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ranges in ack block

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orignal 2022-04-15 16:26:44 -04:00
parent 05946125b5
commit 8c3e716c3f
1 changed files with 24 additions and 2 deletions
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26
libi2pd/SSU2.cpp
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@ -1038,9 +1038,9 @@ namespace transport
if (len < 8) return 0;
buf[0] = eSSU2BlkAck;
uint32_t ackThrough = m_OutOfSequencePackets.empty () ? m_ReceivePacketNum : *m_OutOfSequencePackets.rbegin ();
htobe16buf (buf + 1, 5);
htobe32buf (buf + 3, ackThrough); // Ack Through
uint8_t acnt = 0;
int numRanges = 0;
if (ackThrough)
{
if (m_OutOfSequencePackets.empty ())
@ -1053,10 +1053,32 @@ namespace transport
acnt++;
it++;
}
// ranges
uint32_t lastNum = ackThrough - acnt;
it++;
while (it != m_OutOfSequencePackets.rend () && lastNum > m_ReceivePacketNum && numRanges < 8)
{
if (lastNum - (*it) < 255)
{
buf[7 + numRanges*2] = lastNum - (*it); // NACKs
lastNum = *it;
uint8_t numAcks = 0;
while (it != m_OutOfSequencePackets.rend () && numAcks < 255 && lastNum > m_ReceivePacketNum && *it == lastNum - 1)
{
numAcks++; lastNum--;
it++;
}
buf[7 + numRanges*2 + 1] = numAcks; // Acks
numRanges++; it++;
if (numAcks == 255) break;
}
else
break;
}
}
}
buf[7] = acnt; // acnt
// TODO: ranges
htobe16buf (buf + 1, 5 + numRanges*2);
return 8;
}