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grub/grub-core/fs/ntfs.c
Vladimir 'phcoder' Serbinenko 033d0b4b0b * grub-core/fs/ntfs.c: Eliminate useless divisions in favor of shifts. 
* grub-core/fs/ntfscomp.c: Likewise.
	* include/grub/ntfs.h (grub_ntfs_data): Replace spc with log_spc.
	(grub_ntfs_comp): Likewise.
2013-01-05 17:36:04 +01:00

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/* ntfs.c - NTFS filesystem */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2007,2008,2009 Free Software Foundation, Inc.
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define grub_fshelp_node grub_ntfs_file
#include <grub/file.h>
#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/disk.h>
#include <grub/dl.h>
#include <grub/fshelp.h>
#include <grub/ntfs.h>
#include <grub/charset.h>
GRUB_MOD_LICENSE ("GPLv3+");
static grub_dl_t my_mod;
#define grub_fshelp_node grub_ntfs_file
static inline grub_uint16_t
u16at (void *ptr, grub_size_t ofs)
{
return grub_le_to_cpu16 (grub_get_unaligned16 ((char *) ptr + ofs));
}
static inline grub_uint32_t
u32at (void *ptr, grub_size_t ofs)
{
return grub_le_to_cpu32 (grub_get_unaligned32 ((char *) ptr + ofs));
}
static inline grub_uint64_t
u64at (void *ptr, grub_size_t ofs)
{
return grub_le_to_cpu64 (grub_get_unaligned64 ((char *) ptr + ofs));
}
grub_ntfscomp_func_t grub_ntfscomp_func;
static grub_err_t
fixup (char *buf, int len, const char *magic)
{
int ss;
char *pu;
grub_uint16_t us;
COMPILE_TIME_ASSERT ((1 << GRUB_NTFS_BLK_SHR) == GRUB_DISK_SECTOR_SIZE);
if (grub_memcmp (buf, magic, 4))
return grub_error (GRUB_ERR_BAD_FS, "%s label not found", magic);
ss = u16at (buf, 6) - 1;
if (ss != len)
return grub_error (GRUB_ERR_BAD_FS, "size not match");
pu = buf + u16at (buf, 4);
us = u16at (pu, 0);
buf -= 2;
while (ss > 0)
{
buf += GRUB_DISK_SECTOR_SIZE;
pu += 2;
if (u16at (buf, 0) != us)
return grub_error (GRUB_ERR_BAD_FS, "fixup signature not match");
buf[0] = pu[0];
buf[1] = pu[1];
ss--;
}
return 0;
}
static grub_err_t read_mft (struct grub_ntfs_data *data, char *buf,
grub_uint32_t mftno);
static grub_err_t read_attr (struct grub_ntfs_attr *at, char *dest,
grub_disk_addr_t ofs, grub_size_t len,
int cached,
void
NESTED_FUNC_ATTR (*read_hook) (grub_disk_addr_t
sector,
unsigned offset,
unsigned length));
static grub_err_t read_data (struct grub_ntfs_attr *at, char *pa, char *dest,
grub_disk_addr_t ofs, grub_size_t len,
int cached,
void
NESTED_FUNC_ATTR (*read_hook) (grub_disk_addr_t
sector,
unsigned offset,
unsigned length));
static void
init_attr (struct grub_ntfs_attr *at, struct grub_ntfs_file *mft)
{
at->mft = mft;
at->flags = (mft == &mft->data->mmft) ? GRUB_NTFS_AF_MMFT : 0;
at->attr_nxt = mft->buf + u16at (mft->buf, 0x14);
at->attr_end = at->emft_buf = at->edat_buf = at->sbuf = NULL;
}
static void
free_attr (struct grub_ntfs_attr *at)
{
grub_free (at->emft_buf);
grub_free (at->edat_buf);
grub_free (at->sbuf);
}
static char *
find_attr (struct grub_ntfs_attr *at, unsigned char attr)
{
if (at->flags & GRUB_NTFS_AF_ALST)
{
retry:
while (at->attr_nxt < at->attr_end)
{
at->attr_cur = at->attr_nxt;
at->attr_nxt += u16at (at->attr_cur, 4);
if (((unsigned char) *at->attr_cur == attr) || (attr == 0))
{
char *new_pos;
if (at->flags & GRUB_NTFS_AF_MMFT)
{
if ((grub_disk_read
(at->mft->data->disk, u32at (at->attr_cur, 0x10), 0,
512, at->emft_buf))
||
(grub_disk_read
(at->mft->data->disk, u32at (at->attr_cur, 0x14), 0,
512, at->emft_buf + 512)))
return NULL;
if (fixup (at->emft_buf, at->mft->data->mft_size, "FILE"))
return NULL;
}
else
{
if (read_mft (at->mft->data, at->emft_buf,
u32at (at->attr_cur, 0x10)))
return NULL;
}
new_pos = &at->emft_buf[u16at (at->emft_buf, 0x14)];
while ((unsigned char) *new_pos != 0xFF)
{
if (((unsigned char) *new_pos ==
(unsigned char) *at->attr_cur)
&& (u16at (new_pos, 0xE) == u16at (at->attr_cur, 0x18)))
{
return new_pos;
}
new_pos += u16at (new_pos, 4);
}
grub_error (GRUB_ERR_BAD_FS,
"can\'t find 0x%X in attribute list",
(unsigned char) *at->attr_cur);
return NULL;
}
}
return NULL;
}
at->attr_cur = at->attr_nxt;
while ((unsigned char) *at->attr_cur != 0xFF)
{
at->attr_nxt += u16at (at->attr_cur, 4);
if ((unsigned char) *at->attr_cur == GRUB_NTFS_AT_ATTRIBUTE_LIST)
at->attr_end = at->attr_cur;
if (((unsigned char) *at->attr_cur == attr) || (attr == 0))
return at->attr_cur;
at->attr_cur = at->attr_nxt;
}
if (at->attr_end)
{
char *pa;
at->emft_buf = grub_malloc (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR);
if (at->emft_buf == NULL)
return NULL;
pa = at->attr_end;
if (pa[8])
{
int n;
n = ((u32at (pa, 0x30) + GRUB_DISK_SECTOR_SIZE - 1)
& (~(GRUB_DISK_SECTOR_SIZE - 1)));
at->attr_cur = at->attr_end;
at->edat_buf = grub_malloc (n);
if (!at->edat_buf)
return NULL;
if (read_data (at, pa, at->edat_buf, 0, n, 0, 0))
{
grub_error (GRUB_ERR_BAD_FS,
"fail to read non-resident attribute list");
return NULL;
}
at->attr_nxt = at->edat_buf;
at->attr_end = at->edat_buf + u32at (pa, 0x30);
}
else
{
at->attr_nxt = at->attr_end + u16at (pa, 0x14);
at->attr_end = at->attr_end + u32at (pa, 4);
}
at->flags |= GRUB_NTFS_AF_ALST;
while (at->attr_nxt < at->attr_end)
{
if (((unsigned char) *at->attr_nxt == attr) || (attr == 0))
break;
at->attr_nxt += u16at (at->attr_nxt, 4);
}
if (at->attr_nxt >= at->attr_end)
return NULL;
if ((at->flags & GRUB_NTFS_AF_MMFT) && (attr == GRUB_NTFS_AT_DATA))
{
at->flags |= GRUB_NTFS_AF_GPOS;
at->attr_cur = at->attr_nxt;
pa = at->attr_cur;
grub_set_unaligned32 ((char *) pa + 0x10,
grub_cpu_to_le32 (at->mft->data->mft_start));
grub_set_unaligned32 ((char *) pa + 0x14,
grub_cpu_to_le32 (at->mft->data->mft_start
+ 1));
pa = at->attr_nxt + u16at (pa, 4);
while (pa < at->attr_end)
{
if ((unsigned char) *pa != attr)
break;
if (read_attr
(at, pa + 0x10,
u32at (pa, 0x10) * (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR),
at->mft->data->mft_size << GRUB_NTFS_BLK_SHR, 0, 0))
return NULL;
pa += u16at (pa, 4);
}
at->attr_nxt = at->attr_cur;
at->flags &= ~GRUB_NTFS_AF_GPOS;
}
goto retry;
}
return NULL;
}
static char *
locate_attr (struct grub_ntfs_attr *at, struct grub_ntfs_file *mft,
unsigned char attr)
{
char *pa;
init_attr (at, mft);
pa = find_attr (at, attr);
if (pa == NULL)
return NULL;
if ((at->flags & GRUB_NTFS_AF_ALST) == 0)
{
while (1)
{
pa = find_attr (at, attr);
if (pa == NULL)
break;
if (at->flags & GRUB_NTFS_AF_ALST)
return pa;
}
grub_errno = GRUB_ERR_NONE;
free_attr (at);
init_attr (at, mft);
pa = find_attr (at, attr);
}
return pa;
}
static char *
read_run_data (char *run, int nn, grub_disk_addr_t * val, int sig)
{
grub_disk_addr_t r, v;
r = 0;
v = 1;
while (nn--)
{
r += v * (*(unsigned char *) (run++));
v <<= 8;
}
if ((sig) && (r & (v >> 1)))
r -= v;
*val = r;
return run;
}
grub_err_t
grub_ntfs_read_run_list (struct grub_ntfs_rlst * ctx)
{
int c1, c2;
grub_disk_addr_t val;
char *run;
run = ctx->cur_run;
retry:
c1 = ((unsigned char) (*run) & 0xF);
c2 = ((unsigned char) (*run) >> 4);
if (!c1)
{
if ((ctx->attr) && (ctx->attr->flags & GRUB_NTFS_AF_ALST))
{
void NESTED_FUNC_ATTR (*save_hook) (grub_disk_addr_t sector,
unsigned offset,
unsigned length);
save_hook = ctx->comp.disk->read_hook;
ctx->comp.disk->read_hook = 0;
run = find_attr (ctx->attr, (unsigned char) *ctx->attr->attr_cur);
ctx->comp.disk->read_hook = save_hook;
if (run)
{
if (run[8] == 0)
return grub_error (GRUB_ERR_BAD_FS,
"$DATA should be non-resident");
run += u16at (run, 0x20);
ctx->curr_lcn = 0;
goto retry;
}
}
return grub_error (GRUB_ERR_BAD_FS, "run list overflown");
}
run = read_run_data (run + 1, c1, &val, 0); /* length of current VCN */
ctx->curr_vcn = ctx->next_vcn;
ctx->next_vcn += val;
run = read_run_data (run, c2, &val, 1); /* offset to previous LCN */
ctx->curr_lcn += val;
if (val == 0)
ctx->flags |= GRUB_NTFS_RF_BLNK;
else
ctx->flags &= ~GRUB_NTFS_RF_BLNK;
ctx->cur_run = run;
return 0;
}
static grub_disk_addr_t
grub_ntfs_read_block (grub_fshelp_node_t node, grub_disk_addr_t block)
{
struct grub_ntfs_rlst *ctx;
ctx = (struct grub_ntfs_rlst *) node;
if (block >= ctx->next_vcn)
{
if (grub_ntfs_read_run_list (ctx))
return -1;
return ctx->curr_lcn;
}
else
return (ctx->flags & GRUB_NTFS_RF_BLNK) ? 0 : (block -
ctx->curr_vcn + ctx->curr_lcn);
}
static grub_err_t
read_data (struct grub_ntfs_attr *at, char *pa, char *dest,
grub_disk_addr_t ofs, grub_size_t len, int cached,
void NESTED_FUNC_ATTR (*read_hook) (grub_disk_addr_t sector,
unsigned offset,
unsigned length))
{
grub_disk_addr_t vcn;
struct grub_ntfs_rlst cc, *ctx;
if (len == 0)
return 0;
grub_memset (&cc, 0, sizeof (cc));
ctx = &cc;
ctx->attr = at;
ctx->comp.log_spc = at->mft->data->log_spc;
ctx->comp.disk = at->mft->data->disk;
if (pa[8] == 0)
{
if (ofs + len > u32at (pa, 0x10))
return grub_error (GRUB_ERR_BAD_FS, "read out of range");
grub_memcpy (dest, pa + u32at (pa, 0x14) + ofs, len);
return 0;
}
if (u16at (pa, 0xC) & GRUB_NTFS_FLAG_COMPRESSED)
ctx->flags |= GRUB_NTFS_RF_COMP;
else
ctx->flags &= ~GRUB_NTFS_RF_COMP;
ctx->cur_run = pa + u16at (pa, 0x20);
if (ctx->flags & GRUB_NTFS_RF_COMP)
{
if (!cached)
return grub_error (GRUB_ERR_BAD_FS, "attribute can\'t be compressed");
if (at->sbuf)
{
if ((ofs & (~(GRUB_NTFS_COM_LEN - 1))) == at->save_pos)
{
grub_disk_addr_t n;
n = GRUB_NTFS_COM_LEN - (ofs - at->save_pos);
if (n > len)
n = len;
grub_memcpy (dest, at->sbuf + ofs - at->save_pos, n);
if (n == len)
return 0;
dest += n;
len -= n;
ofs += n;
}
}
else
{
at->sbuf = grub_malloc (GRUB_NTFS_COM_LEN);
if (at->sbuf == NULL)
return grub_errno;
at->save_pos = 1;
}
vcn = ctx->target_vcn = (ofs >> GRUB_NTFS_COM_LOG_LEN) * (GRUB_NTFS_COM_SEC >> ctx->comp.log_spc);
ctx->target_vcn &= ~0xFULL;
}
else
vcn = ctx->target_vcn = ofs >> (GRUB_NTFS_BLK_SHR + ctx->comp.log_spc);
ctx->next_vcn = u32at (pa, 0x10);
ctx->curr_lcn = 0;
while (ctx->next_vcn <= ctx->target_vcn)
{
if (grub_ntfs_read_run_list (ctx))
return grub_errno;
}
if (at->flags & GRUB_NTFS_AF_GPOS)
{
grub_disk_addr_t st0, st1;
grub_uint64_t m;
m = (ofs >> GRUB_NTFS_BLK_SHR) & ((1 << ctx->comp.log_spc) - 1);
st0 =
((ctx->target_vcn - ctx->curr_vcn + ctx->curr_lcn) << ctx->comp.log_spc) + m;
st1 = st0 + 1;
if (st1 ==
(ctx->next_vcn - ctx->curr_vcn + ctx->curr_lcn) << ctx->comp.log_spc)
{
if (grub_ntfs_read_run_list (ctx))
return grub_errno;
st1 = ctx->curr_lcn << ctx->comp.log_spc;
}
grub_set_unaligned32 (dest, grub_cpu_to_le32 (st0));
grub_set_unaligned32 (dest + 4, grub_cpu_to_le32 (st1));
return 0;
}
if (!(ctx->flags & GRUB_NTFS_RF_COMP))
{
grub_fshelp_read_file (ctx->comp.disk, (grub_fshelp_node_t) ctx,
read_hook, ofs, len, dest,
grub_ntfs_read_block, ofs + len,
ctx->comp.log_spc, 0);
return grub_errno;
}
return (grub_ntfscomp_func) ? grub_ntfscomp_func (at, dest, ofs, len, ctx,
vcn) :
grub_error (GRUB_ERR_BAD_FS, N_("module `%s' isn't loaded"),
"ntfscomp");
}
static grub_err_t
read_attr (struct grub_ntfs_attr *at, char *dest, grub_disk_addr_t ofs,
grub_size_t len, int cached,
void NESTED_FUNC_ATTR (*read_hook) (grub_disk_addr_t sector,
unsigned offset,
unsigned length))
{
char *save_cur;
unsigned char attr;
char *pp;
grub_err_t ret;
save_cur = at->attr_cur;
at->attr_nxt = at->attr_cur;
attr = (unsigned char) *at->attr_nxt;
if (at->flags & GRUB_NTFS_AF_ALST)
{
char *pa;
grub_disk_addr_t vcn;
/* If compression is possible make sure that we include possible
compressed block size. */
if (GRUB_NTFS_LOG_COM_SEC >= at->mft->data->log_spc)
vcn = ((ofs >> GRUB_NTFS_COM_LOG_LEN)
<< (GRUB_NTFS_LOG_COM_SEC - at->mft->data->log_spc)) & ~0xFULL;
else
vcn = ofs >> (at->mft->data->log_spc + GRUB_NTFS_BLK_SHR);
pa = at->attr_nxt + u16at (at->attr_nxt, 4);
while (pa < at->attr_end)
{
if ((unsigned char) *pa != attr)
break;
if (u32at (pa, 8) > vcn)
break;
at->attr_nxt = pa;
pa += u16at (pa, 4);
}
}
pp = find_attr (at, attr);
if (pp)
ret = read_data (at, pp, dest, ofs, len, cached, read_hook);
else
ret =
(grub_errno) ? grub_errno : grub_error (GRUB_ERR_BAD_FS,
"attribute not found");
at->attr_cur = save_cur;
return ret;
}
static grub_err_t
read_mft (struct grub_ntfs_data *data, char *buf, grub_uint32_t mftno)
{
if (read_attr
(&data->mmft.attr, buf, mftno * ((grub_disk_addr_t) data->mft_size << GRUB_NTFS_BLK_SHR),
data->mft_size << GRUB_NTFS_BLK_SHR, 0, 0))
return grub_error (GRUB_ERR_BAD_FS, "read MFT 0x%X fails", mftno);
return fixup (buf, data->mft_size, "FILE");
}
static grub_err_t
init_file (struct grub_ntfs_file *mft, grub_uint32_t mftno)
{
unsigned short flag;
mft->inode_read = 1;
mft->buf = grub_malloc (mft->data->mft_size << GRUB_NTFS_BLK_SHR);
if (mft->buf == NULL)
return grub_errno;
if (read_mft (mft->data, mft->buf, mftno))
return grub_errno;
flag = u16at (mft->buf, 0x16);
if ((flag & 1) == 0)
return grub_error (GRUB_ERR_BAD_FS, "MFT 0x%X is not in use", mftno);
if ((flag & 2) == 0)
{
char *pa;
pa = locate_attr (&mft->attr, mft, GRUB_NTFS_AT_DATA);
if (pa == NULL)
return grub_error (GRUB_ERR_BAD_FS, "no $DATA in MFT 0x%X", mftno);
if (!pa[8])
mft->size = u32at (pa, 0x10);
else
mft->size = u64at (pa, 0x30);
if ((mft->attr.flags & GRUB_NTFS_AF_ALST) == 0)
mft->attr.attr_end = 0; /* Don't jump to attribute list */
}
else
init_attr (&mft->attr, mft);
return 0;
}
static void
free_file (struct grub_ntfs_file *mft)
{
free_attr (&mft->attr);
grub_free (mft->buf);
}
static int
list_file (struct grub_ntfs_file *diro, char *pos,
int NESTED_FUNC_ATTR
(*hook) (const char *filename,
enum grub_fshelp_filetype filetype,
grub_fshelp_node_t node))
{
char *np;
int ns;
while (1)
{
char *ustr, namespace;
if (pos[0xC] & 2) /* end signature */
break;
np = pos + 0x50;
ns = (unsigned char) *(np++);
namespace = *(np++);
/*
* Ignore files in DOS namespace, as they will reappear as Win32
* names.
*/
if ((ns) && (namespace != 2))
{
enum grub_fshelp_filetype type;
struct grub_ntfs_file *fdiro;
grub_uint32_t attr;
if (u16at (pos, 4))
{
grub_error (GRUB_ERR_BAD_FS, "64-bit MFT number");
return 0;
}
attr = u32at (pos, 0x48);
if (attr & GRUB_NTFS_ATTR_REPARSE)
type = GRUB_FSHELP_SYMLINK;
else if (attr & GRUB_NTFS_ATTR_DIRECTORY)
type = GRUB_FSHELP_DIR;
else
type = GRUB_FSHELP_REG;
fdiro = grub_zalloc (sizeof (struct grub_ntfs_file));
if (!fdiro)
return 0;
fdiro->data = diro->data;
fdiro->ino = u32at (pos, 0);
fdiro->mtime = u64at (pos, 0x20);
ustr = grub_malloc (ns * GRUB_MAX_UTF8_PER_UTF16 + 1);
if (ustr == NULL)
return 0;
{
grub_uint16_t tmp[ns];
int i;
for (i = 0; i < ns; i++)
tmp[i] = grub_le_to_cpu16 (grub_get_unaligned16 ((char *) np
+ 2 * i));
*grub_utf16_to_utf8 ((grub_uint8_t *) ustr, tmp, ns) = '\0';
}
if (namespace)
type |= GRUB_FSHELP_CASE_INSENSITIVE;
if (hook (ustr, type, fdiro))
{
grub_free (ustr);
return 1;
}
grub_free (ustr);
}
pos += u16at (pos, 8);
}
return 0;
}
struct symlink_descriptor
{
grub_uint32_t type;
grub_uint32_t total_len;
grub_uint16_t off1;
grub_uint16_t len1;
grub_uint16_t off2;
grub_uint16_t len2;
} __attribute__ ((packed));
static char *
grub_ntfs_read_symlink (grub_fshelp_node_t node)
{
struct grub_ntfs_file *mft;
struct symlink_descriptor symdesc;
grub_err_t err;
grub_uint16_t *buf16;
char *buf, *end;
grub_size_t len;
grub_size_t i;
char *pa;
grub_size_t off;
mft = (struct grub_ntfs_file *) node;
mft->buf = grub_malloc (mft->data->mft_size << GRUB_NTFS_BLK_SHR);
if (mft->buf == NULL)
return NULL;
if (read_mft (mft->data, mft->buf, mft->ino))
return NULL;
pa = locate_attr (&mft->attr, mft, GRUB_NTFS_AT_SYMLINK);
if (pa == NULL)
{
grub_error (GRUB_ERR_BAD_FS, "no $SYMLINK in MFT 0x%X", mft->ino);
return NULL;
}
err = read_attr (&mft->attr, (char *) &symdesc, 0,
sizeof (struct symlink_descriptor), 1, 0);
if (err)
return NULL;
switch (grub_cpu_to_le32 (symdesc.type))
{
case 0xa000000c:
off = (sizeof (struct symlink_descriptor) + 4
+ grub_cpu_to_le32 (symdesc.off1));
len = grub_cpu_to_le32 (symdesc.len1);
break;
case 0xa0000003:
off = (sizeof (struct symlink_descriptor)
+ grub_cpu_to_le32 (symdesc.off1));
len = grub_cpu_to_le32 (symdesc.len1);
break;
default:
grub_error (GRUB_ERR_BAD_FS, "symlink type invalid (%x)",
grub_cpu_to_le32 (symdesc.type));
return NULL;
}
buf16 = grub_malloc (len);
if (!buf16)
return NULL;
err = read_attr (&mft->attr, (char *) buf16, off, len, 1, 0);
if (err)
return NULL;
buf = grub_malloc (len * 2 + 1);
if (!buf)
{
grub_free (buf16);
return NULL;
}
for (i = 0; i < len / 2; i++)
{
buf16[i] = grub_le_to_cpu16 (buf16[i]);
if (buf16[i] == '\\')
buf16[i] = '/';
}
end = (char *) grub_utf16_to_utf8 ((grub_uint8_t *) buf, buf16, len / 2);
*end = '\0';
/* Split the sequence to avoid GCC thinking that this is a trigraph. */
if (grub_memcmp (buf, "/?" "?/", 4) == 0 && buf[5] == ':' && buf[6] == '/'
&& grub_isalpha (buf[4]))
{
grub_memmove (buf, buf + 6, end - buf + 1 - 6);
end -= 6;
}
return buf;
}
static int
grub_ntfs_iterate_dir (grub_fshelp_node_t dir,
int NESTED_FUNC_ATTR
(*hook) (const char *filename,
enum grub_fshelp_filetype filetype,
grub_fshelp_node_t node))
{
unsigned char *bitmap;
struct grub_ntfs_attr attr, *at;
char *cur_pos, *indx, *bmp;
int ret = 0;
grub_size_t bitmap_len;
struct grub_ntfs_file *mft;
mft = (struct grub_ntfs_file *) dir;
if (!mft->inode_read)
{
if (init_file (mft, mft->ino))
return 0;
}
indx = NULL;
bmp = NULL;
at = &attr;
init_attr (at, mft);
while (1)
{
cur_pos = find_attr (at, GRUB_NTFS_AT_INDEX_ROOT);
if (cur_pos == NULL)
{
grub_error (GRUB_ERR_BAD_FS, "no $INDEX_ROOT");
goto done;
}
/* Resident, Namelen=4, Offset=0x18, Flags=0x00, Name="$I30" */
if ((u32at (cur_pos, 8) != 0x180400) ||
(u32at (cur_pos, 0x18) != 0x490024) ||
(u32at (cur_pos, 0x1C) != 0x300033))
continue;
cur_pos += u16at (cur_pos, 0x14);
if (*cur_pos != 0x30) /* Not filename index */
continue;
break;
}
cur_pos += 0x10; /* Skip index root */
ret = list_file (mft, cur_pos + u16at (cur_pos, 0), hook);
if (ret)
goto done;
bitmap = NULL;
bitmap_len = 0;
free_attr (at);
init_attr (at, mft);
while ((cur_pos = find_attr (at, GRUB_NTFS_AT_BITMAP)) != NULL)
{
int ofs;
ofs = (unsigned char) cur_pos[0xA];
/* Namelen=4, Name="$I30" */
if ((cur_pos[9] == 4) &&
(u32at (cur_pos, ofs) == 0x490024) &&
(u32at (cur_pos, ofs + 4) == 0x300033))
{
int is_resident = (cur_pos[8] == 0);
bitmap_len = ((is_resident) ? u32at (cur_pos, 0x10) :
u32at (cur_pos, 0x28));
bmp = grub_malloc (bitmap_len);
if (bmp == NULL)
goto done;
if (is_resident)
{
grub_memcpy (bmp, (char *) (cur_pos + u16at (cur_pos, 0x14)),
bitmap_len);
}
else
{
if (read_data (at, cur_pos, bmp, 0, bitmap_len, 0, 0))
{
grub_error (GRUB_ERR_BAD_FS,
"fails to read non-resident $BITMAP");
goto done;
}
bitmap_len = u32at (cur_pos, 0x30);
}
bitmap = (unsigned char *) bmp;
break;
}
}
free_attr (at);
cur_pos = locate_attr (at, mft, GRUB_NTFS_AT_INDEX_ALLOCATION);
while (cur_pos != NULL)
{
/* Non-resident, Namelen=4, Offset=0x40, Flags=0, Name="$I30" */
if ((u32at (cur_pos, 8) == 0x400401) &&
(u32at (cur_pos, 0x40) == 0x490024) &&
(u32at (cur_pos, 0x44) == 0x300033))
break;
cur_pos = find_attr (at, GRUB_NTFS_AT_INDEX_ALLOCATION);
}
if ((!cur_pos) && (bitmap))
{
grub_error (GRUB_ERR_BAD_FS, "$BITMAP without $INDEX_ALLOCATION");
goto done;
}
if (bitmap)
{
grub_disk_addr_t v, i;
indx = grub_malloc (mft->data->idx_size << GRUB_NTFS_BLK_SHR);
if (indx == NULL)
goto done;
v = 1;
for (i = 0; i < (grub_disk_addr_t)bitmap_len * 8; i++)
{
if (*bitmap & v)
{
if ((read_attr
(at, indx, i * (mft->data->idx_size << GRUB_NTFS_BLK_SHR),
(mft->data->idx_size << GRUB_NTFS_BLK_SHR), 0, 0))
|| (fixup (indx, mft->data->idx_size, "INDX")))
goto done;
ret = list_file (mft, &indx[0x18 + u16at (indx, 0x18)], hook);
if (ret)
goto done;
}
v <<= 1;
if (v >= 0x100)
{
v = 1;
bitmap++;
}
}
}
done:
free_attr (at);
grub_free (indx);
grub_free (bmp);
return ret;
}
static struct grub_ntfs_data *
grub_ntfs_mount (grub_disk_t disk)
{
struct grub_ntfs_bpb bpb;
struct grub_ntfs_data *data = 0;
grub_uint32_t spc;
if (!disk)
goto fail;
data = (struct grub_ntfs_data *) grub_zalloc (sizeof (*data));
if (!data)
goto fail;
data->disk = disk;
/* Read the BPB. */
if (grub_disk_read (disk, 0, 0, sizeof (bpb), &bpb))
goto fail;
if (grub_memcmp ((char *) &bpb.oem_name, "NTFS", 4) != 0
|| bpb.sectors_per_cluster == 0
|| (bpb.sectors_per_cluster & (bpb.sectors_per_cluster - 1)) != 0
|| bpb.bytes_per_sector == 0
|| (bpb.bytes_per_sector & (bpb.bytes_per_sector - 1)) != 0)
goto fail;
spc = (((grub_uint32_t) bpb.sectors_per_cluster
* (grub_uint32_t) grub_le_to_cpu16 (bpb.bytes_per_sector))
>> GRUB_NTFS_BLK_SHR);
if (spc == 0 || (spc & (spc - 1)))
goto fail;
for (data->log_spc = 0; (1U << data->log_spc) < spc; data->log_spc++);
if (bpb.clusters_per_mft > 0)
data->mft_size = bpb.clusters_per_mft << data->log_spc;
else
data->mft_size = 1 << (-bpb.clusters_per_mft - GRUB_NTFS_BLK_SHR);
if (bpb.clusters_per_index > 0)
data->idx_size = bpb.clusters_per_index << data->log_spc;
else
data->idx_size = 1 << (-bpb.clusters_per_index - GRUB_NTFS_BLK_SHR);
data->mft_start = grub_le_to_cpu64 (bpb.mft_lcn) << data->log_spc;
if ((data->mft_size > GRUB_NTFS_MAX_MFT) || (data->idx_size > GRUB_NTFS_MAX_IDX))
goto fail;
data->mmft.data = data;
data->cmft.data = data;
data->mmft.buf = grub_malloc (data->mft_size << GRUB_NTFS_BLK_SHR);
if (!data->mmft.buf)
goto fail;
if (grub_disk_read
(disk, data->mft_start, 0, data->mft_size << GRUB_NTFS_BLK_SHR, data->mmft.buf))
goto fail;
data->uuid = grub_le_to_cpu64 (bpb.num_serial);
if (fixup (data->mmft.buf, data->mft_size, "FILE"))
goto fail;
if (!locate_attr (&data->mmft.attr, &data->mmft, GRUB_NTFS_AT_DATA))
goto fail;
if (init_file (&data->cmft, GRUB_NTFS_FILE_ROOT))
goto fail;
return data;
fail:
grub_error (GRUB_ERR_BAD_FS, "not an ntfs filesystem");
if (data)
{
free_file (&data->mmft);
free_file (&data->cmft);
grub_free (data);
}
return 0;
}
static grub_err_t
grub_ntfs_dir (grub_device_t device, const char *path,
int (*hook) (const char *filename,
const struct grub_dirhook_info *info))
{
struct grub_ntfs_data *data = 0;
struct grub_fshelp_node *fdiro = 0;
auto int NESTED_FUNC_ATTR iterate (const char *filename,
enum grub_fshelp_filetype filetype,
grub_fshelp_node_t node);
int NESTED_FUNC_ATTR iterate (const char *filename,
enum grub_fshelp_filetype filetype,
grub_fshelp_node_t node)
{
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 = grub_divmod64 (node->mtime, 10000000, 0)
- 86400ULL * 365 * (1970 - 1601)
- 86400ULL * ((1970 - 1601) / 4) + 86400ULL * ((1970 - 1601) / 100);
grub_free (node);
return hook (filename, &info);
}
grub_dl_ref (my_mod);
data = grub_ntfs_mount (device->disk);
if (!data)
goto fail;
grub_fshelp_find_file (path, &data->cmft, &fdiro, grub_ntfs_iterate_dir,
grub_ntfs_read_symlink, GRUB_FSHELP_DIR);
if (grub_errno)
goto fail;
grub_ntfs_iterate_dir (fdiro, iterate);
fail:
if ((fdiro) && (fdiro != &data->cmft))
{
free_file (fdiro);
grub_free (fdiro);
}
if (data)
{
free_file (&data->mmft);
free_file (&data->cmft);
grub_free (data);
}
grub_dl_unref (my_mod);
return grub_errno;
}
static grub_err_t
grub_ntfs_open (grub_file_t file, const char *name)
{
struct grub_ntfs_data *data = 0;
struct grub_fshelp_node *mft = 0;
grub_dl_ref (my_mod);
data = grub_ntfs_mount (file->device->disk);
if (!data)
goto fail;
grub_fshelp_find_file (name, &data->cmft, &mft, grub_ntfs_iterate_dir,
grub_ntfs_read_symlink, GRUB_FSHELP_REG);
if (grub_errno)
goto fail;
if (mft != &data->cmft)
{
free_file (&data->cmft);
grub_memcpy (&data->cmft, mft, sizeof (*mft));
grub_free (mft);
if (!data->cmft.inode_read)
{
if (init_file (&data->cmft, data->cmft.ino))
goto fail;
}
}
file->size = data->cmft.size;
file->data = data;
file->offset = 0;
return 0;
fail:
if (data)
{
free_file (&data->mmft);
free_file (&data->cmft);
grub_free (data);
}
grub_dl_unref (my_mod);
return grub_errno;
}
static grub_ssize_t
grub_ntfs_read (grub_file_t file, char *buf, grub_size_t len)
{
struct grub_ntfs_file *mft;
mft = &((struct grub_ntfs_data *) file->data)->cmft;
if (file->read_hook)
mft->attr.save_pos = 1;
read_attr (&mft->attr, buf, file->offset, len, 1, file->read_hook);
return (grub_errno) ? -1 : (grub_ssize_t) len;
}
static grub_err_t
grub_ntfs_close (grub_file_t file)
{
struct grub_ntfs_data *data;
data = file->data;
if (data)
{
free_file (&data->mmft);
free_file (&data->cmft);
grub_free (data);
}
grub_dl_unref (my_mod);
return grub_errno;
}
static grub_err_t
grub_ntfs_label (grub_device_t device, char **label)
{
struct grub_ntfs_data *data = 0;
struct grub_fshelp_node *mft = 0;
char *pa;
grub_dl_ref (my_mod);
*label = 0;
data = grub_ntfs_mount (device->disk);
if (!data)
goto fail;
grub_fshelp_find_file ("/$Volume", &data->cmft, &mft, grub_ntfs_iterate_dir,
0, GRUB_FSHELP_REG);
if (grub_errno)
goto fail;
if (!mft->inode_read)
{
mft->buf = grub_malloc (mft->data->mft_size << GRUB_NTFS_BLK_SHR);
if (mft->buf == NULL)
goto fail;
if (read_mft (mft->data, mft->buf, mft->ino))
goto fail;
}
init_attr (&mft->attr, mft);
pa = find_attr (&mft->attr, GRUB_NTFS_AT_VOLUME_NAME);
if ((pa) && (pa[8] == 0) && (u32at (pa, 0x10)))
{
char *buf;
int len;
len = u32at (pa, 0x10) / 2;
buf = grub_malloc (len * 4 + 1);
pa += u16at (pa, 0x14);
{
grub_uint16_t tmp[len];
int i;
for (i = 0; i < len; i++)
tmp[i] = grub_le_to_cpu16 (grub_get_unaligned16 (pa + 2 * i));
*grub_utf16_to_utf8 ((grub_uint8_t *) buf, tmp, len) =
'\0';
}
*label = buf;
}
fail:
if ((mft) && (mft != &data->cmft))
{
free_file (mft);
grub_free (mft);
}
if (data)
{
free_file (&data->mmft);
free_file (&data->cmft);
grub_free (data);
}
grub_dl_unref (my_mod);
return grub_errno;
}
static grub_err_t
grub_ntfs_uuid (grub_device_t device, char **uuid)
{
struct grub_ntfs_data *data;
grub_disk_t disk = device->disk;
grub_dl_ref (my_mod);
data = grub_ntfs_mount (disk);
if (data)
{
char *ptr;
*uuid = grub_xasprintf ("%016llx", (unsigned long long) data->uuid);
if (*uuid)
for (ptr = *uuid; *ptr; ptr++)
*ptr = grub_toupper (*ptr);
free_file (&data->mmft);
free_file (&data->cmft);
grub_free (data);
}
else
*uuid = NULL;
grub_dl_unref (my_mod);
return grub_errno;
}
static struct grub_fs grub_ntfs_fs =
{
.name = "ntfs",
.dir = grub_ntfs_dir,
.open = grub_ntfs_open,
.read = grub_ntfs_read,
.close = grub_ntfs_close,
.label = grub_ntfs_label,
.uuid = grub_ntfs_uuid,
#ifdef GRUB_UTIL
.reserved_first_sector = 1,
.blocklist_install = 1,
#endif
.next = 0
};
GRUB_MOD_INIT (ntfs)
{
grub_fs_register (&grub_ntfs_fs);
my_mod = mod;
}
GRUB_MOD_FINI (ntfs)
{
grub_fs_unregister (&grub_ntfs_fs);
}
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