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/* cpio.c - cpio and tar filesystem. */
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2007 Free Software Foundation, Inc.
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include <grub/file.h>
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#include <grub/misc.h>
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#include <grub/disk.h>
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#define MAGIC_BCPIO 070707
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grub_uint16_t mtime_1;
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grub_uint16_t mtime_2;
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grub_uint16_t namesize;
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grub_uint16_t filesize_1;
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grub_uint16_t filesize_2;
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} __attribute__ ((packed));
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#define MAGIC_USTAR "ustar"
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} __attribute__ ((packed));
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#define HEAD_LENG sizeof(struct HEAD_USTAR)
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static grub_dl_t my_mod;
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grub_cpio_find_file (struct grub_cpio_data *data, char **name,
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if (data->mode == MODE_BCPIO)
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(data->disk, 0, data->hofs, sizeof (hd), (char *) &hd))
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if (hd.magic != MAGIC_BCPIO)
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return grub_error (GRUB_ERR_BAD_FS, "Invalid cpio archive");
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data->size = (((grub_uint32_t) hd.filesize_1) << 16) + hd.filesize_2;
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return GRUB_ERR_FILE_NOT_FOUND;
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if ((*name = grub_malloc (hd.namesize)) == NULL)
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if (grub_disk_read (data->disk, 0, data->hofs + sizeof (hd),
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data->dofs = data->hofs + sizeof (hd) + hd.namesize;
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*ofs = data->dofs + data->size;
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struct HEAD_USTAR hd;
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(data->disk, 0, data->hofs, sizeof (hd), (char *) &hd))
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return GRUB_ERR_FILE_NOT_FOUND;
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if (grub_memcmp (hd.magic, MAGIC_USTAR, sizeof (MAGIC_USTAR) - 1))
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return grub_error (GRUB_ERR_BAD_FS, "Invalid tar archive");
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if ((*name = grub_strdup (hd.name)) == NULL)
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data->size = grub_strtoul (hd.size, NULL, 8);
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data->dofs = data->hofs + GRUB_DISK_SECTOR_SIZE;
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*ofs = data->dofs + ((data->size + GRUB_DISK_SECTOR_SIZE - 1) &
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~(GRUB_DISK_SECTOR_SIZE - 1));
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return GRUB_ERR_NONE;
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static struct grub_cpio_data *
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grub_cpio_mount (grub_disk_t disk)
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struct grub_cpio_data *data;
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if (grub_disk_read (disk, 0, 0, sizeof (hd), hd))
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if (((struct HEAD_BCPIO *) hd)->magic == MAGIC_BCPIO)
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else if (!grub_memcmp (((struct HEAD_USTAR *) hd)->magic, MAGIC_USTAR,
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sizeof (MAGIC_USTAR) - 1))
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data = (struct grub_cpio_data *) grub_malloc (sizeof (*data));
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grub_error (GRUB_ERR_BAD_FS, "not a cpio filesystem");
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grub_cpio_dir (grub_device_t device, const char *path,
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int (*hook) (const char *filename, int dir))
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struct grub_cpio_data *data;
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char *prev, *name, *np;
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grub_dl_ref (my_mod);
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data = grub_cpio_mount (device->disk);
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len = grub_strlen (path) - 1;
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if (grub_cpio_find_file (data, &name, &ofs))
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if (grub_memcmp (np, name, len) == 0)
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p = grub_strchr (name + len, '/');
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if ((!prev) || (grub_strcmp (prev, name) != 0))
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hook (name + len, p != NULL);
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grub_dl_unref (my_mod);
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grub_cpio_open (grub_file_t file, const char *name)
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struct grub_cpio_data *data;
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grub_dl_ref (my_mod);
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data = grub_cpio_mount (file->device->disk);
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if (grub_cpio_find_file (data, &fn, &ofs))
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if (grub_strcmp (name + 1, fn) == 0)
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file->size = data->size;
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return GRUB_ERR_NONE;
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grub_dl_unref (my_mod);
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grub_cpio_read (grub_file_t file, char *buf, grub_size_t len)
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struct grub_cpio_data *data;
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return (grub_disk_read (data->disk, 0, data->dofs + file->offset,
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len, buf)) ? -1 : len;
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grub_cpio_close (grub_file_t file)
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grub_free (file->data);
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grub_dl_unref (my_mod);
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static struct grub_fs grub_cpio_fs = {
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.dir = grub_cpio_dir,
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.open = grub_cpio_open,
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.read = grub_cpio_read,
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.close = grub_cpio_close,
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grub_fs_register (&grub_cpio_fs);
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grub_fs_unregister (&grub_cpio_fs);