/*
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2019 Conrad Meyer <cem@FreeBSD.org>.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "fstyp.h"

/*
 * https://developer.apple.com/library/archive/technotes/tn/tn1150.html
 */

#define VOL_HDR_OFF     1024

typedef uint32_t hfsp_cat_nodeid;

typedef struct hfsp_ext_desc {
        uint32_t        ex_startBlock;
        uint32_t        ex_blockCount;
} hfsp_ext_desc;

typedef struct hfsp_fork_data {
        uint64_t        fd_logicalSz;
        uint32_t        fd_clumpSz;
        uint32_t        fd_totalBlocks;
        hfsp_ext_desc   fd_extents[8];
} hfsp_fork_data;

struct hfsp_vol_hdr {
        char            hp_signature[2];
        uint16_t        hp_version;
        uint32_t        hp_attributes;
        uint32_t        hp_lastMounted;
        uint32_t        hp_journalInfoBlock;

        /* Creation / etc dates. */
        uint32_t        hp_create;
        uint32_t        hp_modify;
        uint32_t        hp_backup;
        uint32_t        hp_checked;

        /* Stats */
        uint32_t        hp_files;
        uint32_t        hp_folders;

        /* Parameters */
        uint32_t        hp_blockSize;
        uint32_t        hp_totalBlocks;
        uint32_t        hp_freeBlocks;

        uint32_t        hp_nextAlloc;
        uint32_t        hp_rsrcClumpSz;
        uint32_t        hp_dataClumpSz;

        hfsp_cat_nodeid hp_nextCatID;

        uint32_t        hp_writeCount;
        uint64_t        hp_encodingsBM;

        uint32_t        hp_finderInfo[8];

        hfsp_fork_data  hp_allocationFile;
        hfsp_fork_data  hp_extentsFile;
        hfsp_fork_data  hp_catalogFile;
        hfsp_fork_data  hp_attributesFile;
        hfsp_fork_data  hp_startupFile;
};
_Static_assert(sizeof(struct hfsp_vol_hdr) == 512, "");

int
fstyp_hfsp(FILE *fp, char *label, size_t size)
{
        struct hfsp_vol_hdr *hdr;
        int retval;

        retval = 1;
        hdr = read_buf(fp, VOL_HDR_OFF, sizeof(*hdr));
        if (hdr == NULL)
                goto fail;

        if ((strncmp(hdr->hp_signature, "H+", 2) != 0 || hdr->hp_version != 4)
            &&
            (strncmp(hdr->hp_signature, "HX", 2) != 0 || hdr->hp_version != 5))
                goto fail;

        /* This is an HFS+ volume. */
        retval = 0;

        /* No label support yet. */
        (void)size;
        (void)label;

fail:
        free(hdr);
        return (retval);
}