Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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78 lines
2.2 KiB
78 lines
2.2 KiB
6 years ago
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/*
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** Functions for use by generated code. These are not public and users must
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** not call them directly.
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*/
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#ifndef UPB_GENERATED_UTIL_H_
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#define UPB_GENERATED_UTIL_H_
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#include <stdint.h>
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#include "upb/structs.int.h"
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#define PTR_AT(msg, ofs, type) (type*)((const char*)msg + ofs)
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UPB_INLINE const void *_upb_array_accessor(const void *msg, size_t ofs,
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size_t *size) {
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const upb_array *arr = *PTR_AT(msg, ofs, const upb_array*);
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if (arr) {
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if (size) *size = arr->size;
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return arr->data;
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} else {
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if (size) *size = 0;
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return NULL;
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}
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}
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UPB_INLINE void *_upb_array_mutable_accessor(void *msg, size_t ofs,
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size_t *size) {
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upb_array *arr = *PTR_AT(msg, ofs, upb_array*);
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if (arr) {
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if (size) *size = arr->size;
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return arr->data;
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} else {
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if (size) size = 0;
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return NULL;
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}
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}
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/* TODO(haberman): this is a mess. It will improve when upb_array no longer
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* carries reflective state (type, elem_size). */
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UPB_INLINE void *_upb_array_resize_accessor(void *msg, size_t ofs, size_t size,
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size_t elem_size,
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upb_fieldtype_t type,
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upb_arena *arena) {
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upb_array *arr = *PTR_AT(msg, ofs, upb_array*);
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if (!arr) {
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arr = upb_array_new(type, arena);
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if (!arr) return NULL;
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}
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if (size > arr->size) {
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size_t new_size = UPB_MAX(arr->size, 4);
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size_t old_bytes = arr->size * elem_size;
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size_t new_bytes;
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upb_alloc *alloc = upb_arena_alloc(arr->arena);
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while (new_size < size) new_size *= 2;
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new_bytes = new_size * elem_size;
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arr->data = upb_realloc(alloc, arr->data, old_bytes, new_bytes);
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if (!arr->data) {
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return NULL;
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}
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arr->size = new_size;
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}
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arr->len = size;
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return arr->data;
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}
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UPB_INLINE bool _upb_has_field(const void *msg, size_t idx) {
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return (*PTR_AT(msg, idx / 8, const char) & (idx % 8)) != 0;
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}
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UPB_INLINE bool _upb_has_oneof_field(const void *msg, size_t case_ofs, int32_t num) {
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return *PTR_AT(msg, case_ofs, int32_t) == num;
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}
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#undef PTR_AT
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#endif /* UPB_GENERATED_UTIL_H_ */
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