/*      $OpenBSD: msdos.c,v 1.13 2021/10/06 00:40:39 deraadt Exp $      */
/*      $NetBSD: msdos.c,v 1.16 2016/01/30 09:59:27 mlelstv Exp $       */

/*-
 * Copyright (c) 2013 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christos Zoulas.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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/types.h>
#include <assert.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <string.h>

#include "ffs/buf.h"
#include "msdos/denode.h"
#include "makefs.h"
#include "msdos.h"
#include "msdos/mkfs_msdos.h"

static int msdos_populate_dir(const char *, struct denode *, fsnode *,
    fsnode *, fsinfo_t *);

void
msdos_prep_opts(fsinfo_t *fsopts)
{
        struct msdos_options *msdos_opt = ecalloc(1, sizeof(*msdos_opt));
        const option_t msdos_options[] = {
#define AOPT(_type, _name, _min) {                                      \
        .name = # _name,                                                \
        .type = _min == -1 ? OPT_STRPTR :                               \
            (_min == -2 ? OPT_BOOL :                                    \
            (sizeof(_type) == 1 ? OPT_INT8 :                            \
            (sizeof(_type) == 2 ? OPT_INT16 :                           \
            (sizeof(_type) == 4 ? OPT_INT32 : OPT_INT64)))),            \
        .value = &msdos_opt->_name,                                     \
        .minimum = _min,                                                \
        .maximum = sizeof(_type) == 1 ? 0xff :                          \
            (sizeof(_type) == 2 ? 0xffff :                              \
            (sizeof(_type) == 4 ? 0xffffffff : 0x7fffffffffffffffLL)),  \
},
ALLOPTS
#undef AOPT
                { .name = NULL }
        };

        fsopts->fs_specific = msdos_opt;
        fsopts->fs_options = copy_opts(msdos_options);
}

void
msdos_cleanup_opts(fsinfo_t *fsopts)
{
        free(fsopts->fs_specific);
        free(fsopts->fs_options);
}

int
msdos_parse_opts(const char *option, fsinfo_t *fsopts)
{
        struct msdos_options *msdos_opt = fsopts->fs_specific;
        option_t *msdos_options = fsopts->fs_options;

        int rv;

        assert(option != NULL);
        assert(fsopts != NULL);
        assert(msdos_opt != NULL);

        rv = set_option(msdos_options, option, NULL, 0);
        if (rv == -1)
                return rv;

        if (strcmp(msdos_options[rv].name, "volume_id") == 0)
                msdos_opt->volume_id_set = 1;
        else if (strcmp(msdos_options[rv].name, "media_descriptor") == 0)
                msdos_opt->media_descriptor_set = 1;
        else if (strcmp(msdos_options[rv].name, "hidden_sectors") == 0)
                msdos_opt->hidden_sectors_set = 1;
        return 1;
}


void
msdos_makefs(const char *image, const char *dir, fsnode *root, fsinfo_t *fsopts)
{
        struct msdos_options *msdos_opt = fsopts->fs_specific;
        struct mkfsvnode vp, rootvp;
        struct msdosfsmount *pmp;

        assert(image != NULL);
        assert(dir != NULL);
        assert(root != NULL);
        assert(fsopts != NULL);

        /*
         * XXX: pick up other options from the msdos specific ones?
         * Is minsize right here?
         */
        msdos_opt->create_size = MAXIMUM(msdos_opt->create_size,
                fsopts->minsize);
        msdos_opt->offset = fsopts->offset;
        if (msdos_opt->bytes_per_sector == 0) {
                if (fsopts->sectorsize == -1)
                        fsopts->sectorsize = 512;
                msdos_opt->bytes_per_sector = fsopts->sectorsize;
        } else if (fsopts->sectorsize == -1) {
                fsopts->sectorsize = msdos_opt->bytes_per_sector;
        } else if (fsopts->sectorsize != msdos_opt->bytes_per_sector) {
                err(1, "inconsistent sectorsize -S %u"
                    "!= -o bytes_per_sector %u",
                    fsopts->sectorsize, msdos_opt->bytes_per_sector);
        }

                /* create image */
        printf("Creating `%s'\n", image);
        if (mkfs_msdos(image, NULL, msdos_opt) == -1)
                return;

        fsopts->fd = open(image, O_RDWR);
        vp.fs = fsopts;

        if ((pmp = msdosfs_mount(&vp, 0)) == NULL)
                err(1, "msdosfs_mount");

        if (msdosfs_root(pmp, &rootvp) != 0)
                err(1, "msdosfs_root");

                /* populate image */
        printf("Populating `%s'\n", image);
        if (msdos_populate_dir(dir, VTODE(&rootvp), root, root, fsopts) == -1)
                errx(1, "Image file `%s' not created.", image);

        bcleanup();

        printf("Image `%s' complete\n", image);
}

static int
msdos_populate_dir(const char *path, struct denode *dir, fsnode *root,
    fsnode *parent, fsinfo_t *fsopts)
{
        fsnode *cur;
        char pbuf[PATH_MAX];

        assert(dir != NULL);
        assert(root != NULL);
        assert(fsopts != NULL);

        for (cur = root->next; cur != NULL; cur = cur->next) {
                if ((size_t)snprintf(pbuf, sizeof(pbuf), "%s/%s", path,
                    cur->name) >= sizeof(pbuf)) {
                        warnx("path %s too long", pbuf);
                        return -1;
                }

                if ((cur->inode->flags & FI_ALLOCATED) == 0) {
                        cur->inode->flags |= FI_ALLOCATED;
                        if (cur != root) {
                                fsopts->curinode++;
                                cur->inode->ino = fsopts->curinode;
                                cur->parent = parent;
                        }
                }

                if (cur->inode->flags & FI_WRITTEN) {
                        continue;       // hard link
                }
                cur->inode->flags |= FI_WRITTEN;

                if (cur->child) {
                        struct denode *de;
                        if ((de = msdosfs_mkdire(pbuf, dir, cur)) == NULL) {
                                warn("msdosfs_mkdire %s", pbuf);
                                return -1;
                        }
                        if (msdos_populate_dir(pbuf, de, cur->child, cur,
                            fsopts) == -1) {
                                warn("msdos_populate_dir %s", pbuf);
                                return -1;
                        }
                        continue;
                } else if (!S_ISREG(cur->type)) {
                        warnx("skipping non-regular file %s/%s", cur->path,
                            cur->name);
                        continue;
                }
                if (msdosfs_mkfile(pbuf, dir, cur) == NULL) {
                        warn("msdosfs_mkfile %s", pbuf);
                        return -1;
                }
        }
        return 0;
}