/*      $NetBSD: msdos.c,v 1.25 2024/02/29 08:13:52 tkusumi 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.
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#include <sys/cdefs.h>
#if defined(__RCSID) && !defined(__lint)
__RCSID("$NetBSD: msdos.c,v 1.25 2024/02/29 08:13:52 tkusumi Exp $");
#endif  /* !__lint */

#include <sys/param.h>

#if !HAVE_NBTOOL_CONFIG_H
#include <sys/mount.h>
#endif

#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <util.h>

#include <ffs/buf.h>
#include <fs/msdosfs/bpb.h>
#include <fs/msdosfs/denode.h>
#include <fs/msdosfs/msdosfsmount.h>
#include "makefs.h"
#include "msdos.h"
#include "mkfs_msdos.h"

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

struct msdos_options_ex {
       struct msdos_options options;
       bool utf8;
};

void
msdos_prep_opts(fsinfo_t *fsopts)
{
       struct msdos_options_ex *msdos_opt = ecalloc(1, sizeof(*msdos_opt));
       const option_t msdos_options[] = {
#define AOPT(_opt, _type, _name, _min, _desc) {                         \
       .letter = _opt,                                                 \
       .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->options._name,                             \
       .minimum = _min,                                                \
       .maximum = sizeof(_type) == 1 ? 0xff :                          \
           (sizeof(_type) == 2 ? 0xffff :                              \
           (sizeof(_type) == 4 ? 0xffffffff : 0xffffffffffffffffLL)),  \
       .desc = _desc,                                          \
},
ALLOPTS
#undef AOPT
               { 'U', "utf8", &msdos_opt->utf8, OPT_BOOL,
                 0, 1, "Use UTF8 names" },
               { .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);

       if (debug & DEBUG_FS_PARSE_OPTS)
               printf("%s: got `%s'\n", __func__, option);

       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_ex *msdos_opt = fsopts->fs_specific;
       struct vnode vp, rootvp;
       struct timeval  start;
       struct msdosfsmount *pmp;
       uint32_t flags;

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

       fsopts->size = fsopts->maxsize;
       msdos_opt->options.create_size = MAX(msdos_opt->options.create_size,
           fsopts->offset + fsopts->size);
       msdos_opt->options.offset = fsopts->offset;
       if (msdos_opt->options.bytes_per_sector == 0) {
               if (fsopts->sectorsize == -1)
                       fsopts->sectorsize = 512;
               msdos_opt->options.bytes_per_sector = fsopts->sectorsize;
       } else if (fsopts->sectorsize == -1) {
               fsopts->sectorsize = msdos_opt->options.bytes_per_sector;
       } else if (fsopts->sectorsize != msdos_opt->options.bytes_per_sector) {
               err(EXIT_FAILURE, "inconsistent sectorsize -S %u"
                   "!= -o bytes_per_sector %u",
                   fsopts->sectorsize, msdos_opt->options.bytes_per_sector);
       }
       if (stampst.st_ino) {
               msdos_opt->options.timestamp_set = 1;
               msdos_opt->options.timestamp = stampst.st_mtime;
       }

               /* create image */
       printf("Creating `%s'\n", image);
       TIMER_START(start);
       if (mkfs_msdos(image, NULL, &msdos_opt->options) == -1)
               errx(EXIT_FAILURE, "Image file `%s' not created.", image);
       TIMER_RESULTS(start, "mkfs_msdos");

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

       flags = 0;
       if (msdos_opt->utf8)
               flags |= MSDOSFSMNT_UTF8;

       if ((pmp = msdosfs_mount(&vp, flags)) == NULL)
               err(EXIT_FAILURE, "msdosfs_mount");

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

       if (debug & DEBUG_FS_MAKEFS)
               printf("msdos_makefs: image %s directory %s root %p\n",
                   image, dir, root);

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

       if (debug & DEBUG_FS_MAKEFS)
               putchar('\n');

               /* ensure no outstanding buffers remain */
       if (debug & DEBUG_FS_MAKEFS)
               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[MAXPATHLEN];

       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/%s",
                   cur->root, cur->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;
}

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