Fix writing of large sized ISO images

Correctly handle offset calculation. Fixes #793
FedoraQt · Jan 3, 2025 · e59dcdb · e59dcdb
1 parent 4df9846
commit e59dcdb
Showing 1 changed file with 3 additions and 4 deletions.
diff --git a/src/helper/win/writejob.cpp b/src/helper/win/writejob.cpp
@@ -475,10 +475,9 @@ bool WriteJob::writePlain(HANDLE driveHandle)
             return false;
         }
 
-        if (osWrite.Offset + blockSize < osWrite.Offset) {
-            osWrite.OffsetHigh++;
-        }
-        osWrite.Offset += blockSize;
+        uint64_t newOffset = (static_cast<uint64_t>(osWrite.OffsetHigh) << 32) + osWrite.Offset + readBytes;
+        osWrite.Offset = static_cast<DWORD>(newOffset & 0xFFFFFFFF);
+        osWrite.OffsetHigh = static_cast<DWORD>(newOffset >> 32);
 
         totalBytes += readBytes;
         m_out << totalBytes << "\n";