Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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59 lines
1.7 KiB
59 lines
1.7 KiB
// Protocol Buffers - Google's data interchange format |
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// Copyright 2023 Google LLC. All rights reserved. |
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// |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file or at |
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// https://developers.google.com/open-source/licenses/bsd |
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#ifndef UPB_LEX_UNICODE_H_ |
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#define UPB_LEX_UNICODE_H_ |
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#include <stdint.h> |
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// Must be last. |
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#include "upb/port/def.inc" |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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// Returns true iff a codepoint is the value for a high surrogate. |
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UPB_INLINE bool upb_Unicode_IsHigh(uint32_t cp) { |
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return (cp >= 0xd800 && cp <= 0xdbff); |
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} |
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// Returns true iff a codepoint is the value for a low surrogate. |
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UPB_INLINE bool upb_Unicode_IsLow(uint32_t cp) { |
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return (cp >= 0xdc00 && cp <= 0xdfff); |
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} |
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// Returns the high 16-bit surrogate value for a supplementary codepoint. |
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// Does not sanity-check the input. |
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UPB_INLINE uint16_t upb_Unicode_ToHigh(uint32_t cp) { |
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return (cp >> 10) + 0xd7c0; |
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} |
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// Returns the low 16-bit surrogate value for a supplementary codepoint. |
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// Does not sanity-check the input. |
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UPB_INLINE uint16_t upb_Unicode_ToLow(uint32_t cp) { |
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return (cp & 0x3ff) | 0xdc00; |
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} |
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// Returns the 32-bit value corresponding to a pair of 16-bit surrogates. |
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// Does not sanity-check the input. |
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UPB_INLINE uint32_t upb_Unicode_FromPair(uint32_t high, uint32_t low) { |
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return ((high & 0x3ff) << 10) + (low & 0x3ff) + 0x10000; |
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} |
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// Outputs a codepoint as UTF8. |
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// Returns the number of bytes written (1-4 on success, 0 on error). |
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// Does not sanity-check the input. Specifically does not check for surrogates. |
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int upb_Unicode_ToUTF8(uint32_t cp, char* out); |
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#ifdef __cplusplus |
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} /* extern "C" */ |
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#endif |
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#include "upb/port/undef.inc" |
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#endif /* UPB_LEX_UNICODE_H_ */
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