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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.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+//
+// Contains classes used to keep track of unrecognized fields seen while
+// parsing a protocol message.
+
+#ifndef GOOGLE_PROTOBUF_UNKNOWN_FIELD_SET_H__
+#define GOOGLE_PROTOBUF_UNKNOWN_FIELD_SET_H__
+
+#include <assert.h>
+#include <string>
+#include <vector>
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/logging.h>
+
+namespace google {
+namespace protobuf {
+  namespace io {
+    class CodedInputStream;         // coded_stream.h
+    class CodedOutputStream;        // coded_stream.h
+    class ZeroCopyInputStream;      // zero_copy_stream.h
+  }
+  namespace internal {
+    class WireFormat;               // wire_format.h
+    class MessageSetFieldSkipperUsingCord;
+                                    // extension_set_heavy.cc
+  }
+
+class Message;                      // message.h
+class UnknownField;                 // below
+
+// An UnknownFieldSet contains fields that were encountered while parsing a
+// message but were not defined by its type.  Keeping track of these can be
+// useful, especially in that they may be written if the message is serialized
+// again without being cleared in between.  This means that software which
+// simply receives messages and forwards them to other servers does not need
+// to be updated every time a new field is added to the message definition.
+//
+// To get the UnknownFieldSet attached to any message, call
+// Reflection::GetUnknownFields().
+//
+// This class is necessarily tied to the protocol buffer wire format, unlike
+// the Reflection interface which is independent of any serialization scheme.
+class LIBPROTOBUF_EXPORT UnknownFieldSet {
+ public:
+  UnknownFieldSet();
+  ~UnknownFieldSet();
+
+  // Remove all fields.
+  inline void Clear();
+
+  // Remove all fields and deallocate internal data objects
+  void ClearAndFreeMemory();
+
+  // Is this set empty?
+  inline bool empty() const;
+
+  // Merge the contents of some other UnknownFieldSet with this one.
+  void MergeFrom(const UnknownFieldSet& other);
+
+  // Similar to above, but this function will destroy the contents of other.
+  void MergeFromAndDestroy(UnknownFieldSet* other);
+
+  // Swaps the contents of some other UnknownFieldSet with this one.
+  inline void Swap(UnknownFieldSet* x);
+
+  // Computes (an estimate of) the total number of bytes currently used for
+  // storing the unknown fields in memory. Does NOT include
+  // sizeof(*this) in the calculation.
+  int SpaceUsedExcludingSelf() const;
+
+  // Version of SpaceUsed() including sizeof(*this).
+  int SpaceUsed() const;
+
+  // Returns the number of fields present in the UnknownFieldSet.
+  inline int field_count() const;
+  // Get a field in the set, where 0 <= index < field_count().  The fields
+  // appear in the order in which they were added.
+  inline const UnknownField& field(int index) const;
+  // Get a mutable pointer to a field in the set, where
+  // 0 <= index < field_count().  The fields appear in the order in which
+  // they were added.
+  inline UnknownField* mutable_field(int index);
+
+  // Adding fields ---------------------------------------------------
+
+  void AddVarint(int number, uint64 value);
+  void AddFixed32(int number, uint32 value);
+  void AddFixed64(int number, uint64 value);
+  void AddLengthDelimited(int number, const string& value);
+  string* AddLengthDelimited(int number);
+  UnknownFieldSet* AddGroup(int number);
+
+  // Adds an unknown field from another set.
+  void AddField(const UnknownField& field);
+
+  // Delete fields with indices in the range [start .. start+num-1].
+  // Caution: implementation moves all fields with indices [start+num .. ].
+  void DeleteSubrange(int start, int num);
+
+  // Delete all fields with a specific field number. The order of left fields
+  // is preserved.
+  // Caution: implementation moves all fields after the first deleted field.
+  void DeleteByNumber(int number);
+
+  // Parsing helpers -------------------------------------------------
+  // These work exactly like the similarly-named methods of Message.
+
+  bool MergeFromCodedStream(io::CodedInputStream* input);
+  bool ParseFromCodedStream(io::CodedInputStream* input);
+  bool ParseFromZeroCopyStream(io::ZeroCopyInputStream* input);
+  bool ParseFromArray(const void* data, int size);
+  inline bool ParseFromString(const string& data) {
+    return ParseFromArray(data.data(), static_cast<int>(data.size()));
+  }
+
+  static const UnknownFieldSet* default_instance();
+ private:
+  // For InternalMergeFrom
+  friend class UnknownField;
+  // Merges from other UnknownFieldSet. This method assumes, that this object
+  // is newly created and has fields_ == NULL;
+  void InternalMergeFrom(const UnknownFieldSet& other);
+  void ClearFallback();
+
+  // fields_ is either NULL, or a pointer to a vector that is *non-empty*. We
+  // never hold the empty vector because we want the 'do we have any unknown
+  // fields' check to be fast, and avoid a cache miss: the UFS instance gets
+  // embedded in the message object, so 'fields_ != NULL' tests a member
+  // variable hot in the cache, without the need to go touch a vector somewhere
+  // else in memory.
+  std::vector<UnknownField>* fields_;
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(UnknownFieldSet);
+};
+
+// Represents one field in an UnknownFieldSet.
+class LIBPROTOBUF_EXPORT UnknownField {
+ public:
+  enum Type {
+    TYPE_VARINT,
+    TYPE_FIXED32,
+    TYPE_FIXED64,
+    TYPE_LENGTH_DELIMITED,
+    TYPE_GROUP
+  };
+
+  // The field's tag number, as seen on the wire.
+  inline int number() const;
+
+  // The field type.
+  inline Type type() const;
+
+  // Accessors -------------------------------------------------------
+  // Each method works only for UnknownFields of the corresponding type.
+
+  inline uint64 varint() const;
+  inline uint32 fixed32() const;
+  inline uint64 fixed64() const;
+  inline const string& length_delimited() const;
+  inline const UnknownFieldSet& group() const;
+
+  inline void set_varint(uint64 value);
+  inline void set_fixed32(uint32 value);
+  inline void set_fixed64(uint64 value);
+  inline void set_length_delimited(const string& value);
+  inline string* mutable_length_delimited();
+  inline UnknownFieldSet* mutable_group();
+
+  // Serialization API.
+  // These methods can take advantage of the underlying implementation and may
+  // archieve a better performance than using getters to retrieve the data and
+  // do the serialization yourself.
+  void SerializeLengthDelimitedNoTag(io::CodedOutputStream* output) const;
+  uint8* SerializeLengthDelimitedNoTagToArray(uint8* target) const;
+
+  inline int GetLengthDelimitedSize() const;
+
+ private:
+  friend class UnknownFieldSet;
+
+  // If this UnknownField contains a pointer, delete it.
+  void Delete();
+
+  // Reset all the underlying pointers to NULL. A special function to be only
+  // used while merging from a temporary UFS.
+  void Reset();
+
+  // Make a deep copy of any pointers in this UnknownField.
+  void DeepCopy(const UnknownField& other);
+
+  // Set the wire type of this UnknownField. Should only be used when this
+  // UnknownField is being created.
+  inline void SetType(Type type);
+
+  union LengthDelimited {
+    string* string_value_;
+  };
+
+  uint32 number_;
+  uint32 type_;
+  union {
+    uint64 varint_;
+    uint32 fixed32_;
+    uint64 fixed64_;
+    mutable union LengthDelimited length_delimited_;
+    UnknownFieldSet* group_;
+  };
+};
+
+// ===================================================================
+// inline implementations
+
+inline UnknownFieldSet::UnknownFieldSet() : fields_(NULL) {}
+
+inline UnknownFieldSet::~UnknownFieldSet() { Clear(); }
+
+inline void UnknownFieldSet::ClearAndFreeMemory() { Clear(); }
+
+inline void UnknownFieldSet::Clear() {
+  if (fields_ != NULL) {
+    ClearFallback();
+  }
+}
+
+inline bool UnknownFieldSet::empty() const {
+  // Invariant: fields_ is never empty if present.
+  return !fields_;
+}
+
+inline void UnknownFieldSet::Swap(UnknownFieldSet* x) {
+  std::swap(fields_, x->fields_);
+}
+
+inline int UnknownFieldSet::field_count() const {
+  return fields_ ? static_cast<int>(fields_->size()) : 0;
+}
+inline const UnknownField& UnknownFieldSet::field(int index) const {
+  GOOGLE_DCHECK(fields_ != NULL);
+  return (*fields_)[index];
+}
+inline UnknownField* UnknownFieldSet::mutable_field(int index) {
+  return &(*fields_)[index];
+}
+
+inline void UnknownFieldSet::AddLengthDelimited(
+    int number, const string& value) {
+  AddLengthDelimited(number)->assign(value);
+}
+
+
+inline int UnknownField::number() const { return number_; }
+inline UnknownField::Type UnknownField::type() const {
+  return static_cast<Type>(type_);
+}
+
+inline uint64 UnknownField::varint() const {
+  assert(type() == TYPE_VARINT);
+  return varint_;
+}
+inline uint32 UnknownField::fixed32() const {
+  assert(type() == TYPE_FIXED32);
+  return fixed32_;
+}
+inline uint64 UnknownField::fixed64() const {
+  assert(type() == TYPE_FIXED64);
+  return fixed64_;
+}
+inline const string& UnknownField::length_delimited() const {
+  assert(type() == TYPE_LENGTH_DELIMITED);
+  return *length_delimited_.string_value_;
+}
+inline const UnknownFieldSet& UnknownField::group() const {
+  assert(type() == TYPE_GROUP);
+  return *group_;
+}
+
+inline void UnknownField::set_varint(uint64 value) {
+  assert(type() == TYPE_VARINT);
+  varint_ = value;
+}
+inline void UnknownField::set_fixed32(uint32 value) {
+  assert(type() == TYPE_FIXED32);
+  fixed32_ = value;
+}
+inline void UnknownField::set_fixed64(uint64 value) {
+  assert(type() == TYPE_FIXED64);
+  fixed64_ = value;
+}
+inline void UnknownField::set_length_delimited(const string& value) {
+  assert(type() == TYPE_LENGTH_DELIMITED);
+  length_delimited_.string_value_->assign(value);
+}
+inline string* UnknownField::mutable_length_delimited() {
+  assert(type() == TYPE_LENGTH_DELIMITED);
+  return length_delimited_.string_value_;
+}
+inline UnknownFieldSet* UnknownField::mutable_group() {
+  assert(type() == TYPE_GROUP);
+  return group_;
+}
+
+inline int UnknownField::GetLengthDelimitedSize() const {
+  GOOGLE_DCHECK_EQ(TYPE_LENGTH_DELIMITED, type());
+  return static_cast<int>(length_delimited_.string_value_->size());
+}
+
+inline void UnknownField::SetType(Type type) {
+  type_ = type;
+}
+
+
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_UNKNOWN_FIELD_SET_H__