Add LZMA.

3rdparty/lzma-21.03beta/CPP/7zip/Common/FilePathAutoRename.cpp

@@ -0,0 +1,46 @@
+// FilePathAutoRename.cpp
+
+#include "StdAfx.h"
+
+#include "../../Windows/FileFind.h"
+
+#include "FilePathAutoRename.h"
+
+using namespace NWindows;
+
+static bool MakeAutoName(const FString &name,
+    const FString &extension, UInt32 value, FString &path)
+{
+  path = name;
+  path.Add_UInt32(value);
+  path += extension;
+  return NFile::NFind::DoesFileOrDirExist(path);
+}
+
+bool AutoRenamePath(FString &path)
+{
+  int dotPos = path.ReverseFind_Dot();
+  int slashPos = path.ReverseFind_PathSepar();
+
+  FString name = path;
+  FString extension;
+  if (dotPos > slashPos + 1)
+  {
+    name.DeleteFrom((unsigned)dotPos);
+    extension = path.Ptr((unsigned)dotPos);
+  }
+  name += '_';
+  
+  FString temp;
+
+  UInt32 left = 1, right = ((UInt32)1 << 30);
+  while (left != right)
+  {
+    UInt32 mid = (left + right) / 2;
+    if (MakeAutoName(name, extension, mid, temp))
+      left = mid + 1;
+    else
+      right = mid;
+  }
+  return !MakeAutoName(name, extension, right, path);
+}