Get rid of most instance of 'foo == NULL'

core/src/fxcrt/fx_basic_wstring.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include <stddef.h>  // For offsetof().
 #include <cctype>
 
 #include "core/include/fxcrt/fx_basic.h"
@@ skipping 25 matching lines @@
 
   void* pData = FX_Alloc(uint8_t, totalSize);
   return new (pData) StringData(nLen, usableLen);
 }
 CFX_WideString::~CFX_WideString() {
   if (m_pData) {
     m_pData->Release();
   }
 }
 CFX_WideString::CFX_WideString(const CFX_WideString& stringSrc) {
-  if (stringSrc.m_pData == NULL) {
+  if (!stringSrc.m_pData) {
     m_pData = NULL;
     return;
   }
   if (stringSrc.m_pData->m_nRefs >= 0) {
     m_pData = stringSrc.m_pData;
     m_pData->Retain();
   } else {
     m_pData = NULL;
     *this = stringSrc;
   }
@@ skipping 37 matching lines @@
   }
   m_pData = StringData::Create(nNewLen);
   if (m_pData) {
     FXSYS_memcpy(m_pData->m_String, str1.GetPtr(),
                  str1.GetLength() * sizeof(FX_WCHAR));
     FXSYS_memcpy(m_pData->m_String + str1.GetLength(), str2.GetPtr(),
                  str2.GetLength() * sizeof(FX_WCHAR));
   }
 }
 void CFX_WideString::ReleaseBuffer(FX_STRSIZE nNewLength) {
-  if (m_pData == NULL) {
+  if (!m_pData) {
     return;
   }
   CopyBeforeWrite();
   if (nNewLength == -1) {
     nNewLength = m_pData ? FXSYS_wcslen(m_pData->m_String) : 0;
   }
   if (nNewLength == 0) {
     Empty();
     return;
   }
   FXSYS_assert(nNewLength <= m_pData->m_nAllocLength);
   m_pData->m_nDataLength = nNewLength;
   m_pData->m_String[nNewLength] = 0;
 }
 const CFX_WideString& CFX_WideString::operator=(const FX_WCHAR* lpsz) {
-  if (lpsz == NULL || lpsz[0] == 0) {
+  if (!lpsz || lpsz[0] == 0) {
     Empty();
   } else {
     AssignCopy(FXSYS_wcslen(lpsz), lpsz);
   }
   return *this;
 }
 const CFX_WideString& CFX_WideString::operator=(
     const CFX_WideStringC& stringSrc) {
   if (stringSrc.IsEmpty()) {
     Empty();
@@ skipping 25 matching lines @@
   ConcatInPlace(1, &ch);
   return *this;
 }
 const CFX_WideString& CFX_WideString::operator+=(const FX_WCHAR* lpsz) {
   if (lpsz) {
     ConcatInPlace(FXSYS_wcslen(lpsz), lpsz);
   }
   return *this;
 }
 const CFX_WideString& CFX_WideString::operator+=(const CFX_WideString& string) {
-  if (string.m_pData == NULL) {
+  if (!string.m_pData) {
     return *this;
   }
   ConcatInPlace(string.m_pData->m_nDataLength, string.m_pData->m_String);
   return *this;
 }
 const CFX_WideString& CFX_WideString::operator+=(
     const CFX_WideStringC& string) {
   if (string.IsEmpty()) {
     return *this;
   }
   ConcatInPlace(string.GetLength(), string.GetPtr());
   return *this;
 }
 bool CFX_WideString::Equal(const wchar_t* ptr) const {
   if (!m_pData) {
     return !ptr || ptr[0] == L'\0';
   }
   if (!ptr) {
     return m_pData->m_nDataLength == 0;
   }
   return wcslen(ptr) == m_pData->m_nDataLength &&
          wmemcmp(ptr, m_pData->m_String, m_pData->m_nDataLength) == 0;
 }
 bool CFX_WideString::Equal(const CFX_WideStringC& str) const {
-  if (m_pData == NULL) {
+  if (!m_pData) {
     return str.IsEmpty();
   }
   return str.GetLength() == m_pData->m_nDataLength &&
          wmemcmp(str.GetPtr(), m_pData->m_String, m_pData->m_nDataLength) == 0;
 }
 bool CFX_WideString::Equal(const CFX_WideString& other) const {
   if (IsEmpty()) {
     return other.IsEmpty();
   }
   if (other.IsEmpty()) {
     return false;
   }
   return other.m_pData->m_nDataLength == m_pData->m_nDataLength &&
          wmemcmp(other.m_pData->m_String, m_pData->m_String,
                  m_pData->m_nDataLength) == 0;
 }
 void CFX_WideString::Empty() {
   if (m_pData) {
     m_pData->Release();
     m_pData = NULL;
   }
 }
 void CFX_WideString::ConcatInPlace(FX_STRSIZE nSrcLen,
                                    const FX_WCHAR* lpszSrcData) {
-  if (nSrcLen == 0 || lpszSrcData == NULL) {
+  if (nSrcLen == 0 || !lpszSrcData) {
     return;
   }
-  if (m_pData == NULL) {
+  if (!m_pData) {
     m_pData = StringData::Create(nSrcLen);
     if (m_pData) {
       FXSYS_memcpy(m_pData->m_String, lpszSrcData, nSrcLen * sizeof(FX_WCHAR));
     }
     return;
   }
   if (m_pData->m_nRefs > 1 ||
       m_pData->m_nDataLength + nSrcLen > m_pData->m_nAllocLength) {
     ConcatCopy(m_pData->m_nDataLength, m_pData->m_String, nSrcLen, lpszSrcData);
   } else {
@@ skipping 14 matching lines @@
   // Don't release until done copying, might be one of the arguments.
   StringData* pOldData = m_pData;
   m_pData = StringData::Create(nNewLen);
   if (m_pData) {
     wmemcpy(m_pData->m_String, lpszSrc1Data, nSrc1Len);
     wmemcpy(m_pData->m_String + nSrc1Len, lpszSrc2Data, nSrc2Len);
   }
   pOldData->Release();
 }
 void CFX_WideString::CopyBeforeWrite() {
-  if (m_pData == NULL || m_pData->m_nRefs <= 1) {
+  if (!m_pData || m_pData->m_nRefs <= 1) {
     return;
   }
   StringData* pData = m_pData;
   m_pData->Release();
   FX_STRSIZE nDataLength = pData->m_nDataLength;
   m_pData = StringData::Create(nDataLength);
   if (m_pData) {
     FXSYS_memcpy(m_pData->m_String, pData->m_String,
                  (nDataLength + 1) * sizeof(FX_WCHAR));
   }
 }
 void CFX_WideString::AllocBeforeWrite(FX_STRSIZE nLen) {
   if (m_pData && m_pData->m_nRefs <= 1 && m_pData->m_nAllocLength >= nLen) {
     return;
   }
   Empty();
   m_pData = StringData::Create(nLen);
 }
 void CFX_WideString::AssignCopy(FX_STRSIZE nSrcLen,
                                 const FX_WCHAR* lpszSrcData) {
   AllocBeforeWrite(nSrcLen);
   FXSYS_memcpy(m_pData->m_String, lpszSrcData, nSrcLen * sizeof(FX_WCHAR));
   m_pData->m_nDataLength = nSrcLen;
   m_pData->m_String[nSrcLen] = 0;
 }
 int CFX_WideString::Compare(const FX_WCHAR* lpsz) const {
-  if (m_pData == NULL) {
-    return (lpsz == NULL || lpsz[0] == 0) ? 0 : -1;
-  }
-  return FXSYS_wcscmp(m_pData->m_String, lpsz);
+  if (m_pData)
+    return FXSYS_wcscmp(m_pData->m_String, lpsz);
+  return (!lpsz || lpsz[0] == 0) ? 0 : -1;
 }
 CFX_ByteString CFX_WideString::UTF8Encode() const {
   return FX_UTF8Encode(*this);
 }
 CFX_ByteString CFX_WideString::UTF16LE_Encode() const {
-  if (m_pData == NULL) {
+  if (!m_pData) {
     return CFX_ByteString("\0\0", 2);
   }
   int len = m_pData->m_nDataLength;
   CFX_ByteString result;
   FX_CHAR* buffer = result.GetBuffer(len * 2 + 2);
   for (int i = 0; i < len; i++) {
     buffer[i * 2] = m_pData->m_String[i] & 0xff;
     buffer[i * 2 + 1] = m_pData->m_String[i] >> 8;
   }
   buffer[len * 2] = 0;
   buffer[len * 2 + 1] = 0;
   result.ReleaseBuffer(len * 2 + 2);
   return result;
 }
 void CFX_WideString::ConvertFrom(const CFX_ByteString& str,
                                  CFX_CharMap* pCharMap) {
-  if (pCharMap == NULL) {
+  if (!pCharMap) {
     pCharMap = CFX_CharMap::GetDefaultMapper();
   }
   *this = pCharMap->m_GetWideString(pCharMap, str);
 }
 void CFX_WideString::Reserve(FX_STRSIZE len) {
   GetBuffer(len);
   ReleaseBuffer(GetLength());
 }
 FX_WCHAR* CFX_WideString::GetBuffer(FX_STRSIZE nMinBufLength) {
-  if (m_pData == NULL && nMinBufLength == 0) {
+  if (!m_pData && nMinBufLength == 0) {
     return NULL;
   }
   if (m_pData && m_pData->m_nRefs <= 1 &&
       m_pData->m_nAllocLength >= nMinBufLength) {
     return m_pData->m_String;
   }
-  if (m_pData == NULL) {
+  if (!m_pData) {
     m_pData = StringData::Create(nMinBufLength);
     if (!m_pData) {
       return NULL;
     }
     m_pData->m_nDataLength = 0;
     m_pData->m_String[0] = 0;
     return m_pData->m_String;
   }
   StringData* pOldData = m_pData;
   FX_STRSIZE nOldLen = pOldData->m_nDataLength;
@@ skipping 52 matching lines @@
                                FX_STRSIZE nCopyLen,
                                FX_STRSIZE nCopyIndex) const {
   // |FX_STRSIZE| is currently typedef'd as in |int|. TODO(palmer): It
   // should be a |size_t|, or at least unsigned.
   if (nCopyLen == 0 || nCopyLen < 0) {
     return;
   }
   pdfium::base::CheckedNumeric<FX_STRSIZE> iSize =
       static_cast<FX_STRSIZE>(sizeof(FX_WCHAR));
   iSize *= nCopyLen;
-  ASSERT(dest.m_pData == NULL);
+  ASSERT(!dest.m_pData);
   dest.m_pData = StringData::Create(nCopyLen);
   if (dest.m_pData) {
     FXSYS_memcpy(dest.m_pData->m_String, m_pData->m_String + nCopyIndex,
                  iSize.ValueOrDie());
   }
 }
 CFX_WideString CFX_WideString::Left(FX_STRSIZE nCount) const {
-  if (m_pData == NULL) {
+  if (!m_pData) {
     return CFX_WideString();
   }
   if (nCount < 0) {
     nCount = 0;
   }
   if (nCount >= m_pData->m_nDataLength) {
     return *this;
   }
   CFX_WideString dest;
   AllocCopy(dest, nCount, 0);
   return dest;
 }
 CFX_WideString CFX_WideString::Mid(FX_STRSIZE nFirst) const {
   return Mid(nFirst, m_pData->m_nDataLength - nFirst);
 }
 CFX_WideString CFX_WideString::Mid(FX_STRSIZE nFirst, FX_STRSIZE nCount) const {
-  if (m_pData == NULL) {
+  if (!m_pData) {
     return CFX_WideString();
   }
   if (nFirst < 0) {
     nFirst = 0;
   }
   if (nCount < 0) {
     nCount = 0;
   }
   if (nFirst + nCount > m_pData->m_nDataLength) {
     nCount = m_pData->m_nDataLength - nFirst;
   }
   if (nFirst > m_pData->m_nDataLength) {
     nCount = 0;
   }
   if (nFirst == 0 && nFirst + nCount == m_pData->m_nDataLength) {
     return *this;
   }
   CFX_WideString dest;
   AllocCopy(dest, nCount, nFirst);
   return dest;
 }
 CFX_WideString CFX_WideString::Right(FX_STRSIZE nCount) const {
-  if (m_pData == NULL) {
+  if (!m_pData) {
     return CFX_WideString();
   }
   if (nCount < 0) {
     nCount = 0;
   }
   if (nCount >= m_pData->m_nDataLength) {
     return *this;
   }
   CFX_WideString dest;
   AllocCopy(dest, nCount, m_pData->m_nDataLength - nCount);
   return dest;
 }
 int CFX_WideString::CompareNoCase(const FX_WCHAR* lpsz) const {
-  if (m_pData == NULL) {
-    return (lpsz == NULL || lpsz[0] == 0) ? 0 : -1;
+  if (!m_pData) {
+    return (!lpsz || lpsz[0] == 0) ? 0 : -1;
   }
   return FXSYS_wcsicmp(m_pData->m_String, lpsz);
 }
 int CFX_WideString::Compare(const CFX_WideString& str) const {
-  if (m_pData == NULL) {
-    if (str.m_pData == NULL) {
+  if (!m_pData) {
+    if (!str.m_pData) {
       return 0;
     }
     return -1;
   }
-  if (str.m_pData == NULL) {
+  if (!str.m_pData) {
     return 1;
   }
   int this_len = m_pData->m_nDataLength;
   int that_len = str.m_pData->m_nDataLength;
   int min_len = this_len < that_len ? this_len : that_len;
   for (int i = 0; i < min_len; i++) {
     if (m_pData->m_String[i] < str.m_pData->m_String[i]) {
       return -1;
     }
     if (m_pData->m_String[i] > str.m_pData->m_String[i]) {
       return 1;
     }
   }
   if (this_len < that_len) {
     return -1;
   }
   if (this_len > that_len) {
     return 1;
   }
   return 0;
 }
 void CFX_WideString::SetAt(FX_STRSIZE nIndex, FX_WCHAR ch) {
-  if (m_pData == NULL) {
+  if (!m_pData) {
     return;
   }
   ASSERT(nIndex >= 0);
   ASSERT(nIndex < m_pData->m_nDataLength);
   CopyBeforeWrite();
   m_pData->m_String[nIndex] = ch;
 }
 void CFX_WideString::MakeLower() {
-  if (m_pData == NULL) {
+  if (!m_pData) {
     return;
   }
   CopyBeforeWrite();
   if (GetLength() < 1) {
     return;
   }
   FXSYS_wcslwr(m_pData->m_String);
 }
 void CFX_WideString::MakeUpper() {
-  if (m_pData == NULL) {
+  if (!m_pData) {
     return;
   }
   CopyBeforeWrite();
   if (GetLength() < 1) {
     return;
   }
   FXSYS_wcsupr(m_pData->m_String);
 }
 FX_STRSIZE CFX_WideString::Find(const FX_WCHAR* lpszSub,
                                 FX_STRSIZE nStart) const {
   FX_STRSIZE nLength = GetLength();
   if (nLength < 1 || nStart > nLength) {
     return -1;
   }
   const FX_WCHAR* lpsz = FXSYS_wcsstr(m_pData->m_String + nStart, lpszSub);
-  return (lpsz == NULL) ? -1 : (int)(lpsz - m_pData->m_String);
+  return lpsz ? (int)(lpsz - m_pData->m_String) : -1;
 }
 FX_STRSIZE CFX_WideString::Find(FX_WCHAR ch, FX_STRSIZE nStart) const {
-  if (m_pData == NULL) {
+  if (!m_pData) {
     return -1;
   }
   FX_STRSIZE nLength = m_pData->m_nDataLength;
   if (nStart >= nLength) {
     return -1;
   }
   const FX_WCHAR* lpsz = FXSYS_wcschr(m_pData->m_String + nStart, ch);
-  return (lpsz == NULL) ? -1 : (int)(lpsz - m_pData->m_String);
+  return (lpsz) ? (int)(lpsz - m_pData->m_String) : -1;
 }
 void CFX_WideString::TrimRight(const FX_WCHAR* lpszTargetList) {
   FXSYS_assert(lpszTargetList);
-  if (m_pData == NULL || *lpszTargetList == 0) {
+  if (!m_pData || *lpszTargetList == 0) {
     return;
   }
   CopyBeforeWrite();
   FX_STRSIZE len = GetLength();
   if (len < 1) {
     return;
   }
   FX_STRSIZE pos = len;
   while (pos) {
-    if (FXSYS_wcschr(lpszTargetList, m_pData->m_String[pos - 1]) == NULL) {
+    if (!FXSYS_wcschr(lpszTargetList, m_pData->m_String[pos - 1])) {
       break;
     }
     pos--;
   }
   if (pos < len) {
     m_pData->m_String[pos] = 0;
     m_pData->m_nDataLength = pos;
   }
 }
 void CFX_WideString::TrimRight(FX_WCHAR chTarget) {
   FX_WCHAR str[2] = {chTarget, 0};
   TrimRight(str);
 }
 void CFX_WideString::TrimRight() {
   TrimRight(L"\x09\x0a\x0b\x0c\x0d\x20");
 }
 void CFX_WideString::TrimLeft(const FX_WCHAR* lpszTargets) {
   FXSYS_assert(lpszTargets);
-  if (m_pData == NULL || *lpszTargets == 0) {
+  if (!m_pData || *lpszTargets == 0) {
     return;
   }
   CopyBeforeWrite();
   if (GetLength() < 1) {
     return;
   }
   const FX_WCHAR* lpsz = m_pData->m_String;
   while (*lpsz != 0) {
-    if (FXSYS_wcschr(lpszTargets, *lpsz) == NULL) {
+    if (!FXSYS_wcschr(lpszTargets, *lpsz)) {
       break;
     }
     lpsz++;
   }
   if (lpsz != m_pData->m_String) {
     int nDataLength =
         m_pData->m_nDataLength - (FX_STRSIZE)(lpsz - m_pData->m_String);
     FXSYS_memmove(m_pData->m_String, lpsz,
                   (nDataLength + 1) * sizeof(FX_WCHAR));
     m_pData->m_nDataLength = nDataLength;
   }
 }
 void CFX_WideString::TrimLeft(FX_WCHAR chTarget) {
   FX_WCHAR str[2] = {chTarget, 0};
   TrimLeft(str);
 }
 void CFX_WideString::TrimLeft() {
   TrimLeft(L"\x09\x0a\x0b\x0c\x0d\x20");
 }
 FX_STRSIZE CFX_WideString::Replace(const FX_WCHAR* lpszOld,
                                    const FX_WCHAR* lpszNew) {
   if (GetLength() < 1) {
     return 0;
   }
-  if (lpszOld == NULL) {
+  if (!lpszOld) {
     return 0;
   }
   FX_STRSIZE nSourceLen = FXSYS_wcslen(lpszOld);
   if (nSourceLen == 0) {
     return 0;
   }
   FX_STRSIZE nReplacementLen = lpszNew ? FXSYS_wcslen(lpszNew) : 0;
   FX_STRSIZE nCount = 0;
   FX_WCHAR* lpszStart = m_pData->m_String;
   FX_WCHAR* lpszEnd = m_pData->m_String + m_pData->m_nDataLength;
@@ skipping 46 matching lines @@
 FX_STRSIZE CFX_WideString::Insert(FX_STRSIZE nIndex, FX_WCHAR ch) {
   CopyBeforeWrite();
   if (nIndex < 0) {
     nIndex = 0;
   }
   FX_STRSIZE nNewLength = GetLength();
   if (nIndex > nNewLength) {
     nIndex = nNewLength;
   }
   nNewLength++;
-  if (m_pData == NULL || m_pData->m_nAllocLength < nNewLength) {
+  if (!m_pData || m_pData->m_nAllocLength < nNewLength) {
     StringData* pOldData = m_pData;
     const FX_WCHAR* pstr = m_pData->m_String;
     m_pData = StringData::Create(nNewLength);
     if (!m_pData) {
       return 0;
     }
     if (pOldData) {
       FXSYS_memmove(m_pData->m_String, pstr,
                     (pOldData->m_nDataLength + 1) * sizeof(FX_WCHAR));
       pOldData->Release();
@@ skipping 19 matching lines @@
     CopyBeforeWrite();
     int nBytesToCopy = nOldLength - (nIndex + nCount) + 1;
     FXSYS_memmove(m_pData->m_String + nIndex,
                   m_pData->m_String + nIndex + nCount,
                   nBytesToCopy * sizeof(FX_WCHAR));
     m_pData->m_nDataLength = nOldLength - nCount;
   }
   return m_pData->m_nDataLength;
 }
 FX_STRSIZE CFX_WideString::Remove(FX_WCHAR chRemove) {
-  if (m_pData == NULL) {
+  if (!m_pData) {
     return 0;
   }
   CopyBeforeWrite();
   if (GetLength() < 1) {
     return 0;
   }
   FX_WCHAR* pstrSource = m_pData->m_String;
   FX_WCHAR* pstrDest = m_pData->m_String;
   FX_WCHAR* pstrEnd = m_pData->m_String + m_pData->m_nDataLength;
   while (pstrSource < pstrEnd) {
@@ skipping 99 matching lines @@
         nItemLen = 2;
         va_arg(argList, int);
         break;
       case 'c' | FORCE_UNICODE:
       case 'C' | FORCE_UNICODE:
         nItemLen = 2;
         va_arg(argList, int);
         break;
       case 's': {
         const FX_WCHAR* pstrNextArg = va_arg(argList, const FX_WCHAR*);
-        if (pstrNextArg == NULL) {
-          nItemLen = 6;
-        } else {
+        if (pstrNextArg) {
           nItemLen = FXSYS_wcslen(pstrNextArg);
           if (nItemLen < 1) {
             nItemLen = 1;
           }
+        } else {
+          nItemLen = 6;
         }
       } break;
       case 'S': {
         const FX_CHAR* pstrNextArg = va_arg(argList, const FX_CHAR*);
-        if (pstrNextArg == NULL) {
-          nItemLen = 6;
-        } else {
+        if (pstrNextArg) {
           nItemLen = FXSYS_strlen(pstrNextArg);
           if (nItemLen < 1) {
             nItemLen = 1;
           }
+        } else {
+          nItemLen = 6;
         }
       } break;
       case 's' | FORCE_ANSI:
       case 'S' | FORCE_ANSI: {
         const FX_CHAR* pstrNextArg = va_arg(argList, const FX_CHAR*);
-        if (pstrNextArg == NULL) {
-          nItemLen = 6;
-        } else {
+        if (pstrNextArg) {
           nItemLen = FXSYS_strlen(pstrNextArg);
           if (nItemLen < 1) {
             nItemLen = 1;
           }
+        } else {
+          nItemLen = 6;
         }
       } break;
       case 's' | FORCE_UNICODE:
       case 'S' | FORCE_UNICODE: {
         FX_WCHAR* pstrNextArg = va_arg(argList, FX_WCHAR*);
-        if (pstrNextArg == NULL) {
-          nItemLen = 6;
-        } else {
+        if (pstrNextArg) {
           nItemLen = FXSYS_wcslen(pstrNextArg);
           if (nItemLen < 1) {
             nItemLen = 1;
           }
+        } else {
+          nItemLen = 6;
         }
       } break;
     }
     if (nItemLen != 0) {
       if (nPrecision != 0 && nItemLen > nPrecision) {
         nItemLen = nPrecision;
       }
       if (nItemLen < nWidth) {
         nItemLen = nWidth;
       }
@@ skipping 94 matching lines @@
     while (cc < len) {
       fraction += scale * FXSYS_toDecimalDigitWide(str[cc]);
       scale *= 0.1f;
       cc++;
     }
   }
   fraction += (FX_FLOAT)integer;
   return bNegative ? -fraction : fraction;
 }
 int CFX_WideString::GetInteger() const {
-  if (m_pData == NULL) {
-    return 0;
-  }
-  return FXSYS_wtoi(m_pData->m_String);
+  return m_pData ? FXSYS_wtoi(m_pData->m_String) : 0;
 }
 FX_FLOAT CFX_WideString::GetFloat() const {
-  if (m_pData == NULL) {
-    return 0.0;
-  }
-  return FX_wtof(m_pData->m_String, m_pData->m_nDataLength);
+  return m_pData ? FX_wtof(m_pData->m_String, m_pData->m_nDataLength) : 0.0;
 }
 static CFX_ByteString _DefMap_GetByteString(CFX_CharMap* pCharMap,
                                             const CFX_WideString& widestr) {
   int src_len = widestr.GetLength();
   int codepage = pCharMap->m_GetCodePage ? pCharMap->m_GetCodePage() : 0;
   int dest_len = FXSYS_WideCharToMultiByte(codepage, 0, widestr.c_str(),
                                            src_len, NULL, 0, NULL, NULL);
   if (dest_len == 0) {
     return CFX_ByteString();
   }
@@ skipping 49 matching lines @@
       return (CFX_CharMap*)&g_DefaultJISMapper;
     case 936:
       return (CFX_CharMap*)&g_DefaultGBKMapper;
     case 949:
       return (CFX_CharMap*)&g_DefaultUHCMapper;
     case 950:
       return (CFX_CharMap*)&g_DefaultBig5Mapper;
   }
   return NULL;
 }