//
// Created by zemon on 14.07.2022.
//

#include <memory.h>
#include "SimpleIndelibleMalloc.h"

void SimpleIndelibleMalloc_Init(tSimpleIndelibleMalloc *env, uint8_t *buffer, size_t size) {
    env->buffer = buffer;
    env->size = size;
    env->used = 0;
}

void SimpleIndelibleMalloc_Clear(tSimpleIndelibleMalloc *env) {
    memset(env->buffer, 0, env->size);
}

static void *SimpleIndelibleMalloc_Get(tSimpleIndelibleMalloc *env, size_t len) {
    if ((env->used + len) > env->size) {
        return 0;
    }

    void *result = env->buffer + env->used;
    env->used += len;
    return result;
}


static void SimpleIndelibleMalloc_Free(tSimpleIndelibleMalloc *env, void *ptr) {
    //do nothing, it's indelible
}

tMemAllocInterface SimpleIndelibleMalloc_GetInterface(tSimpleIndelibleMalloc *env) {
    return (tMemAllocInterface) {
            .env = env,
            .free = (void *) SimpleIndelibleMalloc_Free,
            .alloc = (void *) SimpleIndelibleMalloc_Get,
    };
}