summaryrefslogtreecommitdiffstats
path: root/grub-core/fs/affs.c
diff options
context:
space:
mode:
Diffstat (limited to 'grub-core/fs/affs.c')
-rw-r--r--grub-core/fs/affs.c709
1 files changed, 709 insertions, 0 deletions
diff --git a/grub-core/fs/affs.c b/grub-core/fs/affs.c
new file mode 100644
index 0000000..cafcd0f
--- /dev/null
+++ b/grub-core/fs/affs.c
@@ -0,0 +1,709 @@
+/* affs.c - Amiga Fast FileSystem. */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2005,2006,2007,2008,2009 Free Software Foundation, Inc.
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/err.h>
+#include <grub/file.h>
+#include <grub/mm.h>
+#include <grub/misc.h>
+#include <grub/disk.h>
+#include <grub/dl.h>
+#include <grub/types.h>
+#include <grub/fshelp.h>
+#include <grub/charset.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+/* The affs bootblock. */
+struct grub_affs_bblock
+{
+ grub_uint8_t type[3];
+ grub_uint8_t flags;
+ grub_uint32_t checksum;
+ grub_uint32_t rootblock;
+} GRUB_PACKED;
+
+/* Set if the filesystem is a AFFS filesystem. Otherwise this is an
+ OFS filesystem. */
+#define GRUB_AFFS_FLAG_FFS 1
+
+/* The affs rootblock. */
+struct grub_affs_rblock
+{
+ grub_uint32_t type;
+ grub_uint8_t unused1[8];
+ grub_uint32_t htsize;
+ grub_uint32_t unused2;
+ grub_uint32_t checksum;
+ grub_uint32_t hashtable[1];
+} GRUB_PACKED;
+
+struct grub_affs_time
+{
+ grub_int32_t day;
+ grub_uint32_t min;
+ grub_uint32_t hz;
+} GRUB_PACKED;
+
+/* The second part of a file header block. */
+struct grub_affs_file
+{
+ grub_uint8_t unused1[12];
+ grub_uint32_t size;
+ grub_uint8_t unused2[92];
+ struct grub_affs_time mtime;
+ grub_uint8_t namelen;
+ grub_uint8_t name[30];
+ grub_uint8_t unused3[5];
+ grub_uint32_t hardlink;
+ grub_uint32_t unused4[6];
+ grub_uint32_t next;
+ grub_uint32_t parent;
+ grub_uint32_t extension;
+ grub_uint32_t type;
+} GRUB_PACKED;
+
+/* The location of `struct grub_affs_file' relative to the end of a
+ file header block. */
+#define GRUB_AFFS_FILE_LOCATION 200
+
+/* The offset in both the rootblock and the file header block for the
+ hashtable, symlink and block pointers (all synonyms). */
+#define GRUB_AFFS_HASHTABLE_OFFSET 24
+#define GRUB_AFFS_BLOCKPTR_OFFSET 24
+#define GRUB_AFFS_SYMLINK_OFFSET 24
+
+enum
+ {
+ GRUB_AFFS_FILETYPE_DIR = 2,
+ GRUB_AFFS_FILETYPE_SYMLINK = 3,
+ GRUB_AFFS_FILETYPE_HARDLINK = 0xfffffffc,
+ GRUB_AFFS_FILETYPE_REG = 0xfffffffd
+ };
+
+#define AFFS_MAX_LOG_BLOCK_SIZE 4
+#define AFFS_MAX_SUPERBLOCK 1
+
+
+
+struct grub_fshelp_node
+{
+ struct grub_affs_data *data;
+ grub_uint32_t block;
+ struct grub_fshelp_node *parent;
+ struct grub_affs_file di;
+ grub_uint32_t *block_cache;
+ grub_uint32_t last_block_cache;
+};
+
+/* Information about a "mounted" affs filesystem. */
+struct grub_affs_data
+{
+ struct grub_affs_bblock bblock;
+ struct grub_fshelp_node diropen;
+ grub_disk_t disk;
+
+ /* Log blocksize in sectors. */
+ int log_blocksize;
+
+ /* The number of entries in the hashtable. */
+ unsigned int htsize;
+};
+
+static grub_dl_t my_mod;
+
+
+static grub_disk_addr_t
+grub_affs_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
+{
+ grub_uint32_t target, curblock;
+ grub_uint32_t pos;
+ struct grub_affs_file file;
+ struct grub_affs_data *data = node->data;
+ grub_uint64_t mod;
+
+ if (!node->block_cache)
+ {
+ node->block_cache = grub_malloc (((grub_be_to_cpu32 (node->di.size)
+ >> (9 + node->data->log_blocksize))
+ / data->htsize + 2)
+ * sizeof (node->block_cache[0]));
+ if (!node->block_cache)
+ return -1;
+ node->last_block_cache = 0;
+ node->block_cache[0] = node->block;
+ }
+
+ /* Files are at most 2G on AFFS, so no need for 64-bit division. */
+ target = (grub_uint32_t) fileblock / data->htsize;
+ mod = (grub_uint32_t) fileblock % data->htsize;
+ /* Find the block that points to the fileblock we are looking up by
+ following the chain until the right table is reached. */
+ for (curblock = node->last_block_cache + 1; curblock < target + 1; curblock++)
+ {
+ grub_disk_read (data->disk,
+ (((grub_uint64_t) node->block_cache[curblock - 1] + 1)
+ << data->log_blocksize) - 1,
+ GRUB_DISK_SECTOR_SIZE - GRUB_AFFS_FILE_LOCATION,
+ sizeof (file), &file);
+ if (grub_errno)
+ return 0;
+
+ node->block_cache[curblock] = grub_be_to_cpu32 (file.extension);
+ node->last_block_cache = curblock;
+ }
+
+ /* Translate the fileblock to the block within the right table. */
+ grub_disk_read (data->disk, (grub_uint64_t) node->block_cache[target]
+ << data->log_blocksize,
+ GRUB_AFFS_BLOCKPTR_OFFSET
+ + (data->htsize - mod - 1) * sizeof (pos),
+ sizeof (pos), &pos);
+ if (grub_errno)
+ return 0;
+
+ return grub_be_to_cpu32 (pos);
+}
+
+static struct grub_affs_data *
+grub_affs_mount (grub_disk_t disk)
+{
+ struct grub_affs_data *data;
+ grub_uint32_t *rootblock = 0;
+ struct grub_affs_rblock *rblock = 0;
+ int log_blocksize = 0;
+ int bsnum = 0;
+
+ data = grub_zalloc (sizeof (struct grub_affs_data));
+ if (!data)
+ return 0;
+
+ for (bsnum = 0; bsnum < AFFS_MAX_SUPERBLOCK + 1; bsnum++)
+ {
+ /* Read the bootblock. */
+ grub_disk_read (disk, bsnum, 0, sizeof (struct grub_affs_bblock),
+ &data->bblock);
+ if (grub_errno)
+ goto fail;
+
+ /* Make sure this is an affs filesystem. */
+ if (grub_strncmp ((char *) (data->bblock.type), "DOS", 3) != 0
+ /* Test if the filesystem is a OFS filesystem. */
+ || !(data->bblock.flags & GRUB_AFFS_FLAG_FFS))
+ continue;
+
+ /* No sane person uses more than 8KB for a block. At least I hope
+ for that person because in that case this won't work. */
+ if (!rootblock)
+ rootblock = grub_malloc (GRUB_DISK_SECTOR_SIZE
+ << AFFS_MAX_LOG_BLOCK_SIZE);
+ if (!rootblock)
+ goto fail;
+
+ rblock = (struct grub_affs_rblock *) rootblock;
+
+ /* The filesystem blocksize is not stored anywhere in the filesystem
+ itself. One way to determine it is try reading blocks for the
+ rootblock until the checksum is correct. */
+ for (log_blocksize = 0; log_blocksize <= AFFS_MAX_LOG_BLOCK_SIZE;
+ log_blocksize++)
+ {
+ grub_uint32_t *currblock = rootblock;
+ unsigned int i;
+ grub_uint32_t checksum = 0;
+
+ /* Read the rootblock. */
+ grub_disk_read (disk,
+ (grub_uint64_t) grub_be_to_cpu32 (data->bblock.rootblock)
+ << log_blocksize, 0,
+ GRUB_DISK_SECTOR_SIZE << log_blocksize, rootblock);
+ if (grub_errno == GRUB_ERR_OUT_OF_RANGE)
+ {
+ grub_errno = 0;
+ break;
+ }
+ if (grub_errno)
+ goto fail;
+
+ if (rblock->type != grub_cpu_to_be32_compile_time (2)
+ || rblock->htsize == 0
+ || currblock[(GRUB_DISK_SECTOR_SIZE << log_blocksize)
+ / sizeof (*currblock) - 1]
+ != grub_cpu_to_be32_compile_time (1))
+ continue;
+
+ for (i = 0; i < (GRUB_DISK_SECTOR_SIZE << log_blocksize)
+ / sizeof (*currblock);
+ i++)
+ checksum += grub_be_to_cpu32 (currblock[i]);
+
+ if (checksum == 0)
+ {
+ data->log_blocksize = log_blocksize;
+ data->disk = disk;
+ data->htsize = grub_be_to_cpu32 (rblock->htsize);
+ data->diropen.data = data;
+ data->diropen.block = grub_be_to_cpu32 (data->bblock.rootblock);
+ data->diropen.parent = NULL;
+ grub_memcpy (&data->diropen.di, rootblock,
+ sizeof (data->diropen.di));
+ grub_free (rootblock);
+
+ return data;
+ }
+ }
+ }
+
+ fail:
+ if (grub_errno == GRUB_ERR_NONE || grub_errno == GRUB_ERR_OUT_OF_RANGE)
+ grub_error (GRUB_ERR_BAD_FS, "not an AFFS filesystem");
+
+ grub_free (data);
+ grub_free (rootblock);
+ return 0;
+}
+
+
+static char *
+grub_affs_read_symlink (grub_fshelp_node_t node)
+{
+ struct grub_affs_data *data = node->data;
+ grub_uint8_t *latin1, *utf8;
+ const grub_size_t symlink_size = ((GRUB_DISK_SECTOR_SIZE
+ << data->log_blocksize) - GRUB_AFFS_SYMLINK_OFFSET);
+
+ latin1 = grub_malloc (symlink_size + 1);
+ if (!latin1)
+ return 0;
+
+ grub_disk_read (data->disk,
+ (grub_uint64_t) node->block << data->log_blocksize,
+ GRUB_AFFS_SYMLINK_OFFSET,
+ symlink_size, latin1);
+ if (grub_errno)
+ {
+ grub_free (latin1);
+ return 0;
+ }
+ latin1[symlink_size] = 0;
+ utf8 = grub_calloc (GRUB_MAX_UTF8_PER_LATIN1 + 1, symlink_size);
+ if (!utf8)
+ {
+ grub_free (latin1);
+ return 0;
+ }
+ *grub_latin1_to_utf8 (utf8, latin1, symlink_size) = '\0';
+ grub_dprintf ("affs", "Symlink: `%s'\n", utf8);
+ grub_free (latin1);
+ if (utf8[0] == ':')
+ utf8[0] = '/';
+ return (char *) utf8;
+}
+
+
+/* Helper for grub_affs_iterate_dir. */
+static int
+grub_affs_create_node (grub_fshelp_node_t dir,
+ grub_fshelp_iterate_dir_hook_t hook, void *hook_data,
+ struct grub_fshelp_node **node,
+ grub_uint32_t **hashtable,
+ grub_uint32_t block, const struct grub_affs_file *fil)
+{
+ struct grub_affs_data *data = dir->data;
+ int type = GRUB_FSHELP_REG;
+ grub_uint8_t name_u8[sizeof (fil->name) * GRUB_MAX_UTF8_PER_LATIN1 + 1];
+ grub_size_t len;
+ unsigned int nest;
+
+ *node = grub_zalloc (sizeof (**node));
+ if (!*node)
+ {
+ grub_free (*hashtable);
+ return 1;
+ }
+
+ (*node)->data = data;
+ (*node)->block = block;
+ (*node)->parent = dir;
+
+ len = fil->namelen;
+ if (len > sizeof (fil->name))
+ len = sizeof (fil->name);
+ *grub_latin1_to_utf8 (name_u8, fil->name, len) = '\0';
+
+ (*node)->di = *fil;
+ for (nest = 0; nest < 8; nest++)
+ {
+ switch ((*node)->di.type)
+ {
+ case grub_cpu_to_be32_compile_time (GRUB_AFFS_FILETYPE_REG):
+ type = GRUB_FSHELP_REG;
+ break;
+ case grub_cpu_to_be32_compile_time (GRUB_AFFS_FILETYPE_DIR):
+ type = GRUB_FSHELP_DIR;
+ break;
+ case grub_cpu_to_be32_compile_time (GRUB_AFFS_FILETYPE_SYMLINK):
+ type = GRUB_FSHELP_SYMLINK;
+ break;
+ case grub_cpu_to_be32_compile_time (GRUB_AFFS_FILETYPE_HARDLINK):
+ {
+ grub_err_t err;
+ (*node)->block = grub_be_to_cpu32 ((*node)->di.hardlink);
+ err = grub_disk_read (data->disk,
+ (((grub_uint64_t) (*node)->block + 1) << data->log_blocksize)
+ - 1,
+ GRUB_DISK_SECTOR_SIZE - GRUB_AFFS_FILE_LOCATION,
+ sizeof ((*node)->di), (char *) &(*node)->di);
+ if (err)
+ return 1;
+ continue;
+ }
+ default:
+ return 0;
+ }
+ break;
+ }
+
+ if (nest == 8)
+ return 0;
+
+ type |= GRUB_FSHELP_CASE_INSENSITIVE;
+
+ if (hook ((char *) name_u8, type, *node, hook_data))
+ {
+ grub_free (*hashtable);
+ *node = 0;
+ return 1;
+ }
+ *node = 0;
+ return 0;
+}
+
+static int
+grub_affs_iterate_dir (grub_fshelp_node_t dir,
+ grub_fshelp_iterate_dir_hook_t hook, void *hook_data)
+{
+ unsigned int i;
+ struct grub_affs_file file;
+ struct grub_fshelp_node *node, *orig_node;
+ struct grub_affs_data *data = dir->data;
+ grub_uint32_t *hashtable;
+
+ /* Create the directory entries for `.' and `..'. */
+ node = orig_node = grub_zalloc (sizeof (*node));
+ if (!node)
+ return 1;
+
+ *node = *dir;
+ if (hook (".", GRUB_FSHELP_DIR, node, hook_data))
+ return 1;
+ if (dir->parent)
+ {
+ *node = *dir->parent;
+ if (hook ("..", GRUB_FSHELP_DIR, node, hook_data))
+ return 1;
+ }
+
+ hashtable = grub_calloc (data->htsize, sizeof (*hashtable));
+ if (!hashtable)
+ return 1;
+
+ grub_disk_read (data->disk,
+ (grub_uint64_t) dir->block << data->log_blocksize,
+ GRUB_AFFS_HASHTABLE_OFFSET,
+ data->htsize * sizeof (*hashtable), (char *) hashtable);
+ if (grub_errno)
+ goto fail;
+
+ for (i = 0; i < data->htsize; i++)
+ {
+ grub_uint32_t next;
+
+ if (!hashtable[i])
+ continue;
+
+ /* Every entry in the hashtable can be chained. Read the entire
+ chain. */
+ next = grub_be_to_cpu32 (hashtable[i]);
+
+ while (next)
+ {
+ grub_disk_read (data->disk,
+ (((grub_uint64_t) next + 1) << data->log_blocksize)
+ - 1,
+ GRUB_DISK_SECTOR_SIZE - GRUB_AFFS_FILE_LOCATION,
+ sizeof (file), (char *) &file);
+ if (grub_errno)
+ goto fail;
+
+ if (grub_affs_create_node (dir, hook, hook_data, &node, &hashtable,
+ next, &file))
+ {
+ /* Node has been replaced in function. */
+ grub_free (orig_node);
+ return 1;
+ }
+
+ next = grub_be_to_cpu32 (file.next);
+ }
+ }
+
+ fail:
+ grub_free (orig_node);
+ grub_free (hashtable);
+ return 0;
+}
+
+
+/* Open a file named NAME and initialize FILE. */
+static grub_err_t
+grub_affs_open (struct grub_file *file, const char *name)
+{
+ struct grub_affs_data *data;
+ struct grub_fshelp_node *fdiro = 0;
+
+ grub_dl_ref (my_mod);
+
+ data = grub_affs_mount (file->device->disk);
+ if (!data)
+ goto fail;
+
+ grub_fshelp_find_file (name, &data->diropen, &fdiro, grub_affs_iterate_dir,
+ grub_affs_read_symlink, GRUB_FSHELP_REG);
+ if (grub_errno)
+ goto fail;
+
+ file->size = grub_be_to_cpu32 (fdiro->di.size);
+ data->diropen = *fdiro;
+ grub_free (fdiro);
+
+ file->data = data;
+ file->offset = 0;
+
+ return 0;
+
+ fail:
+ if (data && fdiro != &data->diropen)
+ grub_free (fdiro);
+ grub_free (data);
+
+ grub_dl_unref (my_mod);
+
+ return grub_errno;
+}
+
+static grub_err_t
+grub_affs_close (grub_file_t file)
+{
+ struct grub_affs_data *data =
+ (struct grub_affs_data *) file->data;
+
+ grub_free (data->diropen.block_cache);
+ grub_free (file->data);
+
+ grub_dl_unref (my_mod);
+
+ return GRUB_ERR_NONE;
+}
+
+/* Read LEN bytes data from FILE into BUF. */
+static grub_ssize_t
+grub_affs_read (grub_file_t file, char *buf, grub_size_t len)
+{
+ struct grub_affs_data *data =
+ (struct grub_affs_data *) file->data;
+
+ return grub_fshelp_read_file (data->diropen.data->disk, &data->diropen,
+ file->read_hook, file->read_hook_data,
+ file->offset, len, buf, grub_affs_read_block,
+ grub_be_to_cpu32 (data->diropen.di.size),
+ data->log_blocksize, 0);
+}
+
+static grub_int32_t
+aftime2ctime (const struct grub_affs_time *t)
+{
+ return grub_be_to_cpu32 (t->day) * 86400
+ + grub_be_to_cpu32 (t->min) * 60
+ + grub_be_to_cpu32 (t->hz) / 50
+ + 8 * 365 * 86400 + 86400 * 2;
+}
+
+/* Context for grub_affs_dir. */
+struct grub_affs_dir_ctx
+{
+ grub_fs_dir_hook_t hook;
+ void *hook_data;
+};
+
+/* Helper for grub_affs_dir. */
+static int
+grub_affs_dir_iter (const char *filename, enum grub_fshelp_filetype filetype,
+ grub_fshelp_node_t node, void *data)
+{
+ struct grub_affs_dir_ctx *ctx = data;
+ struct grub_dirhook_info info;
+
+ grub_memset (&info, 0, sizeof (info));
+ info.dir = ((filetype & GRUB_FSHELP_TYPE_MASK) == GRUB_FSHELP_DIR);
+ info.mtimeset = 1;
+ info.mtime = aftime2ctime (&node->di.mtime);
+ grub_free (node);
+ return ctx->hook (filename, &info, ctx->hook_data);
+}
+
+static grub_err_t
+grub_affs_dir (grub_device_t device, const char *path,
+ grub_fs_dir_hook_t hook, void *hook_data)
+{
+ struct grub_affs_dir_ctx ctx = { hook, hook_data };
+ struct grub_affs_data *data = 0;
+ struct grub_fshelp_node *fdiro = 0;
+
+ grub_dl_ref (my_mod);
+
+ data = grub_affs_mount (device->disk);
+ if (!data)
+ goto fail;
+
+ grub_fshelp_find_file (path, &data->diropen, &fdiro, grub_affs_iterate_dir,
+ grub_affs_read_symlink, GRUB_FSHELP_DIR);
+ if (grub_errno)
+ goto fail;
+
+ grub_affs_iterate_dir (fdiro, grub_affs_dir_iter, &ctx);
+
+ fail:
+ if (data && fdiro != &data->diropen)
+ grub_free (fdiro);
+ grub_free (data);
+
+ grub_dl_unref (my_mod);
+
+ return grub_errno;
+}
+
+
+static grub_err_t
+grub_affs_label (grub_device_t device, char **label)
+{
+ struct grub_affs_data *data;
+ struct grub_affs_file file;
+ grub_disk_t disk = device->disk;
+
+ grub_dl_ref (my_mod);
+
+ data = grub_affs_mount (disk);
+ if (data)
+ {
+ grub_size_t len;
+ /* The rootblock maps quite well on a file header block, it's
+ something we can use here. */
+ grub_disk_read (data->disk,
+ (((grub_uint64_t)
+ grub_be_to_cpu32 (data->bblock.rootblock) + 1)
+ << data->log_blocksize) - 1,
+ GRUB_DISK_SECTOR_SIZE - GRUB_AFFS_FILE_LOCATION,
+ sizeof (file), &file);
+ if (grub_errno)
+ return grub_errno;
+
+ len = file.namelen;
+ if (len > sizeof (file.name))
+ len = sizeof (file.name);
+ *label = grub_calloc (GRUB_MAX_UTF8_PER_LATIN1 + 1, len);
+ if (*label)
+ *grub_latin1_to_utf8 ((grub_uint8_t *) *label, file.name, len) = '\0';
+ }
+ else
+ *label = 0;
+
+ grub_dl_unref (my_mod);
+
+ grub_free (data);
+
+ return grub_errno;
+}
+
+static grub_err_t
+grub_affs_mtime (grub_device_t device, grub_int64_t *t)
+{
+ struct grub_affs_data *data;
+ grub_disk_t disk = device->disk;
+ struct grub_affs_time af_time;
+
+ *t = 0;
+
+ grub_dl_ref (my_mod);
+
+ data = grub_affs_mount (disk);
+ if (!data)
+ {
+ grub_dl_unref (my_mod);
+ return grub_errno;
+ }
+
+ grub_disk_read (data->disk,
+ (((grub_uint64_t)
+ grub_be_to_cpu32 (data->bblock.rootblock) + 1)
+ << data->log_blocksize) - 1,
+ GRUB_DISK_SECTOR_SIZE - 40,
+ sizeof (af_time), &af_time);
+ if (grub_errno)
+ {
+ grub_dl_unref (my_mod);
+ grub_free (data);
+ return grub_errno;
+ }
+
+ *t = aftime2ctime (&af_time);
+ grub_dl_unref (my_mod);
+
+ grub_free (data);
+
+ return GRUB_ERR_NONE;
+}
+
+
+static struct grub_fs grub_affs_fs =
+ {
+ .name = "affs",
+ .fs_dir = grub_affs_dir,
+ .fs_open = grub_affs_open,
+ .fs_read = grub_affs_read,
+ .fs_close = grub_affs_close,
+ .fs_label = grub_affs_label,
+ .fs_mtime = grub_affs_mtime,
+
+#ifdef GRUB_UTIL
+ .reserved_first_sector = 0,
+ .blocklist_install = 1,
+#endif
+ .next = 0
+ };
+
+GRUB_MOD_INIT(affs)
+{
+ grub_fs_register (&grub_affs_fs);
+ my_mod = mod;
+}
+
+GRUB_MOD_FINI(affs)
+{
+ grub_fs_unregister (&grub_affs_fs);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-18 14:07:56 +0000