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diff --git a/third_party/rapidjson/internal/strfunc.h b/third_party/rapidjson/internal/strfunc.h
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+// Tencent is pleased to support the open source community by making RapidJSON
+// available.
+//
+// Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All
+// rights reserved.
+//
+// Licensed under the MIT License (the "License"); you may not use this file
+// except in compliance with the License. You may obtain a copy of the License
+// at
+//
+// http://opensource.org/licenses/MIT
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+
+#ifndef RAPIDJSON_INTERNAL_STRFUNC_H_
+#define RAPIDJSON_INTERNAL_STRFUNC_H_
+
+#include "rapidjson/stream.h"
+
+RAPIDJSON_NAMESPACE_BEGIN
+namespace internal {
+
+//! Custom strlen() which works on different character types.
+/*! \tparam Ch Character type (e.g. char, wchar_t, short)
+    \param s Null-terminated input string.
+    \return Number of characters in the string.
+    \note This has the same semantics as strlen(), the return value is not
+   number of Unicode codepoints.
+*/
+template <typename Ch>
+inline SizeType StrLen(const Ch* s) {
+  const Ch* p = s;
+  while (*p)
+    ++p;
+  return SizeType(p - s);
+}
+
+//! Returns number of code points in a encoded string.
+template <typename Encoding>
+bool CountStringCodePoint(const typename Encoding::Ch* s,
+                          SizeType length,
+                          SizeType* outCount) {
+  GenericStringStream<Encoding> is(s);
+  const typename Encoding::Ch* end = s + length;
+  SizeType count = 0;
+  while (is.src_ < end) {
+    unsigned codepoint;
+    if (!Encoding::Decode(is, &codepoint))
+      return false;
+    count++;
+  }
+  *outCount = count;
+  return true;
+}
+
+}  // namespace internal
+RAPIDJSON_NAMESPACE_END
+
+#endif  // RAPIDJSON_INTERNAL_STRFUNC_H_