text: // 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) and others
  //
  // Contains basic types and utilities used by the rest of the library.
  
  #ifndef GOOGLE_PROTOBUF_COMMON_H__
  #define GOOGLE_PROTOBUF_COMMON_H__
  
  #include <algorithm>
  #include <iostream>
  #include <map>
  #include <memory>
  #include <set>
  #include <string>
  #include <vector>
  
  #include <google/protobuf/stubs/macros.h>
  #include <google/protobuf/stubs/platform_macros.h>
  #include <google/protobuf/stubs/port.h>
  #include <google/protobuf/stubs/stringpiece.h>
  
  #ifndef PROTOBUF_USE_EXCEPTIONS
  #if defined(_MSC_VER) && defined(_CPPUNWIND)
    #define PROTOBUF_USE_EXCEPTIONS 1
  #elif defined(__EXCEPTIONS)
    #define PROTOBUF_USE_EXCEPTIONS 1
  #else
    #define PROTOBUF_USE_EXCEPTIONS 0
  #endif
  #endif
  
  #if PROTOBUF_USE_EXCEPTIONS
  #include <exception>
  #endif
  #if defined(__APPLE__)
  #include <TargetConditionals.h>  // for TARGET_OS_IPHONE
  #endif
  
  #if defined(__ANDROID__) || defined(GOOGLE_PROTOBUF_OS_ANDROID) || (defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) || defined(GOOGLE_PROTOBUF_OS_IPHONE)
  #include <pthread.h>
  #endif
  
  #include <google/protobuf/port_def.inc>
  
  namespace std {}
  
  namespace google {
  namespace protobuf {
  namespace internal {
  
  // Some of these constants are macros rather than const ints so that they can
  // be used in #if directives.
  
  // The current version, represented as a single integer to make comparison
  // easier:  major * 10^6 + minor * 10^3 + micro
  #define GOOGLE_PROTOBUF_VERSION 3019003
  
  // A suffix string for alpha, beta or rc releases. Empty for stable releases.
  #define GOOGLE_PROTOBUF_VERSION_SUFFIX ""
  
  // The minimum header version which works with the current version of
  // the library.  This constant should only be used by protoc's C++ code
  // generator.
  static const int kMinHeaderVersionForLibrary = 3019000;
  
  // The minimum protoc version which works with the current version of the
  // headers.
  #define GOOGLE_PROTOBUF_MIN_PROTOC_VERSION 3019000
  
  // The minimum header version which works with the current version of
  // protoc.  This constant should only be used in VerifyVersion().
  static const int kMinHeaderVersionForProtoc = 3019000;
  
  // Verifies that the headers and libraries are compatible.  Use the macro
  // below to call this.
  void PROTOBUF_EXPORT VerifyVersion(int headerVersion, int minLibraryVersion,
                                     const char* filename);
  
  // Converts a numeric version number to a string.
  std::string PROTOBUF_EXPORT VersionString(int version);
  
  }  // namespace internal
  
  // Place this macro in your main() function (or somewhere before you attempt
  // to use the protobuf library) to verify that the version you link against
  // matches the headers you compiled against.  If a version mismatch is
  // detected, the process will abort.
  #define GOOGLE_PROTOBUF_VERIFY_VERSION                                    \
    ::google::protobuf::internal::VerifyVersion(                            \
      GOOGLE_PROTOBUF_VERSION, GOOGLE_PROTOBUF_MIN_LIBRARY_VERSION,         \
      __FILE__)
  
  
  // ===================================================================
  // from google3/util/utf8/public/unilib.h
  
  namespace internal {
  
  // Checks if the buffer contains structurally-valid UTF-8.  Implemented in
  // structurally_valid.cc.
  PROTOBUF_EXPORT bool IsStructurallyValidUTF8(const char* buf, int len);
  
  inline bool IsStructurallyValidUTF8(StringPiece str) {
    return IsStructurallyValidUTF8(str.data(), static_cast<int>(str.length()));
  }
  
  // Returns initial number of bytes of structurally valid UTF-8.
  PROTOBUF_EXPORT int UTF8SpnStructurallyValid(StringPiece str);
  
  // Coerce UTF-8 byte string in src_str to be
  // a structurally-valid equal-length string by selectively
  // overwriting illegal bytes with replace_char (typically ' ' or '?').
  // replace_char must be legal printable 7-bit Ascii 0x20..0x7e.
  // src_str is read-only.
  //
  // Returns pointer to output buffer, src_str.data() if no changes were made,
  //  or idst if some bytes were changed. idst is allocated by the caller
  //  and must be at least as big as src_str
  //
  // Optimized for: all structurally valid and no byte copying is done.
  //
  PROTOBUF_EXPORT char* UTF8CoerceToStructurallyValid(StringPiece str, char* dst,
                                                      char replace_char);
  
  }  // namespace internal
  
  // This lives in message_lite.h now, but we leave this here for any users that
  // #include common.h and not message_lite.h.
  PROTOBUF_EXPORT void ShutdownProtobufLibrary();
  
  namespace internal {
  
  // Strongly references the given variable such that the linker will be forced
  // to pull in this variable's translation unit.
  template <typename T>
  void StrongReference(const T& var) {
    auto volatile unused = &var;
    (void)&unused;  // Use address to avoid an extra load of "unused".
  }
  
  }  // namespace internal
  
  #if PROTOBUF_USE_EXCEPTIONS
  class FatalException : public std::exception {
   public:
    FatalException(const char* filename, int line, const std::string& message)
        : filename_(filename), line_(line), message_(message) {}
    virtual ~FatalException() throw();
  
    const char* what() const throw() override;
  
    const char* filename() const { return filename_; }
    int line() const { return line_; }
    const std::string& message() const { return message_; }
  
   private:
    const char* filename_;
    const int line_;
    const std::string message_;
  };
  #endif
  
  // This is at the end of the file instead of the beginning to work around a bug
  // in some versions of MSVC.
  using std::string;
  
  }  // namespace protobuf
  }  // namespace google
  
  #include <google/protobuf/port_undef.inc>
  
  #endif  // GOOGLE_PROTOBUF_COMMON_H__
  