/*
 * Copyright (c) 2023 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 */

#include <zephyr/llext/buf_loader.h>
#include <zephyr/sys/util.h>
#include <string.h>

int llext_buf_read(struct llext_loader *l, void *buf, size_t len)
{
	struct llext_buf_loader *buf_l = CONTAINER_OF(l, struct llext_buf_loader, loader);
	size_t end = MIN(buf_l->pos + len, buf_l->len);
	size_t read_len = end - buf_l->pos;

	memcpy(buf, buf_l->buf + buf_l->pos, read_len);
	buf_l->pos = end;

	return 0;
}

int llext_buf_seek(struct llext_loader *l, size_t pos)
{
	struct llext_buf_loader *buf_l = CONTAINER_OF(l, struct llext_buf_loader, loader);

	buf_l->pos = MIN(pos, buf_l->len);

	return 0;
}

void *llext_buf_peek(struct llext_loader *l, size_t pos)
{
	struct llext_buf_loader *buf_l = CONTAINER_OF(l, struct llext_buf_loader, loader);

	return (void *)(buf_l->buf + pos);
}