1 files changed, 10 insertions, 0 deletions
diff --git a/core/fxcrt/cfx_bytestring.h b/core/fxcrt/cfx_bytestring.h
index 432f28a06d..b976287617 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 <iterator>
 #include <sstream>
 #include <utility>
 
@@ -25,6 +26,7 @@ class CFX_ByteString {
  public:
   using CharType = char;
   using const_iterator = const CharType*;
+  using const_reverse_iterator = std::reverse_iterator<const_iterator>;
 
   CFX_ByteString();
   CFX_ByteString(const CFX_ByteString& other);
@@ -77,6 +79,14 @@ class CFX_ByteString {
     return m_pData ? m_pData->m_String + m_pData->m_nDataLength : nullptr;
   }
 
+  // Note: Any subsequent modification of |this| will invalidate iterators.
+  const_reverse_iterator rbegin() const {
+    return const_reverse_iterator(end());
+  }
+  const_reverse_iterator rend() const {
+    return const_reverse_iterator(begin());
+  }
+
   FX_STRSIZE GetLength() const { return m_pData ? m_pData->m_nDataLength : 0; }
   FX_STRSIZE GetStringLength() const {
     return m_pData ? FXSYS_strlen(m_pData->m_String) : 0;