/*
    PIP - Platform Independent Primitives
    Packets extractor
    Copyright (C) 2012  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"


PIPacketExtractor::PIPacketExtractor(PIIODevice * device_, void * recHeaderPtr, int recHeaderSize, int recDataSize) {
	ret_func_header = 0;
	setPacketData(recHeaderPtr, recHeaderSize, recDataSize);
	setBufferSize(4096);
	setDevice(device_);
	allReaded = addSize = curInd = 0;
}


void PIPacketExtractor::setDevice(PIIODevice * device_) {
	dev = device_;
	if (dev == 0) return;
}


bool PIPacketExtractor::threadedRead(uchar * readed, int size_) {
	//cout << "extractor readed " << size_ << endl;
	memcpy(buffer.data(allReaded), readed, size_);
	allReaded += size_;
	if (allReaded < packetSize + addSize) return true;
	if (headerSize > 0) {
		if (allReaded + curInd >= buffer_size) {
			memcpy(sbuffer.data(), buffer.data(), buffer_size);
			memcpy(buffer.data(), sbuffer.data(buffer_size - packetSize), allReaded);
			allReaded = packetSize;
			addSize = curInd = 0;
		}
		while (!packetHeaderValidate((uchar * )headerPtr, buffer.data(curInd), headerSize)) {
			curInd++; missed++;
			if (packetSize > 0) missed_packets = missed / packetSize;
			if (curInd > addSize) {
				addSize += packetSize;
				return true;
			}
		}
		memcpy(mheader.data(), buffer.data(curInd + headerSize), headerSize);
		if (!packetValidate(buffer.data(curInd + headerSize), dataSize)) {
			curInd++; missed++;
			if (packetSize > 0) missed_packets = missed / packetSize;
			return true;
		}
		memcpy(sbuffer.data(), buffer.data(), allReaded);
		memcpy(buffer.data(), sbuffer.data(packetSize + curInd), allReaded);
		allReaded -= packetSize + curInd;
		curInd = addSize = 0;
	} else {
		packetValidate(buffer.data(), dataSize);
		memcpy(sbuffer.data(), buffer.data(), allReaded);
		memcpy(buffer.data(), sbuffer.data(packetSize), allReaded);
		allReaded -= packetSize;
	}
	return true;
}