diff --git a/Common/DocxFormat/Source/SystemUtility/FileSystem/DirectoryPosix.cpp b/Common/DocxFormat/Source/SystemUtility/FileSystem/DirectoryPosix.cpp
index d53ad9c121..2732ec1c8f 100644
--- a/Common/DocxFormat/Source/SystemUtility/FileSystem/DirectoryPosix.cpp
+++ b/Common/DocxFormat/Source/SystemUtility/FileSystem/DirectoryPosix.cpp
@@ -119,7 +119,24 @@ namespace FileSystem {
         std::string sRes = pcRes;
         return stringUtf8ToWString (sRes);
     }
+    std::wstring Directory::CreateTempFileWithUniqueName (const std::wstring & strFolderPathRoot, std::wstring Prefix)
+    {
+        char pcRes[MAX_PATH];
+        if (NULL == pcRes) return _T("");
 
+        Prefix = strFolderPathRoot + FILE_SEPARATOR_STR + Prefix + _T("_XXXXXX");
+
+        std::wstring w_str  = Prefix.c_str();
+        std::string a_str   = stringWstingToUtf8String(w_str);
+
+        memcpy(pcRes, a_str.c_str(), a_str.length());
+        pcRes[a_str.length()] = '\0';
+
+        int res = mkstemp( pcRes);
+
+        std::string sRes = pcRes;
+        return stringUtf8ToWString (sRes);
+    }
     bool Directory::CreateDirectory (String strFolderPathRoot, String strFolderName)
     {
         String strFolder = strFolderPathRoot;
diff --git a/XlsxSerializerCom/Reader/ChartFromToBinary.cpp b/XlsxSerializerCom/Reader/ChartFromToBinary.cpp
index 7f76a6f47e..5cc2668096 100644
--- a/XlsxSerializerCom/Reader/ChartFromToBinary.cpp
+++ b/XlsxSerializerCom/Reader/ChartFromToBinary.cpp
@@ -5586,7 +5586,7 @@ namespace BinXlsxRW{
 		CT_RotX* poVal = static_cast<CT_RotX*>(poResult);
 		if(c_oserct_rotxVAL == type)
 		{
-			char* pNewElem = new char;
+            signed char* pNewElem = new signed char;
 			*pNewElem = m_oBufferedStream.GetUChar();
 			poVal->m_val = pNewElem;
 		}