/*
* sipsdp_write_to_buf()
*
* This function builds the specified SDP in a text buffer and returns
* a pointer to this buffer.
*
* Returns: pointer to buffer - no errors
* NULL - errors were encountered while building
* the SDP. The details of the build failure
* can be determined by enabling SDP debugs
* and by examining SDP library error counters.
*/
char *
sipsdp_write_to_buf (cc_sdp_t *sdp_info, uint32_t *retbytes)
{
flex_string fs;
// uint32_t sdp_len;
sdp_result_e rc;
flex_string_init(&fs);
if (!sdp_info || !sdp_info->src_sdp) {
CCSIP_DEBUG_ERROR(SIP_F_PREFIX"NULL sdp_info or src_sdp\n", __FUNCTION__);
return (NULL);
}
if ((rc = sdp_build(sdp_info->src_sdp, &fs))
!= SDP_SUCCESS) {
CCSIP_DEBUG_TASK(DEB_F_PREFIX"sdp_build rc=%s\n", DEB_F_PREFIX_ARGS(SIP_SDP, __FUNCTION__),
sdp_get_result_name(rc));
flex_string_free(&fs);
*retbytes = 0;
return (NULL);
}
*retbytes = fs.string_length;
/* We are not calling flex_string_free on this, instead returning the buffer
* caller's responsibility to free
*/
return fs.buffer;
}
/*
* sipsdp_write_to_buf()
*
* This function builds the specified SDP in a text buffer and returns
* a pointer to this buffer.
*
* Returns: pointer to buffer - no errors
* NULL - errors were encountered while building
* the SDP. The details of the build failure
* can be determined by enabling SDP debugs
* and by examining SDP library error counters.
*/
char *
sipsdp_write_to_buf (cc_sdp_t *sdp_info, uint32_t *retbytes)
{
const char *fname = "sipsdp_write_to_buf";
char *buf, *new_buf;
char *sdp_buf;
uint32_t sdp_len;
sdp_result_e rc;
if (!sdp_info || !sdp_info->src_sdp) {
CCSIP_DEBUG_ERROR(SIP_F_PREFIX"NULL sdp_info or src_sdp\n", fname);
return (NULL);
}
/*
* Allocate storage for the SDP text
*/
buf = (char *) cpr_malloc(CCSIP_SDP_BUF_SIZE);
if (!buf) {
CCSIP_DEBUG_ERROR(SIP_F_PREFIX"malloc failure\n", fname);
return (NULL);
}
sdp_buf = buf;
if ((rc = sdp_build(sdp_info->src_sdp, &sdp_buf, CCSIP_SDP_BUF_SIZE))
!= SDP_SUCCESS) {
CCSIP_DEBUG_TASK(DEB_F_PREFIX"sdp_build rc=%s\n", DEB_F_PREFIX_ARGS(SIP_SDP, fname),
sdp_get_result_name(rc));
if (rc == SDP_POTENTIAL_SDP_OVERFLOW) {
/* SDP may have been truncated. Issue an extra warning and abort */
CCSIP_DEBUG_ERROR(SIP_F_PREFIX"Build SDP buffer overflow\n", fname);
}
cpr_free(buf);
*retbytes = 0;
return (NULL);
}
/*
* Compute length of SDP
*/
sdp_len = sdp_buf - buf;
/*
* Minimize the memory impact on the SDP buffer by reallocating buffer
* with a smaller size that fits the actual SDP body for the size.
*/
if ((CCSIP_SDP_BUF_SIZE - sdp_len) > 64) {
/*
* Allocate space with NULL string character, the
* output buffer content contains the NULL char but the
* the length represents an actual length of SDP
* without NULL char. The NULL char is added just in case,
* there is code that uses strlen() on the SDP then
* it will terminate properly.
*/
new_buf = (char *) cpr_malloc(sdp_len + 1);
if (new_buf != NULL) {
memcpy(new_buf, buf, sdp_len);
new_buf[sdp_len] = '\0';
cpr_free(buf);
buf = new_buf;
}
}
*retbytes = sdp_len;
return (buf);
}