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Increase batch size of Next() calls in inner loop

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Also fail with an error for any return value of Next() other than S_OK
and S_FALSE.
This commit is contained in:
Kovid Goyal 2025-01-24 09:42:13 +05:30
parent 614b58c3b6
commit b293089ba3
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GPG Key ID: 06BC317B515ACE7C
1 changed files with 17 additions and 10 deletions
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25
src/calibre/devices/mtp/windows/content_enumeration.cpp
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@ -332,7 +332,7 @@ find_objects_in(CComPtr<IPortableDeviceContent> &content, CComPtr<IPortableDevic
Py_END_ALLOW_THREADS;
if (FAILED(hr)) {
fwprintf(stderr, L"Failed to EnumObjects() for object id: %s retrying with a sleep.\n", parent_id); fflush(stderr);
fwprintf(stderr, L"Failed to EnumObjects() for object id: %s with hr: %x retrying with a sleep.\n", parent_id, hr); fflush(stderr);
Py_BEGIN_ALLOW_THREADS;
Sleep(500);
hr = content->EnumObjects(0, parent_id, NULL, &children);
@ -345,23 +345,30 @@ find_objects_in(CComPtr<IPortableDeviceContent> &content, CComPtr<IPortableDevic
}
}
hr = S_OK;
while (hr == S_OK) {
DWORD fetched;
wchar_t* child_ids[64];
prop_variant pv(VT_LPWSTR);
generic_raii_array<wchar_t*, co_task_mem_free, 16> child_ids;
DWORD fetched;
while (true) {
Py_BEGIN_ALLOW_THREADS;
hr = children->Next((ULONG)child_ids.size(), child_ids.ptr(), &fetched);
hr = children->Next(64u, child_ids, &fetched);
Py_END_ALLOW_THREADS;
if (SUCCEEDED(hr)) {
if (SUCCEEDED(hr) && fetched) {
for (DWORD i = 0; i < fetched; i++) {
pv.pwszVal = child_ids[i];
hr2 = object_ids->Add(&pv);
pv.pwszVal = NULL;
if (FAILED(hr2)) { hresult_set_exc("Failed to add child ids to propvariantcollection", hr2); return false; }
CoTaskMemFree(child_ids[i]); child_ids[i] = NULL;
if (FAILED(hr2)) {
for (DWORD c = i + 1; c < fetched; c++) CoTaskMemFree(child_ids[c]);
hresult_set_exc("Failed to add child id to propvariantcollection", hr2); return false;
}
}
} else {
if (hr == S_FALSE && !fetched) break;
pyobject_raii parent_name(PyUnicode_FromWideChar(parent_id, -1));
set_error_from_hresult(wpd::WPDError, __FILE__, __LINE__, hr, "Failed to EnumObjects()->Next() of folder from device", parent_name.ptr());
return false;
}
}
return true;
} // }}}