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

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

@@ -69,11 +69,16 @@ void SweepstoreFileHandle::readSeek(std::streampos pos, std::ios::seekdir dir) {
     }
 #else
     #ifdef _WIN32
-        // On Windows, flush output and sync to invalidate input buffer
+        // On Windows, flush and sync to disk, then invalidate buffers
         stream->flush();
-        stream->seekp(pos, dir);  // Sync put pointer
+        stream->sync();
+        stream->clear();
+        // Sync both pointers to same position
+        stream->seekp(pos, dir);
+        stream->seekg(pos, dir);
+    #else
+        stream->seekg(pos, dir);
     #endif
-    stream->seekg(pos, dir);
 #endif
 }
 
@@ -84,7 +89,8 @@ void SweepstoreFileHandle::writeSeek(std::streampos pos, std::ios::seekdir dir)
     readSeek(pos, dir);
 #else
     #ifdef _WIN32
-        stream->flush();  // Flush any pending writes
+        stream->flush();
+        stream->sync();
     #endif
     stream->seekp(pos, dir);
 #endif
@@ -96,6 +102,12 @@ void SweepstoreFileHandle::readBytes(char* buffer, std::streamsize size) {
     unrealHandle->Read(reinterpret_cast<uint8*>(buffer), size);
 #else
     stream->read(buffer, size);
+    #ifdef _WIN32
+        // Check for read errors on Windows
+        if (stream->fail() && !stream->eof()) {
+            stream->clear();
+        }
+    #endif
 #endif
 }
 
@@ -106,5 +118,11 @@ void SweepstoreFileHandle::writeBytes(const char* buffer, std::streamsize size)
     unrealHandle->Flush();  // Unreal requires explicit flush
 #else
     stream->write(buffer, size);
+    #ifdef _WIN32
+        // Check for write errors on Windows
+        if (stream->fail()) {
+            stream->clear();
+        }
+    #endif
 #endif
 }