Make constructors recognize char[n] vs. char* and avoid strlen calls.

core/src/fpdfdoc/doc_basic.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 "../../include/fpdfdoc/fpdf_doc.h"
 const int nMaxRecursion = 32;
 int CPDF_Dest::GetPageIndex(CPDF_Document* pDoc)
 {
@@ skipping 512 matching lines @@
         }
         n--;
     }
     if (pValue != NULL) {
         pValue = pValue->GetDirect();
         if (pValue->GetType() == PDFOBJ_DICTIONARY) {
             CPDF_Dictionary* pLabel = (CPDF_Dictionary*)pValue;
             if (pLabel->KeyExist(FX_BSTRC("P"))) {
                 wsLabel += pLabel->GetUnicodeText(FX_BSTRC("P"));
             }
-            CFX_ByteString bsNumberingStyle = pLabel->GetString(FX_BSTRC("S"), NULL);
+            CFX_ByteString bsNumberingStyle = pLabel->GetString(FX_BSTRC("S"), CFX_ByteStringC());
             int nLabelNum = nPage - n + pLabel->GetInteger(FX_BSTRC("St"), 1);
             CFX_WideString wsNumPortion = _GetLabelNumPortion(nLabelNum, bsNumberingStyle);
             wsLabel += wsNumPortion;
             return wsLabel;
         }
     }
     wsLabel.Format(L"%d", nPage + 1);
     return wsLabel;
 }
 FX_INT32 CPDF_PageLabel::GetPageByLabel(FX_BSTR bsLabel) const
@@ skipping 19 matching lines @@
     if (nPage > 0 && nPage <= nPages) {
         return nPage;
     }
     return -1;
 }
 FX_INT32 CPDF_PageLabel::GetPageByLabel(FX_WSTR wsLabel) const
 {
     CFX_ByteString bsLabel = PDF_EncodeText(wsLabel.GetPtr());
     return GetPageByLabel(bsLabel);
 }