| 370 | } |
| 371 | |
| 372 | auto RamFs::RamFsFileOps::Seek(File* file, int64_t offset, SeekWhence whence) |
| 373 | -> Expected<uint64_t> { |
| 374 | if (file == nullptr) { |
| 375 | return std::unexpected(Error(ErrorCode::kInvalidArgument)); |
| 376 | } |
| 377 | |
| 378 | uint64_t new_offset = 0; |
| 379 | |
| 380 | switch (whence) { |
| 381 | case SeekWhence::kSet: |
| 382 | if (offset < 0) { |
| 383 | return std::unexpected(Error(ErrorCode::kInvalidArgument)); |
| 384 | } |
| 385 | new_offset = static_cast<uint64_t>(offset); |
| 386 | break; |
| 387 | |
| 388 | case SeekWhence::kCur: |
| 389 | if (offset < 0 && static_cast<uint64_t>(-offset) > file->offset) { |
| 390 | return std::unexpected(Error(ErrorCode::kInvalidArgument)); |
| 391 | } |
| 392 | new_offset = |
| 393 | static_cast<uint64_t>(static_cast<int64_t>(file->offset) + offset); |
| 394 | break; |
| 395 | |
| 396 | case SeekWhence::kEnd: |
| 397 | if (file->inode == nullptr) { |
| 398 | return std::unexpected(Error(ErrorCode::kFsCorrupted)); |
| 399 | } |
| 400 | if (offset < 0 && static_cast<uint64_t>(-offset) > file->inode->size) { |
| 401 | return std::unexpected(Error(ErrorCode::kInvalidArgument)); |
| 402 | } |
| 403 | new_offset = static_cast<uint64_t>( |
| 404 | static_cast<int64_t>(file->inode->size) + offset); |
| 405 | break; |
| 406 | |
| 407 | default: |
| 408 | return std::unexpected(Error(ErrorCode::kInvalidArgument)); |
| 409 | } |
| 410 | |
| 411 | file->offset = new_offset; |
| 412 | return new_offset; |
| 413 | } |
| 414 | |
| 415 | auto RamFs::RamFsFileOps::Close(File* file) -> Expected<void> { |
| 416 | if (file == nullptr) { |