added exception generation if LZ4 decompression has problems

			int buffsize = LZ4_decompress_safe((const char*)stream, (char*)tmpbuff, size(), dmax);

			if(!buffsize)

			{

				cout << "LZ4 decompression error" << endl;

				delete tmpbuff;

				throw new PacketException("LZ4 decompression error");

				return 0;

			}

			if(buffsize < 0) {

				delete tmpbuff;

				throw new PacketException("LZ4 decompression error: the source stream is malformed");

			}

			byte* decompbuff = new byte[buffsize];

			memcpy(decompbuff, tmpbuff, buffsize);

			b = ByteStreamPtr(new ByteStream(decompbuff, buffsize, bigendian));