mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-03 16:09:39 +00:00
334 lines
9.3 KiB
C
334 lines
9.3 KiB
C
/* GPattern copy that supports raw (non-utf8) matching
|
|
* based on: GLIB - Library of useful routines for C programming
|
|
* Copyright (C) 1995-1997, 1999 Peter Mattis, Red Hat, Inc.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include "patternspec.h"
|
|
#include <string.h>
|
|
|
|
typedef enum
|
|
{
|
|
MATCH_ALL, /* "*A?A*" */
|
|
MATCH_ALL_TAIL, /* "*A?AA" */
|
|
MATCH_HEAD, /* "AAAA*" */
|
|
MATCH_TAIL, /* "*AAAA" */
|
|
MATCH_EXACT, /* "AAAAA" */
|
|
MATCH_LAST
|
|
} MatchType;
|
|
|
|
struct _PatternSpec
|
|
{
|
|
MatchMode match_mode;
|
|
MatchType match_type;
|
|
guint pattern_length;
|
|
guint min_length;
|
|
guint max_length;
|
|
gchar *pattern;
|
|
};
|
|
|
|
static inline gchar *
|
|
raw_strreverse (const gchar * str, gssize size)
|
|
{
|
|
g_assert (size > 0);
|
|
return g_strreverse (g_strndup (str, size));
|
|
}
|
|
|
|
static inline gboolean
|
|
pattern_ph_match (const gchar * match_pattern, MatchMode match_mode,
|
|
const gchar * match_string, gboolean * wildcard_reached_p)
|
|
{
|
|
register const gchar *pattern, *string;
|
|
register gchar ch;
|
|
|
|
pattern = match_pattern;
|
|
string = match_string;
|
|
|
|
ch = *pattern;
|
|
pattern++;
|
|
while (ch) {
|
|
switch (ch) {
|
|
case '?':
|
|
if (!*string)
|
|
return FALSE;
|
|
if (match_mode == MATCH_MODE_UTF8)
|
|
string = g_utf8_next_char (string);
|
|
else
|
|
++string;
|
|
break;
|
|
|
|
case '*':
|
|
*wildcard_reached_p = TRUE;
|
|
do {
|
|
ch = *pattern;
|
|
pattern++;
|
|
if (ch == '?') {
|
|
if (!*string)
|
|
return FALSE;
|
|
if (match_mode == MATCH_MODE_UTF8)
|
|
string = g_utf8_next_char (string);
|
|
else
|
|
++string;
|
|
}
|
|
}
|
|
while (ch == '*' || ch == '?');
|
|
if (!ch)
|
|
return TRUE;
|
|
do {
|
|
gboolean next_wildcard_reached = FALSE;
|
|
while (ch != *string) {
|
|
if (!*string)
|
|
return FALSE;
|
|
if (match_mode == MATCH_MODE_UTF8)
|
|
string = g_utf8_next_char (string);
|
|
else
|
|
++string;
|
|
}
|
|
string++;
|
|
if (pattern_ph_match (pattern, match_mode, string,
|
|
&next_wildcard_reached))
|
|
return TRUE;
|
|
if (next_wildcard_reached)
|
|
/* the forthcoming pattern substring up to the next wildcard has
|
|
* been matched, but a mismatch occurred for the rest of the
|
|
* pattern, following the next wildcard.
|
|
* there's no need to advance the current match position any
|
|
* further if the rest pattern will not match.
|
|
*/
|
|
return FALSE;
|
|
}
|
|
while (*string);
|
|
break;
|
|
|
|
default:
|
|
if (ch == *string)
|
|
string++;
|
|
else
|
|
return FALSE;
|
|
break;
|
|
}
|
|
|
|
ch = *pattern;
|
|
pattern++;
|
|
}
|
|
|
|
return *string == 0;
|
|
}
|
|
|
|
static gboolean
|
|
pattern_match (PatternSpec * pspec, guint string_length,
|
|
const gchar * string, const gchar * string_reversed)
|
|
{
|
|
MatchMode match_mode;
|
|
|
|
g_assert (pspec != NULL);
|
|
g_assert (string != NULL);
|
|
|
|
if (string_length < pspec->min_length || string_length > pspec->max_length)
|
|
return FALSE;
|
|
|
|
match_mode = pspec->match_mode;
|
|
if (match_mode == MATCH_MODE_AUTO) {
|
|
if (!g_utf8_validate (string, string_length, NULL))
|
|
match_mode = MATCH_MODE_RAW;
|
|
else
|
|
match_mode = MATCH_MODE_UTF8;
|
|
}
|
|
|
|
switch (pspec->match_type) {
|
|
gboolean dummy;
|
|
case MATCH_ALL:
|
|
return pattern_ph_match (pspec->pattern, match_mode, string, &dummy);
|
|
case MATCH_ALL_TAIL:
|
|
if (string_reversed)
|
|
return pattern_ph_match (pspec->pattern, match_mode, string_reversed,
|
|
&dummy);
|
|
else {
|
|
gboolean result;
|
|
gchar *tmp;
|
|
if (match_mode == MATCH_MODE_UTF8) {
|
|
tmp = g_utf8_strreverse (string, string_length);
|
|
} else {
|
|
tmp = raw_strreverse (string, string_length);
|
|
}
|
|
result = pattern_ph_match (pspec->pattern, match_mode, tmp, &dummy);
|
|
g_free (tmp);
|
|
return result;
|
|
}
|
|
case MATCH_HEAD:
|
|
if (pspec->pattern_length == string_length)
|
|
return memcmp (pspec->pattern, string, string_length) == 0;
|
|
else if (pspec->pattern_length)
|
|
return memcmp (pspec->pattern, string, pspec->pattern_length) == 0;
|
|
else
|
|
return TRUE;
|
|
case MATCH_TAIL:
|
|
if (pspec->pattern_length)
|
|
/* compare incl. NUL terminator */
|
|
return memcmp (pspec->pattern,
|
|
string + (string_length - pspec->pattern_length),
|
|
pspec->pattern_length + 1) == 0;
|
|
else
|
|
return TRUE;
|
|
case MATCH_EXACT:
|
|
if (pspec->pattern_length != string_length)
|
|
return FALSE;
|
|
else
|
|
return memcmp (pspec->pattern, string, string_length) == 0;
|
|
default:
|
|
g_return_val_if_fail (pspec->match_type < MATCH_LAST, FALSE);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
PatternSpec *
|
|
pattern_spec_new (const gchar * pattern, MatchMode match_mode)
|
|
{
|
|
PatternSpec *pspec;
|
|
gboolean seen_joker = FALSE, seen_wildcard = FALSE, more_wildcards = FALSE;
|
|
gint hw_pos = -1, tw_pos = -1, hj_pos = -1, tj_pos = -1;
|
|
gboolean follows_wildcard = FALSE;
|
|
guint pending_jokers = 0;
|
|
const gchar *s;
|
|
gchar *d;
|
|
guint i;
|
|
|
|
g_assert (pattern != NULL);
|
|
g_assert (match_mode != MATCH_MODE_UTF8
|
|
|| g_utf8_validate (pattern, -1, NULL));
|
|
|
|
/* canonicalize pattern and collect necessary stats */
|
|
pspec = g_new (PatternSpec, 1);
|
|
pspec->match_mode = match_mode;
|
|
pspec->pattern_length = strlen (pattern);
|
|
pspec->min_length = 0;
|
|
pspec->max_length = 0;
|
|
pspec->pattern = g_new (gchar, pspec->pattern_length + 1);
|
|
|
|
if (pspec->match_mode == MATCH_MODE_AUTO) {
|
|
if (!g_utf8_validate (pattern, -1, NULL))
|
|
pspec->match_mode = MATCH_MODE_RAW;
|
|
}
|
|
|
|
d = pspec->pattern;
|
|
for (i = 0, s = pattern; *s != 0; s++) {
|
|
switch (*s) {
|
|
case '*':
|
|
if (follows_wildcard) { /* compress multiple wildcards */
|
|
pspec->pattern_length--;
|
|
continue;
|
|
}
|
|
follows_wildcard = TRUE;
|
|
if (hw_pos < 0)
|
|
hw_pos = i;
|
|
tw_pos = i;
|
|
break;
|
|
case '?':
|
|
pending_jokers++;
|
|
pspec->min_length++;
|
|
if (pspec->match_mode == MATCH_MODE_RAW) {
|
|
pspec->max_length += 1;
|
|
} else {
|
|
pspec->max_length += 4; /* maximum UTF-8 character length */
|
|
}
|
|
continue;
|
|
default:
|
|
for (; pending_jokers; pending_jokers--, i++) {
|
|
*d++ = '?';
|
|
if (hj_pos < 0)
|
|
hj_pos = i;
|
|
tj_pos = i;
|
|
}
|
|
follows_wildcard = FALSE;
|
|
pspec->min_length++;
|
|
pspec->max_length++;
|
|
break;
|
|
}
|
|
*d++ = *s;
|
|
i++;
|
|
}
|
|
for (; pending_jokers; pending_jokers--) {
|
|
*d++ = '?';
|
|
if (hj_pos < 0)
|
|
hj_pos = i;
|
|
tj_pos = i;
|
|
}
|
|
*d++ = 0;
|
|
seen_joker = hj_pos >= 0;
|
|
seen_wildcard = hw_pos >= 0;
|
|
more_wildcards = seen_wildcard && hw_pos != tw_pos;
|
|
if (seen_wildcard)
|
|
pspec->max_length = G_MAXUINT;
|
|
|
|
/* special case sole head/tail wildcard or exact matches */
|
|
if (!seen_joker && !more_wildcards) {
|
|
if (pspec->pattern[0] == '*') {
|
|
pspec->match_type = MATCH_TAIL;
|
|
memmove (pspec->pattern, pspec->pattern + 1, --pspec->pattern_length);
|
|
pspec->pattern[pspec->pattern_length] = 0;
|
|
return pspec;
|
|
}
|
|
if (pspec->pattern_length > 0 &&
|
|
pspec->pattern[pspec->pattern_length - 1] == '*') {
|
|
pspec->match_type = MATCH_HEAD;
|
|
pspec->pattern[--pspec->pattern_length] = 0;
|
|
return pspec;
|
|
}
|
|
if (!seen_wildcard) {
|
|
pspec->match_type = MATCH_EXACT;
|
|
return pspec;
|
|
}
|
|
}
|
|
|
|
/* now just need to distinguish between head or tail match start */
|
|
tw_pos = pspec->pattern_length - 1 - tw_pos; /* last pos to tail distance */
|
|
tj_pos = pspec->pattern_length - 1 - tj_pos; /* last pos to tail distance */
|
|
if (seen_wildcard)
|
|
pspec->match_type = tw_pos > hw_pos ? MATCH_ALL_TAIL : MATCH_ALL;
|
|
else /* seen_joker */
|
|
pspec->match_type = tj_pos > hj_pos ? MATCH_ALL_TAIL : MATCH_ALL;
|
|
if (pspec->match_type == MATCH_ALL_TAIL) {
|
|
gchar *tmp = pspec->pattern;
|
|
|
|
if (pspec->match_mode == MATCH_MODE_RAW) {
|
|
pspec->pattern = raw_strreverse (pspec->pattern, pspec->pattern_length);
|
|
} else {
|
|
pspec->pattern =
|
|
g_utf8_strreverse (pspec->pattern, pspec->pattern_length);
|
|
}
|
|
g_free (tmp);
|
|
}
|
|
return pspec;
|
|
}
|
|
|
|
void
|
|
pattern_spec_free (PatternSpec * pspec)
|
|
{
|
|
g_assert (pspec != NULL);
|
|
|
|
g_free (pspec->pattern);
|
|
g_free (pspec);
|
|
}
|
|
|
|
gboolean
|
|
pattern_match_string (PatternSpec * pspec, const gchar * string)
|
|
{
|
|
return pattern_match (pspec, strlen (string), string, NULL);
|
|
}
|