sysrap/tests/test_network_order_ntohl_htonl.cc

0001 #include <sstream>
0002 #include <iostream>
0003 #include <iomanip>
0004 #include <cstdint>
0005 #include <cassert>
0006
0007 // seems htonl dont need this header
0008 //#include <arpa/inet.h>
0009
0010 /**
0011 hexlify
0012 -------
0013
0014 Dump the bytes of an object
0015
0016 **/
0017
0018 std::string hexlify(const void* obj, size_t size, bool reverse)
0019 {
0020     const unsigned char * const bytes = static_cast<const unsigned char *>(obj);
0021     std::stringstream ss ;
0022     for(size_t i=0 ; i < size ; i++) ss << std::setw(2) << std::hex << std::setfill('0') << unsigned(bytes[reverse ? size - 1 - i : i]) ;
0023     return ss.str();
0024 }
0025
0026 /**
0027 test_network_order_ntohl_htonl
0028 --------------------------------
0029
0030 **/
0031
0032 void test_network_order_ntohl_htonl()
0033 {
0034     uint32_t hostlong = 0x12abcdef ;
0035     uint32_t netlong = htonl(hostlong) ;
0036
0037     std::cout
0038        << " std::hex "
0039        << " hostlong " << std::hex << hostlong
0040        << " netlong " << std::hex << netlong
0041        << std::endl
0042        ;
0043
0044     std::cout
0045        << " hexlify "
0046        << " hostlong " << hexlify(&hostlong,4,true)
0047        << " netlong "  << hexlify(&netlong, 4,true)
0048        << std::endl
0049        ;
0050
0051     uint32_t hostlong2 = ntohl(netlong) ;
0052     uint32_t netlong2 = htonl(hostlong2) ;
0053
0054     assert( hostlong == hostlong2 );
0055     assert( netlong == netlong2 );
0056 }
0057
0058 int main(int argc, char** argv)
0059 {
0060     test_network_order_ntohl_htonl();
0061     return 0 ;
0062 }
0063
0064 // gcc test_network_order_ntohl_htonl.cc -lstdc++ -o /tmp/test_network_order_ntohl_htonl && /tmp/test_network_order_ntohl_htonl