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// 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
//
// https://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 "y_absl/strings/internal/utf8.h"
namespace y_absl {
Y_ABSL_NAMESPACE_BEGIN
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] = static_cast<char>(0x80 | (utf8_char & 0x3F));
utf8_char >>= 6;
buffer[0] = static_cast<char>(0xC0 | utf8_char);
return 2;
} else if (utf8_char <= 0xFFFF) {
buffer[2] = static_cast<char>(0x80 | (utf8_char & 0x3F));
utf8_char >>= 6;
buffer[1] = static_cast<char>(0x80 | (utf8_char & 0x3F));
utf8_char >>= 6;
buffer[0] = static_cast<char>(0xE0 | utf8_char);
return 3;
} else {
buffer[3] = static_cast<char>(0x80 | (utf8_char & 0x3F));
utf8_char >>= 6;
buffer[2] = static_cast<char>(0x80 | (utf8_char & 0x3F));
utf8_char >>= 6;
buffer[1] = static_cast<char>(0x80 | (utf8_char & 0x3F));
utf8_char >>= 6;
buffer[0] = static_cast<char>(0xF0 | utf8_char);
return 4;
}
}
} // namespace strings_internal
Y_ABSL_NAMESPACE_END
} // namespace y_absl
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