78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
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/*
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* Copyright (c) 2017 Conrad Meyer <cem@FreeBSD.org>
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* 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 <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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struct exfat_vbr {
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char ev_jmp[3];
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char ev_fsname[8];
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char ev_zeros[53];
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uint64_t ev_part_offset;
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uint64_t ev_vol_length;
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uint32_t ev_fat_offset;
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uint32_t ev_fat_length;
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uint32_t ev_cluster_offset;
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uint32_t ev_cluster_count;
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uint32_t ev_rootdir_cluster;
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uint32_t ev_vol_serial;
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uint16_t ev_fs_revision;
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uint16_t ev_vol_flags;
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uint8_t ev_log_bytes_per_sect;
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uint8_t ev_log_sect_per_clust;
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uint8_t ev_num_fats;
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uint8_t ev_drive_sel;
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uint8_t ev_percent_used;
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} __packed;
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int
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fstyp_exfat(FILE *fp, char *label, size_t size)
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{
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struct exfat_vbr *ev;
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ev = (struct exfat_vbr *)read_buf(fp, 0, 512);
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if (ev == NULL || strncmp(ev->ev_fsname, "EXFAT ", 8) != 0)
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goto fail;
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/*
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* Reading the volume label requires walking the root directory to look
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* for a special label file. Left as an exercise for the reader.
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*/
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free(ev);
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return (0);
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fail:
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free(ev);
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return (1);
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}
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