test-gint64-packing.c

#include <stdio.h>
#include <glib.h>

static void
try_pack_and_unpack (gint64 number)
{
  gint64 number_unpacked;
  guint32 number_high;
  guint32 number_low;

  g_print ("Packing and unpacking %" G_GINT64_FORMAT "\n", number);
  number_high = number >> 32;
  number_low = number & 0xFFFFFFFF;
  number_unpacked = number_high;
  number_unpacked = (number_unpacked << 32) + number_low;
  g_print ("Got %" G_GINT64_FORMAT "\n", number_unpacked);
}

int main (int argc, char **argv) {

  try_pack_and_unpack (-1000);
  try_pack_and_unpack (-1);
  try_pack_and_unpack (0);
  try_pack_and_unpack (1);
  try_pack_and_unpack (1000);
  try_pack_and_unpack (G_MAXUINT32);
  try_pack_and_unpack ((gint64)G_MAXUINT32 + (gint64)1000);
  try_pack_and_unpack (G_MAXINT64);

  return 0;
}