2 files changed, 6 insertions, 0 deletions
diff --git a/core/fxcrt/cfx_bytestring.cpp b/core/fxcrt/cfx_bytestring.cpp
index f0dc370cc9..b83c59ffeb 100644
--- a/core/fxcrt/cfx_bytestring.cpp
+++ b/core/fxcrt/cfx_bytestring.cpp
@@ -189,6 +189,10 @@ CFX_ByteString::CFX_ByteString(
   }
 }
 
+CFX_ByteString::CFX_ByteString(std::ostringstream& outStream)
+    : CFX_ByteString(outStream.str().c_str(),
+                     static_cast<int>(outStream.tellp())) {}
+
 CFX_ByteString::~CFX_ByteString() {}
 
 const CFX_ByteString& CFX_ByteString::operator=(const char* pStr) {
diff --git a/core/fxcrt/cfx_bytestring.h b/core/fxcrt/cfx_bytestring.h
index c4d48954ba..23e02491c5 100644
--- a/core/fxcrt/cfx_bytestring.h
+++ b/core/fxcrt/cfx_bytestring.h
@@ -8,6 +8,7 @@
 #define CORE_FXCRT_CFX_BYTESTRING_H_
 
 #include <functional>
+#include <sstream>
 #include <utility>
 
 #include "core/fxcrt/cfx_retain_ptr.h"
@@ -45,6 +46,7 @@ class CFX_ByteString {
   explicit CFX_ByteString(const CFX_ByteStringC& bstrc);
   CFX_ByteString(const CFX_ByteStringC& bstrc1, const CFX_ByteStringC& bstrc2);
   CFX_ByteString(const std::initializer_list<CFX_ByteStringC>& list);
+  explicit CFX_ByteString(std::ostringstream& outStream);
 
   ~CFX_ByteString();