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/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2009 Joshua Haberman. See LICENSE for details.
* Defines an in-memory array type. TODO: more documentation.
*
*/
#ifndef UPB_ARRAY_H_
#define UPB_ARRAY_H_
#ifdef __cplusplus
extern "C" {
#endif
struct upb_string;
#include "upb.h"
/* Represents an array (a repeated field) of any type. The interpretation of
* the data in the array depends on the type. */
struct upb_array {
union upb_value_ptr elements;
uint32_t len; /* Measured in elements. */
};
/* Returns a pointer to an array element. */
INLINE union upb_value_ptr upb_array_getelementptr(
struct upb_array *arr, uint32_t n, upb_field_type_t type)
{
union upb_value_ptr ptr;
ptr._void = (void*)((char*)arr->elements._void + n*upb_type_info[type].size);
return ptr;
}
INLINE union upb_value upb_array_getelement(
struct upb_array *arr, uint32_t n, upb_field_type_t type)
{
return upb_deref(upb_array_getelementptr(arr, n, type), type);
}
/* These are all overlays on upb_array, pointers between them can be cast. */
#define UPB_DEFINE_ARRAY_TYPE(name, type) \
struct name ## _array { \
type *elements; \
uint32_t len; \
};
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. */
#define UPB_MSG_ARRAY(msg_type) struct msg_type ## _array
#define UPB_DEFINE_MSG_ARRAY(msg_type) \
UPB_MSG_ARRAY(msg_type) { \
msg_type **elements; \
uint32_t len; \
};
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif
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