Fat32 implementation basics

CMakeLists.txt

@@ -6,4 +6,6 @@ set(CMAKE_C_STANDARD 11)
 add_library(embpart embpart.c
         mbr/mbr.c
         mbr/mbr.h
-        ../test/main.c)
+        ../test/main.c
+        fs/fat32/fat32.c
+        fs/fat32/fat32.h)

fs/fat32/fat32.c

@@ -0,0 +1,5 @@
+//
+// Created by epagris on 2023.09.28..
+//
+
+#include "fat32.h"

fs/fat32/fat32.h

@@ -0,0 +1,36 @@
+#ifndef EMBPART_FAT32_H
+#define EMBPART_FAT32_H
+
+#include <stdint.h>
+
+typedef struct {
+    uint8_t boot_jump[3]; // jump instruction used for bootable volume
+    uint8_t formatter_name[8]; // identification of application or OS formatted this device
+    uint16_t bytes_per_sector; // number of bytes per sector
+    uint8_t sectors_per_cluster; // number of sectors per cluster
+    uint16_t n_reserved_sectors; // number of reserved sectors
+    uint8_t n_fats; // number of FAT copies
+    uint8_t _unused0[2];
+    uint8_t _unused1[2];
+    uint8_t media_descriptor; // media descriptor differentiating between removable and non-removable devices
+    uint8_t _unused2[2];
+    uint16_t sectors_per_track; // number of sectors per track
+    uint16_t n_heads; // number of heads
+    uint32_t n_hidden_sectors; // number of hidden sectors preceding this volume
+    uint32_t n_total_sectors; // total number of sectors in this volume
+    uint32_t n_sectors_per_fat; // number of sectors per FAT
+    uint16_t flags; // flags, see docs.
+    uint16_t version; // FAT version number
+    uint32_t root_first_cluster; // first cluster of the root directory
+    uint16_t fsinfo_sector; // sector of the FSINFO structure
+    uint16_t boot_backup_sector; // sector of backup boot code in the reserved region
+    uint8_t _reserved0[12];
+    uint8_t logical_driver_number; // logical drive number of the partition
+    uint8_t _reserved1;
+    uint8_t extended_boot_signature; // extended boot signature
+    uint32_t volume_serial_number; // volume serial number
+    uint8_t volume_label[11]; // volume label string
+    uint8_t fs_type[8]; // file system type ("FAT32")
+} __attribute__((packed)) Bpb_Fat32;
+
+#endif //EMBPART_FAT32_H