Abseil Common Libraries (C++) (grcp 依赖)
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50 lines
1.7 KiB
50 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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// |
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// UTF8 utilities, implemented to reduce dependencies. |
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#ifndef ABSL_STRINGS_INTERNAL_UTF8_H_ |
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#define ABSL_STRINGS_INTERNAL_UTF8_H_ |
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#include <cstddef> |
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#include <cstdint> |
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#include "absl/base/config.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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// For Unicode code points 0 through 0x10FFFF, EncodeUTF8Char writes |
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// out the UTF-8 encoding into buffer, and returns the number of chars |
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// it wrote. |
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// |
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// As described in https://tools.ietf.org/html/rfc3629#section-3 , the encodings |
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// are: |
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// 00 - 7F : 0xxxxxxx |
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// 80 - 7FF : 110xxxxx 10xxxxxx |
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// 800 - FFFF : 1110xxxx 10xxxxxx 10xxxxxx |
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// 10000 - 10FFFF : 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx |
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// |
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// Values greater than 0x10FFFF are not supported and may or may not write |
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// characters into buffer, however never will more than kMaxEncodedUTF8Size |
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// bytes be written, regardless of the value of utf8_char. |
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enum { kMaxEncodedUTF8Size = 4 }; |
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size_t EncodeUTF8Char(char *buffer, char32_t utf8_char); |
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} // namespace strings_internal |
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ABSL_NAMESPACE_END |
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} // namespace absl |
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#endif // ABSL_STRINGS_INTERNAL_UTF8_H_
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