Protocol Buffers - Google's data interchange format (grpc依赖) https://developers.google.com/protocol-buffers/
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/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2011 Google Inc. See LICENSE for details.
* Author: Josh Haberman <jhaberman@gmail.com>
*
* upb's core components like upb_decoder and upb_msg are carefully designed to
* avoid depending on each other for maximum orthogonality. In other words,
* you can use a upb_decoder to decode into *any* kind of structure; upb_msg is
* just one such structure. A upb_msg can be serialized/deserialized into any
* format, protobuf binary format is just one such format.
*
* However, for convenience we provide functions here for doing common
* operations like deserializing protobuf binary format into a upb_msg. The
* compromise is that this file drags in almost all of upb as a dependency,
* which could be undesirable if you're trying to use a trimmed-down build of
* upb.
*
* While these routines are convenient, they do not reuse any encoding/decoding
* state. For example, if a decoder is JIT-based, it will be re-JITted every
* time these functions are called. For this reason, if you are parsing lots
* of data and efficiency is an issue, these may not be the best functions to
* use (though they are useful for prototyping, before optimizing).
*/
#ifndef UPB_GLUE_H
#define UPB_GLUE_H
#include <stdbool.h>
#include "upb/upb.h"
#ifdef __cplusplus
extern "C" {
#endif
// Forward-declares so we don't have to include everything in this .h file.
// Clients should use the regular, typedef'd names (eg. upb_string).
struct _upb_msg;
struct _upb_msgdef;
struct _upb_symtab;
// Decodes the given string, which must be in protobuf binary format, to the
// given upb_msg with msgdef "md", storing the status of the operation in "s".
void upb_strtomsg(const char *str, size_t len, void *msg,
struct _upb_msgdef *md, upb_status *s);
//void upb_msgtotext(struct _upb_string *str, void *msg,
// struct _upb_msgdef *md, bool single_line);
upb_def **upb_load_descriptor(const char *str, size_t len, int *n,
upb_status *status);
void upb_read_descriptor(struct _upb_symtab *symtab, const char *str, size_t len,
upb_status *status);
void upb_read_descriptorfile(struct _upb_symtab *symtab, const char *fname,
upb_status *status);
char *upb_readfile(const char *filename, size_t *len);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif