bool AutoSystemInfo::IsLowMemoryProcess()
{
ULONG64 commit = ULONG64(-1);
this->GetAvailableCommit(&commit);
return commit <= CONFIG_FLAG(LowMemoryCap);
}
uchar *QFSFileEnginePrivate::map(qint64 offset, qint64 size,
QFile::MemoryMapFlags flags)
{
#ifndef Q_OS_WINPHONE
Q_Q(QFSFileEngine);
Q_UNUSED(flags);
if (openMode == QFile::NotOpen) {
q->setError(QFile::PermissionsError, qt_error_string(ERROR_ACCESS_DENIED));
return 0;
}
if (offset == 0 && size == 0) {
q->setError(QFile::UnspecifiedError, qt_error_string(ERROR_INVALID_PARAMETER));
return 0;
}
// check/setup args to map
DWORD access = 0;
if (flags & QFileDevice::MapPrivateOption) {
#ifdef FILE_MAP_COPY
access = FILE_MAP_COPY;
#else
q->setError(QFile::UnspecifiedError, "MapPrivateOption unsupported");
return 0;
#endif
} else if (openMode & QIODevice::WriteOnly) {
access = FILE_MAP_WRITE;
} else if (openMode & QIODevice::ReadOnly) {
access = FILE_MAP_READ;
}
if (mapHandle == NULL) {
// get handle to the file
HANDLE handle = fileHandle;
#ifndef Q_OS_WINCE
if (handle == INVALID_HANDLE_VALUE && fh)
handle = (HANDLE)::_get_osfhandle(QT_FILENO(fh));
#endif
#ifdef Q_USE_DEPRECATED_MAP_API
nativeClose();
// handle automatically closed by kernel with mapHandle (below).
handle = ::CreateFileForMapping((const wchar_t*)fileEntry.nativeFilePath().utf16(),
GENERIC_READ | (openMode & QIODevice::WriteOnly ? GENERIC_WRITE : 0),
0,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
// Since this is a special case, we check if the return value was NULL and if so
// we change it to INVALID_HANDLE_VALUE to follow the logic inside this function.
if(0 == handle)
handle = INVALID_HANDLE_VALUE;
#endif
if (handle == INVALID_HANDLE_VALUE) {
q->setError(QFile::PermissionsError, qt_error_string(ERROR_ACCESS_DENIED));
return 0;
}
// first create the file mapping handle
DWORD protection = (openMode & QIODevice::WriteOnly) ? PAGE_READWRITE : PAGE_READONLY;
#ifndef Q_OS_WINRT
mapHandle = ::CreateFileMapping(handle, 0, protection, 0, 0, 0);
#else
mapHandle = ::CreateFileMappingFromApp(handle, 0, protection, 0, 0);
#endif
if (mapHandle == NULL) {
q->setError(QFile::PermissionsError, qt_error_string());
#ifdef Q_USE_DEPRECATED_MAP_API
::CloseHandle(handle);
#endif
return 0;
}
}
DWORD offsetHi = offset >> 32;
DWORD offsetLo = offset & Q_UINT64_C(0xffffffff);
SYSTEM_INFO sysinfo;
#ifndef Q_OS_WINRT
::GetSystemInfo(&sysinfo);
#else
::GetNativeSystemInfo(&sysinfo);
#endif
DWORD mask = sysinfo.dwAllocationGranularity - 1;
DWORD extra = offset & mask;
if (extra)
offsetLo &= ~mask;
// attempt to create the map
#ifndef Q_OS_WINRT
LPVOID mapAddress = ::MapViewOfFile(mapHandle, access,
offsetHi, offsetLo, size + extra);
#else
LPVOID mapAddress = ::MapViewOfFileFromApp(mapHandle, access,
(ULONG64(offsetHi) << 32) + offsetLo, size + extra);
#endif
if (mapAddress) {
uchar *address = extra + static_cast<uchar*>(mapAddress);
maps[address] = extra;
return address;
}
switch(GetLastError()) {
case ERROR_ACCESS_DENIED:
q->setError(QFile::PermissionsError, qt_error_string());
break;
case ERROR_INVALID_PARAMETER:
// size are out of bounds
default:
q->setError(QFile::UnspecifiedError, qt_error_string());
}
::CloseHandle(mapHandle);
mapHandle = NULL;
#else // !Q_OS_WINPHONE
Q_UNUSED(offset);
Q_UNUSED(size);
Q_UNUSED(flags);
Q_UNIMPLEMENTED();
#endif // Q_OS_WINPHONE
return 0;
}