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FFmpeg/libavutil/dict.c

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/*
* 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"
#include "bprint.h"
struct AVDictionary {
int count;
AVDictionaryEntry *elems;
};
int av_dict_count(const AVDictionary *m)
{
return m ? m->count : 0;
}
AVDictionaryEntry *av_dict_get(const 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 = NULL;
char *oldval = NULL, *copy_key = NULL, *copy_value = NULL;
if (!(flags & AV_DICT_MULTIKEY)) {
tag = av_dict_get(m, key, NULL, flags);
}
if (flags & AV_DICT_DONT_STRDUP_KEY)
copy_key = (void *)key;
else
copy_key = av_strdup(key);
if (flags & AV_DICT_DONT_STRDUP_VAL)
copy_value = (void *)value;
else if (copy_key)
copy_value = av_strdup(value);
if (!m)
m = *pm = av_mallocz(sizeof(*m));
if (!m || (key && !copy_key) || (value && !copy_value))
goto err_out;
if (tag) {
if (flags & AV_DICT_DONT_OVERWRITE) {
av_free(copy_key);
av_free(copy_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 if (copy_value) {
AVDictionaryEntry *tmp = av_realloc(m->elems,
(m->count + 1) * sizeof(*m->elems));
if (!tmp)
goto err_out;
m->elems = tmp;
}
if (copy_value) {
m->elems[m->count].key = copy_key;
m->elems[m->count].value = copy_value;
if (oldval && flags & AV_DICT_APPEND) {
size_t len = strlen(oldval) + strlen(copy_value) + 1;
char *newval = av_mallocz(len);
if (!newval)
goto err_out;
av_strlcat(newval, oldval, len);
av_freep(&oldval);
av_strlcat(newval, copy_value, len);
m->elems[m->count].value = newval;
av_freep(&copy_value);
}
m->count++;
} else {
av_freep(&copy_key);
}
if (!m->count) {
av_freep(&m->elems);
av_freep(pm);
}
return 0;
err_out:
if (m && !m->count) {
av_freep(&m->elems);
av_freep(pm);
}
av_free(copy_key);
av_free(copy_value);
return AVERROR(ENOMEM);
}
int av_dict_set_int(AVDictionary **pm, const char *key, int64_t value,
int flags)
{
char valuestr[22];
snprintf(valuestr, sizeof(valuestr), "%"PRId64, value);
flags &= ~AV_DICT_DONT_STRDUP_VAL;
return av_dict_set(pm, key, valuestr, flags);
}
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_freep(&m->elems[m->count].key);
av_freep(&m->elems[m->count].value);
}
av_freep(&m->elems);
}
av_freep(pm);
}
int av_dict_copy(AVDictionary **dst, const AVDictionary *src, int flags)
{
AVDictionaryEntry *t = NULL;
while ((t = av_dict_get(src, "", t, AV_DICT_IGNORE_SUFFIX))) {
int ret = av_dict_set(dst, t->key, t->value, flags);
if (ret < 0)
return ret;
}
return 0;
}
int av_dict_get_string(const AVDictionary *m, char **buffer,
const char key_val_sep, const char pairs_sep)
{
AVDictionaryEntry *t = NULL;
AVBPrint bprint;
int cnt = 0;
char special_chars[] = {pairs_sep, key_val_sep, '\0'};
if (!buffer || pairs_sep == '\0' || key_val_sep == '\0' || pairs_sep == key_val_sep ||
pairs_sep == '\\' || key_val_sep == '\\')
return AVERROR(EINVAL);
if (!av_dict_count(m)) {
*buffer = av_strdup("");
return *buffer ? 0 : AVERROR(ENOMEM);
}
av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) {
if (cnt++)
av_bprint_append_data(&bprint, &pairs_sep, 1);
av_bprint_escape(&bprint, t->key, special_chars, AV_ESCAPE_MODE_BACKSLASH, 0);
av_bprint_append_data(&bprint, &key_val_sep, 1);
av_bprint_escape(&bprint, t->value, special_chars, AV_ESCAPE_MODE_BACKSLASH, 0);
}
return av_bprint_finalize(&bprint, buffer);
}
#ifdef TEST
static void print_dict(const AVDictionary *m)
{
AVDictionaryEntry *t = NULL;
while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
printf("%s %s ", t->key, t->value);
printf("\n");
}
static void test_separators(const AVDictionary *m, const char pair, const char val)
{
AVDictionary *dict = NULL;
char pairs[] = {pair , '\0'};
char vals[] = {val, '\0'};
char *buffer = NULL;
av_dict_copy(&dict, m, 0);
print_dict(dict);
av_dict_get_string(dict, &buffer, val, pair);
printf("%s\n", buffer);
av_dict_free(&dict);
av_dict_parse_string(&dict, buffer, vals, pairs, 0);
av_freep(&buffer);
print_dict(dict);
av_dict_free(&dict);
}
int main(void)
{
AVDictionary *dict = NULL;
AVDictionaryEntry *e;
char *buffer = NULL;
printf("Testing av_dict_get_string() and av_dict_parse_string()\n");
av_dict_get_string(dict, &buffer, '=', ',');
printf("%s\n", buffer);
av_freep(&buffer);
av_dict_set(&dict, "aaa", "aaa", 0);
av_dict_set(&dict, "b,b", "bbb", 0);
av_dict_set(&dict, "c=c", "ccc", 0);
av_dict_set(&dict, "ddd", "d,d", 0);
av_dict_set(&dict, "eee", "e=e", 0);
av_dict_set(&dict, "f,f", "f=f", 0);
av_dict_set(&dict, "g=g", "g,g", 0);
test_separators(dict, ',', '=');
av_dict_free(&dict);
av_dict_set(&dict, "aaa", "aaa", 0);
av_dict_set(&dict, "bbb", "bbb", 0);
av_dict_set(&dict, "ccc", "ccc", 0);
av_dict_set(&dict, "\\,=\'\"", "\\,=\'\"", 0);
test_separators(dict, '"', '=');
test_separators(dict, '\'', '=');
test_separators(dict, ',', '"');
test_separators(dict, ',', '\'');
test_separators(dict, '\'', '"');
test_separators(dict, '"', '\'');
av_dict_free(&dict);
printf("\nTesting av_dict_set()\n");
av_dict_set(&dict, "a", "a", 0);
av_dict_set(&dict, "b", av_strdup("b"), AV_DICT_DONT_STRDUP_VAL);
av_dict_set(&dict, av_strdup("c"), "c", AV_DICT_DONT_STRDUP_KEY);
av_dict_set(&dict, av_strdup("d"), av_strdup("d"), AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL);
av_dict_set(&dict, "e", "e", AV_DICT_DONT_OVERWRITE);
av_dict_set(&dict, "e", "f", AV_DICT_DONT_OVERWRITE);
av_dict_set(&dict, "f", "f", 0);
av_dict_set(&dict, "f", NULL, 0);
av_dict_set(&dict, "ff", "f", 0);
av_dict_set(&dict, "ff", "f", AV_DICT_APPEND);
e = NULL;
while ((e = av_dict_get(dict, "", e, AV_DICT_IGNORE_SUFFIX)))
printf("%s %s\n", e->key, e->value);
av_dict_free(&dict);
av_dict_set(&dict, NULL, "a", 0);
av_dict_set(&dict, NULL, "b", 0);
av_dict_get(dict, NULL, NULL, 0);
e = NULL;
while ((e = av_dict_get(dict, "", e, AV_DICT_IGNORE_SUFFIX)))
printf("'%s' '%s'\n", e->key, e->value);
av_dict_free(&dict);
//valgrind sensible test
printf("\nTesting av_dict_set_int()\n");
av_dict_set_int(&dict, "1", 1, AV_DICT_DONT_STRDUP_VAL);
av_dict_set_int(&dict, av_strdup("2"), 2, AV_DICT_DONT_STRDUP_KEY);
av_dict_set_int(&dict, av_strdup("3"), 3, AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL);
av_dict_set_int(&dict, "4", 4, 0);
av_dict_set_int(&dict, "5", 5, AV_DICT_DONT_OVERWRITE);
av_dict_set_int(&dict, "5", 6, AV_DICT_DONT_OVERWRITE);
av_dict_set_int(&dict, "12", 1, 0);
av_dict_set_int(&dict, "12", 2, AV_DICT_APPEND);
e = NULL;
while ((e = av_dict_get(dict, "", e, AV_DICT_IGNORE_SUFFIX)))
printf("%s %s\n", e->key, e->value);
av_dict_free(&dict);
//valgrind sensible test
printf("\nTesting av_dict_set() with existing AVDictionaryEntry.key as key\n");
av_dict_set(&dict, "key", "old", 0);
e = av_dict_get(dict, "key", NULL, 0);
av_dict_set(&dict, e->key, "new val OK", 0);
e = av_dict_get(dict, "key", NULL, 0);
printf("%s\n", e->value);
av_dict_set(&dict, e->key, e->value, 0);
e = av_dict_get(dict, "key", NULL, 0);
printf("%s\n", e->value);
av_dict_free(&dict);
return 0;
}
#endif
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