#ifndef INCLUDED_ARENA_H
#define INCLUDED_ARENA_H

#ifndef INCLUDED_OS_TYPES_H
#include <os_types.h>
#endif /*INCLUDED_OS_TYPES_H*/

/* ------------------------------------------------------------------------------------------------------------------ */
/*  https://www.gingerbill.org/article/2019/02/08/memory-allocation-strategies-002/  */

typedef struct arena_t{
    uint8_t * buf;
    os_size_t buf_size;
    os_size_t prev_offset;
    os_size_t curr_offset;
}arena_t;

typedef struct arena_temp_memory_t {
    arena_t *arena;
    size_t prev_offset;
    size_t curr_offset;
}arena_temp_memory_t;


/* ------------------------------------------------------------------------------------------------------------------ */
/*  */

void arena_init(arena_t* self, uint8_t * buf, os_size_t buf_size);

void* arena_alloc(arena_t* self, os_size_t size);

void* arena_realloc(arena_t* self, void* old, os_size_t old_size, os_size_t new_size);

// 不支持的操作
//void arena_free(arena_t* self, void* ptr);

void arean_destroy(arena_t* self);

/* ------------------------------------------------------------------------------------------------------------------ */
/*  */

arena_temp_memory_t arena_temp_memory_begin(arena_t *a);

void arena_temp_memory_end(arena_temp_memory_t temp);

#endif /*INCLUDED_ARENA_H*/