/*
 * Copyright (C) 2016 Paul Kocialkowski <contact@paulk.fr>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef _GPT_H_
#define _GPT_H_

#include <stdint.h>

/*
 * Values
 */

#define GPT_BLOCK_SIZE						512

#define GPT_HEADER_LBA						1
#define GPT_VERSION						0x00010000

#define GPT_CRC_SEED						0xffffffff

#define GPT_PARTITION_NAME_COUNT				36

#define GPT_SIGNATURE				"EFI PART"

/*
 * Structures
 */

struct gpt_header {
	char signature[8];
	uint32_t version;
	uint32_t size;
	uint32_t crc;
	uint32_t reserved;
	uint64_t current_lba;
	uint64_t backup_lba;
	uint64_t first_lba;
	uint64_t last_lba;
	uint8_t guid[16];
	uint64_t partitions_lba;
	uint32_t partitions_count;
	uint32_t partitions_size;
	uint32_t partitions_crc;
} __attribute__((__packed__));

struct gpt_partition {
	uint8_t type_guid[16];
	uint8_t guid[16];
	uint64_t first_lba;
	uint64_t last_lba;
	uint64_t flags;
	int16_t name[GPT_PARTITION_NAME_COUNT];
} __attribute__((__packed__));

/*
 * Functions
 */

int gpt_header_verify(struct gpt_header *header);
int gpt_header_read(struct context *context, struct gpt_header *header);
int gpt_partition_find(struct context *context);
int gpt_partitions_print(struct context *context);

#endif