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Magic number

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Atlante45 2015-09-22 18:06:47 +02:00
parent 91c779ddd8
commit f1a9aba704
3 changed files with 7 additions and 6 deletions
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7
libraries/networking/src/udt/Packet.cpp
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@ -124,7 +124,8 @@ static const uint32_t RELIABILITY_BIT_MASK = uint32_t(1) << (SEQUENCE_NUMBER_BIT
static const uint32_t MESSAGE_BIT_MASK = uint32_t(1) << (SEQUENCE_NUMBER_BITS - 3);
static const uint32_t BIT_FIELD_MASK = CONTROL_BIT_MASK | RELIABILITY_BIT_MASK | MESSAGE_BIT_MASK;
static const uint32_t PACKET_POSITION_MASK = uint32_t(0x03) << 30;
static const uint8_t PACKET_POSITION_OFFSET = 30;
static const uint32_t PACKET_POSITION_MASK = uint32_t(0x03) << PACKET_POSITION_OFFSET;
static const uint32_t MESSAGE_NUMBER_MASK = ~PACKET_POSITION_MASK;
void Packet::readHeader() const {
@ -139,7 +140,7 @@ void Packet::readHeader() const {
if (_isPartOfMessage) {
MessageNumberAndBitField* messageNumberAndBitField = seqNumBitField + 1;
_messageNumber = *messageNumberAndBitField & MESSAGE_NUMBER_MASK;
_packetPosition = static_cast<PacketPosition>(*messageNumberAndBitField >> 30);
_packetPosition = static_cast<PacketPosition>(*messageNumberAndBitField >> PACKET_POSITION_OFFSET);
}
}
@ -164,6 +165,6 @@ void Packet::writeHeader() const {
MessageNumberAndBitField* messageNumberAndBitField = seqNumBitField + 1;
*messageNumberAndBitField = _messageNumber;
*messageNumberAndBitField |= _packetPosition << 30;
*messageNumberAndBitField |= _packetPosition << PACKET_POSITION_OFFSET;
}
}

4
libraries/networking/src/udt/Packet.h
View file

@ -28,7 +28,7 @@ public:
// NOTE: The SequenceNumber is only actually 29 bits to leave room for a bit field
using SequenceNumberAndBitField = uint32_t;
// NOTE: The MessageNumber is only actually 29 bits to leave room for a bit field
// NOTE: The MessageNumber is only actually 30 bits to leave room for a bit field
using MessageNumber = uint32_t;
using MessageNumberAndBitField = uint32_t;
@ -83,7 +83,7 @@ private:
// Simple holders to prevent multiple reading and bitwise ops
mutable bool _isReliable { false };
mutable bool _isPartOfMessage { false };
mutable SequenceNumber _sequenceNumber;
mutable SequenceNumber _sequenceNumber { 0 };
mutable PacketPosition _packetPosition { PacketPosition::ONLY };
mutable MessageNumber _messageNumber { 0 };
};

2
libraries/networking/src/udt/PacketQueue.cpp
View file

@ -17,7 +17,7 @@
using namespace udt;
PacketQueue::MessageNumber PacketQueue::getNextMessageNumber() {
MessageNumber PacketQueue::getNextMessageNumber() {
static const MessageNumber MAX_MESSAGE_NUMBER = MessageNumber(1) << MESSAGE_NUMBER_BITS;
_currentMessageNumber = (_currentMessageNumber + 1) % MAX_MESSAGE_NUMBER;
return _currentMessageNumber;