faec96afc8
* fs/cpio.c: Use the same name "struct head" for tar and cpio to facilitate code reuse. (grub_cpio_mount): Use "struct head", not a char buffer. This fixes a warning reported by gcc 4.4.
371 lines
7 KiB
C
371 lines
7 KiB
C
/* cpio.c - cpio and tar filesystem. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2007,2008 Free Software Foundation, Inc.
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*
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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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*
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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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*
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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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*/
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#include <grub/file.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/disk.h>
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#include <grub/dl.h>
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#ifndef MODE_USTAR
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/* cpio support */
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#define MAGIC_BCPIO 070707
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struct head
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{
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grub_uint16_t magic;
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grub_uint16_t dev;
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grub_uint16_t ino;
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grub_uint16_t mode;
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grub_uint16_t uid;
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grub_uint16_t gid;
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grub_uint16_t nlink;
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grub_uint16_t rdev;
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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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#else
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/* tar support */
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#define MAGIC_USTAR "ustar"
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struct head
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{
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char name[100];
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char mode[8];
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char uid[8];
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char gid[8];
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char size[12];
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char mtime[12];
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char chksum[8];
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char typeflag;
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char linkname[100];
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char magic[6];
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char version[2];
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char uname[32];
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char gname[32];
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char devmajor[8];
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char devminor[8];
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char prefix[155];
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} __attribute__ ((packed));
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#endif
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struct grub_cpio_data
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{
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grub_disk_t disk;
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grub_uint32_t hofs;
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grub_uint32_t dofs;
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grub_uint32_t size;
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};
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static grub_dl_t my_mod;
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static grub_err_t
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grub_cpio_find_file (struct grub_cpio_data *data, char **name,
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grub_uint32_t * ofs)
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{
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#ifndef MODE_USTAR
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struct head hd;
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if (grub_disk_read
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(data->disk, 0, data->hofs, sizeof (hd), &hd))
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return grub_errno;
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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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if (hd.namesize & 1)
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hd.namesize++;
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if ((*name = grub_malloc (hd.namesize)) == NULL)
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return grub_errno;
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if (grub_disk_read (data->disk, 0, data->hofs + sizeof (hd),
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hd.namesize, *name))
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{
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grub_free (*name);
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return grub_errno;
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}
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if (data->size == 0 && hd.mode == 0 && hd.namesize == 11 + 1
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&& ! grub_memcmp(*name, "TRAILER!!!", 11))
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{
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*ofs = 0;
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return GRUB_ERR_NONE;
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}
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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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if (data->size & 1)
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(*ofs)++;
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#else
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struct head hd;
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if (grub_disk_read
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(data->disk, 0, data->hofs, sizeof (hd), &hd))
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return grub_errno;
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if (!hd.name[0])
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{
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*ofs = 0;
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return GRUB_ERR_NONE;
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}
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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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return grub_errno;
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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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#endif
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return GRUB_ERR_NONE;
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}
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static struct grub_cpio_data *
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grub_cpio_mount (grub_disk_t disk)
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{
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struct head hd;
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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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goto fail;
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#ifndef MODE_USTAR
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if (hd.magic != MAGIC_BCPIO)
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#else
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if (grub_memcmp (hd.magic, MAGIC_USTAR,
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sizeof (MAGIC_USTAR) - 1))
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#endif
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goto fail;
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data = (struct grub_cpio_data *) grub_malloc (sizeof (*data));
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if (!data)
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goto fail;
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data->disk = disk;
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return data;
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fail:
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grub_error (GRUB_ERR_BAD_FS, "not a "
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#ifdef MODE_USTAR
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"tar"
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#else
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"cpio"
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#endif
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" filesystem");
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return 0;
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}
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static grub_err_t
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grub_cpio_dir (grub_device_t device, const char *path,
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int (*hook) (const char *filename,
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const struct grub_dirhook_info *info))
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{
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struct grub_cpio_data *data;
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grub_uint32_t ofs;
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char *prev, *name;
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const char *np;
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int len;
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grub_dl_ref (my_mod);
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prev = 0;
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data = grub_cpio_mount (device->disk);
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if (!data)
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goto fail;
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np = path + 1;
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len = grub_strlen (path) - 1;
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data->hofs = 0;
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while (1)
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{
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if (grub_cpio_find_file (data, &name, &ofs))
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goto fail;
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if (!ofs)
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break;
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if (grub_memcmp (np, name, len) == 0)
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{
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char *p, *n;
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n = name + len;
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if (*n == '/')
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n++;
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p = grub_strchr (name + len, '/');
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if (p)
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*p = 0;
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if ((!prev) || (grub_strcmp (prev, name) != 0))
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{
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struct grub_dirhook_info info;
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grub_memset (&info, 0, sizeof (info));
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info.dir = (p != NULL);
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hook (name + len, &info);
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if (prev)
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grub_free (prev);
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prev = name;
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}
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else
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grub_free (name);
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}
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data->hofs = ofs;
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}
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fail:
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if (prev)
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grub_free (prev);
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if (data)
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grub_free (data);
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grub_dl_unref (my_mod);
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return grub_errno;
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}
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static grub_err_t
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grub_cpio_open (grub_file_t file, const char *name)
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{
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struct grub_cpio_data *data;
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grub_uint32_t ofs;
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char *fn;
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int i, j;
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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 (!data)
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goto fail;
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data->hofs = 0;
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while (1)
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{
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if (grub_cpio_find_file (data, &fn, &ofs))
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goto fail;
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if (!ofs)
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{
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grub_error (GRUB_ERR_FILE_NOT_FOUND, "file not found");
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break;
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}
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/* Compare NAME and FN by hand in order to cope with duplicate
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slashes. */
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i = 1;
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j = 0;
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while (1)
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{
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if (name[i] != fn[j])
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goto no_match;
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if (name[i] == '\0')
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break;
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if (name[i] == '/' && name[i+1] == '/')
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i++;
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i++;
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j++;
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}
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file->data = data;
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file->size = data->size;
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grub_free (fn);
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return GRUB_ERR_NONE;
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no_match:
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grub_free (fn);
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data->hofs = ofs;
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}
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fail:
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if (data)
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grub_free (data);
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grub_dl_unref (my_mod);
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return grub_errno;
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}
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static grub_ssize_t
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grub_cpio_read (grub_file_t file, char *buf, grub_size_t len)
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{
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struct grub_cpio_data *data;
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data = file->data;
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return (grub_disk_read (data->disk, 0, data->dofs + file->offset,
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len, buf)) ? -1 : (grub_ssize_t) len;
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}
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static grub_err_t
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grub_cpio_close (grub_file_t file)
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{
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grub_free (file->data);
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grub_dl_unref (my_mod);
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return grub_errno;
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}
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static struct grub_fs grub_cpio_fs = {
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#ifdef MODE_USTAR
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.name = "tarfs",
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#else
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.name = "cpiofs",
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#endif
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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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};
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#ifdef MODE_USTAR
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GRUB_MOD_INIT (cpio)
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#else
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GRUB_MOD_INIT (tar)
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#endif
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{
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grub_fs_register (&grub_cpio_fs);
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my_mod = mod;
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}
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#ifdef MODE_USTAR
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GRUB_MOD_FINI (cpio)
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#else
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GRUB_MOD_FINI (tar)
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#endif
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{
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grub_fs_unregister (&grub_cpio_fs);
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}
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