108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
/*
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* Copyright (c) 2019 Conrad Meyer <cem@FreeBSD.org>. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <assert.h>
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#include <err.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "fstyp.h"
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/*
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* This really detects the container format, which might be best supported by
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* geom_part or a special GEOM class.
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*
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* https://developer.apple.com/support/downloads/Apple-File-System-Reference.pdf
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*/
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#define NX_CKSUM_SZ 8
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typedef uint64_t nx_oid_t;
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typedef uint64_t nx_xid_t;
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struct nx_obj {
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uint8_t o_cksum[NX_CKSUM_SZ]; /* Fletcher 64 */
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nx_oid_t o_oid;
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nx_xid_t o_xid;
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uint32_t o_type;
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uint32_t o_subtype;
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};
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/* nx_obj::o_oid */
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#define OID_NX_SUPERBLOCK 1
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/* nx_obj::o_type: */
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#define OBJECT_TYPE_MASK 0x0000ffff
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#define OBJECT_TYPE_NX_SUPERBLOCK 0x00000001
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#define OBJECT_TYPE_FLAGS_MASK 0xffff0000
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#define OBJ_STORAGETYPE_MASK 0xc0000000
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#define OBJECT_TYPE_FLAGS_DEFINED_MASK 0xf8000000
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#define OBJ_STORAGE_VIRTUAL 0x00000000
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#define OBJ_STORAGE_EPHEMERAL 0x80000000
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#define OBJ_STORAGE_PHYSICAL 0x40000000
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#define OBJ_NOHEADER 0x20000000
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#define OBJ_ENCRYPTED 0x10000000
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#define OBJ_NONPERSISTENT 0x08000000
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struct nx_superblock {
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struct nx_obj nx_o;
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char nx_magic[4];
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/* ... other stuff that doesn't matter */
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};
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int
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fstyp_apfs(FILE *fp, char *label, size_t size)
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{
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struct nx_superblock *csb;
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int retval;
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retval = 1;
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csb = read_buf(fp, 0, sizeof(*csb));
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if (csb == NULL)
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goto fail;
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/* Ideally, checksum the SB here. */
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if (strncmp(csb->nx_magic, "NXSB", 4) != 0 ||
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csb->nx_o.o_oid != OID_NX_SUPERBLOCK ||
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(csb->nx_o.o_type & OBJECT_TYPE_MASK) != OBJECT_TYPE_NX_SUPERBLOCK)
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goto fail;
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retval = 0;
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/* No label support yet. */
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fail:
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free(csb);
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return (retval);
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}
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