Added address_range.cpp.

src/internals.cpp

@@ -187,5 +187,19 @@ bool decrement(IPv4Address &addr) {
 bool decrement(IPv6Address &addr) {
     return decrement_buffer(addr);
 }
+
+IPv4Address last_address_from_mask(IPv4Address addr, IPv4Address mask) {
+    uint32_t addr_int = Endian::be_to_host<uint32_t>(addr),
+            mask_int = Endian::be_to_host<uint32_t>(mask);
+    return IPv4Address(Endian::host_to_be(addr_int | ~mask_int));
+}
+
+IPv6Address last_address_from_mask(IPv6Address addr, const IPv6Address &mask) {
+    IPv6Address::iterator addr_iter = addr.begin();
+    for(IPv6Address::const_iterator it = mask.begin(); it != mask.end(); ++it, ++addr_iter) {
+        *addr_iter = *addr_iter | ~*it;
+    }
+    return addr;
+}
 } // namespace Internals
 } // namespace Tins