add ability to throw to fromHex

alethzero/MainWin.cpp

@@ -1330,15 +1330,15 @@ void Main::on_inject_triggered()
 	bytes b;
 	try
 	{
-		b = fromHex(s.toStdString());
+		b = fromHex(s.toStdString(), true);
 	}
-	catch(BadHexCharacter& _e)
+	catch (BadHexCharacter& _e)
 	{
 		cnote << "invalid hex character, transaction rejected";
 		cnote << boost::diagnostic_information(_e);
 		return;
 	}
-	catch(...)
+	catch (...)
 	{
 		cnote << "transaction rejected";
 		return;

libdevcore/CommonData.cpp

@@ -78,7 +78,7 @@ int dev::fromHex(char _i)
 	BOOST_THROW_EXCEPTION(BadHexCharacter() << errinfo_invalidSymbol(_i));
 }
 
-bytes dev::fromHex(std::string const& _s)
+bytes dev::fromHex(std::string const& _s, bool _throw)
 {
 	unsigned s = (_s[0] == '0' && _s[1] == 'x') ? 2 : 0;
 	std::vector<uint8_t> ret;
@@ -96,7 +96,8 @@ bytes dev::fromHex(std::string const& _s)
 #ifndef BOOST_NO_EXCEPTIONS
 			cwarn << boost::current_exception_diagnostic_information(); 
 #endif
-			throw;
+			if (_throw)
+				throw;
 		}
 	for (unsigned i = s; i < _s.size(); i += 2)
 		try
@@ -108,7 +109,8 @@ bytes dev::fromHex(std::string const& _s)
 #ifndef BOOST_NO_EXCEPTIONS
 			cwarn << boost::current_exception_diagnostic_information();
 #endif
-			throw;
+			if (_throw)
+				throw;
 		}
 	return ret;
 }

libdevcore/CommonData.h

@@ -53,7 +53,8 @@ int fromHex(char _i);
 
 /// Converts a (printable) ASCII hex string into the corresponding byte stream.
 /// @example fromHex("41626261") == asBytes("Abba")
-bytes fromHex(std::string const& _s);
+/// If _throw = false, it replaces bad hex characters with 0's, otherwise it will throw an exception.
+bytes fromHex(std::string const& _s, bool _throw = false);
 
 #if 0
 std::string toBase58(bytesConstRef _data);