chore: import upstream snapshot with attribution

components/esp_blockdev_util/include/esp_blockdev/memory.h

@@ -0,0 +1,51 @@
+/*
+ * SPDX-FileCopyrightText: 2025-2026 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#include "esp_blockdev.h"
+#include "esp_err.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Create a memory-backed block device that wraps an existing buffer
+ *
+ * @param buffer Pointer to the storage backing the device
+ * @param buffer_size Size of the storage buffer in bytes
+ * @param geometry Desired geometry for the device; geometry->disk_size must not exceed buffer_size
+ * @param read_only Set true to disallow write/erase operations on the mapped memory
+ * @param out Output pointer that receives the created block device handle; unchanged on failure
+ *
+ * @return ESP_ERR_INVALID_ARG Invalid argument provided
+ * @return ESP_ERR_INVALID_SIZE Provided buffer or geometry is incompatible
+ * @return ESP_ERR_NO_MEM Memory allocation for device descriptor failed
+ * @return ESP_OK on success
+ */
+esp_err_t esp_blockdev_memory_get_from_buffer(uint8_t *buffer, size_t buffer_size, const esp_blockdev_geometry_t *geometry, bool read_only, esp_blockdev_handle_t *out);
+
+/**
+ * @brief Create a memory-backed block device with internally allocated storage
+ *
+ * @param geometry Desired geometry for the device; geometry->disk_size determines the allocation size
+ * @param caps Heap capability flags passed to heap_caps_malloc
+ * @param out Output pointer that receives the created block device handle; unchanged on failure
+ *
+ * @return ESP_ERR_INVALID_ARG Invalid argument provided
+ * @return ESP_ERR_INVALID_SIZE Allocation size exceeds supported limits
+ * @return ESP_ERR_NO_MEM Memory allocation failed
+ * @return ESP_OK on success
+ */
+esp_err_t esp_blockdev_memory_create_with_heap_caps(const esp_blockdev_geometry_t *geometry, uint32_t caps, esp_blockdev_handle_t *out);
+
+#ifdef __cplusplus
+}
+#endif