return NULL;
}
if (!PyLong_Check(value)) {
PyErr_SetString(PyExc_TypeError,
"__reduce_ex__ argument should an integer");
return NULL;
}
protocol = PyLong_AsLong(value);
if (protocol == -1 && PyErr_Occurred())
return NULL;
dict = PyObject_GetAttrString((PyObject *)array, "__dict__");
if (dict == NULL) {
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
return NULL;
PyErr_Clear();
dict = Py_None;
Py_INCREF(dict);
}
mformat_code = typecode_to_mformat_code(typecode);
if (mformat_code == UNKNOWN_FORMAT || protocol < 3) {
/* Convert the array to a list if we got something weird
* (e.g., non-IEEE floats), or we are pickling the array using
* a Python 2.x compatible protocol.
*
* It is necessary to a list representation for Python 2.x
* compatible pickle protocol, since Python 2's str objects
* are unpickled as unicode by Python 3. Thus it is impossible
* to make arrays unpicklable by Python 3 by using their memory
* representation, unless we resort to ugly hacks such as
* coercing unicode objects to bytes in array_reconstructor.
*/
PyObject *list;
list = array_tolist(array, NULL);
if (list == NULL) {
Py_DECREF(dict);
return NULL;
}
result = Py_BuildValue(
"O(CO)O", Py_TYPE(array), typecode, list, dict);
Py_DECREF(list);
Py_DECREF(dict);
return result;
}
array_str = array_tostring(array, NULL);
if (array_str == NULL) {
Py_DECREF(dict);
return NULL;
}
result = Py_BuildValue(
"O(OCiN)O", array_reconstructor, Py_TYPE(array), typecode,
mformat_code, array_str, dict);
Py_DECREF(dict);
return result;
}
PyDoc_STRVAR(reduce_doc, "Return state information for pickling.");
static PyObject *
array_get_typecode(arrayobject *a, void *closure)
{
@ -1525,8 +1989,8 @@ static PyMethodDef array_methods[] = {
insert_doc},
{"pop", (PyCFunction)array_pop, METH_VARARGS,
pop_doc},
{"__reduce__", (PyCFunction)array_reduce, METH_NOARGS,
array_doc},
{"__reduce_ex__", (PyCFunction)array_reduce_ex, METH_O,
reduce_doc},
{"remove", (PyCFunction)array_remove, METH_O,
remove_doc},
{"reverse", (PyCFunction)array_reverse, METH_NOARGS,
@ -2167,6 +2631,8 @@ static PyTypeObject PyArrayIter_Type = {
/* No functions in array module. */
static PyMethodDef a_methods[] = {
{"_array_reconstructor", array_reconstructor, METH_VARARGS,
PyDoc_STR("Internal. Used for pickling support.")},
{NULL, NULL, 0, NULL} /* Sentinel */
};