Improvements to file transfer:

- corrected 2 potential flaws of swarming causing request of unavailable data (This should normally be taken care of on the server side!)
- improved swarming test code with fault simulation
- only ask CRC32 maps to peers that have a complete file.
 


git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@4947 b45a01b8-16f6-495d-af2f-9b41ad6348cc

libretroshare/src/ft/ftchunkmap.cc

@@ -190,12 +190,12 @@ bool ChunkMap::getDataChunk(const std::string& peer_id,uint32_t size_hint,ftChun
 
 	if(it == _active_chunks_feed.end())		
 	{
+		SourceChunksInfo *sci = getSourceChunksInfo(peer_id) ;
+
 		// 0 - Look into other pending chunks and slice from here.
 		//
 		for(std::map<std::string,Chunk>::iterator pit(_active_chunks_feed.begin());pit!=_active_chunks_feed.end();++pit)
 		{
-			SourceChunksInfo *sci = getSourceChunksInfo(pit->first) ;
-
 			if(sci->is_full || sci->cmap[pit->second._start / _chunk_size])
 			{
 				it = pit ;