1 | /* |
2 | ** Data structures for message tables, used for parsing and serialization. |
3 | ** This are much lighter-weight than full reflection, but they are do not |
4 | ** have enough information to convert to text format, JSON, etc. |
5 | ** |
6 | ** The definitions in this file are internal to upb. |
7 | **/ |
8 | |
9 | #ifndef UPB_MSG_H_ |
10 | #define UPB_MSG_H_ |
11 | |
12 | #include <stdint.h> |
13 | #include <string.h> |
14 | #include "upb/upb.h" |
15 | |
16 | #ifdef __cplusplus |
17 | extern "C" { |
18 | #endif |
19 | |
20 | typedef void upb_msg; |
21 | |
22 | /** upb_msglayout *************************************************************/ |
23 | |
24 | /* upb_msglayout represents the memory layout of a given upb_msgdef. The |
25 | * members are public so generated code can initialize them, but users MUST NOT |
26 | * read or write any of its members. */ |
27 | |
28 | typedef struct { |
29 | uint32_t number; |
30 | uint16_t offset; |
31 | int16_t presence; /* If >0, hasbit_index+1. If <0, oneof_index+1. */ |
32 | uint16_t submsg_index; /* undefined if descriptortype != MESSAGE or GROUP. */ |
33 | uint8_t descriptortype; |
34 | uint8_t label; |
35 | } upb_msglayout_field; |
36 | |
37 | typedef struct upb_msglayout { |
38 | const struct upb_msglayout *const* submsgs; |
39 | const upb_msglayout_field *fields; |
40 | /* Must be aligned to sizeof(void*). Doesn't include internal members like |
41 | * unknown fields, extension dict, pointer to msglayout, etc. */ |
42 | uint16_t size; |
43 | uint16_t field_count; |
44 | bool extendable; |
45 | } upb_msglayout; |
46 | |
47 | /** Message internal representation *******************************************/ |
48 | |
49 | /* Our internal representation for repeated fields. */ |
50 | typedef struct { |
51 | void *data; /* Each element is element_size. */ |
52 | size_t len; /* Measured in elements. */ |
53 | size_t size; /* Measured in elements. */ |
54 | } upb_array; |
55 | |
56 | upb_msg *upb_msg_new(const upb_msglayout *l, upb_arena *a); |
57 | upb_msg *upb_msg_new(const upb_msglayout *l, upb_arena *a); |
58 | |
59 | void upb_msg_addunknown(upb_msg *msg, const char *data, size_t len, |
60 | upb_arena *arena); |
61 | const char *upb_msg_getunknown(const upb_msg *msg, size_t *len); |
62 | |
63 | upb_array *upb_array_new(upb_arena *a); |
64 | |
65 | #ifdef __cplusplus |
66 | } /* extern "C" */ |
67 | #endif |
68 | |
69 | #endif /* UPB_MSG_H_ */ |
70 | |