Remove a few more char* members from structs/classes.

This is a result of looking for the anti-paterns /char\*\sm_/
and /m_.*=.*\.c_str/ which indicate that a class may be using
the contents of a string without extending the lifetime of
the underlying storage.

Along the way, change to uint8_t in fx_dib; this is unrelated but
avoids grep hits (it is binary, not chars anyways).

Also remove two string operators that make it easy to assign in
a manner that does not extend contents lifetime.

Review URL: https://codereview.chromium.org/1902953002

3 files changed, 10 insertions, 24 deletions

diff --git a/core/fpdfdoc/doc_form.cpp b/core/fpdfdoc/doc_form.cpp
index 5062b45452..d356a5c0e1 100644
--- a/core/fpdfdoc/doc_form.cpp
+++ b/core/fpdfdoc/doc_form.cpp
@@ -48,11 +48,12 @@ CFX_WideString FPDFDOC_FDF_GetFieldValue(const CPDF_Dictionary& pFieldDict,
 
 class CFieldNameExtractor {
  public:
-  explicit CFieldNameExtractor(const CFX_WideString& full_name) {
-    m_pStart = full_name.c_str();
-    m_pEnd = m_pStart + full_name.GetLength();
-    m_pCur = m_pStart;
+  explicit CFieldNameExtractor(const CFX_WideString& full_name)
+      : m_FullName(full_name) {
+    m_pCur = m_FullName.c_str();
+    m_pEnd = m_pCur + m_FullName.GetLength();
   }
+
   void GetNext(const FX_WCHAR*& pSubName, FX_STRSIZE& size) {
     pSubName = m_pCur;
     while (m_pCur < m_pEnd && m_pCur[0] != L'.') {
@@ -65,10 +66,11 @@ class CFieldNameExtractor {
   }
 
  protected:
-  const FX_WCHAR* m_pStart;
-  const FX_WCHAR* m_pEnd;
+  CFX_WideString m_FullName;
   const FX_WCHAR* m_pCur;
+  const FX_WCHAR* m_pEnd;
 };
+
 class CFieldTree {
  public:
   struct _Node {
diff --git a/core/fxcrt/include/fx_string.h b/core/fxcrt/include/fx_string.h
index 2fabee39cf..10a70d9334 100644
--- a/core/fxcrt/include/fx_string.h
+++ b/core/fxcrt/include/fx_string.h
@@ -74,8 +74,6 @@ class CFX_ByteStringC {
     return *this;
   }
 
-  CFX_ByteStringC& operator=(const CFX_ByteString& src);
-
   bool operator==(const char* ptr) const {
     return FXSYS_strlen(ptr) == m_Length &&
            FXSYS_memcmp(ptr, m_Ptr, m_Length) == 0;
@@ -285,12 +283,6 @@ class CFX_ByteString {
   friend class fxcrt_ByteStringConcat_Test;
 };
 
-inline CFX_ByteStringC& CFX_ByteStringC::operator=(const CFX_ByteString& src) {
-  m_Ptr = src.raw_str();
-  m_Length = src.GetLength();
-  return *this;
-}
-
 inline bool operator==(const char* lhs, const CFX_ByteString& rhs) {
   return rhs == lhs;
 }
@@ -398,8 +390,6 @@ class CFX_WideStringC {
     return *this;
   }
 
-  CFX_WideStringC& operator=(const CFX_WideString& src);
-
   bool operator==(const wchar_t* ptr) const {
     return FXSYS_wcslen(ptr) == m_Length && wmemcmp(ptr, m_Ptr, m_Length) == 0;
   }
@@ -611,12 +601,6 @@ class CFX_WideString {
   friend class fxcrt_WideStringConcatInPlace_Test;
 };
 
-inline CFX_WideStringC& CFX_WideStringC::operator=(const CFX_WideString& src) {
-  m_Ptr = src.c_str();
-  m_Length = src.GetLength();
-  return *this;
-}
-
 inline CFX_WideString operator+(const CFX_WideStringC& str1,
                                 const CFX_WideStringC& str2) {
   return CFX_WideString(str1, str2);
diff --git a/core/fxge/dib/dib_int.h b/core/fxge/dib/dib_int.h
index 23dd0babba..ebb1ddc0ed 100644
--- a/core/fxge/dib/dib_int.h
+++ b/core/fxge/dib/dib_int.h
@@ -86,8 +86,8 @@ class CStretchEngine {
   int m_SrcWidth, m_SrcHeight;
   int m_SrcPitch, m_InterPitch;
   int m_ExtraMaskPitch;
-  unsigned char* m_pInterBuf;
-  unsigned char* m_pExtraAlphaBuf;
+  uint8_t* m_pInterBuf;
+  uint8_t* m_pExtraAlphaBuf;
   int m_TransMethod;
   int m_Flags;
   CWeightTable m_WeightTable;