Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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90 lines
3.0 KiB
90 lines
3.0 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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/* |
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** Our memory representation for parsing tables and messages themselves. |
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** Functions in this file are used by generated code and possibly reflection. |
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** |
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** The definitions in this file are internal to upb. |
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**/ |
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#ifndef UPB_MESSAGE_INTERNAL_MESSAGE_H_ |
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#define UPB_MESSAGE_INTERNAL_MESSAGE_H_ |
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#include <stdlib.h> |
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#include <string.h> |
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#include "upb/mem/arena.h" |
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#include "upb/message/internal/extension.h" |
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#include "upb/mini_table/message.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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extern const float kUpb_FltInfinity; |
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extern const double kUpb_Infinity; |
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extern const double kUpb_NaN; |
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// Internal members of a upb_Message that track unknown fields and/or |
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// extensions. We can change this without breaking binary compatibility. |
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typedef struct upb_Message_Internal { |
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// Total size of this structure, including the data that follows. |
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// Must be aligned to 8, which is alignof(upb_Extension) |
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uint32_t size; |
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/* Offsets relative to the beginning of this structure. |
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* |
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* Unknown data grows forward from the beginning to unknown_end. |
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* Extension data grows backward from size to ext_begin. |
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* When the two meet, we're out of data and have to realloc. |
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* |
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* If we imagine that the final member of this struct is: |
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* char data[size - overhead]; // overhead = sizeof(upb_Message_Internal) |
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* |
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* Then we have: |
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* unknown data: data[0 .. (unknown_end - overhead)] |
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* extensions data: data[(ext_begin - overhead) .. (size - overhead)] */ |
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uint32_t unknown_end; |
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uint32_t ext_begin; |
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// Data follows, as if there were an array: |
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// char data[size - sizeof(upb_Message_Internal)]; |
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} upb_Message_Internal; |
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// Inline version upb_Message_New(), for internal use. |
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UPB_INLINE struct upb_Message* _upb_Message_New(const upb_MiniTable* m, |
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upb_Arena* a) { |
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const int size = m->UPB_PRIVATE(size); |
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struct upb_Message* msg = (struct upb_Message*)upb_Arena_Malloc(a, size); |
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if (UPB_UNLIKELY(!msg)) return NULL; |
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memset(msg, 0, size); |
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return msg; |
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} |
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// Discards the unknown fields for this message only. |
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void _upb_Message_DiscardUnknown_shallow(struct upb_Message* msg); |
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// Adds unknown data (serialized protobuf data) to the given message. |
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// The data is copied into the message instance. |
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bool UPB_PRIVATE(_upb_Message_AddUnknown)(struct upb_Message* msg, |
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const char* data, size_t len, |
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upb_Arena* arena); |
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bool UPB_PRIVATE(_upb_Message_Realloc)(struct upb_Message* msg, size_t need, |
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upb_Arena* arena); |
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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_MESSAGE_INTERNAL_MESSAGE_H_ */
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