feat: Add a component for parsing external partition tables (MBR)

Author: adokitkat

.build-test-rules.yml

@@ -24,6 +24,11 @@ esp_encrypted_img/examples/pre_encrypted_ota:
     - if: IDF_TARGET in ["esp32", "esp32s3"]
       reason: ESP32 runs RSA OTA encryption test, ESP32-S3 runs ECC OTA encryption test
 
+esp_ext_part_tables/test_apps:
+  enable:
+    - if: ((IDF_VERSION_MAJOR == 5 and IDF_VERSION_MINOR >= 1) or (IDF_VERSION_MAJOR >= 6)) and IDF_TARGET == "linux"
+      reason: Host test is enough
+
 sh2lib/examples/http2_request:
   enable:
     - if: IDF_VERSION_MAJOR > 4 and INCLUDE_DEFAULT == 1

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -31,6 +31,7 @@ body:
         - eigen
         - esp_delta_ota
         - esp_encrypted_img
+        - esp_ext_part_tables
         - esp_gcov
         - esp_jpeg
         - esp_lcd_qemu_rgb

.github/workflows/upload_component.yml

@@ -43,6 +43,7 @@ jobs:
             eigen;
             esp_delta_ota;
             esp_encrypted_img;
+            esp_ext_part_tables;
             esp_gcov;
             esp_lcd_qemu_rgb;
             esp_jpeg;

.idf_build_apps.toml

@@ -10,6 +10,7 @@ manifest_file = [
     "esp_encrypted_img/.build-test-rules.yml",
     "esp_gcov/.build-test-rules.yml",
     "esp_jpeg/.build-test-rules.yml",
+    "esp_ext_part_tables/.build-test-rules.yml",
     "esp_serial_slave_link/.build-test-rules.yml",
     "expat/.build-test-rules.yml",
     "iqmath/.build-test-rules.yml",

esp_ext_part_tables/.build-test-rules.yml

@@ -0,0 +1,4 @@
+esp_ext_part_tables/examples/basic:
+  enable:
+    - if: ((IDF_VERSION_MAJOR == 5 and IDF_VERSION_MINOR >= 1) or (IDF_VERSION_MAJOR >= 6)) and IDF_TARGET == "linux"
+      reason: Host test is enough

esp_ext_part_tables/CMakeLists.txt

@@ -0,0 +1,6 @@
+set(srcs "src/esp_ext_part_tables.c"
+         "src/esp_mbr.c")
+
+idf_component_register(SRCS ${srcs}
+                    INCLUDE_DIRS "include"
+                    REQUIRES "log" "esp_common")

esp_ext_part_tables/LICENSE

@@ -0,0 +1,201 @@
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esp_ext_part_tables/README.md

@@ -0,0 +1,60 @@
+# ESP External Partition Tables
+
+This component provides an API to parse and generate external partition tables.
+
+Currently only [MBR (Master boot record)](https://en.wikipedia.org/wiki/Master_boot_record) is supported.
+
+## Features
+
+- Parse MBR partition tables from raw data (e.g., SD card, USB drive)
+- Generate and manipulate partition lists in memory
+- Deep copy and de-initialize partition lists
+- Access partition information (address, size, type, label)
+- Example projects included
+
+## Example code
+
+```c
+// loaded_mbr -> Pointer to an array of 512 bytes containting MBR loaded from somewhere (SD card, etc.)
+
+#include <stdio.h>
+#include <inttypes.h>
+#include "esp_err.h"
+#include "esp_ext_part_tables.h"
+#include "esp_mbr.h"
+
+esp_err_t err = ESP_OK;
+esp_ext_part_list_t part_list = {0};
+
+err = esp_mbr_parse((void*) loaded_mbr, &part_list, NULL); // Parse the array containing MBR and fill `esp_ext_part_list_t part_list` structure
+if (err != ESP_OK) {
+    return err;
+}
+
+esp_ext_part_list_item_t* item;
+item = esp_ext_part_list_item_head(&part_list); // Get the first partition
+
+for (int i = 0; item != NULL; i++) {
+    printf("Partition %d:\n
+        address: %" PRIu64 "\n
+        size: %" PRIu64 "\n
+        type: %" PRIu32 "\n,
+        label: %s\n",
+    i, item->info.address, item->info.size, (uint32_t) item->info.type, item->label ? item->label : ""); // item->info.type is of `esp_ext_part_type_known_t` enum type
+
+    item = esp_ext_part_list_item_next(item); // Get the next partition
+}
+
+// ...
+
+// Clean up when done
+esp_ext_part_list_deinit(&part_list);
+```
+
+## More Examples
+
+Runnable example projects can be found in [`examples/`](/esp_ext_part_tables/examples/) folder.
+
+## API Reference
+
+See [`esp_ext_part_tables.h`](/esp_ext_part_tables/include/esp_ext_part_tables.h) for the full API documentation.

esp_ext_part_tables/examples/basic/CMakeLists.txt

@@ -0,0 +1,5 @@
+cmake_minimum_required(VERSION 3.16)
+
+set(COMPONENTS main)
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(esp_ext_part_tables_example_basic)

esp_ext_part_tables/examples/basic/README.md

@@ -0,0 +1,66 @@
+# esp_ext_part_tables basic example
+
+This example demonstrates how to use an ESP32 to read and parse the Master Boot Record (MBR) from a (micro)SD card. It shows how to extract and display information about the card's partitions, such as their type, size, and starting sector, using the ESP-IDF framework.
+
+## Requirements
+
+- any ESP32 board which supports SPI with a (micro)SD card slot or breakout board connected
+- formatted (micro)SD card using MBR (not GPT) as a partition table
+
+## Build and Flash
+
+The example runs on any ESP development board with SD card connected via SPI (use `idf.py menuconfig` -> `Example config` to set used GPIO pins). For example, to build and run the code on ESP32-S3, use:
+
+```
+idf.py set-target esp32s3
+idf.py menuconfig
+idf.py build flash monitor
+```
+
+NOTE 1: This example uses SDSPI instead of SDMMC to connect to SD card due to more ESP32 devices supporting it but it doesn't matter which one one you use in your project to load the first sector containing MBR. 
+
+NOTE 2: ESP-IDF 5.1 or newer enviroment must be set properly before running the example.
+
+## Example output
+
+MicroSD card used in the example showcase has capacity 64GiB and was formatted using Windows Disk Management program to two ~32GiB FAT32 partitions as seen in the picture:
+
+![Screenshot of Disk Management Windows program showing removable Disk 0 (a microSD card) containing 2 FAT32 partitions both roughly 30GB is size](/esp_ext_part_tables/examples/basic/assets/two_fat_partitions.png)
+
+The example code parsed the MBR and printed the loaded partition information (`type 4` corresponds to `ESP_EXT_PART_TYPE_FAT32` in `esp_ext_part_type_known_t` enum, etc.). The second task generated MBR from `esp_ext_part_list_t` definition and then parsed it again and printed the output.
+
+```log
+I (275) esp_ext_part_tables_example_basic: Example started
+I (275) esp_ext_part_tables_example_basic: Starting MBR parsing example task
+I (335) esp_ext_part_tables_example_basic: MBR loaded successfully
+I (335) esp_ext_part_tables_example_basic: MBR parsed successfully
+Partition 0:
+        LBA start sector: 2048, address: 1048576,
+        sector count: 59392000, size: 30408704000,
+        type: 4
+
+Partition 1:
+        LBA start sector: 59394048, address: 30409752576,
+        sector count: 62746624, size: 32126271488,
+        type: 4
+
+I (365) esp_ext_part_tables_example_basic: Starting MBR generation example task
+I (365) esp_ext_part_tables_example_basic: MBR generated successfully
+Partition 0:
+        LBA start sector: 2048, address: 1048576,
+        sector count: 7953, size: 4071936,
+        type: 2
+
+Partition 1:
+        LBA start sector: 10240, address: 5242880,
+        sector count: 10240, size: 5242880,
+        type: 2
+
+I (395) esp_ext_part_tables_example_basic: Example ended
+```
+
+Your output will be different based on (micro)SD card used, partitioning and formatting applied.
+
+## Documentation
+
+See the esp_ext_part_tables component's README.md file.