/*
 * Copyright (c) 2010 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Ákos Kovács <akoskovacs@gmx.com>
 *
 * 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.
 * 3. Neither the name of The DragonFly Project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific, prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
 * COPYRIGHT HOLDERS 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/stat.h>

#include <errno.h>

#include "libfsid.h"

static struct fs_type fs_types[] = {
    { "HAMMER", hammer_probe,   hammer_volname  },
    { "UFS",    ufs_probe,      ufs_volname     },
    { "CD9660", cd9660_probe,   cd9660_volname  },
    { "EXT2",   ext2_probe,     ext2_volname    },
    { "MSDOSFS",msdosfs_probe,  msdosfs_volname },
    { NULL,     NULL,           NULL            }
};

const char *
fsid_fsname(fsid_t id)
{
        if (id < 1)
                return 0;

        return fs_types[id-1].fs_name;
}

int
fsid_fs_count(void)
{
        int count;

        for (count = 0; fs_types[count].fs_name != NULL; count++)
                ;       /* nothing */

        return count;
}

fsid_t
fsid_probe(const char *dev, const char *fs_type)
{
        int i;

        if (dev == NULL || fs_type == NULL)
                return FSID_UNKNOWN;

        for (i = 0; fs_types[i].fs_name != NULL; i++)  {
                if ((strcmp(fs_type, fs_types[i].fs_name)) == 0)
                        return fs_types[i].fs_probe(dev);
        }
        return FSID_UNKNOWN;
}

fsid_t
fsid_probe_all(const char *dev)
{
        int i;
        fsid_t ret;

        if (dev == NULL)
                return FSID_UNKNOWN;

        for (i = 0; fs_types[i].fs_name != NULL; i++) {
                if ((ret = fs_types[i].fs_probe(dev)) != FSID_UNKNOWN)
                        return ret;
        }
        return FSID_UNKNOWN;
}

char *
fsid_volname(const char *dev, const char *fs_type)
{
        int i;

        if (dev == NULL || fs_type == NULL)
                return NULL;

        for (i = 0; fs_types[i].fs_name != NULL; i++) {
                if ((strcmp(fs_type, fs_types[i].fs_name)) == 0) {
                        return fs_types[i].fs_volname(dev);
                }
        }
        return NULL;
}

char *
fsid_volname_all(const char *dev)
{
        int fs_id;

        if (dev == NULL)
                return NULL;

        if ((fs_id = fsid_probe_all(dev)) != 0)
                return fs_types[fs_id - 1].fs_volname(dev);
        else
                return NULL;
}

int
fsid_dev_read(const char *dev, off_t off, size_t len, char *buf)
{
        int fd;

        if ((fd = open(dev, O_RDONLY)) < 0)
                return -1;

        if ((lseek(fd, off, SEEK_SET)) < 0) {
                close(fd);
                return -1;
        }

        bzero(buf, len);
        if ((read(fd, buf, len)) < 0) {
                close(fd);
                return -1;
        }

        close(fd);

        return 0;
}