rem: for (int i = 0; i < string.length(); i++)
add: for (uint i = 0; i < string.length(); i++)
context: void dumpStr(const std::string &string, const char *label = NULL) {	if (label)		printf("%s: ", label);	for (int i = 0; i < string.length(); i++)		printf("%x ", string[i]);	printf("\n");}