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/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2009 Joshua Haberman. See LICENSE for details.
*
* This file defines the in-memory format for messages, arrays, and strings
* (which are the three dynamically-allocated structures that make up all
* protobufs). */
#ifndef UPB_STRUCT_H
#define UPB_STRUCT_H
#include "upb.h"
/* mmhead -- this is a "base class" for strings, arrays, and messages ********/
struct upb_mm_ref;
struct upb_mmhead {
struct upb_mm_ref *refs; /* Head of linked list. */
uint32_t refcount;
};
INLINE void upb_mmhead_init(struct upb_mmhead *head) {
head->refs = NULL;
head->refcount = 1;
}
INLINE bool upb_mmhead_norefs(struct upb_mmhead *head) {
return head->refcount == 0 && head->refs == NULL;
}
INLINE bool upb_mmhead_only(struct upb_mmhead *head) {
return head->refcount == 1 && head->refs == NULL;
}
INLINE bool upb_mmhead_unref(struct upb_mmhead *head) {
head->refcount--;
return upb_mmhead_norefs(head);
}
INLINE void upb_mmhead_ref(struct upb_mmhead *head) {
head->refcount++;
}
/* Structures for msg, string, and array. *************************************/
/* These are all self describing. */
struct upb_msgdef;
struct upb_fielddef;
struct upb_msg {
struct upb_mmhead mmhead;
struct upb_msgdef *def;
uint8_t data[1];
};
typedef uint32_t upb_arraylen_t; /* can be at most 2**32 elements long. */
struct upb_array {
struct upb_mmhead mmhead;
struct upb_fielddef *fielddef; /* Defines the type of the array. */
union upb_value_ptr elements;
upb_arraylen_t len; /* Number of elements in "elements". */
upb_arraylen_t size; /* Memory we own. */
};
struct upb_string {
struct upb_mmhead mmhead;
/* We expect the data to be 8-bit clean (uint8_t), but char* is such an
* ingrained convention that we follow it. */
char *ptr;
uint32_t byte_len;
uint32_t byte_size; /* How many bytes of ptr we own, 0 if we reference. */
};
/* Type-specific overlays on upb_array. ***************************************/
#define UPB_DEFINE_ARRAY_TYPE(name, type) \
struct name ## _array { \
struct upb_mmhead mmhead; \
struct upb_fielddef *fielddef; \
type elements; \
upb_arraylen_t len; \
upb_arraylen_t size; \
};
UPB_DEFINE_ARRAY_TYPE(upb_double, double)
UPB_DEFINE_ARRAY_TYPE(upb_float, float)
UPB_DEFINE_ARRAY_TYPE(upb_int32, int32_t)
UPB_DEFINE_ARRAY_TYPE(upb_int64, int64_t)
UPB_DEFINE_ARRAY_TYPE(upb_uint32, uint32_t)
UPB_DEFINE_ARRAY_TYPE(upb_uint64, uint64_t)
UPB_DEFINE_ARRAY_TYPE(upb_bool, bool)
UPB_DEFINE_ARRAY_TYPE(upb_string, struct upb_string*)
UPB_DEFINE_ARRAY_TYPE(upb_msg, void*)
/* Defines an array of a specific message type (an overlay of upb_array). */
#define UPB_MSG_ARRAY(msg_type) struct msg_type ## _array
#define UPB_DEFINE_MSG_ARRAY(msg_type) \
UPB_MSG_ARRAY(msg_type) { \
struct upb_mmhead mmhead; \
struct upb_fielddef *fielddef; \
msg_type **elements; \
upb_arraylen_t len; \
upb_arraylen_t size; \
};
/* mmptr -- a pointer which polymorphically points to one of the above. *******/
union upb_mmptr {
struct upb_msg *msg;
struct upb_array *arr;
struct upb_string *str;
};
enum {
UPB_MM_MSG_REF,
UPB_MM_STR_REF,
UPB_MM_ARR_REF
};
typedef uint8_t upb_mm_ptrtype;
#endif
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