NameReg

gistfile1.txt

import "owned";

contract NameReg is owned {
  	event AddressRegistered(address indexed account);
  	event AddressDeregistered(address indexed account);

	function NameReg() {
		toName[this] = "NameReg";
		toAddress["NameReg"] = this;
		AddressRegistered(this);
	}

	function register(bytes32 name) {
		// Don't allow the same name to be overwritten.
		if (toAddress[name] != address(0))
			return;
		// Unregister previous name if there was one.
		if (toName[msg.sender] != "")
			toAddress[toName[msg.sender]] = 0;
			
		toName[msg.sender] = name;
		toAddress[name] = msg.sender;
		AddressRegistered(msg.sender);
	}

	function unregister() {
		bytes32 n = toName[msg.sender];
		if (n == "")
			return;
		AddressDeregistered(toAddress[n]);
		toName[msg.sender] = "";
		toAddress[n] = address(0);
	}

	function addressOf(bytes32 name) constant returns (address addr) {
		return toAddress[name];
	}

	function nameOf(address addr) constant returns (bytes32 name) {
		return toName[addr];
	}
	
	mapping (address => bytes32) toName;
	mapping (bytes32 => address) toAddress;
}