mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-10-31 15:07:12 -04:00
141 lines
4.2 KiB
C++
141 lines
4.2 KiB
C++
/*
|
|
|
|
This file is a part of JRTPLIB
|
|
Copyright (c) 1999-2017 Jori Liesenborgs
|
|
|
|
Contact: jori.liesenborgs@gmail.com
|
|
|
|
This library was developed at the Expertise Centre for Digital Media
|
|
(http://www.edm.uhasselt.be), a research center of the Hasselt University
|
|
(http://www.uhasselt.be). The library is based upon work done for
|
|
my thesis at the School for Knowledge Technology (Belgium/The Netherlands).
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a
|
|
copy of this software and associated documentation files (the "Software"),
|
|
to deal in the Software without restriction, including without limitation
|
|
the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
and/or sell copies of the Software, and to permit persons to whom the
|
|
Software is furnished to do so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included
|
|
in all copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
|
|
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
|
IN THE SOFTWARE.
|
|
|
|
*/
|
|
|
|
#include "rtcpsdespacket.h"
|
|
|
|
namespace qrtplib
|
|
{
|
|
|
|
RTCPSDESPacket::RTCPSDESPacket(uint8_t *data, std::size_t datalength) :
|
|
RTCPPacket(SDES, data, datalength)
|
|
{
|
|
knownformat = false;
|
|
currentchunk = 0;
|
|
itemoffset = 0;
|
|
curchunknum = 0;
|
|
|
|
RTCPCommonHeader *hdr = (RTCPCommonHeader *) data;
|
|
std::size_t len = datalength;
|
|
|
|
if (hdr->padding)
|
|
{
|
|
uint8_t padcount = data[datalength - 1];
|
|
if ((padcount & 0x03) != 0) // not a multiple of four! (see rfc 3550 p 37)
|
|
return;
|
|
if (((std::size_t) padcount) >= len)
|
|
return;
|
|
len -= (std::size_t) padcount;
|
|
}
|
|
|
|
if (hdr->count == 0)
|
|
{
|
|
if (len != sizeof(RTCPCommonHeader))
|
|
return;
|
|
}
|
|
else
|
|
{
|
|
int ssrccount = (int) (hdr->count);
|
|
uint8_t *chunk;
|
|
int chunkoffset;
|
|
|
|
if (len < sizeof(RTCPCommonHeader))
|
|
return;
|
|
|
|
len -= sizeof(RTCPCommonHeader);
|
|
chunk = data + sizeof(RTCPCommonHeader);
|
|
|
|
while ((ssrccount > 0) && (len > 0))
|
|
{
|
|
if (len < (sizeof(uint32_t) * 2)) // chunk must contain at least a SSRC identifier
|
|
return; // and a (possibly empty) item
|
|
|
|
len -= sizeof(uint32_t);
|
|
chunkoffset = sizeof(uint32_t);
|
|
|
|
bool done = false;
|
|
while (!done)
|
|
{
|
|
if (len < 1) // at least a zero byte (end of item list) should be there
|
|
return;
|
|
|
|
RTCPSDESHeader *sdeshdr = (RTCPSDESHeader *) (chunk + chunkoffset);
|
|
if (sdeshdr->sdesid == 0) // end of item list
|
|
{
|
|
len--;
|
|
chunkoffset++;
|
|
|
|
std::size_t r = (chunkoffset & 0x03);
|
|
if (r != 0)
|
|
{
|
|
std::size_t addoffset = 4 - r;
|
|
|
|
if (addoffset > len)
|
|
return;
|
|
len -= addoffset;
|
|
chunkoffset += addoffset;
|
|
}
|
|
done = true;
|
|
}
|
|
else
|
|
{
|
|
if (len < sizeof(RTCPSDESHeader))
|
|
return;
|
|
|
|
len -= sizeof(RTCPSDESHeader);
|
|
chunkoffset += sizeof(RTCPSDESHeader);
|
|
|
|
std::size_t itemlen = (std::size_t)(sdeshdr->length);
|
|
if (itemlen > len)
|
|
return;
|
|
|
|
len -= itemlen;
|
|
chunkoffset += itemlen;
|
|
}
|
|
}
|
|
|
|
ssrccount--;
|
|
chunk += chunkoffset;
|
|
}
|
|
|
|
// check for remaining bytes
|
|
if (len > 0)
|
|
return;
|
|
if (ssrccount > 0)
|
|
return;
|
|
}
|
|
|
|
knownformat = true;
|
|
}
|
|
|
|
} // end namespace
|
|
|