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diff --git a/src/google/protobuf/util/internal/datapiece.h b/src/google/protobuf/util/internal/datapiece.h
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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_DATAPIECE_H__
+#define GOOGLE_PROTOBUF_UTIL_CONVERTER_DATAPIECE_H__
+
+#include <string>
+
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/stringpiece.h>
+#include <google/protobuf/stubs/statusor.h>
+
+
+namespace google {
+namespace protobuf {
+class Enum;
+} // namespace protobuf
+
+
+namespace protobuf {
+namespace util {
+namespace converter {
+
+// Container for a single piece of data together with its data type.
+//
+// For primitive types (int32, int64, uint32, uint64, double, float, bool),
+// the data is stored by value.
+//
+// For string, a StringPiece is stored. For Cord, a pointer to Cord is stored.
+// Just like StringPiece, the DataPiece class does not own the storage for
+// the actual string or Cord, so it is the user's responsiblity to guarantee
+// that the underlying storage is still valid when the DataPiece is accessed.
+class LIBPROTOBUF_EXPORT DataPiece {
+ public:
+ // Identifies data type of the value.
+ // These are the types supported by DataPiece.
+ enum Type {
+ TYPE_INT32 = 1,
+ TYPE_INT64 = 2,
+ TYPE_UINT32 = 3,
+ TYPE_UINT64 = 4,
+ TYPE_DOUBLE = 5,
+ TYPE_FLOAT = 6,
+ TYPE_BOOL = 7,
+ TYPE_ENUM = 8,
+ TYPE_STRING = 9,
+ TYPE_BYTES = 10,
+ TYPE_NULL = 11, // explicit NULL type
+ };
+
+ // Constructors and Destructor
+ explicit DataPiece(const int32 value) : type_(TYPE_INT32), i32_(value) {}
+ explicit DataPiece(const int64 value) : type_(TYPE_INT64), i64_(value) {}
+ explicit DataPiece(const uint32 value) : type_(TYPE_UINT32), u32_(value) {}
+ explicit DataPiece(const uint64 value) : type_(TYPE_UINT64), u64_(value) {}
+ explicit DataPiece(const double value) : type_(TYPE_DOUBLE), double_(value) {}
+ explicit DataPiece(const float value) : type_(TYPE_FLOAT), float_(value) {}
+ explicit DataPiece(const bool value) : type_(TYPE_BOOL), bool_(value) {}
+ explicit DataPiece(StringPiece value)
+ : type_(TYPE_STRING),
+ str_(StringPiecePod::CreateFromStringPiece(value)) {}
+ // Constructor for bytes. The second parameter is not used.
+ explicit DataPiece(StringPiece value, bool dummy)
+ : type_(TYPE_BYTES), str_(StringPiecePod::CreateFromStringPiece(value)) {}
+ DataPiece(const DataPiece& r) : type_(r.type_), str_(r.str_) {}
+ DataPiece& operator=(const DataPiece& x) {
+ type_ = x.type_;
+ str_ = x.str_;
+ return *this;
+ }
+
+ static DataPiece NullData() { return DataPiece(TYPE_NULL, 0); }
+
+ virtual ~DataPiece() {
+ }
+
+ // Accessors
+ Type type() const { return type_; }
+
+ StringPiece str() const {
+ GOOGLE_LOG_IF(DFATAL, type_ != TYPE_STRING) << "Not a string type.";
+ return str_;
+ }
+
+
+ // Parses, casts or converts the value stored in the DataPiece into an int32.
+ util::StatusOr<int32> ToInt32() const;
+
+ // Parses, casts or converts the value stored in the DataPiece into a uint32.
+ util::StatusOr<uint32> ToUint32() const;
+
+ // Parses, casts or converts the value stored in the DataPiece into an int64.
+ util::StatusOr<int64> ToInt64() const;
+
+ // Parses, casts or converts the value stored in the DataPiece into a uint64.
+ util::StatusOr<uint64> ToUint64() const;
+
+ // Parses, casts or converts the value stored in the DataPiece into a double.
+ util::StatusOr<double> ToDouble() const;
+
+ // Parses, casts or converts the value stored in the DataPiece into a float.
+ util::StatusOr<float> ToFloat() const;
+
+ // Parses, casts or converts the value stored in the DataPiece into a bool.
+ util::StatusOr<bool> ToBool() const;
+
+ // Parses, casts or converts the value stored in the DataPiece into a string.
+ util::StatusOr<string> ToString() const;
+
+ // Tries to convert the value contained in this datapiece to string. If the
+ // conversion fails, it returns the default_string.
+ string ValueAsStringOrDefault(StringPiece default_string) const;
+
+ util::StatusOr<string> ToBytes() const;
+
+ // Converts a value into protocol buffer enum number. If the value is a
+ // string, first attempts conversion by name, trying names as follows:
+ // 1) the directly provided string value.
+ // 2) the value upper-cased and replacing '-' by '_'
+ // If the value is not a string, attempts to convert to a 32-bit integer.
+ // If none of these succeeds, returns a conversion error status.
+ util::StatusOr<int> ToEnum(const google::protobuf::Enum* enum_type) const;
+
+ private:
+ // Disallow implicit constructor.
+ DataPiece();
+
+ // Helper to create NULL or ENUM types.
+ DataPiece(Type type, int32 val) : type_(type), i32_(val) {}
+
+ // For numeric conversion between
+ // int32, int64, uint32, uint64, double, float and bool
+ template <typename To>
+ util::StatusOr<To> GenericConvert() const;
+
+ // For conversion from string to
+ // int32, int64, uint32, uint64, double, float and bool
+ template <typename To>
+ util::StatusOr<To> StringToNumber(bool (*func)(StringPiece, To*)) const;
+
+ // Data type for this piece of data.
+ Type type_;
+
+ // StringPiece is not a POD and can not be used in an union (pre C++11). We
+ // need a POD version of it.
+ struct StringPiecePod {
+ const char* data;
+ int size;
+
+ // Create from a StringPiece.
+ static StringPiecePod CreateFromStringPiece(StringPiece str) {
+ StringPiecePod pod;
+ pod.data = str.data();
+ pod.size = str.size();
+ return pod;
+ }
+
+ // Cast to StringPiece.
+ operator StringPiece() const { return StringPiece(data, size); }
+
+ bool operator==(const char* value) const {
+ return StringPiece(data, size) == StringPiece(value);
+ }
+
+ string ToString() const { return string(data, size); }
+ };
+
+ // Stored piece of data.
+ union {
+ int32 i32_;
+ int64 i64_;
+ uint32 u32_;
+ uint64 u64_;
+ double double_;
+ float float_;
+ bool bool_;
+ StringPiecePod str_;
+ };
+};
+
+} // namespace converter
+} // namespace util
+} // namespace protobuf
+
+} // namespace google
+#endif // GOOGLE_PROTOBUF_UTIL_CONVERTER_DATAPIECE_H__