bootutil_public: added hook for fetch image swap state

/*

 * SPDX-License-Identifier: Apache-2.0

 *

 * Copyright (c) 2021 Nordic Semiconductor ASA

 *

 * Original license:

 *

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *  http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing,

 * software distributed under the License is distributed on an

 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

 * KIND, either express or implied.  See the License for the

 * specific language governing permissions and limitations

 * under the License.

 */

/**

 * @file

 * @brief Hooks definition implementation API

 *

 * This file contains API interface definition for hooks which can be

 * implemented for overide some of MCUboot's native routines.

 */

#ifndef H_BOOTUTIL_PUBLIC_HOOKS

#define H_BOOTUTIL_PUBLIC_HOOKS

#include "bootutil/boot_hooks.h"

/** Hook for provide primary image swap state.

 *

 * @param img_index the index of the image pair

 * @param state image swap state structure to be populated

 *

 * @retval 0: header was read/populated

 *         FIH_FAILURE: image is invalid,

 *         BOOT_HOOK_REGULAR if hook not implemented for the image-slot,

 *         othervise an error-code value.

 */

int boot_read_swap_state_primary_slot_hook(int image_index,

                                           struct boot_swap_state *state);

#endif /*H_BOOTUTIL_PUBLIC_HOOKS*/

#include "bootutil/enc_key_public.h"

#endif

#include "bootutil/boot_public_hooks.h"

#ifdef CONFIG_MCUBOOT

BOOT_LOG_MODULE_DECLARE(mcuboot);

#else

    int rc;

    size_t i;

    rc = BOOT_HOOK_CALL(boot_read_swap_state_primary_slot_hook,

                        BOOT_HOOK_REGULAR, image_index, &primary_slot);

    if (rc == BOOT_HOOK_REGULAR)

    {

        rc = boot_read_swap_state_by_id(FLASH_AREA_IMAGE_PRIMARY(image_index),

                                        &primary_slot);

    }

    if (rc) {

        return BOOT_SWAP_TYPE_PANIC;

    }