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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.
+
+// Utility functions to convert between protobuf binary format and proto3 JSON
+// format.
+#ifndef GOOGLE_PROTOBUF_UTIL_JSON_UTIL_H__
+#define GOOGLE_PROTOBUF_UTIL_JSON_UTIL_H__
+
+#include <google/protobuf/stubs/bytestream.h>
+#include <google/protobuf/stubs/status.h>
+#include <google/protobuf/stubs/strutil.h>
+#include <google/protobuf/message.h>
+#include <google/protobuf/util/type_resolver.h>
+
+// Must be included last.
+#include <google/protobuf/port_def.inc>
+
+namespace google {
+namespace protobuf {
+namespace io {
+class ZeroCopyInputStream;
+class ZeroCopyOutputStream;
+}  // namespace io
+namespace util {
+
+struct JsonParseOptions {
+  // Whether to ignore unknown JSON fields during parsing
+  bool ignore_unknown_fields;
+
+  // If true, when a lowercase enum value fails to parse, try convert it to
+  // UPPER_CASE and see if it matches a valid enum.
+  // WARNING: This option exists only to preserve legacy behavior. Avoid using
+  // this option. If your enum needs to support different casing, consider using
+  // allow_alias instead.
+  bool case_insensitive_enum_parsing;
+
+  JsonParseOptions()
+      : ignore_unknown_fields(false), case_insensitive_enum_parsing(false) {}
+};
+
+struct JsonPrintOptions {
+  // Whether to add spaces, line breaks and indentation to make the JSON output
+  // easy to read.
+  bool add_whitespace;
+  // Whether to always print primitive fields. By default proto3 primitive
+  // fields with default values will be omitted in JSON output. For example, an
+  // int32 field set to 0 will be omitted. Set this flag to true will override
+  // the default behavior and print primitive fields regardless of their values.
+  bool always_print_primitive_fields;
+  // Whether to always print enums as ints. By default they are rendered as
+  // strings.
+  bool always_print_enums_as_ints;
+  // Whether to preserve proto field names
+  bool preserve_proto_field_names;
+
+  JsonPrintOptions()
+      : add_whitespace(false),
+        always_print_primitive_fields(false),
+        always_print_enums_as_ints(false),
+        preserve_proto_field_names(false) {}
+};
+
+// DEPRECATED. Use JsonPrintOptions instead.
+typedef JsonPrintOptions JsonOptions;
+
+// Converts from protobuf message to JSON and appends it to |output|. This is a
+// simple wrapper of BinaryToJsonString(). It will use the DescriptorPool of the
+// passed-in message to resolve Any types.
+PROTOBUF_EXPORT util::Status MessageToJsonString(const Message& message,
+                                                 std::string* output,
+                                                 const JsonOptions& options);
+
+inline util::Status MessageToJsonString(const Message& message,
+                                        std::string* output) {
+  return MessageToJsonString(message, output, JsonOptions());
+}
+
+// Converts from JSON to protobuf message. This is a simple wrapper of
+// JsonStringToBinary(). It will use the DescriptorPool of the passed-in
+// message to resolve Any types.
+PROTOBUF_EXPORT util::Status JsonStringToMessage(
+    StringPiece input, Message* message, const JsonParseOptions& options);
+
+inline util::Status JsonStringToMessage(StringPiece input,
+                                        Message* message) {
+  return JsonStringToMessage(input, message, JsonParseOptions());
+}
+
+// Converts protobuf binary data to JSON.
+// The conversion will fail if:
+//   1. TypeResolver fails to resolve a type.
+//   2. input is not valid protobuf wire format, or conflicts with the type
+//      information returned by TypeResolver.
+// Note that unknown fields will be discarded silently.
+PROTOBUF_EXPORT util::Status BinaryToJsonStream(
+    TypeResolver* resolver, const std::string& type_url,
+    io::ZeroCopyInputStream* binary_input,
+    io::ZeroCopyOutputStream* json_output, const JsonPrintOptions& options);
+
+inline util::Status BinaryToJsonStream(TypeResolver* resolver,
+                                       const std::string& type_url,
+                                       io::ZeroCopyInputStream* binary_input,
+                                       io::ZeroCopyOutputStream* json_output) {
+  return BinaryToJsonStream(resolver, type_url, binary_input, json_output,
+                            JsonPrintOptions());
+}
+
+PROTOBUF_EXPORT util::Status BinaryToJsonString(
+    TypeResolver* resolver, const std::string& type_url,
+    const std::string& binary_input, std::string* json_output,
+    const JsonPrintOptions& options);
+
+inline util::Status BinaryToJsonString(TypeResolver* resolver,
+                                       const std::string& type_url,
+                                       const std::string& binary_input,
+                                       std::string* json_output) {
+  return BinaryToJsonString(resolver, type_url, binary_input, json_output,
+                            JsonPrintOptions());
+}
+
+// Converts JSON data to protobuf binary format.
+// The conversion will fail if:
+//   1. TypeResolver fails to resolve a type.
+//   2. input is not valid JSON format, or conflicts with the type
+//      information returned by TypeResolver.
+PROTOBUF_EXPORT util::Status JsonToBinaryStream(
+    TypeResolver* resolver, const std::string& type_url,
+    io::ZeroCopyInputStream* json_input,
+    io::ZeroCopyOutputStream* binary_output, const JsonParseOptions& options);
+
+inline util::Status JsonToBinaryStream(
+    TypeResolver* resolver, const std::string& type_url,
+    io::ZeroCopyInputStream* json_input,
+    io::ZeroCopyOutputStream* binary_output) {
+  return JsonToBinaryStream(resolver, type_url, json_input, binary_output,
+                            JsonParseOptions());
+}
+
+PROTOBUF_EXPORT util::Status JsonToBinaryString(
+    TypeResolver* resolver, const std::string& type_url,
+    StringPiece json_input, std::string* binary_output,
+    const JsonParseOptions& options);
+
+inline util::Status JsonToBinaryString(TypeResolver* resolver,
+                                       const std::string& type_url,
+                                       StringPiece json_input,
+                                       std::string* binary_output) {
+  return JsonToBinaryString(resolver, type_url, json_input, binary_output,
+                            JsonParseOptions());
+}
+
+namespace internal {
+// Internal helper class. Put in the header so we can write unit-tests for it.
+class PROTOBUF_EXPORT ZeroCopyStreamByteSink : public strings::ByteSink {
+ public:
+  explicit ZeroCopyStreamByteSink(io::ZeroCopyOutputStream* stream)
+      : stream_(stream), buffer_(nullptr), buffer_size_(0) {}
+  ~ZeroCopyStreamByteSink() override;
+
+  void Append(const char* bytes, size_t len) override;
+
+ private:
+  io::ZeroCopyOutputStream* stream_;
+  void* buffer_;
+  int buffer_size_;
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ZeroCopyStreamByteSink);
+};
+}  // namespace internal
+
+}  // namespace util
+}  // namespace protobuf
+}  // namespace google
+
+#include <google/protobuf/port_undef.inc>
+
+#endif  // GOOGLE_PROTOBUF_UTIL_JSON_UTIL_H__