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/*
Copyright 2018 ZeroEx Intl.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
pragma solidity ^0.4.24;
import "./LibEIP712.sol";
contract LibOrder is
LibEIP712
{
// Hash for the EIP712 Order Schema
bytes32 constant EIP712_ORDER_SCHEMA_HASH = keccak256(abi.encodePacked(
"Order(",
"address makerAddress,",
"address takerAddress,",
"address feeRecipientAddress,",
"address senderAddress,",
"uint256 makerAssetAmount,",
"uint256 takerAssetAmount,",
"uint256 makerFee,",
"uint256 takerFee,",
"uint256 expirationTimeSeconds,",
"uint256 salt,",
"bytes makerAssetData,",
"bytes takerAssetData",
")"
));
// A valid order remains fillable until it is expired, fully filled, or cancelled.
// An order's state is unaffected by external factors, like account balances.
enum OrderStatus {
INVALID, // Default value
INVALID_MAKER_ASSET_AMOUNT, // Order does not have a valid maker asset amount
INVALID_TAKER_ASSET_AMOUNT, // Order does not have a valid taker asset amount
FILLABLE, // Order is fillable
EXPIRED, // Order has already expired
FULLY_FILLED, // Order is fully filled
CANCELLED // Order has been cancelled
}
struct Order {
address makerAddress;
address takerAddress;
address feeRecipientAddress;
address senderAddress;
uint256 makerAssetAmount;
uint256 takerAssetAmount;
uint256 makerFee;
uint256 takerFee;
uint256 expirationTimeSeconds;
uint256 salt;
bytes makerAssetData;
bytes takerAssetData;
}
struct OrderInfo {
// See LibStatus for a complete description of order statuses
uint8 orderStatus;
// Keccak-256 EIP712 hash of the order
bytes32 orderHash;
// Amount of order that has been filled
uint256 orderTakerAssetFilledAmount;
}
/// @dev Calculates Keccak-256 hash of the order.
/// @param order The order structure.
/// @return Keccak-256 EIP712 hash of the order.
function getOrderHash(Order memory order)
internal
view
returns (bytes32 orderHash)
{
orderHash = hashEIP712Message(hashOrder(order));
return orderHash;
}
/// @dev Calculates EIP712 hash of the order.
/// @param order The order structure.
/// @return EIP712 hash of the order.
function hashOrder(Order memory order)
internal
pure
returns (bytes32 result)
{
bytes32 schemaHash = EIP712_ORDER_SCHEMA_HASH;
bytes32 makerAssetDataHash = keccak256(order.makerAssetData);
bytes32 takerAssetDataHash = keccak256(order.takerAssetData);
assembly {
// Backup
let temp1 := mload(sub(order, 32))
let temp2 := mload(add(order, 320))
let temp3 := mload(add(order, 352))
// Hash in place
mstore(sub(order, 32), schemaHash)
mstore(add(order, 320), makerAssetDataHash)
mstore(add(order, 352), takerAssetDataHash)
result := keccak256(sub(order, 32), 416)
// Restore
mstore(sub(order, 32), temp1)
mstore(add(order, 320), temp2)
mstore(add(order, 352), temp3)
}
return result;
}
}
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