sign: fix PayloadCksum for odd boundary between protocols
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@ -22,6 +22,8 @@ along with this program. If not, see <http://www.gnu.org/licenses/>
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#include "protocollistiterator.h"
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#include "streambase.h"
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#include "byteswap.h"
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#include <qendian.h>
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/*!
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@ -972,18 +974,29 @@ out:
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quint32 AbstractProtocol::protocolFramePayloadCksum(int streamIndex,
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CksumType cksumType, CksumScope cksumScope) const
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{
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quint32 sum = 0;
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quint32 sum;
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quint16 cksum;
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AbstractProtocol *p = next;
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Q_ASSERT(cksumType == CksumIp);
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while (p)
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{
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if (!p)
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return 0xFFFF;
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cksum = p->protocolFrameCksum(streamIndex, cksumType);
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sum += (quint16) ~cksum;
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sum = (quint16) ~cksum;
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if (cksumScope == CksumScopeAdjacentProtocol)
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goto out;
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p = p->next;
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while (p)
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{
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// when combining cksums, a non-first protocol starting at odd offset
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// needs a byte swap (see RFC 1071 section(s) 2A, 2B)
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cksum = p->protocolFrameCksum(streamIndex, cksumType);
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if (p->protocolFrameOffset(streamIndex) & 0x1)
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cksum = swap16(cksum);
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sum += (quint16) ~cksum;
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p = p->next;
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}
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@ -998,7 +1011,9 @@ out:
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while(sum>>16)
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sum = (sum & 0xFFFF) + (sum >> 16);
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return (quint16) ~sum;
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cksum = (quint16) ~sum;
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qDebug("%s: cksum = %u", __FUNCTION__, cksum);
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return cksum;
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}
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// Stein's binary GCD algo - from wikipedia
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