5 files changed, 10 insertions, 10 deletions
diff --git a/core/fxcrt/cfx_chariter.cpp b/core/fxcrt/cfx_chariter.cpp
index d26dd2df8f..db94fb09f4 100644
--- a/core/fxcrt/cfx_chariter.cpp
+++ b/core/fxcrt/cfx_chariter.cpp
@@ -28,7 +28,7 @@ bool CFX_CharIter::Next(bool bPrev) {
   return true;
 }
 
-wchar_t CFX_CharIter::GetChar() {
+wchar_t CFX_CharIter::GetChar() const {
   return m_wsText[m_nIndex];
 }
 
@@ -46,7 +46,7 @@ bool CFX_CharIter::IsEOF(bool bTail) const {
   return bTail ? (m_nIndex + 1 == m_wsText.GetLength()) : (m_nIndex == 0);
 }
 
-std::unique_ptr<IFX_CharIter> CFX_CharIter::Clone() {
+std::unique_ptr<IFX_CharIter> CFX_CharIter::Clone() const {
   auto pIter = pdfium::MakeUnique<CFX_CharIter>(m_wsText);
   pIter->m_nIndex = m_nIndex;
   return pIter;
diff --git a/core/fxcrt/cfx_chariter.h b/core/fxcrt/cfx_chariter.h
index 50fdde879f..523ea5a75b 100644
--- a/core/fxcrt/cfx_chariter.h
+++ b/core/fxcrt/cfx_chariter.h
@@ -19,11 +19,11 @@ class CFX_CharIter : public IFX_CharIter {
   ~CFX_CharIter() override;
 
   bool Next(bool bPrev = false) override;
-  wchar_t GetChar() override;
+  wchar_t GetChar() const override;
   void SetAt(int32_t nIndex) override;
   int32_t GetAt() const override;
   bool IsEOF(bool bTail = true) const override;
-  std::unique_ptr<IFX_CharIter> Clone() override;
+  std::unique_ptr<IFX_CharIter> Clone() const override;
 
  private:
   const CFX_WideString& m_wsText;
diff --git a/core/fxcrt/ifx_chariter.h b/core/fxcrt/ifx_chariter.h
index b8e240953a..e82cbbd040 100644
--- a/core/fxcrt/ifx_chariter.h
+++ b/core/fxcrt/ifx_chariter.h
@@ -16,11 +16,11 @@ class IFX_CharIter {
   virtual ~IFX_CharIter() {}
 
   virtual bool Next(bool bPrev = false) = 0;
-  virtual wchar_t GetChar() = 0;
+  virtual wchar_t GetChar() const = 0;
   virtual void SetAt(int32_t nIndex) = 0;
   virtual int32_t GetAt() const = 0;
   virtual bool IsEOF(bool bTail = true) const = 0;
-  virtual std::unique_ptr<IFX_CharIter> Clone() = 0;
+  virtual std::unique_ptr<IFX_CharIter> Clone() const = 0;
 };
 
 #endif  // CORE_FXCRT_IFX_CHARITER_H_
diff --git a/xfa/fde/cfde_txtedtbuf.cpp b/xfa/fde/cfde_txtedtbuf.cpp
index 101385b143..d0f41d8b9d 100644
--- a/xfa/fde/cfde_txtedtbuf.cpp
+++ b/xfa/fde/cfde_txtedtbuf.cpp
@@ -330,7 +330,7 @@ int32_t CFDE_TxtEdtBuf::Iterator::GetAt() const {
   return m_nIndex;
 }
 
-wchar_t CFDE_TxtEdtBuf::Iterator::GetChar() {
+wchar_t CFDE_TxtEdtBuf::Iterator::GetChar() const {
   ASSERT(m_nIndex >= 0 && m_nIndex < m_pBuf->m_nTotal);
   if (m_Alias == 0 || m_nIndex == (m_pBuf->m_nTotal - 1)) {
     wchar_t* buf = m_pBuf->m_chunks[m_nCurChunk]->wChars.get();
@@ -343,7 +343,7 @@ bool CFDE_TxtEdtBuf::Iterator::IsEOF(bool bTail) const {
   return bTail ? m_nIndex == (m_pBuf->GetTextLength() - 2) : m_nIndex == 0;
 }
 
-std::unique_ptr<IFX_CharIter> CFDE_TxtEdtBuf::Iterator::Clone() {
+std::unique_ptr<IFX_CharIter> CFDE_TxtEdtBuf::Iterator::Clone() const {
   auto pIter = pdfium::MakeUnique<CFDE_TxtEdtBuf::Iterator>(m_pBuf, 0);
   pIter->m_nCurChunk = m_nCurChunk;
   pIter->m_nCurIndex = m_nCurIndex;
diff --git a/xfa/fde/cfde_txtedtbuf.h b/xfa/fde/cfde_txtedtbuf.h
index 3fbcd4b9d0..b500a9871e 100644
--- a/xfa/fde/cfde_txtedtbuf.h
+++ b/xfa/fde/cfde_txtedtbuf.h
@@ -23,13 +23,13 @@ class CFDE_TxtEdtBuf {
     ~Iterator() override;
 
     bool Next(bool bPrev = false) override;
-    wchar_t GetChar() override;
+    wchar_t GetChar() const override;
 
     void SetAt(int32_t nIndex) override;
     int32_t GetAt() const override;
 
     bool IsEOF(bool bTail = true) const override;
-    std::unique_ptr<IFX_CharIter> Clone() override;
+    std::unique_ptr<IFX_CharIter> Clone() const override;
 
    private:
     CFDE_TxtEdtBuf* m_pBuf;