usr.sbin/fstyp/hammer2.c

   1 /*-
   2  * Copyright (c) 2017 The DragonFly Project
   3  * All rights reserved.
   4  *
   5  * This software was developed by Edward Tomasz Napierala under sponsorship
   6  * from the FreeBSD Foundation.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <err.h>
  34 #include <vfs/hammer2/hammer2_disk.h>
  35
  36 #include "fstyp.h"
  37
  38 static hammer2_volume_data_t*
  39 __read_voldata(FILE *fp)
  40 {
  41         hammer2_volume_data_t *voldata;
  42
  43         voldata = read_buf(fp, 0, sizeof(*voldata));
  44         if (voldata == NULL)
  45                 err(1, "failed to read volume data");
  46
  47         return (voldata);
  48 }
  49
  50 static int
  51 __test_voldata(const hammer2_volume_data_t *voldata)
  52 {
  53         if (voldata->magic != HAMMER2_VOLUME_ID_HBO &&
  54             voldata->magic != HAMMER2_VOLUME_ID_ABO)
  55                 return (1);
  56
  57         return (0);
  58 }
  59
  60 int
  61 fstyp_hammer2(FILE *fp, char *label, size_t size)
  62 {
  63         hammer2_volume_data_t *voldata;
  64         int error = 1;
  65
  66         voldata = __read_voldata(fp);
  67         if (__test_voldata(voldata))
  68                 goto done;
  69
  70         // XXX -l option not supported yet
  71         //strlcpy(label, "label", size);
  72
  73         error = 0;
  74 done:
  75         free(voldata);
  76         return (error);
  77 }