Fix an out-of-boundary issue for wide string

fpdfsdk/src/fpdftext.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/fsdk_define.h"
 #include "../include/fpdftext.h"
 
 #ifdef _WIN32
 #include <tchar.h>
 #endif
 
-        // jabdelmalek: commented out to build on Linux.  Not used.
+        // jabdelmalek: commented out to build on Linux.  Not used.
         // extern HANDLE g_hModule;
 
 DLLEXPORT FPDF_TEXTPAGE STDCALL FPDFText_LoadPage(FPDF_PAGE page)
 {
         if (!page) return NULL;
         IPDF_TextPage* textpage=NULL;
         try
         {
                 CPDF_ViewerPreferences viewRef(((CPDF_Page*)page)->m_pDocument);
                 textpage=IPDF_TextPage::CreateTextPage((CPDF_Page*)page,viewRef.IsDirectionR2L());
@@ skipping 130 matching lines @@
 
 //Search
 //-1 for end
 DLLEXPORT FPDF_SCHHANDLE STDCALL FPDFText_FindStart(FPDF_TEXTPAGE text_page,FPDF_WIDESTRING findwhat,unsigned long flags,int start_index)
 {
         if (!text_page) return NULL;
         IPDF_TextPageFind* textpageFind=NULL;
         try
         {
                 textpageFind=IPDF_TextPageFind::CreatePageFind((IPDF_TextPage*)text_page);
-                textpageFind->FindFirst(CFX_WideString::FromUTF16LE(findwhat),flags,start_index);
+                FX_STRSIZE len = CFX_WideString::WStringLength(findwhat);
+                textpageFind->FindFirst(CFX_WideString::FromUTF16LE(findwhat, len),flags,start_index);
         }
         catch (...)
         {
                 if (textpageFind)
                         delete textpageFind;
                 return NULL;            
         }
         return textpageFind;
 }
 DLLEXPORT FPDF_BOOL     STDCALL FPDFText_FindNext(FPDF_SCHHANDLE handle)
@@ skipping 93 matching lines @@
         *bottom=rect.bottom;
 }
 DLLEXPORT void  STDCALL FPDFLink_CloseWebLinks(FPDF_PAGELINK link_page)
 {
         if (!link_page) return;
         IPDF_LinkExtract* pageLink=(IPDF_LinkExtract*)link_page;
         delete pageLink;
         pageLink =NULL;
 }