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, *copy_key = NULL, *copy_value = NULL; 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 { 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); }