278 lines
9.1 KiB
C++
278 lines
9.1 KiB
C++
/*
|
|
PIP - Platform Independent Primitives
|
|
Packets extractor
|
|
Copyright (C) 2014 Ivan Pelipenko peri4ko@gmail.com
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "pipacketextractor.h"
|
|
|
|
|
|
/** \class PIPacketExtractor
|
|
* \brief Packets extractor
|
|
* \details
|
|
* \section PIPacketExtractor_sec0 Synopsis
|
|
* This class implements packet recognition by header and custom validating
|
|
* algorithm from data stream. Stream is formed from child %PIIODevice
|
|
* passed from contructor or with function \a setDevice().
|
|
*
|
|
* \section PIPacketExtractor_sec1 Principle of work
|
|
* %PIPacketExtractor works with child %PIIODevice. \a read and \a write
|
|
* functions directly call child device functions. You should start threaded
|
|
* read of \b extractor to proper work. Extractor read data from child device,
|
|
* form continuous buffer and analyze it.
|
|
*
|
|
* \subsection PIPacketExtractor_sec1_0 Analysis
|
|
* There is three parameters:
|
|
* * header content
|
|
* * header size
|
|
* * payload size
|
|
*
|
|
* Extractor can detect packet with compare your header with readed data.
|
|
* It is default implementation of function \a packetHeaderValidate().
|
|
* If header validating passed, function \a packetValidate() will be called.
|
|
* If either of this function return \b false extractor shifts by one byte
|
|
* and takes next header. If both functions returns \b true extractor shifts
|
|
* by whole packet size.
|
|
* \image html packet_detection.png
|
|
*
|
|
* \subsection PIPacketExtractor_sec1_1 Variants
|
|
* If header size = 0 and payload size = 0 there is no analysis will be done,
|
|
* and function \a packetValidate() anyway will be called immediately after
|
|
* successfully read from child device. \n
|
|
* If header size = 0 but payload size != 0 extractor will be call function
|
|
* \a packetValidate() each payload size bytes.
|
|
*
|
|
* */
|
|
|
|
REGISTER_DEVICE(PIPacketExtractor);
|
|
|
|
|
|
PIPacketExtractor::PIPacketExtractor(PIIODevice * device_, PIPacketExtractor::SplitMode mode) {
|
|
init_();
|
|
setDevice(device_);
|
|
setSplitMode(mode);
|
|
}
|
|
|
|
|
|
void PIPacketExtractor::init_() {
|
|
ret_func_header = ret_func_footer = 0;
|
|
setPayloadSize(0);
|
|
setTimeout(100);
|
|
setThreadedReadBufferSize(65536);
|
|
setBufferSize(65536);
|
|
setDevice(0);
|
|
setPacketSize(0);
|
|
setSplitMode(None);
|
|
allReaded = addSize = curInd = missed = footerInd = 0;
|
|
header_found = false;
|
|
}
|
|
|
|
|
|
void PIPacketExtractor::propertyChanged(const PIString &) {
|
|
packetSize_ = property("packetSize").toInt();
|
|
mode_ = (SplitMode)(property("splitMode").toInt());
|
|
dataSize = property("payloadSize").toInt();
|
|
src_header = property("header").toByteArray();
|
|
src_footer = property("footer").toByteArray();
|
|
packetSize_hf = src_header.size_s() + src_footer.size_s() + payloadSize();
|
|
}
|
|
|
|
|
|
void PIPacketExtractor::setDevice(PIIODevice * device_) {
|
|
dev = device_;
|
|
if (dev == 0) return;
|
|
}
|
|
|
|
|
|
void PIPacketExtractor::setPayloadSize(int size) {
|
|
setProperty("payloadSize", size);
|
|
dataSize = size;
|
|
packetSize_hf = src_header.size_s() + src_footer.size_s() + payloadSize();
|
|
}
|
|
|
|
|
|
void PIPacketExtractor::setHeader(const PIByteArray & data) {
|
|
setProperty("header", data);
|
|
src_header = data;
|
|
packetSize_hf = src_header.size_s() + src_footer.size_s() + payloadSize();
|
|
}
|
|
|
|
|
|
void PIPacketExtractor::setFooter(const PIByteArray & data) {
|
|
setProperty("footer", data);
|
|
src_footer = data;
|
|
packetSize_hf = src_header.size_s() + src_footer.size_s() + payloadSize();
|
|
}
|
|
|
|
|
|
bool PIPacketExtractor::threadedRead(uchar * readed, int size_) {
|
|
//piCout << "readed" << size_;
|
|
int ss;
|
|
switch (mode_) {
|
|
case PIPacketExtractor::None:
|
|
packetReceived(readed, size_);
|
|
break;
|
|
case PIPacketExtractor::Header:
|
|
tmpbuf.append(readed, size_);
|
|
ss = src_header.size_s() + dataSize;
|
|
while (tmpbuf.size_s() >= ss) {
|
|
while (!validateHeader(src_header.data(), tmpbuf.data(), src_header.size_s())) {
|
|
tmpbuf.pop_front();
|
|
++missed;
|
|
if (tmpbuf.size_s() < ss) return true;
|
|
}
|
|
while (!validatePayload(tmpbuf.data(src_header.size_s()), dataSize)) {
|
|
tmpbuf.pop_front();
|
|
++missed;
|
|
if (tmpbuf.size_s() < ss) return true;
|
|
}
|
|
packetReceived(tmpbuf.data(), ss);
|
|
tmpbuf.remove(0, ss);
|
|
}
|
|
break;
|
|
case PIPacketExtractor::Footer:
|
|
/*memcpy(buffer.data(allReaded), readed, size_);
|
|
allReaded += size_;
|
|
footer_ = (mode_ == PIPacketExtractor::Footer);
|
|
while (allReaded >= packetSize_hf + addSize && allReaded > 0) {
|
|
if (!src_header.isEmpty()) {
|
|
if (allReaded + curInd >= buffer_size) {
|
|
memcpy(sbuffer.data(), buffer.data(), buffer_size);
|
|
memcpy(buffer.data(), sbuffer.data(buffer_size - packetSize_hf), allReaded);
|
|
allReaded = packetSize_hf;
|
|
addSize = curInd = 0;
|
|
}
|
|
bool brk = false;
|
|
while (!validateHeader((uchar * )(footer_ ? src_footer.data() : src_header.data()), buffer.data(curInd + (footer_ ? dataSize : 0)), footer_ ? src_footer.size_s() : src_header.size_s())) {
|
|
++curInd; ++missed;
|
|
if (packetSize_hf > 0) missed_packets = missed / packetSize_hf;
|
|
if (curInd > addSize) {
|
|
addSize += packetSize_hf;
|
|
brk = true;
|
|
break;
|
|
}
|
|
}
|
|
if (brk) continue;
|
|
//memcpy(mheader.data(), buffer.data(curInd + (footer_ ? dataSize : 0)), src_header.size_s());
|
|
if (!src_header.isEmpty()) memcpy(src_header.data(), buffer.data(curInd), src_header.size_s());
|
|
if (!validatePayload(buffer.data(curInd + src_header.size_s()), dataSize)) {
|
|
++curInd; ++missed;
|
|
if (packetSize_hf > 0) missed_packets = missed / packetSize_hf;
|
|
continue;
|
|
}
|
|
packetReceived(buffer.data(curInd), packetSize_hf);
|
|
memcpy(sbuffer.data(), buffer.data(), allReaded);
|
|
memcpy(buffer.data(), sbuffer.data(packetSize_hf + curInd), allReaded);
|
|
allReaded -= packetSize_hf + curInd;
|
|
curInd = addSize = 0;
|
|
} else {
|
|
if (dataSize == 0) {
|
|
if (validatePayload(buffer.data(), size_))
|
|
packetReceived(buffer.data(), size_);
|
|
memcpy(sbuffer.data(), buffer.data(), allReaded);
|
|
memcpy(buffer.data(), sbuffer.data(size_), allReaded);
|
|
allReaded -= size_;
|
|
} else {
|
|
if (validatePayload(buffer.data(), dataSize))
|
|
packetReceived(buffer.data(), dataSize);
|
|
memcpy(sbuffer.data(), buffer.data(), allReaded);
|
|
memcpy(buffer.data(), sbuffer.data(packetSize_hf), allReaded);
|
|
allReaded -= packetSize_hf;
|
|
}
|
|
}
|
|
}*/
|
|
tmpbuf.append(readed, size_);
|
|
ss = src_footer.size_s() + dataSize;
|
|
while (tmpbuf.size_s() >= ss) {
|
|
while (!validateFooter(src_footer.data(), tmpbuf.data(dataSize), src_footer.size_s())) {
|
|
tmpbuf.pop_front();
|
|
++missed;
|
|
if (tmpbuf.size_s() < ss) return true;
|
|
}
|
|
while (!validatePayload(tmpbuf.data(), dataSize)) {
|
|
tmpbuf.pop_front();
|
|
++missed;
|
|
if (tmpbuf.size_s() < ss) return true;
|
|
}
|
|
packetReceived(tmpbuf.data(), ss);
|
|
tmpbuf.remove(0, ss);
|
|
}
|
|
break;
|
|
case PIPacketExtractor::HeaderAndFooter:
|
|
tmpbuf.append(readed, size_);
|
|
ss = src_header.size_s() + src_footer.size_s();
|
|
while (tmpbuf.size_s() >= ss) {
|
|
if (!header_found) {
|
|
if (tmpbuf.size_s() < ss) return true;
|
|
while (!validateHeader(src_header.data(), tmpbuf.data(), src_header.size_s())) {
|
|
tmpbuf.pop_front();
|
|
++missed;
|
|
if (tmpbuf.size_s() < ss) return true;
|
|
}
|
|
header_found = true;
|
|
footerInd = src_header.size_s();
|
|
} else {
|
|
if (tmpbuf.size_s() < footerInd + src_footer.size_s()) return true;
|
|
while (!validateFooter(src_footer.data(), tmpbuf.data(footerInd), src_footer.size_s())) {
|
|
++footerInd;
|
|
if (tmpbuf.size_s() < footerInd + src_footer.size_s()) return true;
|
|
}
|
|
//piCout << "footer found at" << footerInd;
|
|
header_found = false;
|
|
if (!validatePayload(tmpbuf.data(src_header.size_s()), footerInd - src_header.size_s())) {
|
|
tmpbuf.pop_front();
|
|
++missed;
|
|
continue;
|
|
}
|
|
packetReceived(tmpbuf.data(), footerInd + src_footer.size_s());
|
|
tmpbuf.remove(0, footerInd + src_footer.size_s());
|
|
footerInd = src_header.size_s();
|
|
}
|
|
}
|
|
break;
|
|
case PIPacketExtractor::Timeout:
|
|
memcpy(buffer.data(), readed, size_);
|
|
trbuf = dev->readForTime(time_);
|
|
memcpy(buffer.data(size_), trbuf.data(), trbuf.size());
|
|
if (size_ + trbuf.size() > 0)
|
|
packetReceived(buffer.data(), size_ + trbuf.size());
|
|
break;
|
|
case PIPacketExtractor::Size:
|
|
tmpbuf.append(readed, size_);
|
|
if (packetSize_ <= 0) {
|
|
tmpbuf.clear();
|
|
return true;
|
|
}
|
|
while (tmpbuf.size_s() >= packetSize_) {
|
|
if (!validatePayload(tmpbuf.data(), packetSize_)) {
|
|
tmpbuf.pop_front();
|
|
++missed;
|
|
missed_packets = missed / packetSize_;
|
|
continue;
|
|
}
|
|
packetReceived(tmpbuf.data(), packetSize_);
|
|
tmpbuf.remove(0, packetSize_);
|
|
}
|
|
break;
|
|
};
|
|
return true;
|
|
}
|
|
|
|
|
|
PIString PIPacketExtractor::constructFullPath() const {
|
|
return fullPathPrefix() + "://";
|
|
}
|