1 // Copyright 2017 The Abseil Authors.
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
7 // https://www.apache.org/licenses/LICENSE-2.0
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
15 // UTF8 utilities, implemented to reduce dependencies.
17 #ifndef ABSL_STRINGS_INTERNAL_UTF8_H_
18 #define ABSL_STRINGS_INTERNAL_UTF8_H_
24 namespace strings_internal {
26 // For Unicode code points 0 through 0x10FFFF, EncodeUTF8Char writes
27 // out the UTF-8 encoding into buffer, and returns the number of chars
30 // As described in https://tools.ietf.org/html/rfc3629#section-3 , the encodings
33 // 80 - 7FF : 110xxxxx 10xxxxxx
34 // 800 - FFFF : 1110xxxx 10xxxxxx 10xxxxxx
35 // 10000 - 10FFFF : 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
37 // Values greater than 0x10FFFF are not supported and may or may not write
38 // characters into buffer, however never will more than kMaxEncodedUTF8Size
39 // bytes be written, regardless of the value of utf8_char.
40 enum { kMaxEncodedUTF8Size = 4 };
41 size_t EncodeUTF8Char(char *buffer, char32_t utf8_char);
43 } // namespace strings_internal
46 #endif // ABSL_STRINGS_INTERNAL_UTF8_H_