Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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63 lines
1.7 KiB
63 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_MINI_DESCRIPTOR_INTERNAL_BASE92_H_ |
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#define UPB_MINI_DESCRIPTOR_INTERNAL_BASE92_H_ |
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#include <stdint.h> |
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#include "upb/base/internal/log2.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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UPB_INLINE char _upb_ToBase92(int8_t ch) { |
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extern const char _kUpb_ToBase92[]; |
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UPB_ASSERT(0 <= ch && ch < 92); |
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return _kUpb_ToBase92[ch]; |
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} |
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UPB_INLINE char _upb_FromBase92(uint8_t ch) { |
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extern const int8_t _kUpb_FromBase92[]; |
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if (' ' > ch || ch > '~') return -1; |
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return _kUpb_FromBase92[ch - ' ']; |
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} |
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UPB_INLINE const char* _upb_Base92_DecodeVarint(const char* ptr, |
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const char* end, char first_ch, |
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uint8_t min, uint8_t max, |
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uint32_t* out_val) { |
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uint32_t val = 0; |
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uint32_t shift = 0; |
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const int bits_per_char = |
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upb_Log2Ceiling(_upb_FromBase92(max) - _upb_FromBase92(min)); |
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char ch = first_ch; |
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while (1) { |
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uint32_t bits = _upb_FromBase92(ch) - _upb_FromBase92(min); |
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val |= bits << shift; |
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if (ptr == end || *ptr < min || max < *ptr) { |
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*out_val = val; |
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UPB_ASSUME(ptr != NULL); |
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return ptr; |
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} |
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ch = *ptr++; |
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shift += bits_per_char; |
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if (shift >= 32) return NULL; |
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} |
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} |
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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_MINI_DESCRIPTOR_INTERNAL_BASE92_H_
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