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* grub-core/fs/ntfs.c (read_run_data): Rewrite using bitfields.

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Saves 40 bytes on compressed image.
This commit is contained in:
Vladimir 'phcoder' Serbinenko 2013-10-21 04:05:23 +02:00
parent 47601ffe73
commit 1437da5440
2 changed files with 20 additions and 20 deletions
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6
ChangeLog
View file

@ -1,3 +1,9 @@
2013-10-21 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/fs/ntfs.c (read_run_data): Rewrite using bitfields.
Saves 40 bytes on compressed image.
2013-10-21 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/fs/ntfs.c (grub_ntfs_iterate_dir): Use grub_uint8_t for

34
grub-core/fs/ntfs.c
View file

@ -283,25 +283,17 @@ locate_attr (struct grub_ntfs_attr *at, struct grub_ntfs_file *mft,
return pa;
}
static grub_uint8_t *
read_run_data (grub_uint8_t *run, int nn, grub_disk_addr_t * val, int sig)
static grub_disk_addr_t
read_run_data (const grub_uint8_t *run, int nn, int sig)
{
grub_disk_addr_t r, v;
grub_uint64_t r = 0;
r = 0;
v = 1;
if (sig && nn && (run[nn - 1] & 0x80))
r = -1;
while (nn--)
{
r += v * (*(run++));
v <<= 8;
}
grub_memcpy (&r, run, nn);
if ((sig) && (r & (v >> 1)))
r -= v;
*val = r;
return run;
return grub_le_to_cpu64 (r);
}
grub_err_t
@ -313,8 +305,9 @@ grub_ntfs_read_run_list (struct grub_ntfs_rlst * ctx)
run = ctx->cur_run;
retry:
c1 = ((*run) & 0xF);
c2 = ((*run) >> 4);
c1 = ((*run) & 0x7);
c2 = ((*run) >> 4) & 0x7;
run++;
if (!c1)
{
if ((ctx->attr) && (ctx->attr->flags & GRUB_NTFS_AF_ALST))
@ -338,10 +331,11 @@ 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->next_vcn += read_run_data (run, c1, 0); /* length of current VCN */
run += c1;
val = read_run_data (run, c2, 1); /* offset to previous LCN */
run += c2;
ctx->curr_lcn += val;
if (val == 0)
ctx->flags |= GRUB_NTFS_RF_BLNK;