Get rid of NULLs in xfa/fxbarcode/

xfa/fxbarcode/oned/BC_OnedEAN8Writer.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
 // Original code is licensed as follows:
 /*
  * Copyright 2009 ZXing authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ skipping 74 matching lines @@
   int32_t checksum = (odd * 3 + even) % 10;
   checksum = (10 - checksum) % 10;
   return (checksum);
 }
 uint8_t* CBC_OnedEAN8Writer::Encode(const CFX_ByteString& contents,
                                     BCFORMAT format,
                                     int32_t& outWidth,
                                     int32_t& outHeight,
                                     int32_t& e) {
   uint8_t* ret = Encode(contents, format, outWidth, outHeight, 0, e);
-  BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+  BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
   return ret;
 }
 uint8_t* CBC_OnedEAN8Writer::Encode(const CFX_ByteString& contents,
                                     BCFORMAT format,
                                     int32_t& outWidth,
                                     int32_t& outHeight,
                                     int32_t hints,
                                     int32_t& e) {
   if (format != BCFORMAT_EAN_8) {
     e = BCExceptionOnlyEncodeEAN_8;
-    return NULL;
+    return nullptr;
   }
   uint8_t* ret =
       CBC_OneDimWriter::Encode(contents, format, outWidth, outHeight, hints, e);
-  BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+  BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
   return ret;
 }
 uint8_t* CBC_OnedEAN8Writer::Encode(const CFX_ByteString& contents,
                                     int32_t& outLength,
                                     int32_t& e) {
   if (contents.GetLength() != 8) {
     e = BCExceptionDigitLengthMustBe8;
-    return NULL;
+    return nullptr;
   }
   outLength = m_codeWidth;
   uint8_t* result = FX_Alloc(uint8_t, m_codeWidth);
   int32_t pos = 0;
   pos +=
       AppendPattern(result, pos, CBC_OneDimReader::START_END_PATTERN, 3, 1, e);
   if (e != BCExceptionNO) {
     FX_Free(result);
-    return NULL;
+    return nullptr;
   }
   int32_t i = 0;
   for (i = 0; i <= 3; i++) {
     int32_t digit = FXSYS_atoi(contents.Mid(i, 1).c_str());
     pos += AppendPattern(result, pos, CBC_OneDimReader::L_PATTERNS[digit], 4, 0,
                          e);
     if (e != BCExceptionNO) {
       FX_Free(result);
-      return NULL;
+      return nullptr;
     }
   }
   pos += AppendPattern(result, pos, CBC_OneDimReader::MIDDLE_PATTERN, 5, 0, e);
   if (e != BCExceptionNO) {
     FX_Free(result);
-    return NULL;
+    return nullptr;
   }
   for (i = 4; i <= 7; i++) {
     int32_t digit = FXSYS_atoi(contents.Mid(i, 1).c_str());
     pos += AppendPattern(result, pos, CBC_OneDimReader::L_PATTERNS[digit], 4, 1,
                          e);
     if (e != BCExceptionNO) {
       FX_Free(result);
-      return NULL;
+      return nullptr;
     }
   }
   pos +=
       AppendPattern(result, pos, CBC_OneDimReader::START_END_PATTERN, 3, 1, e);
   if (e != BCExceptionNO) {
     FX_Free(result);
-    return NULL;
+    return nullptr;
   }
   return result;
 }
 
 void CBC_OnedEAN8Writer::ShowChars(const CFX_WideStringC& contents,
                                    CFX_DIBitmap* pOutBitmap,
                                    CFX_RenderDevice* device,
                                    const CFX_Matrix* matrix,
                                    int32_t barWidth,
                                    int32_t multiple,
@@ skipping 94 matching lines @@
   FX_Free(pCharPos);
 }
 
 void CBC_OnedEAN8Writer::RenderResult(const CFX_WideStringC& contents,
                                       uint8_t* code,
                                       int32_t codeLength,
                                       FX_BOOL isDevice,
                                       int32_t& e) {
   CBC_OneDimWriter::RenderResult(contents, code, codeLength, isDevice, e);
 }