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Fix ControlPackets read/write header

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This commit is contained in:
Atlante45 2015-07-29 20:05:15 -07:00
parent db5e5a4f75
commit da480bcaf0
3 changed files with 13 additions and 27 deletions
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20
libraries/networking/src/udt/ControlPacket.cpp
View file

@ -61,7 +61,7 @@ ControlPacket::ControlPacket(Type type) :
open(QIODevice::ReadWrite);
writeControlBitAndType();
writeType();
}
ControlPacket::ControlPacket(Type type, qint64 size) :
@ -72,7 +72,7 @@ ControlPacket::ControlPacket(Type type, qint64 size) :
open(QIODevice::ReadWrite);
writeControlBitAndType();
writeType();
}
ControlPacket::ControlPacket(std::unique_ptr<char> data, qint64 size, const HifiSockAddr& senderSockAddr) :
@ -106,20 +106,11 @@ void ControlPacket::setType(udt::ControlPacket::Type type) {
writeType();
}
void ControlPacket::writeControlBitAndType() {
ControlBitAndType* bitAndType = reinterpret_cast<ControlBitAndType*>(_packet.get());
// write the control bit by OR'ing the current value with the CONTROL_BIT_MASK
*bitAndType = (*bitAndType | CONTROL_BIT_MASK);
writeType();
}
void ControlPacket::writeType() {
ControlBitAndType* bitAndType = reinterpret_cast<ControlBitAndType*>(_packet.get());
// write the type by OR'ing the new type with the current value & CONTROL_BIT_MASK
*bitAndType = (*bitAndType & CONTROL_BIT_MASK) | (_type << (sizeof(ControlPacket::Type) * 8 - 1));
// We override the control bit here by writing the type but it's okay, it'll always be 1
*bitAndType = CONTROL_BIT_MASK | (ControlBitAndType(_type) << (8 * sizeof(Type)));
}
void ControlPacket::readType() {
@ -128,6 +119,5 @@ void ControlPacket::readType() {
Q_ASSERT_X(bitAndType & CONTROL_BIT_MASK, "ControlPacket::readHeader()", "This should be a control packet");
// read the type
uint32_t oversizeType = (uint32_t) (bitAndType & ~CONTROL_BIT_MASK);
_type = (Type) oversizeType;
_type = (Type) ((bitAndType & ~CONTROL_BIT_MASK) >> (8 * sizeof(Type)));
}

19
libraries/networking/src/udt/Packet.cpp
View file

@ -135,21 +135,16 @@ void Packet::writeHeader() const {
// grab pointer to current SequenceNumberAndBitField
SequenceNumberAndBitField* seqNumBitField = reinterpret_cast<SequenceNumberAndBitField*>(_packet.get());
// 0 for data packets
*seqNumBitField &= ~CONTROL_BIT_MASK;
if (_isPartOfMessage) {
*seqNumBitField |= MESSAGE_BIT_MASK;
} else {
*seqNumBitField &= ~MESSAGE_BIT_MASK;
}
// Write sequence number and reset bit field
Q_ASSERT_X(!((SequenceNumber::Type)_sequenceNumber & BIT_FIELD_MASK),
"Packet::writeHeader()", "Sequence number is overflowing into bit field");
*seqNumBitField = ((SequenceNumber::Type)_sequenceNumber);
if (_isReliable) {
*seqNumBitField |= RELIABILITY_BIT_MASK;
} else {
*seqNumBitField &= ~RELIABILITY_BIT_MASK;
}
// write new value by ORing (old value & BIT_FIELD_MASK) with new seqNum
*seqNumBitField = (*seqNumBitField & BIT_FIELD_MASK) | (SequenceNumber::Type)_sequenceNumber;
if (_isPartOfMessage) {
*seqNumBitField |= MESSAGE_BIT_MASK;
}
}

1
libraries/networking/src/udt/SequenceNumber.h
View file

@ -92,6 +92,7 @@ private:
friend struct std::hash<SequenceNumber>;
};
static_assert(sizeof(SequenceNumber) == sizeof(uint32_t), "SequenceNumber invalid size");
inline bool operator<(const SequenceNumber& a, const SequenceNumber& b) {