1// Copyright 2017 The Abseil Authors.
2//
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
6//
7// https://www.apache.org/licenses/LICENSE-2.0
8//
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.
14
15// UTF8 utilities, implemented to reduce dependencies.
16
17#include "absl/strings/internal/utf8.h"
18
19namespace absl {
20namespace strings_internal {
21
22size_t EncodeUTF8Char(char *buffer, char32_t utf8_char) {
23 if (utf8_char <= 0x7F) {
24 *buffer = static_cast<char>(utf8_char);
25 return 1;
26 } else if (utf8_char <= 0x7FF) {
27 buffer[1] = 0x80 | (utf8_char & 0x3F);
28 utf8_char >>= 6;
29 buffer[0] = 0xC0 | utf8_char;
30 return 2;
31 } else if (utf8_char <= 0xFFFF) {
32 buffer[2] = 0x80 | (utf8_char & 0x3F);
33 utf8_char >>= 6;
34 buffer[1] = 0x80 | (utf8_char & 0x3F);
35 utf8_char >>= 6;
36 buffer[0] = 0xE0 | utf8_char;
37 return 3;
38 } else {
39 buffer[3] = 0x80 | (utf8_char & 0x3F);
40 utf8_char >>= 6;
41 buffer[2] = 0x80 | (utf8_char & 0x3F);
42 utf8_char >>= 6;
43 buffer[1] = 0x80 | (utf8_char & 0x3F);
44 utf8_char >>= 6;
45 buffer[0] = 0xF0 | utf8_char;
46 return 4;
47 }
48}
49
50} // namespace strings_internal
51} // namespace absl
52