app_update: Moved app metadata to new component esp_app_format

components/esp_app_format/include/esp_app_desc.h

@@ -0,0 +1,61 @@
+/*
+ * SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include "esp_err.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#define ESP_APP_DESC_MAGIC_WORD (0xABCD5432)  /*!< The magic word for the esp_app_desc structure that is in DROM. */
+
+/**
+ * @brief Description about application.
+ */
+typedef struct {
+    uint32_t magic_word;        /*!< Magic word ESP_APP_DESC_MAGIC_WORD */
+    uint32_t secure_version;    /*!< Secure version */
+    uint32_t reserv1[2];        /*!< reserv1 */
+    char version[32];           /*!< Application version */
+    char project_name[32];      /*!< Project name */
+    char time[16];              /*!< Compile time */
+    char date[16];              /*!< Compile date*/
+    char idf_ver[32];           /*!< Version IDF */
+    uint8_t app_elf_sha256[32]; /*!< sha256 of elf file */
+    uint32_t reserv2[20];       /*!< reserv2 */
+} esp_app_desc_t;
+
+/** @cond */
+_Static_assert(sizeof(esp_app_desc_t) == 256, "esp_app_desc_t should be 256 bytes");
+/** @endcond */
+
+/**
+ * @brief   Return esp_app_desc structure. This structure includes app version.
+ *
+ * Return description for running app.
+ * @return Pointer to esp_app_desc structure.
+ */
+const esp_app_desc_t *esp_app_get_description(void);
+
+/**
+ * @brief   Fill the provided buffer with SHA256 of the ELF file, formatted as hexadecimal, null-terminated.
+ * If the buffer size is not sufficient to fit the entire SHA256 in hex plus a null terminator,
+ * the largest possible number of bytes will be written followed by a null.
+ * @param dst   Destination buffer
+ * @param size  Size of the buffer
+ * @return      Number of bytes written to dst (including null terminator)
+ */
+int esp_app_get_elf_sha256(char* dst, size_t size);
+
+#ifdef __cplusplus
+}
+#endif