The Tor Browser / file revision

 // FilePathAutoRename.cpp

 #include "StdAfx.h"

 #include "FilePathAutoRename.h"

 #include "Common/Defs.h"

 #include "Common/IntToString.h"

 #include "Windows/FileName.h"

 #include "Windows/FileFind.h"

 using namespace NWindows;

 static bool MakeAutoName(const UString &name, 

     const UString &extension, int value, UString &path)

 {

   wchar_t number[32];

   ConvertUInt64ToString(value, number);

   path = name;

   path += number;

   path += extension;

   return NFile::NFind::DoesFileExist(path);

 }

 bool AutoRenamePath(UString &fullProcessedPath)

 {

   UString path;

   int dotPos = fullProcessedPath.ReverseFind(L'.');

   int slashPos = fullProcessedPath.ReverseFind(L'/');

   #ifdef _WIN32

   int slash1Pos = fullProcessedPath.ReverseFind(L'\\');

   slashPos = MyMax(slashPos, slash1Pos);

   #endif

   UString name, extension;

   if (dotPos > slashPos &&  dotPos > 0)

   {

     name = fullProcessedPath.Left(dotPos);

     extension = fullProcessedPath.Mid(dotPos);

   }

   else

     name = fullProcessedPath;

   name += L'_';

   int indexLeft = 1, indexRight = (1 << 30);

   while (indexLeft != indexRight)

   {

     int indexMid = (indexLeft + indexRight) / 2;

     if (MakeAutoName(name, extension, indexMid, path))

       indexLeft = indexMid + 1;

     else

       indexRight = indexMid;

   }

   if (MakeAutoName(name, extension, indexRight, fullProcessedPath))

     return false;

   return true;

 }