Fix an out-of-boundary issue for wide string

core/src/fxcrt/fx_basic_util.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/fxcrt/fx_basic.h"
 #if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
 #include <sys/types.h>
 #include <dirent.h>
@@ skipping 255 matching lines @@
     CFX_ByteString rURI;
     int nLength = bsURI.GetLength();
     for (int i = 0; i < nLength; i++) {
         if (i < nLength - 2 && bsURI[i] == '%' && FX_IsXDigit(bsURI[i + 1]) && FX_IsXDigit(bsURI[i + 2])) {
             rURI += (FX_HexToI(bsURI[i + 1]) << 4 | FX_HexToI(bsURI[i + 2]));
             i += 2;
         } else {
             rURI += bsURI[i];
         }
     }
-    return CFX_WideString::FromUTF8(rURI);
+    return CFX_WideString::FromUTF8(rURI, rURI.GetLength());
 }
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
 class CFindFileData : public CFX_Object
 {
 public:
     virtual ~CFindFileData() {}
     HANDLE                              m_Handle;
     FX_BOOL                             m_bEnd;
 };
 class CFindFileDataA : public CFindFileData
@@ skipping 148 matching lines @@
 #endif
 }
 FX_WCHAR FX_GetFolderSeparator()
 {
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
     return '\\';
 #else
     return '/';
 #endif
 }