Abseil Common Libraries (C++) (grcp 依赖)
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53 lines
1.7 KiB
53 lines
1.7 KiB
// Copyright 2017 The Abseil Authors. |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// https://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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// UTF8 utilities, implemented to reduce dependencies. |
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#include "absl/strings/internal/utf8.h" |
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namespace absl { |
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ABSL_NAMESPACE_BEGIN |
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namespace strings_internal { |
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size_t EncodeUTF8Char(char *buffer, char32_t utf8_char) { |
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if (utf8_char <= 0x7F) { |
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*buffer = static_cast<char>(utf8_char); |
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return 1; |
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} else if (utf8_char <= 0x7FF) { |
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buffer[1] = static_cast<char>(0x80 | (utf8_char & 0x3F)); |
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utf8_char >>= 6; |
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buffer[0] = static_cast<char>(0xC0 | utf8_char); |
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return 2; |
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} else if (utf8_char <= 0xFFFF) { |
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buffer[2] = static_cast<char>(0x80 | (utf8_char & 0x3F)); |
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utf8_char >>= 6; |
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buffer[1] = static_cast<char>(0x80 | (utf8_char & 0x3F)); |
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utf8_char >>= 6; |
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buffer[0] = static_cast<char>(0xE0 | utf8_char); |
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return 3; |
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} else { |
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buffer[3] = static_cast<char>(0x80 | (utf8_char & 0x3F)); |
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utf8_char >>= 6; |
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buffer[2] = static_cast<char>(0x80 | (utf8_char & 0x3F)); |
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utf8_char >>= 6; |
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buffer[1] = static_cast<char>(0x80 | (utf8_char & 0x3F)); |
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utf8_char >>= 6; |
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buffer[0] = static_cast<char>(0xF0 | utf8_char); |
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return 4; |
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} |
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} |
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} // namespace strings_internal |
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ABSL_NAMESPACE_END |
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} // namespace absl
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