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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef GOOGLE_PROTOBUF_UTIL_CONVERTER_SNAKE2CAMEL_OBJECTWRITER_H__
+#define GOOGLE_PROTOBUF_UTIL_CONVERTER_SNAKE2CAMEL_OBJECTWRITER_H__
+
+#include <string>
+
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/strutil.h>
+#include <google/protobuf/stubs/stringpiece.h>
+#include <google/protobuf/util/internal/object_writer.h>
+#include <google/protobuf/util/internal/utility.h>
+
+namespace google {
+namespace protobuf {
+namespace util {
+namespace converter {
+
+// Snake2CamelObjectWriter is an ObjectWriter than translates each field name
+// from snake_case to camelCase. Typical usage is:
+//     ProtoStreamObjectSource psos(...);
+//     JsonObjectWriter jow(...);
+//     Snake2CamelObjectWriter snake_to_camel(&jow);
+//     psos.writeTo(&snake_to_camel);
+class Snake2CamelObjectWriter : public ObjectWriter {
+ public:
+  explicit Snake2CamelObjectWriter(ObjectWriter* ow)
+      : ow_(ow), normalize_case_(true) {}
+  virtual ~Snake2CamelObjectWriter() {}
+
+  // ObjectWriter methods.
+  virtual Snake2CamelObjectWriter* StartObject(StringPiece name) {
+    ow_->StartObject(ShouldNormalizeCase(name)
+                         ? StringPiece(StringPiece(ToCamelCase(name)))
+                         : name);
+    return this;
+  }
+
+  virtual Snake2CamelObjectWriter* EndObject() {
+    ow_->EndObject();
+    return this;
+  }
+
+  virtual Snake2CamelObjectWriter* StartList(StringPiece name) {
+    ow_->StartList(ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name))
+                                             : name);
+    return this;
+  }
+
+  virtual Snake2CamelObjectWriter* EndList() {
+    ow_->EndList();
+    return this;
+  }
+
+  virtual Snake2CamelObjectWriter* RenderBool(StringPiece name, bool value) {
+    ow_->RenderBool(
+        ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name)) : name,
+        value);
+    return this;
+  }
+
+  virtual Snake2CamelObjectWriter* RenderInt32(StringPiece name, int32 value) {
+    ow_->RenderInt32(
+        ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name)) : name,
+        value);
+    return this;
+  }
+
+  virtual Snake2CamelObjectWriter* RenderUint32(StringPiece name,
+                                                uint32 value) {
+    ow_->RenderUint32(
+        ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name)) : name,
+        value);
+    return this;
+  }
+
+  virtual Snake2CamelObjectWriter* RenderInt64(StringPiece name, int64 value) {
+    ow_->RenderInt64(
+        ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name)) : name,
+        value);
+    return this;
+  }
+
+  virtual Snake2CamelObjectWriter* RenderUint64(StringPiece name,
+                                                uint64 value) {
+    ow_->RenderUint64(
+        ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name)) : name,
+        value);
+    return this;
+  }
+
+  virtual Snake2CamelObjectWriter* RenderDouble(StringPiece name,
+                                                double value) {
+    ow_->RenderDouble(
+        ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name)) : name,
+        value);
+    return this;
+  }
+
+  virtual Snake2CamelObjectWriter* RenderFloat(StringPiece name, float value) {
+    ow_->RenderFloat(
+        ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name)) : name,
+        value);
+    return this;
+  }
+
+  virtual Snake2CamelObjectWriter* RenderString(StringPiece name,
+                                                StringPiece value) {
+    ow_->RenderString(
+        ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name)) : name,
+        value);
+    return this;
+  }
+
+  virtual Snake2CamelObjectWriter* RenderBytes(StringPiece name,
+                                               StringPiece value) {
+    ow_->RenderBytes(
+        ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name)) : name,
+        value);
+    return this;
+  }
+
+  virtual Snake2CamelObjectWriter* RenderNull(StringPiece name) {
+    ow_->RenderNull(ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name))
+                                              : name);
+    return this;
+  }
+
+  virtual Snake2CamelObjectWriter* DisableCaseNormalizationForNextKey() {
+    normalize_case_ = false;
+    return this;
+  }
+
+ private:
+  ObjectWriter* ow_;
+  bool normalize_case_;
+
+  bool ShouldNormalizeCase(StringPiece name) {
+    if (normalize_case_) {
+      return !IsCamel(name);
+    } else {
+      normalize_case_ = true;
+      return false;
+    }
+  }
+
+  bool IsCamel(StringPiece name) {
+    return name.empty() || (ascii_islower(name[0]) && !name.contains("_"));
+  }
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(Snake2CamelObjectWriter);
+};
+
+}  // namespace converter
+}  // namespace util
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_UTIL_CONVERTER_SNAKE2CAMEL_OBJECTWRITER_H__