EtherDelta Trade Logic

EtherDelta Trade Logic.sol

mapping (address => mapping (bytes32 => bool)) public orders;
mapping (address => mapping (bytes32 => uint)) public orderFills;

function trade(address tokenGet, uint amountGet, address tokenGive, uint amountGive, uint expires, uint nonce, address user, uint8 v, bytes32 r, bytes32 s, uint amount) {
  bytes32 hash = sha256(this, tokenGet, amountGet, tokenGive, amountGive, expires, nonce);
  if (!(
    (orders[user][hash] || ecrecover(sha3("\x19Ethereum Signed Message:\n32", hash),v,r,s) == user) &&
    block.number <= expires &&
    safeAdd(orderFills[user][hash], amount) <= amountGet
  )) throw;
  tradeBalances(tokenGet, amountGet, tokenGive, amountGive, user, amount);
  orderFills[user][hash] = safeAdd(orderFills[user][hash], amount);
  Trade(tokenGet, amount, tokenGive, amountGive * amount / amountGet, user, msg.sender);
}