Function mc_compact

modules/compression/compression.c:627–676

* Compaction function * 1) Headers of same type will be put together * 2) Header names with compact forms will be transformed to * compact form * 3) Headers which not in whitelist will be removed * 4) Unnecessary sdp body codec attributes lower than 96 removed */

 * 4) Unnecessary sdp body codec attributes lower than 96 removed
 */
static int mc_compact(struct sip_msg* msg, mc_whitelist_p wh_list, void* flags_p)
{
	struct mc_compact_args *mc_compact_args_p;

	/* first check if anyone else has called mc_compact() on this msg */
	if (GET_GLOBAL_CTX(compact_ctx_pos))
		return -1;

	mc_compact_args_p = pkg_malloc(sizeof(struct mc_compact_args));
	if (mc_compact_args_p==NULL) {
		LM_ERR("no more pkg mem\n");
		goto error;
	}

	mc_compact_args_p->wh_list = mc_dup_whitelist(wh_list);
	if (mc_compact_args_p->wh_list==NULL) {
		LM_ERR("no more pkg mem\n");
		goto error;
	}

	mc_compact_args_p->flags = (unsigned int)(unsigned long)flags_p;
	SET_GLOBAL_CTX(compact_ctx_pos, (void*)mc_compact_args_p);

	/* register stateless callbacks */
	if (register_post_raw_processing_cb(wrap_msg_compact, POST_RAW_PROCESSING, 1/*to be freed*/) < 0) {
		LM_ERR("failed to add raw processing cb\n");
		goto error;
	}

	if (tm_api.t_gett && msg->msg_flags&FL_TM_CB_REGISTERED)
		goto error;

	/*register tm callback if tm api */
	if (tm_api.register_tmcb &&
			tm_api.register_tmcb( msg, 0, TMCB_PRE_SEND_BUFFER,
				wrap_tm_compact, NULL, 0) != 1) {
		LM_ERR("failed to add tm TMCB_PRE_SEND_BUFFER callback\n");
		msg->msg_flags |= FL_TM_CB_REGISTERED;
		goto error;
	}

	/* we do not release the whitelist here, as it will be used later by the
	 * tm callbacks */
	return 1;

error:
	SET_GLOBAL_CTX(compact_ctx_pos, NULL);
	free_mc_compact_args(mc_compact_args_p);
	return -1;
}

/*
 *