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)
  
  #include <google/protobuf/stubs/common.h>
  
  #include <atomic>
  #include <errno.h>
  #include <sstream>
  #include <stdio.h>
  #include <vector>
  
  #ifdef _WIN32
  #ifndef WIN32_LEAN_AND_MEAN
  #define WIN32_LEAN_AND_MEAN  // We only need minimal includes
  #endif
  #include <windows.h>
  #define snprintf _snprintf    // see comment in strutil.cc
  #endif
  #if defined(__ANDROID__)
  #include <android/log.h>
  #endif
  
  #include <google/protobuf/stubs/callback.h>
  #include <google/protobuf/stubs/logging.h>
  #include <google/protobuf/stubs/once.h>
  #include <google/protobuf/stubs/status.h>
  #include <google/protobuf/stubs/stringpiece.h>
  #include <google/protobuf/stubs/strutil.h>
  #include <google/protobuf/stubs/int128.h>
  
  #include <google/protobuf/port_def.inc>
  
  namespace google {
  namespace protobuf {
  
  namespace internal {
  
  void VerifyVersion(int headerVersion,
                     int minLibraryVersion,
                     const char* filename) {
    if (GOOGLE_PROTOBUF_VERSION < minLibraryVersion) {
      // Library is too old for headers.
      GOOGLE_LOG(FATAL)
        << "This program requires version " << VersionString(minLibraryVersion)
        << " of the Protocol Buffer runtime library, but the installed version "
           "is " << VersionString(GOOGLE_PROTOBUF_VERSION) << ".  Please update "
           "your library.  If you compiled the program yourself, make sure that "
           "your headers are from the same version of Protocol Buffers as your "
           "link-time library.  (Version verification failed in \""
        << filename << "\".)";
    }
    if (headerVersion < kMinHeaderVersionForLibrary) {
      // Headers are too old for library.
      GOOGLE_LOG(FATAL)
        << "This program was compiled against version "
        << VersionString(headerVersion) << " of the Protocol Buffer runtime "
           "library, which is not compatible with the installed version ("
        << VersionString(GOOGLE_PROTOBUF_VERSION) <<  ").  Contact the program "
           "author for an update.  If you compiled the program yourself, make "
           "sure that your headers are from the same version of Protocol Buffers "
           "as your link-time library.  (Version verification failed in \""
        << filename << "\".)";
    }
  }
  
  std::string VersionString(int version) {
    int major = version / 1000000;
    int minor = (version / 1000) % 1000;
    int micro = version % 1000;
  
    // 128 bytes should always be enough, but we use snprintf() anyway to be
    // safe.
    char buffer[128];
    snprintf(buffer, sizeof(buffer), "%d.%d.%d", major, minor, micro);
  
    // Guard against broken MSVC snprintf().
    buffer[sizeof(buffer)-1] = '\0';
  
    return buffer;
  }
  
  }  // namespace internal
  
  // ===================================================================
  // emulates google3/base/logging.cc
  
  // If the minimum logging level is not set, we default to logging messages for
  // all levels.
  #ifndef GOOGLE_PROTOBUF_MIN_LOG_LEVEL
  #define GOOGLE_PROTOBUF_MIN_LOG_LEVEL LOGLEVEL_INFO
  #endif
  
  namespace internal {
  
  #if defined(__ANDROID__)
  inline void DefaultLogHandler(LogLevel level, const char* filename, int line,
                                const std::string& message) {
    if (level < GOOGLE_PROTOBUF_MIN_LOG_LEVEL) {
      return;
    }
    static const char* level_names[] = {"INFO", "WARNING", "ERROR", "FATAL"};
  
    static const int android_log_levels[] = {
        ANDROID_LOG_INFO,   // LOG(INFO),
        ANDROID_LOG_WARN,   // LOG(WARNING)
        ANDROID_LOG_ERROR,  // LOG(ERROR)
        ANDROID_LOG_FATAL,  // LOG(FATAL)
    };
  
    // Bound the logging level.
    const int android_log_level = android_log_levels[level];
    ::std::ostringstream ostr;
    ostr << "[libprotobuf " << level_names[level] << " " << filename << ":"
         << line << "] " << message.c_str();
  
    // Output the log string the Android log at the appropriate level.
    __android_log_write(android_log_level, "libprotobuf-native",
                        ostr.str().c_str());
    // Also output to std::cerr.
    fprintf(stderr, "%s", ostr.str().c_str());
    fflush(stderr);
  
    // Indicate termination if needed.
    if (android_log_level == ANDROID_LOG_FATAL) {
      __android_log_write(ANDROID_LOG_FATAL, "libprotobuf-native",
                          "terminating.\n");
    }
  }
  
  #else
  void DefaultLogHandler(LogLevel level, const char* filename, int line,
                         const std::string& message) {
    if (level < GOOGLE_PROTOBUF_MIN_LOG_LEVEL) {
      return;
    }
    static const char* level_names[] = { "INFO", "WARNING", "ERROR", "FATAL" };
  
    // We use fprintf() instead of cerr because we want this to work at static
    // initialization time.
    fprintf(stderr, "[libprotobuf %s %s:%d] %s\n",
            level_names[level], filename, line, message.c_str());
    fflush(stderr);  // Needed on MSVC.
  }
  #endif
  
  void NullLogHandler(LogLevel /* level */, const char* /* filename */,
                      int /* line */, const std::string& /* message */) {
    // Nothing.
  }
  
  static LogHandler* log_handler_ = &DefaultLogHandler;
  static std::atomic<int> log_silencer_count_ = ATOMIC_VAR_INIT(0);
  
  LogMessage& LogMessage::operator<<(const std::string& value) {
    message_ += value;
    return *this;
  }
  
  LogMessage& LogMessage::operator<<(const char* value) {
    message_ += value;
    return *this;
  }
  
  LogMessage& LogMessage::operator<<(const StringPiece& value) {
    message_ += value.ToString();
    return *this;
  }
  
  LogMessage& LogMessage::operator<<(const util::Status& status) {
    message_ += status.ToString();
    return *this;
  }
  
  LogMessage& LogMessage::operator<<(const uint128& value) {
    std::ostringstream str;
    str << value;
    message_ += str.str();
    return *this;
  }
  
  LogMessage& LogMessage::operator<<(char value) {
    return *this << StringPiece(&value, 1);
  }
  
  LogMessage& LogMessage::operator<<(void* value) {
    StrAppend(&message_, strings::Hex(reinterpret_cast<uintptr_t>(value)));
    return *this;
  }
  
  #undef DECLARE_STREAM_OPERATOR
  #define DECLARE_STREAM_OPERATOR(TYPE)              \
    LogMessage& LogMessage::operator<<(TYPE value) { \
      StrAppend(&message_, value);                   \
      return *this;                                  \
    }
  
  DECLARE_STREAM_OPERATOR(int)
  DECLARE_STREAM_OPERATOR(unsigned int)
  DECLARE_STREAM_OPERATOR(long)           // NOLINT(runtime/int)
  DECLARE_STREAM_OPERATOR(unsigned long)  // NOLINT(runtime/int)
  DECLARE_STREAM_OPERATOR(double)
  DECLARE_STREAM_OPERATOR(long long)           // NOLINT(runtime/int)
  DECLARE_STREAM_OPERATOR(unsigned long long)  // NOLINT(runtime/int)
  #undef DECLARE_STREAM_OPERATOR
  
  LogMessage::LogMessage(LogLevel level, const char* filename, int line)
    : level_(level), filename_(filename), line_(line) {}
  LogMessage::~LogMessage() {}
  
  void LogMessage::Finish() {
    bool suppress = false;
  
    if (level_ != LOGLEVEL_FATAL) {
      suppress = log_silencer_count_ > 0;
    }
  
    if (!suppress) {
      log_handler_(level_, filename_, line_, message_);
    }
  
    if (level_ == LOGLEVEL_FATAL) {
  #if PROTOBUF_USE_EXCEPTIONS
      throw FatalException(filename_, line_, message_);
  #else
      abort();
  #endif
    }
  }
  
  void LogFinisher::operator=(LogMessage& other) {
    other.Finish();
  }
  
  }  // namespace internal
  
  LogHandler* SetLogHandler(LogHandler* new_func) {
    LogHandler* old = internal::log_handler_;
    if (old == &internal::NullLogHandler) {
      old = nullptr;
    }
    if (new_func == nullptr) {
      internal::log_handler_ = &internal::NullLogHandler;
    } else {
      internal::log_handler_ = new_func;
    }
    return old;
  }
  
  LogSilencer::LogSilencer() {
    ++internal::log_silencer_count_;
  };
  
  LogSilencer::~LogSilencer() {
    --internal::log_silencer_count_;
  };
  
  // ===================================================================
  // emulates google3/base/callback.cc
  
  Closure::~Closure() {}
  
  namespace internal { FunctionClosure0::~FunctionClosure0() {} }
  
  void DoNothing() {}
  
  // ===================================================================
  // emulates google3/util/endian/endian.h
  //
  // TODO(xiaofeng): PROTOBUF_LITTLE_ENDIAN is unfortunately defined in
  // google/protobuf/io/coded_stream.h and therefore can not be used here.
  // Maybe move that macro definition here in the future.
  uint32 ghtonl(uint32 x) {
    union {
      uint32 result;
      uint8 result_array[4];
    };
    result_array[0] = static_cast<uint8>(x >> 24);
    result_array[1] = static_cast<uint8>((x >> 16) & 0xFF);
    result_array[2] = static_cast<uint8>((x >> 8) & 0xFF);
    result_array[3] = static_cast<uint8>(x & 0xFF);
    return result;
  }
  
  #if PROTOBUF_USE_EXCEPTIONS
  FatalException::~FatalException() throw() {}
  
  const char* FatalException::what() const throw() {
    return message_.c_str();
  }
  #endif
  
  }  // namespace protobuf
  }  // namespace google
  
  #include <google/protobuf/port_undef.inc>
  