diff --git a/DesktopEditor/common/StringExt.cpp b/DesktopEditor/common/StringExt.cpp
index d2828f6a11..add5110bd5 100644
--- a/DesktopEditor/common/StringExt.cpp
+++ b/DesktopEditor/common/StringExt.cpp
@@ -226,6 +226,63 @@ namespace NSStringExt
 
         return sRet;
     }
+    std::string CConverter::GetUtf8FromUTF32(const unsigned int* pUnicodes, long lCount)
+    {
+        unsigned char* pData = new unsigned char[6 * lCount + 3 + 1];
+        unsigned char* pCodesCur = pData;
+        long lOutputCount = 0;
+
+        for (int i = 0; i < lCount; i++)
+        {
+            unsigned int code = *pUnicodes++;
+
+            if (code < 0x80)
+            {
+                *pCodesCur++ = (unsigned char)code;
+            }
+            else if (code < 0x0800)
+            {
+                *pCodesCur++ = 0xC0 | (code >> 6);
+                *pCodesCur++ = 0x80 | (code & 0x3F);
+            }
+            else if (code < 0x10000)
+            {
+                *pCodesCur++ = 0xE0 | (code >> 12);
+                *pCodesCur++ = 0x80 | (code >> 6 & 0x3F);
+                *pCodesCur++ = 0x80 | (code & 0x3F);
+            }
+            else if (code < 0x1FFFFF)
+            {
+                *pCodesCur++ = 0xF0 | (code >> 18);
+                *pCodesCur++ = 0x80 | (code >> 12 & 0x3F);
+                *pCodesCur++ = 0x80 | (code >> 6 & 0x3F);
+                *pCodesCur++ = 0x80 | (code & 0x3F);
+            }
+            else if (code < 0x3FFFFFF)
+            {
+                *pCodesCur++ = 0xF8 | (code >> 24);
+                *pCodesCur++ = 0x80 | (code >> 18 & 0x3F);
+                *pCodesCur++ = 0x80 | (code >> 12 & 0x3F);
+                *pCodesCur++ = 0x80 | (code >> 6 & 0x3F);
+                *pCodesCur++ = 0x80 | (code & 0x3F);
+            }
+            else if (code < 0x7FFFFFFF)
+            {
+                *pCodesCur++ = 0xFC | (code >> 30);
+                *pCodesCur++ = 0x80 | (code >> 24 & 0x3F);
+                *pCodesCur++ = 0x80 | (code >> 18 & 0x3F);
+                *pCodesCur++ = 0x80 | (code >> 12 & 0x3F);
+                *pCodesCur++ = 0x80 | (code >> 6 & 0x3F);
+                *pCodesCur++ = 0x80 | (code & 0x3F);
+            }
+        }
+
+        lOutputCount = (long)(pCodesCur - pData);
+        *pCodesCur++ = 0;
+        std::string s((char*)pData, lOutputCount);
+        delete [] pData;
+        return s;
+    }
     unsigned int* CConverter::GetUtf32FromUnicode(const std::wstring& wsUnicodeText, unsigned int& unLen)
     {
         if (wsUnicodeText.size() <= 0)
diff --git a/DesktopEditor/common/StringExt.h b/DesktopEditor/common/StringExt.h
index 986b46f23a..0304354afe 100644
--- a/DesktopEditor/common/StringExt.h
+++ b/DesktopEditor/common/StringExt.h
@@ -131,6 +131,7 @@ namespace NSStringExt
         static std::wstring GetUnicodeFromSingleByteString(const unsigned char* pData, long lCount, ESingleByteEncoding eType = SINGLE_BYTE_ENCODING_DEFAULT);
         static std::wstring GetUnicodeFromUTF16(const unsigned short* pData, long lCount);
         static std::wstring GetUnicodeFromUTF32(const unsigned int* pData, long lCount);
+        static std::string GetUtf8FromUTF32(const unsigned int* pData, long lCount);
         static unsigned int* GetUtf32FromUnicode(const std::wstring& wsUnicodeText, unsigned int& unLen);
         static unsigned short* GetUtf16FromUnicode(const std::wstring& wsUnicodeText, unsigned int& unLen, const bool& isLE = true);
     };
diff --git a/PdfReader/PdfReader.cpp b/PdfReader/PdfReader.cpp
index 306effb5e9..f7d36d8628 100644
--- a/PdfReader/PdfReader.cpp
+++ b/PdfReader/PdfReader.cpp
@@ -55,6 +55,7 @@
 #include "lib/xpdf/Link.h"
 #include "lib/xpdf/TextOutputDev.h"
 #include "lib/goo/GList.h"
+#include "../DesktopEditor/common/StringExt.h"
 #endif
 
 namespace PdfReader
@@ -509,69 +510,12 @@ return 0;
 //		return wsXml;
         return L"";
 	}
-#ifdef BUILDING_WASM_MODULE
-    std::string GetUtf8StringFromUnicode_4bytes(Unicode* pUnicodes, LONG lCount)
-    {
-        BYTE* pData = new BYTE[6 * lCount + 3 + 1];
-        BYTE* pCodesCur = pData;
-        LONG lOutputCount = 0;
-
-        for (int i = 0; i < lCount; i++)
-        {
-            unsigned int code = *pUnicodes++;
-
-            if (code < 0x80)
-            {
-                *pCodesCur++ = (BYTE)code;
-            }
-            else if (code < 0x0800)
-            {
-                *pCodesCur++ = 0xC0 | (code >> 6);
-                *pCodesCur++ = 0x80 | (code & 0x3F);
-            }
-            else if (code < 0x10000)
-            {
-                *pCodesCur++ = 0xE0 | (code >> 12);
-                *pCodesCur++ = 0x80 | (code >> 6 & 0x3F);
-                *pCodesCur++ = 0x80 | (code & 0x3F);
-            }
-            else if (code < 0x1FFFFF)
-            {
-                *pCodesCur++ = 0xF0 | (code >> 18);
-                *pCodesCur++ = 0x80 | (code >> 12 & 0x3F);
-                *pCodesCur++ = 0x80 | (code >> 6 & 0x3F);
-                *pCodesCur++ = 0x80 | (code & 0x3F);
-            }
-            else if (code < 0x3FFFFFF)
-            {
-                *pCodesCur++ = 0xF8 | (code >> 24);
-                *pCodesCur++ = 0x80 | (code >> 18 & 0x3F);
-                *pCodesCur++ = 0x80 | (code >> 12 & 0x3F);
-                *pCodesCur++ = 0x80 | (code >> 6 & 0x3F);
-                *pCodesCur++ = 0x80 | (code & 0x3F);
-            }
-            else if (code < 0x7FFFFFFF)
-            {
-                *pCodesCur++ = 0xFC | (code >> 30);
-                *pCodesCur++ = 0x80 | (code >> 24 & 0x3F);
-                *pCodesCur++ = 0x80 | (code >> 18 & 0x3F);
-                *pCodesCur++ = 0x80 | (code >> 12 & 0x3F);
-                *pCodesCur++ = 0x80 | (code >> 6 & 0x3F);
-                *pCodesCur++ = 0x80 | (code & 0x3F);
-            }
-        }
-
-        lOutputCount = (LONG)(pCodesCur - pData);
-        *pCodesCur++ = 0;
-        std::string s((char*)pData, lOutputCount);
-        RELEASEARRAYOBJECTS(pData);
-        return s;
-    }
+#ifdef BUILDING_WASM_MODULE    
     void getBookmars(PDFDoc* pdfDoc, OutlineItem* pOutlineItem, NSWasm::CData& out, int level)
     {
         int nLengthTitle = pOutlineItem->getTitleLength();
         Unicode* pTitle = pOutlineItem->getTitle();
-        std::string sTitle = GetUtf8StringFromUnicode_4bytes(pTitle, nLengthTitle);
+        std::string sTitle = NSStringExt::CConverter::GetUtf8FromUTF32(pTitle, nLengthTitle);
 
         LinkAction* pLinkAction = pOutlineItem->getAction();
         if (!pLinkAction)