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/**
* @file src/sdp.c SDP functions
*
* Copyright (C) 2011 Creytiv.com
*/
#include <stdlib.h>
#include <re.h>
#include <baresip.h>
#include "core.h"
uint32_t sdp_media_rattr_u32(const struct sdp_media *m, const char *name)
{
const char *attr = sdp_media_rattr(m, name);
return attr ? atoi(attr) : 0;
}
/*
* Get a remote attribute from the SDP. Try the media-level first,
* and if it does not exist then try session-level.
*/
const char *sdp_rattr(const struct sdp_session *s, const struct sdp_media *m,
const char *name)
{
const char *x;
x = sdp_media_rattr(m, name);
if (x)
return x;
x = sdp_session_rattr(s, name);
if (x)
return x;
return NULL;
}
/* RFC 4572 */
int sdp_fingerprint_decode(const char *attr, struct pl *hash,
uint8_t *md, size_t *sz)
{
struct pl f;
const char *p;
int err;
if (!attr || !hash)
return EINVAL;
err = re_regex(attr, str_len(attr), "[^ ]+ [0-9A-F:]+", hash, &f);
if (err)
return err;
if (md && sz) {
if (*sz < (f.l+1)/3)
return EOVERFLOW;
for (p = f.p; p < (f.p+f.l); p += 3) {
*md++ = ch_hex(p[0]) << 4 | ch_hex(p[1]);
}
*sz = (f.l+1)/3;
}
return 0;
}
bool sdp_media_has_media(const struct sdp_media *m)
{
bool has;
has = sdp_media_rformat(m, NULL) != NULL;
if (has)
return sdp_media_rport(m) != 0;
return false;
}
/**
* Find a dynamic payload type that is not used
*
* @param m SDP Media
*
* @return Unused payload type, -1 if no found
*/
int sdp_media_find_unused_pt(const struct sdp_media *m)
{
int pt;
for (pt = PT_DYN_MAX; pt>=PT_DYN_MIN; pt--) {
if (!sdp_media_format(m, false, NULL, pt, NULL, -1, -1))
return pt;
}
return -1;
}
const struct sdp_format *sdp_media_format_cycle(struct sdp_media *m)
{
struct sdp_format *sf;
struct list *lst;
again:
sf = (struct sdp_format *)sdp_media_rformat(m, NULL);
if (!sf)
return NULL;
lst = sf->le.list;
/* move top-most codec to end of list */
list_unlink(&sf->le);
list_append(lst, &sf->le, sf);
sf = (struct sdp_format *)sdp_media_rformat(m, NULL);
if (!str_casecmp(sf->name, telev_rtpfmt))
goto again;
return sf;
}
static void decode_part(const struct pl *part, struct mbuf *mb)
{
struct pl hdrs, body;
if (re_regex(part->p, part->l, "\r\n\r\n[^]+", &body))
return;
hdrs.p = part->p;
hdrs.l = body.p - part->p - 2;
if (0 == re_regex(hdrs.p, hdrs.l, "application/sdp")) {
mb->pos += (body.p - (char *)mbuf_buf(mb));
mb->end = mb->pos + body.l;
}
}
/**
* Decode a multipart/mixed message and find the part with application/sdp
*/
int sdp_decode_multipart(const struct pl *ctype_prm, struct mbuf *mb)
{
struct pl bnd, s, e, p;
char expr[64];
int err;
if (!ctype_prm || !mb)
return EINVAL;
/* fetch the boundary tag, excluding quotes */
err = re_regex(ctype_prm->p, ctype_prm->l,
"boundary=[~]+", &bnd);
if (err)
return err;
if (re_snprintf(expr, sizeof(expr), "--%r[^]+", &bnd) < 0)
return ENOMEM;
/* find 1st boundary */
err = re_regex((char *)mbuf_buf(mb), mbuf_get_left(mb), expr, &s);
if (err)
return err;
/* iterate over each part */
while (s.l > 2) {
if (re_regex(s.p, s.l, expr, &e))
return 0;
p.p = s.p + 2;
p.l = e.p - p.p - bnd.l - 2;
/* valid part in "p" */
decode_part(&p, mb);
s = e;
}
return 0;
}
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