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gh-129813, PEP 782: Use PyBytesWriter in memoryview by vstinner · Pull Request #138836 · python/cpython · GitHub

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gh-129813, PEP 782: Use PyBytesWriter in memoryview #138836

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Merged
vstinner merged 1 commit into from
Sep 13, 2025
Conversation 0 Commits 1 Checks 45 Files changed
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gh-129813, PEP 782: Use PyBytesWriter in memoryview #138836

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34 changes: 18 additions & 16 deletions Objects/memoryobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2285,7 +2285,6 @@ memoryview_tobytes_impl(PyMemoryViewObject *self, const char *order)
{
Py_buffer *src = VIEW_ADDR(self);
char ord = 'C';
PyObject *bytes;

CHECK_RELEASED(self);

Expand All @@ -2303,16 +2302,18 @@ memoryview_tobytes_impl(PyMemoryViewObject *self, const char *order)
}
}

bytes = PyBytes_FromStringAndSize(NULL, src->len);
if (bytes == NULL)
PyBytesWriter *writer = PyBytesWriter_Create(src->len);
if (writer == NULL) {
return NULL;
}

if (PyBuffer_ToContiguous(PyBytes_AS_STRING(bytes), src, src->len, ord) < 0) {
Py_DECREF(bytes);
if (PyBuffer_ToContiguous(PyBytesWriter_GetData(writer),
src, src->len, ord) < 0) {
PyBytesWriter_Discard(writer);
return NULL;
}

return bytes;
return PyBytesWriter_Finish(writer);
}

/*[clinic input]
Expand Down Expand Up @@ -2344,28 +2345,29 @@ memoryview_hex_impl(PyMemoryViewObject *self, PyObject *sep,
/*[clinic end generated code: output=430ca760f94f3ca7 input=539f6a3a5fb56946]*/
{
Py_buffer *src = VIEW_ADDR(self);
PyObject *bytes;
PyObject *ret;

CHECK_RELEASED(self);

if (MV_C_CONTIGUOUS(self->flags)) {
return _Py_strhex_with_sep(src->buf, src->len, sep, bytes_per_sep);
}

bytes = PyBytes_FromStringAndSize(NULL, src->len);
if (bytes == NULL)
PyBytesWriter *writer = PyBytesWriter_Create(src->len);
if (writer == NULL) {
return NULL;
}

if (PyBuffer_ToContiguous(PyBytes_AS_STRING(bytes), src, src->len, 'C') < 0) {
Py_DECREF(bytes);
if (PyBuffer_ToContiguous(PyBytesWriter_GetData(writer),
src, src->len, 'C') < 0) {
PyBytesWriter_Discard(writer);
return NULL;
}

ret = _Py_strhex_with_sep(
PyBytes_AS_STRING(bytes), PyBytes_GET_SIZE(bytes),
sep, bytes_per_sep);
Py_DECREF(bytes);
PyObject *ret = _Py_strhex_with_sep(
PyBytesWriter_GetData(writer),
PyBytesWriter_GetSize(writer),
sep, bytes_per_sep);
PyBytesWriter_Discard(writer);

return ret;
}
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