Remove use of tmpnam.

This solves compilation with the Mac SDK 10.9.

BUG=3120, 3151
TEST=git try -t modules_tests:VideoProcessorIntegrationTest*
R=fischman@webrtc.org, henrike@webrtc.org, stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/10739005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5917 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/system_wrappers/interface/utf_util_win.h b/webrtc/system_wrappers/interface/utf_util_win.h
new file mode 100644
index 0000000..f88f079
--- /dev/null
+++ b/webrtc/system_wrappers/interface/utf_util_win.h
@@ -0,0 +1,57 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Conversion functions for UTF-8 and UTF-16 strings on Windows.
+// Duplicated from talk/base/win32.h.
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_UTF_UTIL_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_UTF_UTIL_H_
+
+#ifdef WIN32
+#include <windows.h>
+#include <string>
+
+#include "webrtc/system_wrappers/interface/scoped_ptr.h"
+
+namespace webrtc {
+
+inline std::wstring ToUtf16(const char* utf8, size_t len) {
+  int len16 = ::MultiByteToWideChar(CP_UTF8, 0, utf8, static_cast<int>(len),
+                                    NULL, 0);
+  scoped_ptr<wchar_t[]> ws(new wchar_t[len16]);
+  ::MultiByteToWideChar(CP_UTF8, 0, utf8, static_cast<int>(len), ws.get(),
+                        len16);
+  return std::wstring(ws.get(), len16);
+}
+
+inline std::wstring ToUtf16(const std::string& str) {
+  return ToUtf16(str.data(), str.length());
+}
+
+inline std::string ToUtf8(const wchar_t* wide, size_t len) {
+  int len8 = ::WideCharToMultiByte(CP_UTF8, 0, wide, static_cast<int>(len),
+                                   NULL, 0, NULL, NULL);
+  scoped_ptr<char[]> ns(new char[len8]);
+  ::WideCharToMultiByte(CP_UTF8, 0, wide, static_cast<int>(len), ns.get(), len8,
+                        NULL, NULL);
+  return std::string(ns.get(), len8);
+}
+
+inline std::string ToUtf8(const wchar_t* wide) {
+  return ToUtf8(wide, wcslen(wide));
+}
+
+inline std::string ToUtf8(const std::wstring& wstr) {
+  return ToUtf8(wstr.data(), wstr.length());
+}
+
+}  // namespace webrtc
+
+#endif  // WIN32
+#endif  // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_UTF_UTIL_H_