Atmosphere/fusee/fusee-secondary/src/gpt.h

#ifndef FUSEE_GPT_H
#define FUSEE_GPT_H

#include <stdio.h>

#include <stdint.h>

typedef struct efi_entry_t {
    uint8_t type_uuid[16];
    uint8_t unique_uuid[16];
    uint64_t first_lba;
    uint64_t last_lba; /* Inclusive */
    uint64_t attributes;
    uint16_t name[36];
} efi_entry_t;

typedef struct efi_header {
    uint8_t magic[8]; /* Must be "EFI PART" */
    uint32_t revision;

    uint32_t header_size; /* Usually and at most 92 bytes. */
    uint32_t header_crc32; /* 0 during the computation */
    uint32_t reserved; /* Must be 0. */

    uint64_t header_lba;
    uint64_t backup_lba;
    uint64_t partitions_first_lba;
    uint64_t partitions_last_lba;

    uint8_t disk_guid[16];

    uint64_t entries_first_lba;
    uint32_t entry_count;
    uint32_t entry_size;
    uint32_t entries_crc32;
} __attribute__((packed, aligned(4))) efi_header_t;

typedef int (*gpt_entry_iterator_t)(const efi_entry_t *entry, size_t entry_offset, FILE *disk);

int gpt_get_header(efi_header_t *out, FILE *disk);
int gpt_iterate_through_entries(FILE *disk, gpt_entry_iterator_t callback);

#endif