| // 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. |
| |
| #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 |