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[TEXTSEARCH]: Fix Boyer Moore initialization bug

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The pattern is set after trying to compute the prefix table, which tries
to use it. Initialize it before calling compute_prefix_tbl, make
compute_prefix_tbl consistently use only the data from struct ts_bm
and remove the now unnecessary arguments.

Signed-off-by: Michael Rash <mbr@cipherdyne.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Rash 2006-08-22 00:45:22 -07:00 committed by David S. Miller
parent 316c1592be
commit 3ffaa8c7c0
1 changed files with 5 additions and 6 deletions
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11
lib/ts_bm.c
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@ -111,15 +111,14 @@ static int subpattern(u8 *pattern, int i, int j, int g)
return ret;
}
static void compute_prefix_tbl(struct ts_bm *bm, const u8 *pattern,
unsigned int len)
static void compute_prefix_tbl(struct ts_bm *bm)
{
int i, j, g;
for (i = 0; i < ASIZE; i++)
bm->bad_shift[i] = len;
for (i = 0; i < len - 1; i++)
bm->bad_shift[pattern[i]] = len - 1 - i;
bm->bad_shift[i] = bm->patlen;
for (i = 0; i < bm->patlen - 1; i++)
bm->bad_shift[bm->pattern[i]] = bm->patlen - 1 - i;
/* Compute the good shift array, used to match reocurrences
* of a subpattern */
@ -150,8 +149,8 @@ static struct ts_config *bm_init(const void *pattern, unsigned int len,
bm = ts_config_priv(conf);
bm->patlen = len;
bm->pattern = (u8 *) bm->good_shift + prefix_tbl_len;
compute_prefix_tbl(bm, pattern, len);
memcpy(bm->pattern, pattern, len);
compute_prefix_tbl(bm);
return conf;
}