Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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71 lines
2.1 KiB
71 lines
2.1 KiB
/* |
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** Data structures for message tables, used for parsing and serialization. |
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** This are much lighter-weight than full reflection, but they are do not |
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** have enough information to convert to text format, JSON, etc. |
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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_MSG_H_ |
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#define UPB_MSG_H_ |
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#include <stdint.h> |
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#include <string.h> |
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#include "upb/upb.h" |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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typedef void upb_msg; |
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/** upb_msglayout *************************************************************/ |
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/* upb_msglayout represents the memory layout of a given upb_msgdef. The |
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* members are public so generated code can initialize them, but users MUST NOT |
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* read or write any of its members. */ |
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typedef struct { |
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uint32_t number; |
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uint16_t offset; |
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int16_t presence; /* If >0, hasbit_index+1. If <0, oneof_index+1. */ |
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uint16_t submsg_index; /* undefined if descriptortype != MESSAGE or GROUP. */ |
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uint8_t descriptortype; |
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uint8_t label; |
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} upb_msglayout_field; |
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typedef struct upb_msglayout { |
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const struct upb_msglayout *const* submsgs; |
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const upb_msglayout_field *fields; |
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/* Must be aligned to sizeof(void*). Doesn't include internal members like |
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* unknown fields, extension dict, pointer to msglayout, etc. */ |
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uint16_t size; |
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uint16_t field_count; |
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bool extendable; |
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} upb_msglayout; |
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/** Message internal representation *******************************************/ |
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/* Our internal representation for repeated fields. */ |
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typedef struct { |
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upb_fieldtype_t type; |
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void *data; /* Each element is element_size. */ |
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size_t len; /* Measured in elements. */ |
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size_t size; /* Measured in elements. */ |
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upb_arena *arena; |
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} upb_array; |
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upb_msg *upb_msg_new(const upb_msglayout *l, upb_arena *a); |
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upb_msg *upb_msg_new(const upb_msglayout *l, upb_arena *a); |
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void upb_msg_addunknown(upb_msg *msg, const char *data, size_t len, |
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upb_arena *arena); |
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const char *upb_msg_getunknown(const upb_msg *msg, size_t *len); |
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upb_array *upb_array_new(upb_fieldtype_t type, upb_arena *a); |
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#ifdef __cplusplus |
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} /* extern "C" */ |
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#endif |
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#endif /* UPB_MSG_H_ */
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