| 41 | } |
| 42 | |
| 43 | bool FMjShmRegion::Open(const FString& Path, uint32 InBufferStride, uint32 InNBuffers) |
| 44 | { |
| 45 | if (MappedAddr != nullptr) |
| 46 | { |
| 47 | UE_LOG(LogURLabNet, Warning, TEXT("FMjShmRegion::Open: already open at %s"), *FilePath); |
| 48 | return false; |
| 49 | } |
| 50 | if (InBufferStride < sizeof(uint32)) |
| 51 | { |
| 52 | UE_LOG(LogURLabNet, Error, TEXT("FMjShmRegion::Open: stride must be >= 4")); |
| 53 | return false; |
| 54 | } |
| 55 | |
| 56 | // Make sure parent directory exists. |
| 57 | const FString ParentDir = FPaths::GetPath(Path); |
| 58 | if (!ParentDir.IsEmpty()) |
| 59 | { |
| 60 | IFileManager::Get().MakeDirectory(*ParentDir, /*Tree=*/true); |
| 61 | } |
| 62 | |
| 63 | const uint64 TotalSize = sizeof(FMjShmHeader) + uint64(InBufferStride) * uint64(InNBuffers); |
| 64 | |
| 65 | #if PLATFORM_WINDOWS |
| 66 | // Create / truncate the backing file. |
| 67 | HANDLE hFile = ::CreateFileW(*Path, |
| 68 | GENERIC_READ | GENERIC_WRITE, |
| 69 | FILE_SHARE_READ | FILE_SHARE_WRITE, |
| 70 | nullptr, |
| 71 | CREATE_ALWAYS, |
| 72 | FILE_ATTRIBUTE_NORMAL, |
| 73 | nullptr); |
| 74 | if (hFile == INVALID_HANDLE_VALUE) |
| 75 | { |
| 76 | UE_LOG(LogURLabNet, Error, TEXT("FMjShmRegion::Open: CreateFileW failed for %s (err=%lu)"), |
| 77 | *Path, ::GetLastError()); |
| 78 | return false; |
| 79 | } |
| 80 | |
| 81 | // Set file size to TotalSize via SetFilePointerEx + SetEndOfFile. |
| 82 | LARGE_INTEGER NewPos; |
| 83 | NewPos.QuadPart = static_cast<LONGLONG>(TotalSize); |
| 84 | if (!::SetFilePointerEx(hFile, NewPos, nullptr, FILE_BEGIN) || !::SetEndOfFile(hFile)) |
| 85 | { |
| 86 | UE_LOG(LogURLabNet, Error, TEXT("FMjShmRegion::Open: SetEndOfFile failed (err=%lu)"), |
| 87 | ::GetLastError()); |
| 88 | ::CloseHandle(hFile); |
| 89 | return false; |
| 90 | } |
| 91 | |
| 92 | HANDLE hMap = ::CreateFileMappingW(hFile, nullptr, PAGE_READWRITE, |
| 93 | static_cast<DWORD>(TotalSize >> 32), static_cast<DWORD>(TotalSize & 0xFFFFFFFFu), |
| 94 | nullptr); |
| 95 | if (!hMap) |
| 96 | { |
| 97 | UE_LOG(LogURLabNet, Error, TEXT("FMjShmRegion::Open: CreateFileMappingW failed (err=%lu)"), |
| 98 | ::GetLastError()); |
| 99 | ::CloseHandle(hFile); |
| 100 | return false; |
no test coverage detected