Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
91 lines
3.0 KiB
91 lines
3.0 KiB
// Protocol Buffers - Google's data interchange format |
|
// Copyright 2023 Google LLC. All rights reserved. |
|
// |
|
// Use of this source code is governed by a BSD-style |
|
// license that can be found in the LICENSE file or at |
|
// https://developers.google.com/open-source/licenses/bsd |
|
|
|
/* |
|
** Our memory representation for parsing tables and messages themselves. |
|
** Functions in this file are used by generated code and possibly reflection. |
|
** |
|
** The definitions in this file are internal to upb. |
|
**/ |
|
|
|
#ifndef UPB_MESSAGE_INTERNAL_MESSAGE_H_ |
|
#define UPB_MESSAGE_INTERNAL_MESSAGE_H_ |
|
|
|
#include <stdlib.h> |
|
#include <string.h> |
|
|
|
#include "upb/mem/arena.h" |
|
#include "upb/message/internal/extension.h" |
|
#include "upb/mini_table/internal/types.h" |
|
#include "upb/mini_table/message.h" |
|
|
|
// Must be last. |
|
#include "upb/port/def.inc" |
|
|
|
#ifdef __cplusplus |
|
extern "C" { |
|
#endif |
|
|
|
extern const float kUpb_FltInfinity; |
|
extern const double kUpb_Infinity; |
|
extern const double kUpb_NaN; |
|
|
|
// Internal members of a upb_Message that track unknown fields and/or |
|
// extensions. We can change this without breaking binary compatibility. |
|
|
|
typedef struct upb_Message_Internal { |
|
// Total size of this structure, including the data that follows. |
|
// Must be aligned to 8, which is alignof(upb_Extension) |
|
uint32_t size; |
|
|
|
/* Offsets relative to the beginning of this structure. |
|
* |
|
* Unknown data grows forward from the beginning to unknown_end. |
|
* Extension data grows backward from size to ext_begin. |
|
* When the two meet, we're out of data and have to realloc. |
|
* |
|
* If we imagine that the final member of this struct is: |
|
* char data[size - overhead]; // overhead = sizeof(upb_Message_Internal) |
|
* |
|
* Then we have: |
|
* unknown data: data[0 .. (unknown_end - overhead)] |
|
* extensions data: data[(ext_begin - overhead) .. (size - overhead)] */ |
|
uint32_t unknown_end; |
|
uint32_t ext_begin; |
|
/* Data follows, as if there were an array: |
|
* char data[size - sizeof(upb_Message_Internal)]; */ |
|
} upb_Message_Internal; |
|
|
|
// Inline version upb_Message_New(), for internal use. |
|
UPB_INLINE struct upb_Message* _upb_Message_New(const upb_MiniTable* m, |
|
upb_Arena* a) { |
|
const int size = m->UPB_PRIVATE(size); |
|
struct upb_Message* msg = (struct upb_Message*)upb_Arena_Malloc(a, size); |
|
if (UPB_UNLIKELY(!msg)) return NULL; |
|
memset(msg, 0, size); |
|
return msg; |
|
} |
|
|
|
// Discards the unknown fields for this message only. |
|
void _upb_Message_DiscardUnknown_shallow(struct upb_Message* msg); |
|
|
|
// Adds unknown data (serialized protobuf data) to the given message. |
|
// The data is copied into the message instance. |
|
bool UPB_PRIVATE(_upb_Message_AddUnknown)(struct upb_Message* msg, |
|
const char* data, size_t len, |
|
upb_Arena* arena); |
|
|
|
bool UPB_PRIVATE(_upb_Message_Realloc)(struct upb_Message* msg, size_t need, |
|
upb_Arena* arena); |
|
|
|
#ifdef __cplusplus |
|
} /* extern "C" */ |
|
#endif |
|
|
|
#include "upb/port/undef.inc" |
|
|
|
#endif /* UPB_MESSAGE_INTERNAL_MESSAGE_H_ */
|
|
|