static av_cold int concat_open(URLContext *h, const char *uri, int flags) { char *node_uri = NULL; int err = 0; int64_t size; size_t len, i; URLContext *uc; struct concat_data *data = h->priv_data; struct concat_nodes *nodes; av_strstart(uri, "concat:", &uri); for (i = 0, len = 1; uri[i]; i++) if (uri[i] == *AV_CAT_SEPARATOR) /* integer overflow */ if (++len == UINT_MAX / sizeof(*nodes)) { av_freep(&h->priv_data); return AVERROR(ENAMETOOLONG); } if (!(nodes = av_malloc(sizeof(*nodes) * len))) { return AVERROR(ENOMEM); } else data->nodes = nodes; /* handle input */ if (!*uri) err = AVERROR(ENOENT); for (i = 0; *uri; i++) { /* parsing uri */ len = strcspn(uri, AV_CAT_SEPARATOR); if ((err = av_reallocp(&node_uri, len + 1)) < 0) break; av_strlcpy(node_uri, uri, len+1); uri += len + strspn(uri+len, AV_CAT_SEPARATOR); /* creating URLContext */ if ((err = ffurl_open(&uc, node_uri, flags, &h->interrupt_callback, NULL)) < 0) break; /* creating size */ if ((size = ffurl_size(uc)) < 0) { ffurl_close(uc); err = AVERROR(ENOSYS); break; } /* assembling */ nodes[i].uc = uc; nodes[i].size = size; } av_free(node_uri); data->length = i; if (err < 0) concat_close(h); else if ((err = av_reallocp(&nodes, data->length * sizeof(*nodes))) < 0) concat_close(h); else data->nodes = nodes; return err; }