1 files changed, 59 insertions, 0 deletions
diff --git a/mozglue/misc/WindowsUnicode.cpp b/mozglue/misc/WindowsUnicode.cpp
new file mode 100644
index 0000000000..464380b6da
--- /dev/null
+++ b/mozglue/misc/WindowsUnicode.cpp
@@ -0,0 +1,59 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+#include "WindowsUnicode.h"
+
+#include <windows.h>
+// For UNICODE_STRING
+#include <winternl.h>
+
+#include <string.h>
+
+namespace mozilla {
+namespace glue {
+
+mozilla::UniquePtr<char[]> WideToUTF8(const wchar_t* aStr,
+                                      const size_t aStrLenExclNul) {
+  int numConv = ::WideCharToMultiByte(CP_UTF8, 0, aStr, aStrLenExclNul, nullptr,
+                                      0, nullptr, nullptr);
+  if (!numConv) {
+    return nullptr;
+  }
+
+  // Include room for the null terminator by adding one
+  auto buf = mozilla::MakeUnique<char[]>(numConv + 1);
+
+  numConv = ::WideCharToMultiByte(CP_UTF8, 0, aStr, aStrLenExclNul, buf.get(),
+                                  numConv, nullptr, nullptr);
+  if (!numConv) {
+    return nullptr;
+  }
+
+  // Add null termination. numConv does not include the terminator, so we don't
+  // subtract 1 when indexing into buf.
+  buf[numConv] = 0;
+
+  return buf;
+}
+
+mozilla::UniquePtr<char[]> WideToUTF8(const wchar_t* aStr) {
+  return WideToUTF8(aStr, wcslen(aStr));
+}
+
+mozilla::UniquePtr<char[]> WideToUTF8(const std::wstring& aStr) {
+  return WideToUTF8(aStr.data(), aStr.length());
+}
+
+mozilla::UniquePtr<char[]> WideToUTF8(PCUNICODE_STRING aStr) {
+  if (!aStr) {
+    return nullptr;
+  }
+
+  return WideToUTF8(aStr->Buffer, aStr->Length / sizeof(WCHAR));
+}
+
+}  // namespace glue
+}  // namespace mozilla