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      1 /*	$NetBSD: hfsplus.c,v 1.3 2021/09/17 21:06:35 christos Exp $	*/
      2 /*
      3  * Copyright (c) 2019 Conrad Meyer <cem (at) FreeBSD.org>.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     24  * SUCH DAMAGE.
     25  */
     26 #include <sys/cdefs.h>
     27 __RCSID("$NetBSD: hfsplus.c,v 1.3 2021/09/17 21:06:35 christos Exp $");
     28 
     29 #include <assert.h>
     30 #include <err.h>
     31 #include <errno.h>
     32 #include <stdbool.h>
     33 #include <stdint.h>
     34 #include <stdio.h>
     35 #include <stdlib.h>
     36 #include <string.h>
     37 
     38 #include "fstyp.h"
     39 
     40 /*
     41  * https://developer.apple.com/library/archive/technotes/tn/tn1150.html
     42  */
     43 
     44 #define	VOL_HDR_OFF	1024
     45 
     46 typedef uint32_t hfsp_cat_nodeid;
     47 
     48 typedef struct hfsp_ext_desc {
     49 	uint32_t	ex_startBlock;
     50 	uint32_t	ex_blockCount;
     51 } hfsp_ext_desc;
     52 
     53 typedef struct hfsp_fork_data {
     54 	uint64_t	fd_logicalSz;
     55 	uint32_t	fd_clumpSz;
     56 	uint32_t	fd_totalBlocks;
     57 	hfsp_ext_desc	fd_extents[8];
     58 } hfsp_fork_data;
     59 
     60 struct hfsp_vol_hdr {
     61 	char		hp_signature[2];
     62 	uint16_t	hp_version;
     63 	uint32_t	hp_attributes;
     64 	uint32_t	hp_lastMounted;
     65 	uint32_t	hp_journalInfoBlock;
     66 
     67 	/* Creation / etc dates. */
     68 	uint32_t	hp_create;
     69 	uint32_t	hp_modify;
     70 	uint32_t	hp_backup;
     71 	uint32_t	hp_checked;
     72 
     73 	/* Stats */
     74 	uint32_t	hp_files;
     75 	uint32_t	hp_folders;
     76 
     77 	/* Parameters */
     78 	uint32_t	hp_blockSize;
     79 	uint32_t	hp_totalBlocks;
     80 	uint32_t	hp_freeBlocks;
     81 
     82 	uint32_t	hp_nextAlloc;
     83 	uint32_t	hp_rsrcClumpSz;
     84 	uint32_t	hp_dataClumpSz;
     85 
     86 	hfsp_cat_nodeid	hp_nextCatID;
     87 
     88 	uint32_t	hp_writeCount;
     89 	uint64_t	hp_encodingsBM;
     90 
     91 	uint32_t	hp_finderInfo[8];
     92 
     93 	hfsp_fork_data	hp_allocationFile;
     94 	hfsp_fork_data	hp_extentsFile;
     95 	hfsp_fork_data	hp_catalogFile;
     96 	hfsp_fork_data	hp_attributesFile;
     97 	hfsp_fork_data	hp_startupFile;
     98 };
     99 _Static_assert(sizeof(struct hfsp_vol_hdr) == 512, "");
    100 
    101 int
    102 fstyp_hfsp(FILE *fp, char *label, size_t size)
    103 {
    104 	struct hfsp_vol_hdr *hdr;
    105 	int retval;
    106 
    107 	retval = 1;
    108 	hdr = read_buf(fp, VOL_HDR_OFF, sizeof(*hdr));
    109 	if (hdr == NULL)
    110 		goto fail;
    111 
    112 	if ((strncmp(hdr->hp_signature, "H+", 2) != 0 || hdr->hp_version != 4)
    113 	    &&
    114 	    (strncmp(hdr->hp_signature, "HX", 2) != 0 || hdr->hp_version != 5))
    115 		goto fail;
    116 
    117 	/* This is an HFS+ volume. */
    118 	retval = 0;
    119 
    120 	/* No label support yet. */
    121 
    122 fail:
    123 	free(hdr);
    124 	return (retval);
    125 }
    126