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grub/fs/hfs.c

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/* hfs.c - HFS. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2004,2005,2006,2007,2008 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/>.
*/
/* HFS is documented at
http://developer.apple.com/documentation/mac/Files/Files-2.html */
#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/hfs.h>
#define GRUB_HFS_SBLOCK 2
#define GRUB_HFS_EMBED_HFSPLUS_SIG 0x482B
#define GRUB_HFS_BLKS (data->blksz >> 9)
#define GRUB_HFS_NODE_LEAF 0xFF
/* The two supported filesystems a record can have. */
enum
{
GRUB_HFS_FILETYPE_DIR = 1,
GRUB_HFS_FILETYPE_FILE = 2
};
/* Catalog node ID (CNID). */
enum grub_hfs_cnid_type
{
GRUB_HFS_CNID_ROOT_PARENT = 1,
GRUB_HFS_CNID_ROOT = 2,
GRUB_HFS_CNID_EXT = 3,
GRUB_HFS_CNID_CAT = 4,
GRUB_HFS_CNID_BAD = 5
};
/* A node descriptor. This is the header of every node. */
struct grub_hfs_node
{
grub_uint32_t next;
grub_uint32_t prev;
grub_uint8_t type;
grub_uint8_t level;
grub_uint16_t reccnt;
grub_uint16_t unused;
} __attribute__ ((packed));
/* The head of the B*-Tree. */
struct grub_hfs_treeheader
{
grub_uint16_t tree_depth;
/* The number of the first node. */
grub_uint32_t root_node;
grub_uint32_t leaves;
grub_uint32_t first_leaf;
grub_uint32_t last_leaf;
grub_uint16_t node_size;
grub_uint16_t key_size;
grub_uint32_t nodes;
grub_uint32_t free_nodes;
grub_uint8_t unused[76];
} __attribute__ ((packed));
/* The state of a mounted HFS filesystem. */
struct grub_hfs_data
{
struct grub_hfs_sblock sblock;
grub_disk_t disk;
grub_hfs_datarecord_t extents;
int fileid;
int size;
int ext_root;
int ext_size;
int cat_root;
int cat_size;
int blksz;
int log2_blksz;
int rootdir;
};
/* The key as used on disk in a catalog tree. This is used to lookup
file/directory nodes by parent directory ID and filename. */
struct grub_hfs_catalog_key
{
grub_uint8_t unused;
grub_uint32_t parent_dir;
/* Filename length. */
grub_uint8_t strlen;
/* Filename. */
grub_uint8_t str[31];
} __attribute__ ((packed));
/* The key as used on disk in a extent overflow tree. Using this key
the extents can be looked up using a fileid and logical start block
as index. */
struct grub_hfs_extent_key
{
/* The kind of fork. This is used to store meta information like
icons, attributes, etc. We will only use the datafork, which is
0. */
grub_uint8_t forktype;
grub_uint32_t fileid;
grub_uint16_t first_block;
} __attribute__ ((packed));
/* A directory record. This is used to find out the directory ID. */
struct grub_hfs_dirrec
{
/* For a directory, type == 1. */
grub_uint8_t type;
grub_uint8_t unused[5];
grub_uint32_t dirid;
} __attribute__ ((packed));
/* Information about a file. */
struct grub_hfs_filerec
{
/* For a file, type == 2. */
grub_uint8_t type;
grub_uint8_t unused[19];
grub_uint32_t fileid;
grub_uint8_t unused2[2];
grub_uint32_t size;
grub_uint8_t unused3[44];
/* The first 3 extents of the file. The other extents can be found
in the extent overflow file. */
grub_hfs_datarecord_t extents;
} __attribute__ ((packed));
/* A record descriptor, both key and data, used to pass to call back
functions. */
struct grub_hfs_record
{
void *key;
int keylen;
void *data;
int datalen;
};
static grub_dl_t my_mod;
static int grub_hfs_find_node (struct grub_hfs_data *, char *,
grub_uint32_t, int, char *, int);
/* Find block BLOCK of the file FILE in the mounted UFS filesystem
DATA. The first 3 extents are described by DAT. If cache is set,
using caching to improve non-random reads. */
static unsigned int
grub_hfs_block (struct grub_hfs_data *data, grub_hfs_datarecord_t dat,
int file, int block, int cache)
{
grub_hfs_datarecord_t dr;
int pos = 0;
struct grub_hfs_extent_key key;
int tree = 0;
static int cache_file = 0;
static int cache_pos = 0;
static grub_hfs_datarecord_t cache_dr;
grub_memcpy (dr, dat, sizeof (dr));
key.forktype = 0;
key.fileid = grub_cpu_to_be32 (file);
if (cache && cache_file == file && block > cache_pos)
{
pos = cache_pos;
key.first_block = grub_cpu_to_be16 (pos);
grub_memcpy (dr, cache_dr, sizeof (cache_dr));
}
for (;;)
{
int i;
/* Try all 3 extents. */
for (i = 0; i < 3; i++)
{
/* Check if the block is stored in this extent. */
if (grub_be_to_cpu16 (dr[i].count) + pos > block)
{
int first = grub_be_to_cpu16 (dr[i].first_block);
/* If the cache is enabled, store the current position
in the tree. */
if (tree && cache)
{
cache_file = file;
cache_pos = pos;
grub_memcpy (cache_dr, dr, sizeof (cache_dr));
}
return (grub_be_to_cpu16 (data->sblock.first_block)
+ (first + block - pos) * GRUB_HFS_BLKS);
}
/* Try the next extent. */
pos += grub_be_to_cpu16 (dr[i].count);
}
/* Lookup the block in the extent overflow file. */
key.first_block = grub_cpu_to_be16 (pos);
tree = 1;
grub_hfs_find_node (data, (char *) &key, data->ext_root,
1, (char *) &dr, sizeof (dr));
if (grub_errno)
return 0;
}
}
/* Read LEN bytes from the file described by DATA starting with byte
POS. Return the amount of read bytes in READ. */
static grub_ssize_t
grub_hfs_read_file (struct grub_hfs_data *data,
void NESTED_FUNC_ATTR (*read_hook) (grub_disk_addr_t sector,
unsigned offset, unsigned length),
int pos, grub_size_t len, char *buf)
{
int i;
int blockcnt;
/* Adjust len so it we can't read past the end of the file. */
if (len > grub_le_to_cpu32 (data->size))
len = grub_le_to_cpu32 (data->size);
blockcnt = ((len + pos)
+ data->blksz - 1) / data->blksz;
for (i = pos / data->blksz; i < blockcnt; i++)
{
int blknr;
int blockoff = pos % data->blksz;
int blockend = data->blksz;
int skipfirst = 0;
blknr = grub_hfs_block (data, data->extents, data->fileid, i, 1);
if (grub_errno)
return -1;
/* Last block. */
if (i == blockcnt - 1)
{
blockend = (len + pos) % data->blksz;
/* The last portion is exactly EXT2_BLOCK_SIZE (data). */
if (! blockend)
blockend = data->blksz;
}
/* First block. */
if (i == pos / data->blksz)
{
skipfirst = blockoff;
blockend -= skipfirst;
}
/* If the block number is 0 this block is not stored on disk but
is zero filled instead. */
if (blknr)
{
data->disk->read_hook = read_hook;
grub_disk_read (data->disk, blknr, skipfirst,
blockend, buf);
data->disk->read_hook = 0;
if (grub_errno)
return -1;
}
buf += data->blksz - skipfirst;
}
return len;
}
/* Mount the filesystem on the disk DISK. */
static struct grub_hfs_data *
grub_hfs_mount (grub_disk_t disk)
{
struct grub_hfs_data *data;
struct grub_hfs_catalog_key key;
struct grub_hfs_dirrec dir;
int first_block;
struct
{
struct grub_hfs_node node;
struct grub_hfs_treeheader head;
} treehead;
data = grub_malloc (sizeof (struct grub_hfs_data));
if (!data)
return 0;
/* Read the superblock. */
if (grub_disk_read (disk, GRUB_HFS_SBLOCK, 0,
sizeof (struct grub_hfs_sblock), &data->sblock))
goto fail;
/* Check if this is a HFS filesystem. */
if (grub_be_to_cpu16 (data->sblock.magic) != GRUB_HFS_MAGIC)
{
grub_error (GRUB_ERR_BAD_FS, "not an HFS filesystem");
goto fail;
}
/* Check if this is an embedded HFS+ filesystem. */
if (grub_be_to_cpu16 (data->sblock.embed_sig) == GRUB_HFS_EMBED_HFSPLUS_SIG)
{
grub_error (GRUB_ERR_BAD_FS, "embedded HFS+ filesystem");
goto fail;
}
data->blksz = grub_be_to_cpu32 (data->sblock.blksz);
data->disk = disk;
/* Lookup the root node of the extent overflow tree. */
first_block = ((grub_be_to_cpu16 (data->sblock.extent_recs[0].first_block)
* GRUB_HFS_BLKS)
+ grub_be_to_cpu16 (data->sblock.first_block));
if (grub_disk_read (data->disk, first_block, 0,
sizeof (treehead), &treehead))
goto fail;
data->ext_root = grub_be_to_cpu32 (treehead.head.root_node);
data->ext_size = grub_be_to_cpu16 (treehead.head.node_size);
/* Lookup the root node of the catalog tree. */
first_block = ((grub_be_to_cpu16 (data->sblock.catalog_recs[0].first_block)
* GRUB_HFS_BLKS)
+ grub_be_to_cpu16 (data->sblock.first_block));
if (grub_disk_read (data->disk, first_block, 0,
sizeof (treehead), &treehead))
goto fail;
data->cat_root = grub_be_to_cpu32 (treehead.head.root_node);
data->cat_size = grub_be_to_cpu16 (treehead.head.node_size);
/* Lookup the root directory node in the catalog tree using the
volume name. */
key.parent_dir = grub_cpu_to_be32 (1);
key.strlen = data->sblock.volname[0];
grub_strcpy ((char *) key.str, (char *) (data->sblock.volname + 1));
if (grub_hfs_find_node (data, (char *) &key, data->cat_root,
0, (char *) &dir, sizeof (dir)) == 0)
{
grub_error (GRUB_ERR_BAD_FS, "can not find the hfs root directory");
goto fail;
}
if (grub_errno)
goto fail;
data->rootdir = grub_be_to_cpu32 (dir.dirid);
return data;
fail:
grub_free (data);
if (grub_errno == GRUB_ERR_OUT_OF_RANGE)
grub_error (GRUB_ERR_BAD_FS, "not a hfs filesystem");
return 0;
}
/* Compare the K1 and K2 catalog file keys using HFS character ordering. */
static int
grub_hfs_cmp_catkeys (struct grub_hfs_catalog_key *k1,
struct grub_hfs_catalog_key *k2)
{
/* Taken from hfsutils 3.2.6 and converted to a readable form */
static const unsigned char hfs_charorder[256] = {
[0x00] = 0,
[0x01] = 1,
[0x02] = 2,
[0x03] = 3,
[0x04] = 4,
[0x05] = 5,
[0x06] = 6,
[0x07] = 7,
[0x08] = 8,
[0x09] = 9,
[0x0A] = 10,
[0x0B] = 11,
[0x0C] = 12,
[0x0D] = 13,
[0x0E] = 14,
[0x0F] = 15,
[0x10] = 16,
[0x11] = 17,
[0x12] = 18,
[0x13] = 19,
[0x14] = 20,
[0x15] = 21,
[0x16] = 22,
[0x17] = 23,
[0x18] = 24,
[0x19] = 25,
[0x1A] = 26,
[0x1B] = 27,
[0x1C] = 28,
[0x1D] = 29,
[0x1E] = 30,
[0x1F] = 31,
[' '] = 32, [0xCA] = 32,
['!'] = 33,
['"'] = 34,
[0xD2] = 35,
[0xD3] = 36,
[0xC7] = 37,
[0xC8] = 38,
['#'] = 39,
['$'] = 40,
['%'] = 41,
['&'] = 42,
['\''] = 43,
[0xD4] = 44,
[0xD5] = 45,
['('] = 46,
[')'] = 47,
['*'] = 48,
['+'] = 49,
[','] = 50,
['-'] = 51,
['.'] = 52,
['/'] = 53,
['0'] = 54,
['1'] = 55,
['2'] = 56,
['3'] = 57,
['4'] = 58,
['5'] = 59,
['6'] = 60,
['7'] = 61,
['8'] = 62,
['9'] = 63,
[':'] = 64,
[';'] = 65,
['<'] = 66,
['='] = 67,
['>'] = 68,
['?'] = 69,
['@'] = 70,
['A'] = 71, ['a'] = 71,
[0x88] = 72, [0xCB] = 72,
[0x80] = 73, [0x8A] = 73,
[0x8B] = 74, [0xCC] = 74,
[0x81] = 75, [0x8C] = 75,
[0xAE] = 76, [0xBE] = 76,
['`'] = 77,
[0x87] = 78,
[0x89] = 79,
[0xBB] = 80,
['B'] = 81, ['b'] = 81,
['C'] = 82, ['c'] = 82,
[0x82] = 83, [0x8D] = 83,
['D'] = 84, ['d'] = 84,
['E'] = 85, ['e'] = 85,
[0x83] = 86, [0x8E] = 86,
[0x8F] = 87,
[0x90] = 88,
[0x91] = 89,
['F'] = 90, ['f'] = 90,
['G'] = 91, ['g'] = 91,
['H'] = 92, ['h'] = 92,
['I'] = 93, ['i'] = 93,
[0x92] = 94,
[0x93] = 95,
[0x94] = 96,
[0x95] = 97,
['J'] = 98, ['j'] = 98,
['K'] = 99, ['k'] = 99,
['L'] = 100, ['l'] = 100,
['M'] = 101, ['m'] = 101,
['N'] = 102, ['n'] = 102,
[0x84] = 103, [0x96] = 103,
['O'] = 104, ['o'] = 104,
[0x85] = 105, [0x9A] = 105,
[0x9B] = 106, [0xCD] = 106,
[0xAF] = 107, [0xBF] = 107,
[0xCE] = 108, [0xCF] = 108,
[0x97] = 109,
[0x98] = 110,
[0x99] = 111,
[0xBC] = 112,
['P'] = 113, ['p'] = 113,
['Q'] = 114, ['q'] = 114,
['R'] = 115, ['r'] = 115,
['S'] = 116, ['s'] = 116,
[0xA7] = 117,
['T'] = 118, ['t'] = 118,
['U'] = 119, ['u'] = 119,
[0x86] = 120, [0x9F] = 120,
[0x9C] = 121,
[0x9D] = 122,
[0x9E] = 123,
['V'] = 124, ['v'] = 124,
['W'] = 125, ['w'] = 125,
['X'] = 126, ['x'] = 126,
['Y'] = 127, ['y'] = 127,
[0xD8] = 128,
['Z'] = 129, ['z'] = 129,
['['] = 130,
['\\'] = 131,
[']'] = 132,
['^'] = 133,
['_'] = 134,
['{'] = 135,
['|'] = 136,
['}'] = 137,
['~'] = 138,
[0x7F] = 139,
[0xA0] = 140,
[0xA1] = 141,
[0xA2] = 142,
[0xA3] = 143,
[0xA4] = 144,
[0xA5] = 145,
[0xA6] = 146,
[0xA8] = 147,
[0xA9] = 148,
[0xAA] = 149,
[0xAB] = 150,
[0xAC] = 151,
[0xAD] = 152,
[0xB0] = 153,
[0xB1] = 154,
[0xB2] = 155,
[0xB3] = 156,
[0xB4] = 157,
[0xB5] = 158,
[0xB6] = 159,
[0xB7] = 160,
[0xB8] = 161,
[0xB9] = 162,
[0xBA] = 163,
[0xBD] = 164,
[0xC0] = 165,
[0xC1] = 166,
[0xC2] = 167,
[0xC3] = 168,
[0xC4] = 169,
[0xC5] = 170,
[0xC6] = 171,
[0xC9] = 172,
[0xD0] = 173,
[0xD1] = 174,
[0xD6] = 175,
[0xD7] = 176,
[0xD9] = 177,
[0xDA] = 178,
[0xDB] = 179,
[0xDC] = 180,
[0xDD] = 181,
[0xDE] = 182,
[0xDF] = 183,
[0xE0] = 184,
[0xE1] = 185,
[0xE2] = 186,
[0xE3] = 187,
[0xE4] = 188,
[0xE5] = 189,
[0xE6] = 190,
[0xE7] = 191,
[0xE8] = 192,
[0xE9] = 193,
[0xEA] = 194,
[0xEB] = 195,
[0xEC] = 196,
[0xED] = 197,
[0xEE] = 198,
[0xEF] = 199,
[0xF0] = 200,
[0xF1] = 201,
[0xF2] = 202,
[0xF3] = 203,
[0xF4] = 204,
[0xF5] = 205,
[0xF6] = 206,
[0xF7] = 207,
[0xF8] = 208,
[0xF9] = 209,
[0xFA] = 210,
[0xFB] = 211,
[0xFC] = 212,
[0xFD] = 213,
[0xFE] = 214,
[0xFF] = 215,
};
int i;
int cmp;
int minlen = (k1->strlen < k2->strlen) ? k1->strlen : k2->strlen;
cmp = (grub_be_to_cpu32 (k1->parent_dir) - grub_be_to_cpu32 (k2->parent_dir));
if (cmp != 0)
return cmp;
for (i = 0; i < minlen; i++)
{
cmp = (hfs_charorder[k1->str[i]] - hfs_charorder[k2->str[i]]);
if (cmp != 0)
return cmp;
}
/* Shorter strings precede long ones. */
return (k1->strlen - k2->strlen);
}
/* Compare the K1 and K2 extent overflow file keys. */
static int
grub_hfs_cmp_extkeys (struct grub_hfs_extent_key *k1,
struct grub_hfs_extent_key *k2)
{
int cmp = k1->forktype - k2->forktype;
if (cmp == 0)
cmp = grub_be_to_cpu32 (k1->fileid) - grub_be_to_cpu32 (k2->fileid);
if (cmp == 0)
cmp = (grub_be_to_cpu16 (k1->first_block)
- grub_be_to_cpu16 (k2->first_block));
return cmp;
}
/* Iterate the records in the node with index IDX in the mounted HFS
filesystem DATA. This node holds data of the type TYPE (0 =
catalog node, 1 = extent overflow node). If this is set, continue
iterating to the next node. For every records, call NODE_HOOK. */
static grub_err_t
grub_hfs_iterate_records (struct grub_hfs_data *data, int type, int idx,
int this, int (*node_hook) (struct grub_hfs_node *hnd,
struct grub_hfs_record *))
{
int nodesize = type == 0 ? data->cat_size : data->ext_size;
union
{
struct grub_hfs_node node;
char rawnode[nodesize];
grub_uint16_t offsets[nodesize / 2];
} node;
do
{
int i;
struct grub_hfs_extent *dat;
int blk;
dat = (struct grub_hfs_extent *) (type == 0
? (&data->sblock.catalog_recs)
: (&data->sblock.extent_recs));
/* Read the node into memory. */
blk = grub_hfs_block (data, dat,
(type == 0) ? GRUB_HFS_CNID_CAT : GRUB_HFS_CNID_EXT,
idx / (data->blksz / nodesize), 0);
blk += (idx % (data->blksz / nodesize));
if (grub_errno)
return grub_errno;
if (grub_disk_read (data->disk, blk, 0,
sizeof (node), &node))
return grub_errno;
/* Iterate over all records in this node. */
for (i = 0; i < grub_be_to_cpu16 (node.node.reccnt); i++)
{
int pos = (nodesize >> 1) - 1 - i;
struct pointer
{
grub_uint8_t keylen;
grub_uint8_t key;
} __attribute__ ((packed)) *pnt;
pnt = (struct pointer *) (grub_be_to_cpu16 (node.offsets[pos])
+ node.rawnode);
struct grub_hfs_record rec =
{
&pnt->key,
pnt->keylen,
&pnt->key + pnt->keylen +(pnt->keylen + 1) % 2,
nodesize - grub_be_to_cpu16 (node.offsets[pos])
- pnt->keylen - 1
};
if (node_hook (&node.node, &rec))
return 0;
}
idx = grub_be_to_cpu32 (node.node.next);
} while (idx && this);
return 0;
}
/* Lookup a record in the mounted filesystem DATA using the key KEY.
The index of the node on top of the tree is IDX. The tree is of
the type TYPE (0 = catalog node, 1 = extent overflow node). Return
the data in DATAR with a maximum length of DATALEN. */
static int
grub_hfs_find_node (struct grub_hfs_data *data, char *key,
grub_uint32_t idx, int type, char *datar, int datalen)
{
int found = -1;
int isleaf = 0;
int done = 0;
auto int node_found (struct grub_hfs_node *, struct grub_hfs_record *);
int node_found (struct grub_hfs_node *hnd, struct grub_hfs_record *rec)
{
int cmp = 1;
if (type == 0)
cmp = grub_hfs_cmp_catkeys (rec->key, (void *) key);
else
cmp = grub_hfs_cmp_extkeys (rec->key, (void *) key);
/* If the key is smaller or equal to the current node, mark the
entry. In case of a non-leaf mode it will be used to lookup
the rest of the tree. */
if (cmp <= 0)
{
grub_uint32_t *node = (grub_uint32_t *) rec->data;
found = grub_be_to_cpu32 (*node);
}
else /* The key can not be found in the tree. */
return 1;
/* Check if this node is a leaf node. */
if (hnd->type == GRUB_HFS_NODE_LEAF)
{
isleaf = 1;
/* Found it!!!! */
if (cmp == 0)
{
done = 1;
grub_memcpy (datar, rec->data,
rec->datalen < datalen ? rec->datalen : datalen);
return 1;
}
}
return 0;
}
do
{
found = -1;
if (grub_hfs_iterate_records (data, type, idx, 0, node_found))
return 0;
if (found == -1)
return 0;
idx = found;
} while (! isleaf);
return done;
}
/* Iterate over the directory with the id DIR. The tree is searched
starting with the node ROOT_IDX. For every entry in this directory
call HOOK. */
static grub_err_t
grub_hfs_iterate_dir (struct grub_hfs_data *data, grub_uint32_t root_idx,
unsigned int dir, int (*hook) (struct grub_hfs_record *))
{
int found = -1;
int isleaf = 0;
int next = 0;
/* The lowest key possible with DIR as root directory. */
struct grub_hfs_catalog_key key = {0, grub_cpu_to_be32 (dir), 0, ""};
auto int node_found (struct grub_hfs_node *, struct grub_hfs_record *);
auto int it_dir (struct grub_hfs_node * __attribute ((unused)),
struct grub_hfs_record *);
int node_found (struct grub_hfs_node *hnd, struct grub_hfs_record *rec)
{
struct grub_hfs_catalog_key *ckey = rec->key;
if (grub_hfs_cmp_catkeys (rec->key, (void *) &key) <= 0)
found = grub_be_to_cpu32 (*(grub_uint32_t *) rec->data);
if (hnd->type == 0xFF && ckey->strlen > 0)
{
isleaf = 1;
next = grub_be_to_cpu32 (hnd->next);
/* An entry was found. */
if (grub_be_to_cpu32 (ckey->parent_dir) == dir)
return hook (rec);
}
return 0;
}
int it_dir (struct grub_hfs_node *hnd __attribute ((unused)),
struct grub_hfs_record *rec)
{
struct grub_hfs_catalog_key *ckey = rec->key;
struct grub_hfs_catalog_key *origkey = &key;
/* Stop when the entries do not match anymore. */
if (grub_be_to_cpu32 (ckey->parent_dir)
!= grub_be_to_cpu32 ((origkey)->parent_dir))
return 1;
return hook (rec);
}
do
{
found = -1;
if (grub_hfs_iterate_records (data, 0, root_idx, 0, node_found))
return grub_errno;
if (found == -1)
return 0;
root_idx = found;
} while (! isleaf);
/* If there was a matching record in this leaf node, continue the
iteration until the last record was found. */
grub_hfs_iterate_records (data, 0, next, 1, it_dir);
return grub_errno;
}
/* Find a file or directory with the pathname PATH in the filesystem
DATA. Return the file record in RETDATA when it is non-zero.
Return the directory number in RETINODE when it is non-zero. */
static grub_err_t
grub_hfs_find_dir (struct grub_hfs_data *data, const char *path,
struct grub_hfs_filerec *retdata, int *retinode)
{
int inode = data->rootdir;
char *next;
char *origpath;
union {
struct grub_hfs_filerec frec;
struct grub_hfs_dirrec dir;
} fdrec;
fdrec.frec.type = GRUB_HFS_FILETYPE_DIR;
if (path[0] != '/')
{
grub_error (GRUB_ERR_BAD_FILENAME, "bad filename");
return 0;
}
origpath = grub_strdup (path);
if (!origpath)
return grub_errno;
path = origpath;
while (*path == '/')
path++;
while (path && grub_strlen (path))
{
if (fdrec.frec.type != GRUB_HFS_FILETYPE_DIR)
{
grub_error (GRUB_ERR_BAD_FILE_TYPE, "not a directory");
goto fail;
}
/* Isolate a part of the path. */
next = grub_strchr (path, '/');
if (next)
{
while (*next == '/')
*(next++) = '\0';
}
struct grub_hfs_catalog_key key;
key.parent_dir = grub_cpu_to_be32 (inode);
key.strlen = grub_strlen (path);
grub_strcpy ((char *) (key.str), path);
/* Lookup this node. */
if (! grub_hfs_find_node (data, (char *) &key, data->cat_root,
0, (char *) &fdrec.frec, sizeof (fdrec.frec)))
{
grub_error (GRUB_ERR_FILE_NOT_FOUND, "file not found");
goto fail;
}
if (grub_errno)
goto fail;
inode = grub_be_to_cpu32 (fdrec.dir.dirid);
path = next;
}
if (retdata)
grub_memcpy (retdata, &fdrec.frec, sizeof (fdrec.frec));
if (retinode)
*retinode = inode;
fail:
grub_free (origpath);
return grub_errno;
}
static grub_err_t
grub_hfs_dir (grub_device_t device, const char *path,
int (*hook) (const char *filename,
const struct grub_dirhook_info *info))
{
int inode;
auto int dir_hook (struct grub_hfs_record *rec);
int dir_hook (struct grub_hfs_record *rec)
{
char fname[32] = { 0 };
char *filetype = rec->data;
struct grub_hfs_catalog_key *ckey = rec->key;
struct grub_dirhook_info info;
grub_memset (&info, 0, sizeof (info));
grub_strncpy (fname, (char *) (ckey->str), ckey->strlen);
if (*filetype == GRUB_HFS_FILETYPE_DIR
|| *filetype == GRUB_HFS_FILETYPE_FILE)
{
info.dir = (*filetype == GRUB_HFS_FILETYPE_DIR);
return hook (fname, &info);
}
return 0;
}
struct grub_hfs_data *data;
struct grub_hfs_filerec frec;
grub_dl_ref (my_mod);
data = grub_hfs_mount (device->disk);
if (!data)
goto fail;
/* First the directory ID for the directory. */
if (grub_hfs_find_dir (data, path, &frec, &inode))
goto fail;
if (frec.type != GRUB_HFS_FILETYPE_DIR)
{
grub_error (GRUB_ERR_BAD_FILE_TYPE, "not a directory");
goto fail;
}
grub_hfs_iterate_dir (data, data->cat_root, inode, dir_hook);
fail:
grub_free (data);
grub_dl_unref (my_mod);
return grub_errno;
}
/* Open a file named NAME and initialize FILE. */
static grub_err_t
grub_hfs_open (struct grub_file *file, const char *name)
{
struct grub_hfs_data *data;
struct grub_hfs_filerec frec;
grub_dl_ref (my_mod);
data = grub_hfs_mount (file->device->disk);
if (grub_hfs_find_dir (data, name, &frec, 0))
{
grub_free (data);
grub_dl_unref (my_mod);
return grub_errno;
}
if (frec.type != GRUB_HFS_FILETYPE_FILE)
{
grub_free (data);
grub_error (GRUB_ERR_BAD_FILE_TYPE, "not a file");
grub_dl_unref (my_mod);
return grub_errno;
}
grub_memcpy (data->extents, frec.extents, sizeof (grub_hfs_datarecord_t));
file->size = grub_be_to_cpu32 (frec.size);
data->size = grub_be_to_cpu32 (frec.size);
data->fileid = grub_be_to_cpu32 (frec.fileid);
file->offset = 0;
file->data = data;
return 0;
}
static grub_ssize_t
grub_hfs_read (grub_file_t file, char *buf, grub_size_t len)
{
struct grub_hfs_data *data =
(struct grub_hfs_data *) file->data;
return grub_hfs_read_file (data, file->read_hook, file->offset, len, buf);
}
static grub_err_t
grub_hfs_close (grub_file_t file)
{
grub_free (file->data);
grub_dl_unref (my_mod);
return 0;
}
static grub_err_t
grub_hfs_label (grub_device_t device, char **label)
{
struct grub_hfs_data *data;
data = grub_hfs_mount (device->disk);
if (data)
*label = grub_strndup ((char *) (data->sblock.volname + 1),
*data->sblock.volname);
else
*label = 0;
grub_free (data);
return grub_errno;
}
static struct grub_fs grub_hfs_fs =
{
.name = "hfs",
.dir = grub_hfs_dir,
.open = grub_hfs_open,
.read = grub_hfs_read,
.close = grub_hfs_close,
.label = grub_hfs_label,
.next = 0
};
GRUB_MOD_INIT(hfs)
{
grub_fs_register (&grub_hfs_fs);
my_mod = mod;
}
GRUB_MOD_FINI(hfs)
{
grub_fs_unregister (&grub_hfs_fs);
}
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