| // 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 |
| // |
| // http://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_ |
