text: // Copyright 2017 The Abseil Authors.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //      https://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  // UTF8 utilities, implemented to reduce dependencies.
  
  #include "absl/strings/internal/utf8.h"
  
  namespace absl {
  namespace strings_internal {
  
  size_t EncodeUTF8Char(char *buffer, char32_t utf8_char) {
    if (utf8_char <= 0x7F) {
      *buffer = static_cast<char>(utf8_char);
      return 1;
    } else if (utf8_char <= 0x7FF) {
      buffer[1] = 0x80 | (utf8_char & 0x3F);
      utf8_char >>= 6;
      buffer[0] = 0xC0 | utf8_char;
      return 2;
    } else if (utf8_char <= 0xFFFF) {
      buffer[2] = 0x80 | (utf8_char & 0x3F);
      utf8_char >>= 6;
      buffer[1] = 0x80 | (utf8_char & 0x3F);
      utf8_char >>= 6;
      buffer[0] = 0xE0 | utf8_char;
      return 3;
    } else {
      buffer[3] = 0x80 | (utf8_char & 0x3F);
      utf8_char >>= 6;
      buffer[2] = 0x80 | (utf8_char & 0x3F);
      utf8_char >>= 6;
      buffer[1] = 0x80 | (utf8_char & 0x3F);
      utf8_char >>= 6;
      buffer[0] = 0xF0 | utf8_char;
      return 4;
    }
  }
  
  }  // namespace strings_internal
  }  // namespace absl
  