1 files changed, 82 insertions, 0 deletions
diff --git a/packages/contracts/contracts/tokens/ERC721Token/MintableERC721Token.sol b/packages/contracts/contracts/tokens/ERC721Token/MintableERC721Token.sol
new file mode 100644
index 000000000..bc5cd2cc2
--- /dev/null
+++ b/packages/contracts/contracts/tokens/ERC721Token/MintableERC721Token.sol
@@ -0,0 +1,82 @@
+/*
+
+  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 "./ERC721Token.sol";
+
+
+contract MintableERC721Token is
+    ERC721Token
+{
+    /// @dev Function to mint a new token
+    ///      Reverts if the given token ID already exists
+    /// @param _to Address of the beneficiary that will own the minted token
+    /// @param _tokenId ID of the token to be minted by the msg.sender    
+    function _mint(address _to, uint256 _tokenId)
+        internal
+    {
+        require(
+            _to != address(0),
+            "ERC721_ZERO_TO_ADDRESS"
+        );
+
+        address owner = owners[_tokenId];
+        require(
+            owner == address(0),
+            "ERC721_OWNER_ALREADY_EXISTS"
+        );
+
+        owners[_tokenId] = _to;
+        balances[_to] = safeAdd(balances[_to], 1);
+
+        emit Transfer(
+            address(0),
+            _to,
+            _tokenId
+        );
+    }
+
+    /// @dev Function to burn a token
+    ///      Reverts if the given token ID doesn't exist
+    /// @param _owner Owner of token with given token ID
+    /// @param _tokenId ID of the token to be burned by the msg.sender
+    function _burn(address _owner, uint256 _tokenId)
+        internal
+    {
+        require(
+            _owner != address(0),
+            "ERC721_ZERO_OWNER_ADDRESS"
+        );
+
+        address owner = owners[_tokenId];
+        require(
+            owner == _owner,
+            "ERC721_OWNER_MISMATCH"
+        );
+
+        owners[_tokenId] = address(0);
+        balances[_owner] = safeSub(balances[_owner], 1);
+
+        emit Transfer(
+            _owner,
+            address(0),
+            _tokenId
+        );
+    }
+}