Enhance Windows file handling with improved sync and error checking in read/write operations

cpp/src/Private/sweepstore/utils/file_handle.cpp

@@ -55,6 +55,7 @@ void SweepstoreFileHandle::close() {
 #endif
 }
 
+#if defined(_WIN32) || defined(WITH_UNREAL)
 // readSeek
 void SweepstoreFileHandle::readSeek(std::streampos pos, std::ios::seekdir dir) {
 #ifdef WITH_UNREAL
@@ -68,17 +69,14 @@ void SweepstoreFileHandle::readSeek(std::streampos pos, std::ios::seekdir dir) {
         unrealHandle->SeekFromEnd(unrealPos);
     }
 #else
-    #ifdef _WIN32
-        // On Windows, flush and sync to disk, then invalidate buffers
-        stream->flush();
-        stream->sync();
-        stream->clear();
-        // Sync both pointers to same position
-        stream->seekp(pos, dir);
-        stream->seekg(pos, dir);
-    #else
-        stream->seekg(pos, dir);
-    #endif
+    // Windows
+    // On Windows, flush and sync to disk, then invalidate buffers
+    stream->flush();
+    stream->sync();
+    stream->clear();
+    // Sync both pointers to same position
+    stream->seekp(pos, dir);
+    stream->seekg(pos, dir);
 #endif
 }
 
@@ -88,10 +86,9 @@ void SweepstoreFileHandle::writeSeek(std::streampos pos, std::ios::seekdir dir)
     // Same as readSeek for Unreal
     readSeek(pos, dir);
 #else
-    #ifdef _WIN32
-        stream->flush();
-        stream->sync();
-    #endif
+    // Windows
+    stream->flush();
+    stream->sync();
     stream->seekp(pos, dir);
 #endif
 }
@@ -101,13 +98,12 @@ void SweepstoreFileHandle::readBytes(char* buffer, std::streamsize size) {
 #ifdef WITH_UNREAL
     unrealHandle->Read(reinterpret_cast<uint8*>(buffer), size);
 #else
+    // Windows
     stream->read(buffer, size);
-    #ifdef _WIN32
-        // Check for read errors on Windows
-        if (stream->fail() && !stream->eof()) {
-            stream->clear();
-        }
-    #endif
+    // Check for read errors on Windows
+    if (stream->fail() && !stream->eof()) {
+        stream->clear();
+    }
 #endif
 }
 
@@ -117,12 +113,12 @@ void SweepstoreFileHandle::writeBytes(const char* buffer, std::streamsize size)
     unrealHandle->Write(reinterpret_cast<const uint8*>(buffer), size);
     unrealHandle->Flush();  // Unreal requires explicit flush
 #else
+    // Windows
     stream->write(buffer, size);
-    #ifdef _WIN32
-        // Check for write errors on Windows
-        if (stream->fail()) {
-            stream->clear();
-        }
-    #endif
+    // Check for write errors on Windows
+    if (stream->fail()) {
+        stream->clear();
+    }
 #endif
-}
+}
+#endif // _WIN32 || WITH_UNREAL