Abseil Common Libraries (C++) (grcp 依赖)
https://abseil.io/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
51 lines
1.5 KiB
51 lines
1.5 KiB
// 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
|
|
|