Protocol Buffers - Google's data interchange format (grpc依赖) https://developers.google.com/protocol-buffers/
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/*
* Copyright (c) 2009-2011, Google LLC
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Google LLC nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL Google LLC BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Public APIs for message operations that do not require descriptors.
* These functions can be used even in build that does not want to depend on
* reflection or descriptors.
*
* Descriptor-based reflection functionality lives in reflection.h.
*/
#ifndef UPB_MSG_H_
#define UPB_MSG_H_
#include <stddef.h>
#include "upb/upb.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef void upb_msg;
/* For users these are opaque. They can be obtained from upb_msgdef_layout()
* but users cannot access any of the members. */
struct upb_msglayout;
typedef struct upb_msglayout upb_msglayout;
/* Adds unknown data (serialized protobuf data) to the given message. The data
* is copied into the message instance. */
void upb_msg_addunknown(upb_msg *msg, const char *data, size_t len,
upb_arena *arena);
/* Returns a reference to the message's unknown data. */
const char *upb_msg_getunknown(const upb_msg *msg, size_t *len);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* UPB_MSG_INT_H_ */