# Contract Diff Checker

Contract Name:
CryptoBeastiesToken

Contract Source Code:

File 1 of 1 : CryptoBeastiesToken

```pragma solidity ^0.4.24;

// File: node_modules/openzeppelin-solidity/contracts/math/SafeMath.sol

/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {

/**
* @dev Multiplies two numbers, throws on overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
// Gas optimization: this is cheaper than asserting 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
if (a == 0) {
return 0;
}

c = a * b;
assert(c / a == b);
return c;
}

/**
* @dev Integer division of two numbers, truncating the quotient.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
// assert(b > 0); // Solidity automatically throws when dividing by 0
// uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return a / b;
}

/**
* @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}

/**
* @dev Adds two numbers, throws on overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
c = a + b;
assert(c >= a);
return c;
}
}

// File: node_modules/openzeppelin-solidity/contracts/introspection/ERC165.sol

/**
* @title ERC165
* @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md
*/
interface ERC165 {

/**
* @notice Query if a contract implements an interface
* @param _interfaceId The interface identifier, as specified in ERC-165
* @dev Interface identification is specified in ERC-165. This function
* uses less than 30,000 gas.
*/
function supportsInterface(bytes4 _interfaceId)
external
view
returns (bool);
}

// File: node_modules/openzeppelin-solidity/contracts/token/ERC721/ERC721Basic.sol

/**
* @title ERC721 Non-Fungible Token Standard basic interface
* @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract ERC721Basic is ERC165 {
event Transfer(
address indexed _from,
address indexed _to,
uint256 indexed _tokenId
);
event Approval(
address indexed _owner,
address indexed _approved,
uint256 indexed _tokenId
);
event ApprovalForAll(
address indexed _owner,
address indexed _operator,
bool _approved
);

function balanceOf(address _owner) public view returns (uint256 _balance);
function ownerOf(uint256 _tokenId) public view returns (address _owner);
function exists(uint256 _tokenId) public view returns (bool _exists);

function approve(address _to, uint256 _tokenId) public;
function getApproved(uint256 _tokenId)
public view returns (address _operator);

function setApprovalForAll(address _operator, bool _approved) public;
function isApprovedForAll(address _owner, address _operator)
public view returns (bool);

function transferFrom(address _from, address _to, uint256 _tokenId) public;
function safeTransferFrom(address _from, address _to, uint256 _tokenId)
public;

function safeTransferFrom(
address _from,
address _to,
uint256 _tokenId,
bytes _data
)
public;
}

// File: contracts/ERC721.sol

/**
* @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
* @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract ERC721Enumerable is ERC721Basic {
function totalSupply() public view returns (uint256);
}

/**
* @title ERC-721 Non-Fungible Token Standard, optional metadata extension
* @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract ERC721Metadata is ERC721Basic {
function name() external view returns (string _name);
function symbol() external view returns (string _symbol);
function tokenURI(uint256 _tokenId) public view returns (string);
}

/**
* @title ERC-721 Non-Fungible Token Standard, full implementation interface
* @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract ERC721 is ERC721Basic, ERC721Enumerable, ERC721Metadata {
}

// File: node_modules/openzeppelin-solidity/contracts/token/ERC721/ERC721Receiver.sol

/**
* @title ERC721 token receiver interface
* @dev Interface for any contract that wants to support safeTransfers
* from ERC721 asset contracts.
*/
contract ERC721Receiver {
/**
* @dev Magic value to be returned upon successful reception of an NFT
*  Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`,
*  which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
*/
bytes4 internal constant ERC721_RECEIVED = 0x150b7a02;

/**
* @notice Handle the receipt of an NFT
* @dev The ERC721 smart contract calls this function on the recipient
* after a `safetransfer`. This function MAY throw to revert and reject the
* transfer. Return of other than the magic value MUST result in the
* transaction being reverted.
* Note: the contract address is always the message sender.
* @param _operator The address which called `safeTransferFrom` function
* @param _from The address which previously owned the token
* @param _tokenId The NFT identifier which is being transfered
* @param _data Additional data with no specified format
* @return `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
*/
function onERC721Received(
address _operator,
address _from,
uint256 _tokenId,
bytes _data
)
public
returns(bytes4);
}

// File: node_modules/openzeppelin-solidity/contracts/AddressUtils.sol

/**
* Utility library of inline functions on addresses
*/
library AddressUtils {

/**
* Returns whether the target address is a contract
* @dev This function will return false if invoked during the constructor of a contract,
* as the code is not actually created until after the constructor finishes.
* @param addr address to check
* @return whether the target address is a contract
*/
function isContract(address addr) internal view returns (bool) {
uint256 size;
// XXX Currently there is no better way to check if there is a contract in an address
// than to check the size of the code at that address.
// See https://ethereum.stackexchange.com/a/14016/36603
// for more details about how this works.
// TODO Check this again before the Serenity release, because all addresses will be
// contracts then.
// solium-disable-next-line security/no-inline-assembly
assembly { size := extcodesize(addr) }
return size > 0;
}

}

// File: node_modules/openzeppelin-solidity/contracts/introspection/SupportsInterfaceWithLookup.sol

/**
* @title SupportsInterfaceWithLookup
* @author Matt Condon (@shrugs)
* @dev Implements ERC165 using a lookup table.
*/
contract SupportsInterfaceWithLookup is ERC165 {
bytes4 public constant InterfaceId_ERC165 = 0x01ffc9a7;
/**
* 0x01ffc9a7 ===
*   bytes4(keccak256('supportsInterface(bytes4)'))
*/

/**
* @dev a mapping of interface id to whether or not it's supported
*/
mapping(bytes4 => bool) internal supportedInterfaces;

/**
* @dev A contract implementing SupportsInterfaceWithLookup
* implement ERC165 itself
*/
constructor()
public
{
_registerInterface(InterfaceId_ERC165);
}

/**
* @dev implement supportsInterface(bytes4) using a lookup table
*/
function supportsInterface(bytes4 _interfaceId)
external
view
returns (bool)
{
return supportedInterfaces[_interfaceId];
}

/**
* @dev private method for registering an interface
*/
function _registerInterface(bytes4 _interfaceId)
internal
{
require(_interfaceId != 0xffffffff);
supportedInterfaces[_interfaceId] = true;
}
}

// File: contracts/ERC721BasicToken.sol

/**
* @title ERC721 Non-Fungible Token Standard basic implementation
* @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
*/
contract ERC721BasicToken is SupportsInterfaceWithLookup, ERC721Basic {

bytes4 private constant InterfaceId_ERC721 = 0x80ac58cd;
/*
* 0x80ac58cd ===
*   bytes4(keccak256('balanceOf(address)')) ^
*   bytes4(keccak256('ownerOf(uint256)')) ^
*   bytes4(keccak256('approve(address,uint256)')) ^
*   bytes4(keccak256('getApproved(uint256)')) ^
*   bytes4(keccak256('setApprovalForAll(address,bool)')) ^
*   bytes4(keccak256('isApprovedForAll(address,address)')) ^
*   bytes4(keccak256('transferFrom(address,address,uint256)')) ^
*   bytes4(keccak256('safeTransferFrom(address,address,uint256)')) ^
*   bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)'))
*/

bytes4 private constant InterfaceId_ERC721Exists = 0x4f558e79;
/*
* 0x4f558e79 ===
*   bytes4(keccak256('exists(uint256)'))
*/

using SafeMath for uint256;
using AddressUtils for address;

// Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
// which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
bytes4 private constant ERC721_RECEIVED = 0x150b7a02;

// Mapping from token ID to owner
mapping (uint256 => address) internal tokenOwner;

// Mapping from token ID to approved address
mapping (uint256 => address) internal tokenApprovals;

// Mapping from owner to operator approvals
mapping (address => mapping (address => bool)) internal operatorApprovals;

/**
* @dev Guarantees msg.sender is owner of the given token
* @param _tokenId uint256 ID of the token to validate its ownership belongs to msg.sender
*/
modifier onlyOwnerOf(uint256 _tokenId) {
require(ownerOf(_tokenId) == msg.sender);
_;
}

/**
* @dev Checks msg.sender can transfer a token, by being owner, approved, or operator
* @param _tokenId uint256 ID of the token to validate
*/
modifier canTransfer(uint256 _tokenId) {
require(isApprovedOrOwner(msg.sender, _tokenId)); //, "canTransfer"
_;
}

constructor()
public
{
// register the supported interfaces to conform to ERC721 via ERC165
_registerInterface(InterfaceId_ERC721);
_registerInterface(InterfaceId_ERC721Exists);
}

/**
* @dev Gets the balance of the specified address
* @param _owner address to query the balance of
* @return uint256 representing the amount owned by the passed address
*/
function balanceOf(address _owner) public view returns (uint256);

/**
* @dev Gets the owner of the specified token ID
* @param _tokenId uint256 ID of the token to query the owner of
* @return owner address currently marked as the owner of the given token ID
*/
function ownerOf(uint256 _tokenId) public view returns (address) {
address owner = tokenOwner[_tokenId];
require(owner != address(0));
return owner;
}

/**
* @dev Returns whether the specified token exists
* @param _tokenId uint256 ID of the token to query the existence of
* @return whether the token exists
*/
function exists(uint256 _tokenId) public view returns (bool) {
address owner = tokenOwner[_tokenId];
return owner != address(0);
}

/**
* @dev Approves another address to transfer the given token ID
* The zero address indicates there is no approved address.
* There can only be one approved address per token at a given time.
* Can only be called by the token owner or an approved operator.
* @param _to address to be approved for the given token ID
* @param _tokenId uint256 ID of the token to be approved
*/
function approve(address _to, uint256 _tokenId) public {
address owner = ownerOf(_tokenId);
require(_to != owner); //, "_to eq owner"
require(msg.sender == owner || isApprovedForAll(owner, msg.sender));

tokenApprovals[_tokenId] = _to;
emit Approval(owner, _to, _tokenId);
}

/**
* @dev Gets the approved address for a token ID, or zero if no address set
* @param _tokenId uint256 ID of the token to query the approval of
* @return address currently approved for the given token ID
*/
function getApproved(uint256 _tokenId) public view returns (address) {
return tokenApprovals[_tokenId];
}

/**
* @dev Sets or unsets the approval of a given operator
* An operator is allowed to transfer all tokens of the sender on their behalf
* @param _to operator address to set the approval
* @param _approved representing the status of the approval to be set
*/
function setApprovalForAll(address _to, bool _approved) public {
require(_to != msg.sender);
operatorApprovals[msg.sender][_to] = _approved;
emit ApprovalForAll(msg.sender, _to, _approved);
}

/**
* @dev Tells whether an operator is approved by a given owner
* @param _owner owner address which you want to query the approval of
* @param _operator operator address which you want to query the approval of
* @return bool whether the given operator is approved by the given owner
*/
function isApprovedForAll(
address _owner,
address _operator
)
public
view
returns (bool)
{
return operatorApprovals[_owner][_operator];
}

/**
* @dev Transfers the ownership of a given token ID to another address
* Usage of this method is discouraged, use `safeTransferFrom` whenever possible
* Requires the msg sender to be the owner, approved, or operator
* @param _from current owner of the token
* @param _to address to receive the ownership of the given token ID
* @param _tokenId uint256 ID of the token to be transferred
*/
function transferFrom(
address _from,
address _to,
uint256 _tokenId
)
public
canTransfer(_tokenId)
{
require(_from != address(0)); //, "transferFrom 1"
require(_to != address(0)); //, "transferFrom 2"

clearApproval(_from, _tokenId);
removeTokenFrom(_from, _tokenId);
addTokenTo(_to, _tokenId);

emit Transfer(_from, _to, _tokenId);
}

/**
* @dev Safely transfers the ownership of a given token ID to another address
* If the target address is a contract, it must implement `onERC721Received`,
* which is called upon a safe transfer, and return the magic value
* `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
* the transfer is reverted.
*
* Requires the msg sender to be the owner, approved, or operator
* @param _from current owner of the token
* @param _to address to receive the ownership of the given token ID
* @param _tokenId uint256 ID of the token to be transferred
*/
function safeTransferFrom(
address _from,
address _to,
uint256 _tokenId
)
public
canTransfer(_tokenId)
{
// solium-disable-next-line arg-overflow
safeTransferFrom(_from, _to, _tokenId, "");
}

/**
* @dev Safely transfers the ownership of a given token ID to another address
* If the target address is a contract, it must implement `onERC721Received`,
* which is called upon a safe transfer, and return the magic value
* `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
* the transfer is reverted.
* Requires the msg sender to be the owner, approved, or operator
* @param _from current owner of the token
* @param _to address to receive the ownership of the given token ID
* @param _tokenId uint256 ID of the token to be transferred
* @param _data bytes data to send along with a safe transfer check
*/
function safeTransferFrom(
address _from,
address _to,
uint256 _tokenId,
bytes _data
)
public
canTransfer(_tokenId)
{
transferFrom(_from, _to, _tokenId);
// solium-disable-next-line arg-overflow
require(checkAndCallSafeTransfer(_from, _to, _tokenId, _data));
}

/**
* @dev Returns whether the given spender can transfer a given token ID
* @param _spender address of the spender to query
* @param _tokenId uint256 ID of the token to be transferred
* @return bool whether the msg.sender is approved for the given token ID,
*  is an operator of the owner, or is the owner of the token
*/
function isApprovedOrOwner(
address _spender,
uint256 _tokenId
)
internal
view
returns (bool)
{
address owner = ownerOf(_tokenId);
// Disable solium check because of
// https://github.com/duaraghav8/Solium/issues/175
// solium-disable-next-line operator-whitespace
return (
_spender == owner ||
getApproved(_tokenId) == _spender ||
isApprovedForAll(owner, _spender)
);
}

/**
* @dev Internal function to mint a new token
* Reverts if the given token ID already exists
* @param _to The address that will own the minted token
* @param _tokenId uint256 ID of the token to be minted by the msg.sender
*/
function _mint(address _to, uint256 _tokenId) internal {
require(_to != address(0));
addTokenTo(_to, _tokenId);
emit Transfer(address(0), _to, _tokenId);
}

/**
* @dev Internal function to burn a specific token
* Reverts if the token does not exist
* @param _tokenId uint256 ID of the token being burned by the msg.sender
*/
function _burn(address _owner, uint256 _tokenId) internal {
clearApproval(_owner, _tokenId);
removeTokenFrom(_owner, _tokenId);
emit Transfer(_owner, address(0), _tokenId);
}

/**
* @dev Internal function to clear current approval of a given token ID
* Reverts if the given address is not indeed the owner of the token
* @param _owner owner of the token
* @param _tokenId uint256 ID of the token to be transferred
*/
function clearApproval(address _owner, uint256 _tokenId) internal {
require(ownerOf(_tokenId) == _owner); //, "clearApproval"
if (tokenApprovals[_tokenId] != address(0)) {
tokenApprovals[_tokenId] = address(0);
}
}

/**
* @dev Internal function to add a token ID to the list of a given address
* @param _to address representing the new owner of the given token ID
* @param _tokenId uint256 ID of the token to be added to the tokens list of the given address
*/
function addTokenTo(address _to, uint256 _tokenId) internal {
require(tokenOwner[_tokenId] == address(0)); //, "addTokenTo"
tokenOwner[_tokenId] = _to;
}

/**
* @dev Internal function to remove a token ID from the list of a given address
* @param _from address representing the previous owner of the given token ID
* @param _tokenId uint256 ID of the token to be removed from the tokens list of the given address
*/
function removeTokenFrom(address _from, uint256 _tokenId) internal {
require(ownerOf(_tokenId) == _from); //, "removeTokenFrom"
tokenOwner[_tokenId] = address(0);
}

/**
* @dev Internal function to invoke `onERC721Received` on a target address
* The call is not executed if the target address is not a contract
* @param _from address representing the previous owner of the given token ID
* @param _to target address that will receive the tokens
* @param _tokenId uint256 ID of the token to be transferred
* @param _data bytes optional data to send along with the call
* @return whether the call correctly returned the expected magic value
*/
function checkAndCallSafeTransfer(
address _from,
address _to,
uint256 _tokenId,
bytes _data
)
internal
returns (bool)
{
if (!_to.isContract()) {
return true;
}
bytes4 retval = ERC721Receiver(_to).onERC721Received(
msg.sender, _from, _tokenId, _data);
return (retval == ERC721_RECEIVED);
}
}

// File: contracts/IEntityStorage.sol

interface IEntityStorage {
function storeBulk(uint256[] _tokenIds, uint256[] _attributes) external;
function store(uint256 _tokenId, uint256 _attributes, uint256[] _componentIds) external;
function remove(uint256 _tokenId) external;
function list() external view returns (uint256[] tokenIds);
function getAttributes(uint256 _tokenId) external view returns (uint256 attrs, uint256[] compIds);
function updateAttributes(uint256 _tokenId, uint256 _attributes, uint256[] _componentIds) external;
function totalSupply() external view returns (uint256);
}

// File: contracts/ERC721Token.sol

/**
* @title Full ERC721 Token
* This implementation includes all the required and some optional functionality of the ERC721 standard
* Moreover, it includes approve all functionality using operator terminology
* @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md Customized to support non-transferability.
*/
contract ERC721Token is SupportsInterfaceWithLookup, ERC721BasicToken, ERC721 {

IEntityStorage internal cbStorage;

bytes4 private constant InterfaceId_ERC721Enumerable = 0x780e9d63;
/**
* 0x780e9d63 ===
*   bytes4(keccak256('totalSupply()')) ^
*   bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) ^
*   bytes4(keccak256('tokenByIndex(uint256)'))
*/

bytes4 private constant InterfaceId_ERC721Metadata = 0x5b5e139f;
/**
* 0x5b5e139f ===
*   bytes4(keccak256('name()')) ^
*   bytes4(keccak256('symbol()')) ^
*   bytes4(keccak256('tokenURI(uint256)'))
*/

string internal uriPrefix;

// Token name
string internal name_;

// Token symbol
string internal symbol_;

// Mapping from owner to list of owned token IDs
mapping(address => uint256[]) internal ownedTokens;

// Mapping to index within the ownedTokens array for the owner
mapping(uint256 => uint) internal ownedTokenIndexes;

// Array with transferable Tokens
uint256[] internal transferableTokens;

// Mapping to index within the ownedTokens array for the owner
mapping(uint256 => uint) internal transferableIndexes;

/**
* @dev Constructor function
*/
constructor(string _name, string _symbol, string _uriPrefix, address _storage) public {
require(_storage != address(0), "Storage Address is required");
name_ = _name;
symbol_ = _symbol;

// register the supported interfaces to conform to ERC721 via ERC165
_registerInterface(InterfaceId_ERC721Enumerable);
_registerInterface(InterfaceId_ERC721Metadata);
cbStorage = IEntityStorage(_storage);
uriPrefix = _uriPrefix;
}

/**
* @dev Gets the token name
* @return string representing the token name
*/
function name() external view returns (string) {
return name_;
}

/**
* @dev Gets the token symbol
* @return string representing the token symbol
*/
function symbol() external view returns (string) {
return symbol_;
}

/**
* @dev Returns an URI for a given token ID
* Throws if the token ID does not exist. May return an empty string.
* @param _tokenId uint256 ID of the token to query
*/
function tokenURI(uint256 _tokenId) public view returns (string) {
require(exists(_tokenId));
return strConcat(uriPrefix, uintToString(_tokenId));
}

/**
* @dev Gets the total amount of tokens stored by the contract
* @return uint256 representing the total amount of tokens
*/
function totalSupply() public view returns (uint256) {
return cbStorage.totalSupply();
}

/**
* @dev Internal function to add a token ID to the list owned by a given address
* @param _to address representing the new owner of the token ID
* @param _tokenId uint256 ID of the token to be added
*/
function addTokenTo(address _to, uint256 _tokenId) internal {
super.addTokenTo(_to, _tokenId);

ownedTokens[_to].push(_tokenId);
// index is +1 to avoid Solidity's zero default mapping value
ownedTokenIndexes[_tokenId] = ownedTokens[_to].length;
}

/**
* @dev Internal function to remove a token ID from the list owned by a given address
* @param _from address representing the previous owner of the token ID
* @param _tokenId uint256 ID of the token to be removed
*/
function removeTokenFrom(address _from, uint256 _tokenId) internal {
uint lastTokenIndex = ownedTokens[_from].length;
require(lastTokenIndex > 0);
lastTokenIndex--;

super.removeTokenFrom(_from, _tokenId);

uint256 tokenIndex = ownedTokenIndexes[_tokenId].sub(1);

// reorg the ownedTokens array for this address
uint256 lastTokenId = ownedTokens[_from][lastTokenIndex];

// reposition the last token to its new location
ownedTokens[_from][tokenIndex] = lastTokenId;

// fix the index mapping for the repositioned lastToken
ownedTokenIndexes[lastTokenId] = tokenIndex.add(1);

// empty out the last token position in the array
ownedTokens[_from][lastTokenIndex] = 0;
ownedTokens[_from].length--;
}

/**
* @dev Internal function to burn a specific token
* Reverts if the token does not exist, or is marked transferable
* @param _owner owner address of the token being burned
* @param _tokenId uint256 ID of the token being burned
*/
function _burn(address _owner, uint256 _tokenId) internal {
// cannot burn a token that is up for sale
require(!isTransferable(_tokenId)); //, "_burn"
super._burn(_owner, _tokenId);
cbStorage.remove(_tokenId);
}

/**
* @dev Gets the number of tokens owned by the specified address
* @param _owner address of the token owner
* @return uint256 the number of tokens owned
*/
function balanceOf(address _owner) public view returns (uint256) {
require(_owner != address(0));
return ownedTokens[_owner].length;
}

/**
* @dev List all token Ids that can be transfered
* @return array of token IDs
*/
function listTransferableTokens() public view returns(uint256[]) {
return transferableTokens;
}

/**
* @dev Is Token Transferable
* @param _tokenId uint256 ID of the token
* @return bool is tokenId transferable
*/
function isTransferable(uint256 _tokenId) public view returns (bool) {
return (transferableIndexes[_tokenId] > 0);
}

/**
* @dev Returns whether the given spender can transfer a given token ID
* @param _spender address of the spender to query
* @param _tokenId uint256 ID of the token to be transferred
* @return bool whether the token is transferable and msg.sender is approved for the given token ID,
*  is an operator of the owner, or is the owner of the token
*/
function isApprovedOrOwner(address _spender, uint256 _tokenId) internal view returns (bool) {
address owner = ownerOf(_tokenId);
if (isTransferable(_tokenId)) {
return (_spender == owner || getApproved(_tokenId) == _spender || isApprovedForAll(owner, _spender));
}
return false;
}

/**
* Converts a uint, such aa a token ID number, to a string
*/
function uintToString(uint v) internal pure returns (string str) {
uint maxlength = 100;
bytes memory reversed = new bytes(maxlength);
uint i = 0;
while (v != 0) {
uint remainder = v % 10;
v = v / 10;
reversed[i++] = byte(48 + remainder);
}
bytes memory s = new bytes(i);
for (uint j = 0; j < i; j++) {
s[j] = reversed[i - 1 - j];
}
str = string(s);
}

/**
* Basic smashing together of strings.
*/
function strConcat(string _a, string _b)internal pure returns (string) {
bytes memory _ba = bytes(_a);
bytes memory _bb = bytes(_b);
string memory ab = new string(_ba.length + _bb.length);
bytes memory ba = bytes(ab);
uint k = 0;
for (uint i = 0; i < _ba.length; i++) ba[k++] = _ba[i];
for (i = 0; i < _bb.length; i++) ba[k++] = _bb[i];
return string(ba);
}
}

// File: contracts/Ownable.sol

/**
* @title Ownable
* @dev The Ownable contract has an owner address, and provides basic authorization control
* functions, this simplifies the implementation of "user permissions".
*/
contract Ownable {
address public owner;
address public newOwner;

// mapping for creature Type to Sale
address[] internal controllers;
//mapping(address => address) internal controllers;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

/**
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
constructor() public {
owner = msg.sender;
}

/**
* @dev Throws if called by any account that's not a superuser.
*/
modifier onlyController() {
require(isController(msg.sender), "only Controller");
_;
}

modifier onlyOwnerOrController() {
require(msg.sender == owner || isController(msg.sender), "only Owner Or Controller");
_;
}

/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(msg.sender == owner, "sender address must be the owner's address");
_;
}

/**
* @dev Allows the current owner to transfer control of the contract to a newOwner.
* @param _newOwner The address to transfer ownership to.
*/
function transferOwnership(address _newOwner) public onlyOwner {
require(address(0) != _newOwner, "new owner address must not be the owner's address");
newOwner = _newOwner;
}

/**
* @dev Allows the new owner to confirm that they are taking control of the contract..tr
*/
function acceptOwnership() public {
require(msg.sender == newOwner, "sender address must not be the new owner's address");
emit OwnershipTransferred(owner, msg.sender);
owner = msg.sender;
newOwner = address(0);
}

function isController(address _controller) internal view returns(bool) {
for (uint8 index = 0; index < controllers.length; index++) {
if (controllers[index] == _controller) {
return true;
}
}
return false;
}

function getControllers() public onlyOwner view returns(address[]) {
return controllers;
}

/**
* @dev Allows a new controllers to be added
* @param _controller The address controller.
*/
function addController(address _controller) public onlyOwner {
require(address(0) != _controller, "controller address must not be 0");
require(_controller != owner, "controller address must not be the owner's address");
for (uint8 index = 0; index < controllers.length; index++) {
if (controllers[index] == _controller) {
return;
}
}
controllers.push(_controller);
}

/**
* @dev Allows a new controllers to be added
* @param _controller The address controller.
*/
function removeController(address _controller) public onlyOwner {
require(address(0) != _controller, "controller address must not be 0");
for (uint8 index = 0; index < controllers.length; index++) {
if (controllers[index] == _controller) {
delete controllers[index];
}
}
}
}

// File: contracts/ICryptoBeastiesToken.sol

interface ICryptoBeastiesToken {
function bulk(uint256[] _tokenIds, uint256[] _attributes, address[] _owners) external;
function create(uint256 _tokenId, uint256 _attributes, uint256[] _componentIds, address _owner) external;
function tokensOfOwner(address _owner) external view returns (uint256[] tokens);
function getProperties(uint256 _tokenId) external view returns (uint256 attrs, uint256[] compIds);
function updateAttributes(uint256 _tokenId, uint256 _attributes, uint256[] _componentIds) external;
function updateStorage(address _storage) external;
function listTokens() external view returns (uint256[] tokens);
function setURI(string _uriPrefix) external;
function setTransferable(uint256 _tokenId) external;
function removeTransferable(uint256 _tokenId) external;
}

// File: contracts/CryptoBeastiesToken.sol

/**
* @title CryptoBeasties Full ERC721 Token
* This implementation includes all the required and some optional functionality of the ERC721 standard,
* plus references a separate storage contract for recording the game-specific data for each token.
*/
contract CryptoBeastiesToken is ERC721Token, Ownable, ICryptoBeastiesToken {
using SafeMath for uint256;

address proxyRegistryAddress;

/**
* @dev Constructor function
* @param _storage address for Creature Storage
* @param _uriPrefix string for url prefix
*/
constructor(address _storage, string _uriPrefix)
ERC721Token("CryptoBeasties Token", "CRYB", _uriPrefix, _storage) public {
proxyRegistryAddress = address(0);
}

/**
* @dev Set a Proxy Registry Address, to be used by 3rd-party marketplaces.
* @param _proxyRegistryAddress Address of the marketplace's proxy registry address
*/
function setProxyRegistryAddress(address _proxyRegistryAddress) external onlyOwnerOrController {
proxyRegistryAddress = _proxyRegistryAddress;
}

/**
* @dev Bulk load a number of tokens, as a way of reducing gas fees and migration time.
* @param _tokenIds Array of tokenIds
* @param _attributes Matching array of CryptoBeasties attributes
* @param _owners Matching array of token owner addresses
*/
function bulk(uint256[] _tokenIds, uint256[] _attributes, address[] _owners) external onlyOwnerOrController {
for (uint index = 0; index < _tokenIds.length; index++) {

ownedTokens[_owners[index]].push(_tokenIds[index]);
ownedTokenIndexes[_tokenIds[index]] = ownedTokens[_owners[index]].length;

tokenOwner[_tokenIds[index]] = _owners[index];
emit Transfer(address(0), _owners[index], _tokenIds[index]);
}
cbStorage.storeBulk(_tokenIds, _attributes);
}

/**
* @dev Create CryptoBeasties Token
* @param _tokenId ID of the new token
* @param _attributes CryptoBeasties attributes
* @param _owner address of the token owner
*/
function create(uint256 _tokenId, uint256 _attributes, uint256[] _componentIds, address _owner) external onlyOwnerOrController {
require(_owner != address(0));
require(_attributes > 0);
super._mint(_owner, _tokenId);
cbStorage.store(_tokenId, _attributes, _componentIds);
}

/**
* Override isApprovedForAll to whitelist a 3rd-party marketplace's proxy accounts to enable gas-less listings.
*/
function isApprovedForAll(
address owner,
address operator
)
public
view
returns (bool)
{
if (proxyRegistryAddress != address(0)) {
ProxyRegistry proxyRegistry = ProxyRegistry(proxyRegistryAddress);
if (proxyRegistry.proxies(owner) == operator) {
return true;
}
}

return super.isApprovedForAll(owner, operator);
}

/**
* @dev List all token ids for a owner
* @param _owner address of the token owner
*/
function tokensOfOwner(address _owner) external view returns (uint256[]) {
return ownedTokens[_owner];
}

/**
* @dev List all token ids, an array of their attributes and an array componentIds (i.e. PowerStones)
* @param _owner address for the given token ID
*/
function getOwnedTokenData(
address _owner
)
public
view
returns
(
uint256[] tokens,
uint256[] attrs,
uint256[] componentIds,
bool[] isTransferable
) {

uint256[] memory tokenIds = this.tokensOfOwner(_owner);
uint256[] memory attribs = new uint256[](tokenIds.length);
uint256[] memory firstCompIds = new uint256[](tokenIds.length);
bool[] memory transferable = new bool[](tokenIds.length);

uint256[] memory compIds;

for (uint i = 0; i < tokenIds.length; i++) {
(attribs[i], compIds) = cbStorage.getAttributes(tokenIds[i]);
transferable[i] = this.isTransferable(tokenIds[i]);
if (compIds.length > 0)
{
firstCompIds[i] = compIds[0];
}
}
return (tokenIds, attribs, firstCompIds, transferable);
}

/**
* @dev Get attributes and Component Ids (i.e. PowerStones) CryptoBeastie
* @param _tokenId uint256 for the given token
*/
function getProperties(uint256 _tokenId) external view returns (uint256 attrs, uint256[] compIds) {
return cbStorage.getAttributes(_tokenId);
}

/**
* @dev attributes and Component Ids (i.e. PowerStones) CryptoBeastie
* @param _tokenId uint256 for the given token
* @param _attributes Cryptobeasties attributes
* @param _componentIds Array of Cryptobeasties componentIds (i.e. PowerStones)
*/
function updateAttributes(uint256 _tokenId, uint256 _attributes, uint256[] _componentIds) external {
require(ownerOf(_tokenId) == msg.sender || owner == msg.sender || isController(msg.sender)); //, "token owner"
cbStorage.updateAttributes(_tokenId, _attributes, _componentIds);
}

/**
* @dev Update the reference to the CryptoBeasties storage contract
* @param _storage address for CryptoBeasties storage contract
*/
function updateStorage(address _storage) external  onlyOwnerOrController {
cbStorage = IEntityStorage(_storage);
}

/**
* @dev List all of the CryptoBeasties token Ids held in the Storage Contract
*/
function listTokens() external view returns (uint256[] tokens) {
return cbStorage.list();
}

/**
* @dev Update the URI prefix
* @param _uriPrefix string for url prefix
*/
function setURI(string _uriPrefix) external onlyOwnerOrController {
uriPrefix = _uriPrefix;
}

/**
* @dev Bulk setup of token Ids that can be transferred
* @param _tokenIds array of token Ids that will be set for transfer
*/
function bulkTransferable(uint256[] _tokenIds) external {
address _owner = ownerOf(_tokenIds[0]);
require(_owner == msg.sender || owner == msg.sender || isController(msg.sender)); //, "token owner"
for (uint256 index = 0; index < _tokenIds.length; index++) {
if (_owner == msg.sender) {
require(ownerOf(_tokenIds[index]) == _owner); //, "token owner"
}
transferableTokens.push(_tokenIds[index]);
// save index as +1 to avoid Solidity's zero default mapping value
transferableIndexes[_tokenIds[index]] = transferableTokens.length;
}
}

/**
* @dev Set a Token Id that can be transfer
* @param _tokenId Token Id that will be set for transfer
*/
function setTransferable(uint256 _tokenId) external {
require(ownerOf(_tokenId) == msg.sender || owner == msg.sender || isController(msg.sender)); //, "token owner"
transferableTokens.push(_tokenId);
// save index as +1 to avoid Solidity's zero default mapping value
transferableIndexes[_tokenId] = transferableTokens.length;
}

/**
* @dev Bulk remove transferability of token Ids
* @param _tokenIds array of token Ids that will be removed for transfer
*/
function bulkRemoveTransferable(uint256[] _tokenIds) external {
address _owner = ownerOf(_tokenIds[0]);
require(_owner == msg.sender || owner == msg.sender || isController(msg.sender)); //, "token owner"
for (uint256 index = 0; index < _tokenIds.length; index++) {
if (_owner == msg.sender) {
require(ownerOf(_tokenIds[index]) == _owner); //, "token owner"
}
_removeTransfer(_tokenIds[index]);
}
}

/**
* @dev A token Id that will be removed from transfer
* @param _tokenId Token Id that will be removed for transfer
*/
function removeTransferable(uint256 _tokenId) external {
require(ownerOf(_tokenId) == msg.sender || owner == msg.sender || isController(msg.sender)); //, "token owner"
_removeTransfer(_tokenId);
}

/**
* @dev Internal function to remove transferability of a token Id
* @param _tokenId Token Id that will be removed for Transfer
*/
function _removeTransfer(uint256 _tokenId) internal {
uint lastTokenIndex = transferableTokens.length;
require(lastTokenIndex > 0);
// reduce the index by 1 to make it zero-based
uint256 tokenIndex = transferableIndexes[_tokenId].sub(1);

// reorg transferableTokens array
lastTokenIndex--;
uint256 lastTokenId = transferableTokens[lastTokenIndex];

// reposition the last item
transferableTokens[tokenIndex] = lastTokenId;
transferableIndexes[lastTokenId] = tokenIndex.add(1);

// clear out the last item slot
transferableTokens[lastTokenIndex] = 0;
transferableTokens.length--;
}

/**
* @dev Support merging multiple tokens into one, to increase XP and level-up the target.
* @param _mergeTokenIds Array of tokens to be removed and merged into the target
* @param _targetTokenId The token whose attributes will be improved by the merge
* @param _targetAttributes The new improved attributes for the target token
*/
function mergeTokens(uint256[] _mergeTokenIds, uint256 _targetTokenId, uint256 _targetAttributes) external {
address _owner = ownerOf(_targetTokenId);
require(_owner == msg.sender || owner == msg.sender || isController(msg.sender)); //, "token owner"
require(_mergeTokenIds.length > 0); //, "mergeTokens"
require(!isTransferable(_targetTokenId)); // cannot target a token that is up for sale

// remove merge material tokens
for (uint256 index = 0; index < _mergeTokenIds.length; index++) {
require(ownerOf(_mergeTokenIds[index]) == _owner); //, "array"
_burn(_owner, _mergeTokenIds[index]);
}

// update target token
uint256 attribs;
uint256[] memory compIds;
(attribs, compIds) = cbStorage.getAttributes(_targetTokenId);
cbStorage.updateAttributes(_targetTokenId, _targetAttributes, compIds);
}
}

contract OwnableDelegateProxy { }

contract ProxyRegistry {
mapping(address => OwnableDelegateProxy) public proxies;
}```

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