Function mc_decompress

modules/compression/compression.c:1686–2032

* Function to decompress a compressed message */

 * Function to decompress a compressed message
 */
static int mc_decompress(struct sip_msg* msg)
{
	#define HDRS_TO_SKIP 4

	int i;
	int j;
	int rc;
	int algo=-1;
	int hdrs_algo=-1;
	int b64_required=-1;

	str msg_body;
	str msg_final;

	str b64_decode={NULL, 0};
	str hdr_b64_decode={NULL,0};
	str uncomp_body={NULL,0};
	str uncomp_hdrs={NULL,0};

	char *new_buf;

	unsigned long temp;

	/* hdr_vec allows to sort the headers. This will help skipping
		these headers when building the new message */
	struct hdr_field *hf;
	struct hdr_field *hdr_vec[HDRS_TO_SKIP];
					/*hdr_vec : 	0 Content-Length
							1 Comp-Hdrs
							2 Headers-Algo
							3 Content-Encoding*/

	memset(hdr_vec, 0, HDRS_TO_SKIP * sizeof(struct hdr_field*));

	if (parse_headers(msg, HDR_EOH_F, 0) != 0) {
		LM_ERR("failed to parse SIP message\n");
		return -1;
	}

	/*If compressed with this module there are great chances that Content-Encoding is last*/
	hdr_vec[3] = msg->last_header;

	if (hdr_vec[3] && !is_content_encoding(hdr_vec[3])) {
		hdr_vec[3] = NULL;
		for (hf = msg->headers; hf; hf = hf->next) {
			if (is_content_encoding(hf)) {
				hdr_vec[3] = hf;
				continue;
			}
			if (hf->type == HDR_OTHER_T &&
				!strncasecmp(hf->name.s, COMP_HDRS,COMP_HDRS_LEN)) {
				hdr_vec[1] = hf;
				continue;
			}

			if (hf->type == HDR_OTHER_T &&
				!strncasecmp(hf->name.s, HDRS_ENCODING,
						sizeof(HDRS_ENCODING)-1)) {