try fixing issue #482

Destination.cpp

@@ -9,6 +9,7 @@
 #include "Timestamp.h"
 #include "NetDb.h"
 #include "Destination.h"
+#include "util.h"
 
 namespace i2p
 {
@@ -36,27 +37,29 @@ namespace client
 			auto it = params->find (I2CP_PARAM_INBOUND_TUNNEL_LENGTH);
 			if (it != params->end ())
 			{
-				int len = boost::lexical_cast<int>(it->second);
+
+				int len = i2p::util::lexical_cast<int>(it->second, inboundTunnelLen);
 				if (len > 0)
 				{
 						inboundTunnelLen = len;
-					LogPrint (eLogInfo, "Destination: Inbound tunnel length set to ", len);
 				}
+				LogPrint (eLogInfo, "Destination: Inbound tunnel length set to ", inboundTunnelLen);
 			}	
 			it = params->find (I2CP_PARAM_OUTBOUND_TUNNEL_LENGTH);
 			if (it != params->end ())
 			{
-				int len = boost::lexical_cast<int>(it->second);
+
+				int len = i2p::util::lexical_cast<int>(it->second, outboundTunnelLen);
 				if (len > 0)
 				{
 						outboundTunnelLen = len;
-					LogPrint (eLogInfo, "Destination: Outbound tunnel length set to ", len);
 				}
+				LogPrint (eLogInfo, "Destination: Outbound tunnel length set to ", outboundTunnelLen);
 			}	
 			it = params->find (I2CP_PARAM_INBOUND_TUNNELS_QUANTITY);
 			if (it != params->end ())
 			{
-				int quantity = boost::lexical_cast<int>(it->second);
+				int quantity = i2p::util::lexical_cast<int>(it->second, inboundTunnelsQuantity);
 				if (quantity > 0)
 				{
 					inboundTunnelsQuantity = quantity;
@@ -66,7 +69,7 @@ namespace client
 			it = params->find (I2CP_PARAM_OUTBOUND_TUNNELS_QUANTITY);
 			if (it != params->end ())
 			{
-				int quantity = boost::lexical_cast<int>(it->second);
+				int quantity = i2p::util::lexical_cast<int>(it->second, outboundTunnelsQuantity);
 				if (quantity > 0)
 				{
 					outboundTunnelsQuantity = quantity;
@@ -76,7 +79,7 @@ namespace client
 			it = params->find (I2CP_PARAM_TAGS_TO_SEND);
 			if (it != params->end ())
 			{
-				int tagsToSend = boost::lexical_cast<int>(it->second);
+				int tagsToSend = i2p::util::lexical_cast<int>(it->second, numTags);
 				if (tagsToSend > 0)
 				{
 					numTags = tagsToSend;

util.h

@@ -5,11 +5,25 @@
 #include <string>
 #include <iostream>
 #include <boost/asio.hpp>
+#include <boost/lexical_cast.hpp>
 
 namespace i2p
 {
 namespace util
 {
+
+	/**
+		 wrapper arround boost::lexical_cast that "never" fails
+	 */
+	template <typename T>
+	T lexical_cast(const std::string & str, const T fallback) {
+		try {
+			return boost::lexical_cast<T>(str);
+		} catch ( ... ) {
+			return fallback;
+		}
+	}
+	
 	namespace http
 	{
 		// in (lower case)