diff -r ea891871f481 -r bb5522e88ab2 misc/libphysfs/lzma/CPP/7zip/Common/FilePathAutoRename.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libphysfs/lzma/CPP/7zip/Common/FilePathAutoRename.cpp	Mon Apr 10 12:06:43 2017 -0400
@@ -0,0 +1,57 @@
+// 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;
+}