| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546 | // 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.#ifndef ABSL_STRINGS_INTERNAL_UTF8_H_#define ABSL_STRINGS_INTERNAL_UTF8_H_#include <cstddef>#include <cstdint>namespace absl {namespace strings_internal {// For Unicode code points 0 through 0x10FFFF, EncodeUTF8Char writes// out the UTF-8 encoding into buffer, and returns the number of chars// it wrote.//// As described in https://tools.ietf.org/html/rfc3629#section-3 , the encodings// are://    00 -     7F : 0xxxxxxx//    80 -    7FF : 110xxxxx 10xxxxxx//   800 -   FFFF : 1110xxxx 10xxxxxx 10xxxxxx// 10000 - 10FFFF : 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx//// Values greater than 0x10FFFF are not supported and may or may not write// characters into buffer, however never will more than kMaxEncodedUTF8Size// bytes be written, regardless of the value of utf8_char.enum { kMaxEncodedUTF8Size = 4 };size_t EncodeUTF8Char(char *buffer, char32_t utf8_char);}  // namespace strings_internal}  // namespace absl#endif  // ABSL_STRINGS_INTERNAL_UTF8_H_
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