1 files changed, 31 insertions, 0 deletions
diff --git a/deps/v8/test/cctest/unicode-helpers.cc b/deps/v8/test/cctest/unicode-helpers.cc
new file mode 100644
index 0000000000..524e5936fc
--- /dev/null
+++ b/deps/v8/test/cctest/unicode-helpers.cc
@@ -0,0 +1,31 @@
+// Copyright 2018 the V8 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.
+
+#include "test/cctest/unicode-helpers.h"
+
+int Ucs2CharLength(unibrow::uchar c) {
+  if (c == unibrow::Utf8::kIncomplete || c == unibrow::Utf8::kBufferEmpty) {
+    return 0;
+  } else if (c < 0xFFFF) {
+    return 1;
+  } else {
+    return 2;
+  }
+}
+
+int Utf8LengthHelper(const char* s) {
+  unibrow::Utf8::Utf8IncrementalBuffer buffer(unibrow::Utf8::kBufferEmpty);
+  unibrow::Utf8::State state = unibrow::Utf8::State::kAccept;
+
+  int length = 0;
+  size_t i = 0;
+  while (s[i] != '\0') {
+    unibrow::uchar tmp =
+        unibrow::Utf8::ValueOfIncremental(s[i], &i, &state, &buffer);
+    length += Ucs2CharLength(tmp);
+  }
+  unibrow::uchar tmp = unibrow::Utf8::ValueOfIncrementalFinish(&state);
+  length += Ucs2CharLength(tmp);
+  return length;
+}