group.matchpart.cpx

/*
Copyright (c) 2008 Radu Andrei Stefan

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

interface

implementation

uses globals;

int group::matchpart(int eid, string msgid, intvector &filedat, int part, int pof, int &warn)
{
	int i,j;
	//int hasparts=(pof>0);
	int datlen=filedat.size();
	int chosen;
	int reason=0;
	warn=0;
	if (part>pof)
	{
		warn=1;
		if (pof==0) part=0;
		else part%=pof;
	}
	intvector crtids;
	// should be replaced by a better hash to avoid posters that
	// may try stuff against us	
	msgidcrc_t idcrc=crc32(0x1781461a,(unsigned char *) msgid.c_str(),msgid.length());
	
	for (i=0; i<1000; i++)
	{
		filedat[datlen-1]=i;
		j=fis.find(filedat,0);
		if (j<0) break;
		crtids.push_back(j);
	}
	// nothing found, add new
	if (crtids.size()==0) return addnewentry(eid, msgid, idcrc, filedat, part, pof);

	chosen=-1;
	for (i=0; i<(int) crtids.size(); i++)
	{
		int cfid=crtids[i];
		fileinfo &cf=fis.fil[cfid];
		if (cf.parts[0][part]!=0)
		{
			//if (cf.partcrc[part]==idcrc)
			//{
				if (cf.parts[1].size()==0)
				{
					cf.parts[1].resize(pof+1);
					fprintf(errlog,"Duplicates found \n");
					warn=3;
				}
				cf.parts[1][part]=eid+1;
				chosen=cfid;
				stat_duplicatesfound++;
				return cfid;
			/*
			assume by default that this is the same file, split in the same way
			}
			else
			{
				reason=1;
				continue;
			}
			*/
				
		}
		// no more matching, just take the first one
		chosen=cfid;
		break;
		int match1=stringendmatch(msgid,cf.sig,7);
		int match2=stringbeginmatch(msgid,cf.sig,7);
		int match3;
		if (match1>4 || match2>4 || (match1+match2)>6 || cf.flags.idmismatch)
		{
			chosen=cfid;
			break;
		}
		match3=stringsimil(msgid,cf.sig);
		if (match3>9)
		{
			chosen=cfid;
			break;
		}
	}
	if (chosen==-1) for (i=0; i<(int) crtids.size(); i++)
	{
		int cfid=crtids[i];
		fileinfo &cf=fis.fil[cfid];
		if (cf.parts[0][part]!=0) continue;
		if (cf.partsfound<3)
		{
			int match1=stringendmatch(msgid,cf.sig,7);
			int match2=stringbeginmatch(msgid,cf.sig,7);
			int match3=stringsimil(msgid,cf.sig);
			fprintf(errlog,"\nToo few parts in file and no id match");
			fprintf(errlog,", nothing to do but guess\n");
			fprintf(errlog,"   ID:%s ref:%s",msgid.c_str(),cf.sig.c_str());
			fprintf(errlog,"   end:%d, beg:%d, ov:%d\n",match1, match2, match3);
			cf.flags.idmismatch=1;
			chosen=cfid;
			warn=2;
			break;
		}
	}
	// none matched	
	if (chosen==-1)
	{		
		warn=3;
		fprintf(errlog,"\nCreating more files with this name: %s, reason: %d\n",
			artnames.v[filedat[1]].c_str(), reason);
		return addnewentry(eid, msgid, idcrc, filedat, part, pof);
	}
	fileinfo &cf=fis.fil[chosen];
	if (part==0) cf.flags.partstartzero=1;
	cf.partsfound++;
	cf.parts[0][part]=eid+1;
	return chosen;
}

int group::addnewentry(int eid, string msgid, msgidcrc_t idcrc, intvector &filedat, int part, int pof)
{
	int id=fis.find(filedat);
	fileinfo &cf=fis.fil[id];
	cf.info=filedat;
	cf.flags.hasparts=(pof>0);
	cf.parts[0].resize(pof+1);
	if (pof<1) pof=1;
	cf.parts[0][part]=eid+1;
	cf.partsfound=1;
	cf.sig=msgid; // msgid of the first found part is retained
	if (part==0) cf.flags.partstartzero=1;
	return id;
}