/*      $NetBSD: hfsplus.c,v 1.3 2021/09/17 21:06:35 christos Exp $     */
/*
* Copyright (c) 2019 Conrad Meyer <[email protected]>.  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>
__RCSID("$NetBSD: hfsplus.c,v 1.3 2021/09/17 21:06:35 christos Exp $");

#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. */

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