mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
375fa06125
* commit '1619274fb393f55a365cc10f88faa173c9a8e772': av_dict_set: fix potential memory leak with AV_DICT_DONT_OVERWRITE Merged-by: Michael Niedermayer <michaelni@gmx.at>
194 lines
5.1 KiB
C
194 lines
5.1 KiB
C
/*
|
|
* copyright (c) 2009 Michael Niedermayer
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <string.h>
|
|
|
|
#include "avstring.h"
|
|
#include "dict.h"
|
|
#include "internal.h"
|
|
#include "mem.h"
|
|
|
|
struct AVDictionary {
|
|
int count;
|
|
AVDictionaryEntry *elems;
|
|
};
|
|
|
|
int av_dict_count(const AVDictionary *m)
|
|
{
|
|
return m ? m->count : 0;
|
|
}
|
|
|
|
AVDictionaryEntry *av_dict_get(FF_CONST_AVUTIL53 AVDictionary *m, const char *key,
|
|
const AVDictionaryEntry *prev, int flags)
|
|
{
|
|
unsigned int i, j;
|
|
|
|
if (!m)
|
|
return NULL;
|
|
|
|
if (prev)
|
|
i = prev - m->elems + 1;
|
|
else
|
|
i = 0;
|
|
|
|
for (; i < m->count; i++) {
|
|
const char *s = m->elems[i].key;
|
|
if (flags & AV_DICT_MATCH_CASE)
|
|
for (j = 0; s[j] == key[j] && key[j]; j++)
|
|
;
|
|
else
|
|
for (j = 0; av_toupper(s[j]) == av_toupper(key[j]) && key[j]; j++)
|
|
;
|
|
if (key[j])
|
|
continue;
|
|
if (s[j] && !(flags & AV_DICT_IGNORE_SUFFIX))
|
|
continue;
|
|
return &m->elems[i];
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int av_dict_set(AVDictionary **pm, const char *key, const char *value,
|
|
int flags)
|
|
{
|
|
AVDictionary *m = *pm;
|
|
AVDictionaryEntry *tag = av_dict_get(m, key, NULL, flags);
|
|
char *oldval = NULL;
|
|
|
|
if (!m)
|
|
m = *pm = av_mallocz(sizeof(*m));
|
|
|
|
if (tag) {
|
|
if (flags & AV_DICT_DONT_OVERWRITE) {
|
|
if (flags & AV_DICT_DONT_STRDUP_KEY) av_free(key);
|
|
if (flags & AV_DICT_DONT_STRDUP_VAL) av_free(value);
|
|
return 0;
|
|
}
|
|
if (flags & AV_DICT_APPEND)
|
|
oldval = tag->value;
|
|
else
|
|
av_free(tag->value);
|
|
av_free(tag->key);
|
|
*tag = m->elems[--m->count];
|
|
} else {
|
|
AVDictionaryEntry *tmp = av_realloc(m->elems,
|
|
(m->count + 1) * sizeof(*m->elems));
|
|
if (tmp)
|
|
m->elems = tmp;
|
|
else
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
if (value) {
|
|
if (flags & AV_DICT_DONT_STRDUP_KEY)
|
|
m->elems[m->count].key = (char*)(intptr_t)key;
|
|
else
|
|
m->elems[m->count].key = av_strdup(key);
|
|
if (flags & AV_DICT_DONT_STRDUP_VAL) {
|
|
m->elems[m->count].value = (char*)(intptr_t)value;
|
|
} else if (oldval && flags & AV_DICT_APPEND) {
|
|
int len = strlen(oldval) + strlen(value) + 1;
|
|
char *newval = av_mallocz(len);
|
|
if (!newval)
|
|
return AVERROR(ENOMEM);
|
|
av_strlcat(newval, oldval, len);
|
|
av_freep(&oldval);
|
|
av_strlcat(newval, value, len);
|
|
m->elems[m->count].value = newval;
|
|
} else
|
|
m->elems[m->count].value = av_strdup(value);
|
|
m->count++;
|
|
}
|
|
if (!m->count) {
|
|
av_free(m->elems);
|
|
av_freep(pm);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parse_key_value_pair(AVDictionary **pm, const char **buf,
|
|
const char *key_val_sep, const char *pairs_sep,
|
|
int flags)
|
|
{
|
|
char *key = av_get_token(buf, key_val_sep);
|
|
char *val = NULL;
|
|
int ret;
|
|
|
|
if (key && *key && strspn(*buf, key_val_sep)) {
|
|
(*buf)++;
|
|
val = av_get_token(buf, pairs_sep);
|
|
}
|
|
|
|
if (key && *key && val && *val)
|
|
ret = av_dict_set(pm, key, val, flags);
|
|
else
|
|
ret = AVERROR(EINVAL);
|
|
|
|
av_freep(&key);
|
|
av_freep(&val);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int av_dict_parse_string(AVDictionary **pm, const char *str,
|
|
const char *key_val_sep, const char *pairs_sep,
|
|
int flags)
|
|
{
|
|
int ret;
|
|
|
|
if (!str)
|
|
return 0;
|
|
|
|
/* ignore STRDUP flags */
|
|
flags &= ~(AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL);
|
|
|
|
while (*str) {
|
|
if ((ret = parse_key_value_pair(pm, &str, key_val_sep, pairs_sep, flags)) < 0)
|
|
return ret;
|
|
|
|
if (*str)
|
|
str++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void av_dict_free(AVDictionary **pm)
|
|
{
|
|
AVDictionary *m = *pm;
|
|
|
|
if (m) {
|
|
while (m->count--) {
|
|
av_free(m->elems[m->count].key);
|
|
av_free(m->elems[m->count].value);
|
|
}
|
|
av_free(m->elems);
|
|
}
|
|
av_freep(pm);
|
|
}
|
|
|
|
void av_dict_copy(AVDictionary **dst, FF_CONST_AVUTIL53 AVDictionary *src, int flags)
|
|
{
|
|
AVDictionaryEntry *t = NULL;
|
|
|
|
while ((t = av_dict_get(src, "", t, AV_DICT_IGNORE_SUFFIX)))
|
|
av_dict_set(dst, t->key, t->value, flags);
|
|
}
|