fix oblivion and skyrim

apps/openmw/mwworld/cellstore.cpp

@@ -766,21 +766,22 @@ namespace MWWorld
     {
         auto stream = Files::openBinaryInputFileStream(cell.mReaderContext.filename);
         const ESM::Format format = ESM::readFormat(*stream);
-        assert(format == ESM::Tes4);
+        assert(format == ESM::Format::Tes4);
         stream->seekg(0);
 
         ESM4::Reader readerESM4(
             std::move(stream), cell.mReaderContext.filename, MWBase::Environment::get().getResourceSystem()->getVFS());
 
         readerESM4.setEncoder(readers.getStatelessEncoder());
-        bool contextValid = cell.mReaderContext.filePos != -1;
+        bool contextValid = cell.mReaderContext.filePos != std::numeric_limits<std::size_t>::max();
         if (contextValid)
             readerESM4.restoreContext(cell.mReaderContext);
 
         while ((ESM::RefId::formIdRefId(readerESM4.getContext().currCell) == cell.mId || !contextValid)
             && readerESM4.hasMoreRecs())
         {
-            readerESM4.exitGroupCheck();
+            if (!contextValid)
+                readerESM4.exitGroupCheck();
             if (!ESM4::ReaderUtils::readItem(
                     readerESM4,
                     [&](ESM4::Reader& reader) {
@@ -788,6 +789,7 @@ namespace MWWorld
                         ESM::RecNameInts esm4RecName = static_cast<ESM::RecNameInts>(ESM::esm4Recname(recordType));
                         if (esm4RecName == ESM::RecNameInts::REC_REFR4 && contextValid)
                         {
+                            reader.getRecordData();
                             ESM4::Reference ref;
                             ref.load(reader);
                             invocable(ref);
@@ -795,6 +797,7 @@ namespace MWWorld
                         }
                         else if (esm4RecName == ESM::RecNameInts::REC_CELL4)
                         {
+                            reader.getRecordData();
                             ESM4::Cell cellToLoad;
                             cellToLoad.load(reader); // This is necessary to exit or to find the correct cell
                             if (cellToLoad.mId == cell.mId)

components/esm4/reader.cpp

@@ -134,7 +134,7 @@ namespace ESM4
     ReaderContext Reader::getContext()
     {
         mCtx.filePos = mStream->tellg();
-        if (mCtx.filePos == -1)
+        if (mCtx.filePos == std::numeric_limits<std::size_t>::max())
             return mCtx;
         mCtx.filePos -= mCtx.recHeaderSize; // update file position
         return mCtx;