Contract 0x0000000000000000000000000000000000001001

/**
 *Submitted for verification at BscScan.com on 2020-09-02
*/

// File: contracts/interface/ISystemReward.sol

pragma solidity 0.6.4;

interface ISystemReward {
  function claimRewards(address payable to, uint256 amount) external returns(uint256 actualAmount);
}

// File: contracts/interface/IRelayerHub.sol

pragma solidity 0.6.4;

interface IRelayerHub {
  function isRelayer(address sender) external view returns (bool);
}

// File: contracts/interface/ILightClient.sol

pragma solidity 0.6.4;

interface ILightClient {

  function isHeaderSynced(uint64 height) external view returns (bool);

  function getAppHash(uint64 height) external view returns (bytes32);

  function getSubmitter(uint64 height) external view returns (address payable);

}

// File: contracts/System.sol

pragma solidity 0.6.4;




contract System {

  bool public alreadyInit;

  uint32 public constant CODE_OK = 0;
  uint32 public constant ERROR_FAIL_DECODE = 100;

  uint8 constant public BIND_CHANNELID = 0x01;
  uint8 constant public TRANSFER_IN_CHANNELID = 0x02;
  uint8 constant public TRANSFER_OUT_CHANNELID = 0x03;
  uint8 constant public STAKING_CHANNELID = 0x08;
  uint8 constant public GOV_CHANNELID = 0x09;
  uint8 constant public SLASH_CHANNELID = 0x0b;
  uint16 constant public bscChainID = 0x0038;

  address public constant VALIDATOR_CONTRACT_ADDR = 0x0000000000000000000000000000000000001000;
  address public constant SLASH_CONTRACT_ADDR = 0x0000000000000000000000000000000000001001;
  address public constant SYSTEM_REWARD_ADDR = 0x0000000000000000000000000000000000001002;
  address public constant LIGHT_CLIENT_ADDR = 0x0000000000000000000000000000000000001003;
  address public constant TOKEN_HUB_ADDR = 0x0000000000000000000000000000000000001004;
  address public constant INCENTIVIZE_ADDR=0x0000000000000000000000000000000000001005;
  address public constant RELAYERHUB_CONTRACT_ADDR = 0x0000000000000000000000000000000000001006;
  address public constant GOV_HUB_ADDR = 0x0000000000000000000000000000000000001007;
  address public constant TOKEN_MANAGER_ADDR = 0x0000000000000000000000000000000000001008;
  address public constant CROSS_CHAIN_CONTRACT_ADDR = 0x0000000000000000000000000000000000002000;


  modifier onlyCoinbase() {
    require(msg.sender == block.coinbase, "the message sender must be the block producer");
    _;
  }

  modifier onlyNotInit() {
    require(!alreadyInit, "the contract already init");
    _;
  }

  modifier onlyInit() {
    require(alreadyInit, "the contract not init yet");
    _;
  }

  modifier onlySlash() {
    require(msg.sender == SLASH_CONTRACT_ADDR, "the message sender must be slash contract");
    _;
  }

  modifier onlyTokenHub() {
    require(msg.sender == TOKEN_HUB_ADDR, "the message sender must be token hub contract");
    _;
  }

  modifier onlyGov() {
    require(msg.sender == GOV_HUB_ADDR, "the message sender must be governance contract");
    _;
  }

  modifier onlyValidatorContract() {
    require(msg.sender == VALIDATOR_CONTRACT_ADDR, "the message sender must be validatorSet contract");
    _;
  }

  modifier onlyCrossChainContract() {
    require(msg.sender == CROSS_CHAIN_CONTRACT_ADDR, "the message sender must be cross chain contract");
    _;
  }

  modifier onlyRelayerIncentivize() {
    require(msg.sender == INCENTIVIZE_ADDR, "the message sender must be incentivize contract");
    _;
  }

  modifier onlyRelayer() {
    require(IRelayerHub(RELAYERHUB_CONTRACT_ADDR).isRelayer(msg.sender), "the msg sender is not a relayer");
    _;
  }

  modifier onlyTokenManager() {
    require(msg.sender == TOKEN_MANAGER_ADDR, "the msg sender must be tokenManager");
    _;
  }

  // Not reliable, do not use when need strong verify
  function isContract(address addr) internal view returns (bool) {
    uint size;
    assembly { size := extcodesize(addr) }
    return size > 0;
  }
}

// File: contracts/lib/BytesToTypes.sol

pragma solidity 0.6.4;

/**
 * @title BytesToTypes
 * Copyright (c) 2016-2020 zpouladzade/Seriality
 * @dev The BytesToTypes contract converts the memory byte arrays to the standard solidity types
 * @author [email protected]
 */

library BytesToTypes {


    function bytesToAddress(uint _offst, bytes memory _input) internal pure returns (address _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToBool(uint _offst, bytes memory _input) internal pure returns (bool _output) {

        uint8 x;
        assembly {
            x := mload(add(_input, _offst))
        }
        x==0 ? _output = false : _output = true;
    }

    function getStringSize(uint _offst, bytes memory _input) internal pure returns(uint size) {

        assembly{

            size := mload(add(_input,_offst))
            let chunk_count := add(div(size,32),1) // chunk_count = size/32 + 1

            if gt(mod(size,32),0) {// if size%32 > 0
                chunk_count := add(chunk_count,1)
            }

             size := mul(chunk_count,32)// first 32 bytes reseves for size in strings
        }
    }

    function bytesToString(uint _offst, bytes memory _input, bytes memory _output) internal pure {

        uint size = 32;
        assembly {

            let chunk_count

            size := mload(add(_input,_offst))
            chunk_count := add(div(size,32),1) // chunk_count = size/32 + 1

            if gt(mod(size,32),0) {
                chunk_count := add(chunk_count,1)  // chunk_count++
            }

            for { let index:= 0 }  lt(index , chunk_count) { index := add(index,1) } {
                mstore(add(_output,mul(index,32)),mload(add(_input,_offst)))
                _offst := sub(_offst,32)           // _offst -= 32
            }
        }
    }

    function bytesToBytes32(uint _offst, bytes memory  _input, bytes32 _output) internal pure {

        assembly {
            mstore(_output , add(_input, _offst))
            mstore(add(_output,32) , add(add(_input, _offst),32))
        }
    }

    function bytesToInt8(uint _offst, bytes memory  _input) internal pure returns (int8 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt16(uint _offst, bytes memory _input) internal pure returns (int16 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt24(uint _offst, bytes memory _input) internal pure returns (int24 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt32(uint _offst, bytes memory _input) internal pure returns (int32 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt40(uint _offst, bytes memory _input) internal pure returns (int40 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt48(uint _offst, bytes memory _input) internal pure returns (int48 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt56(uint _offst, bytes memory _input) internal pure returns (int56 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt64(uint _offst, bytes memory _input) internal pure returns (int64 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt72(uint _offst, bytes memory _input) internal pure returns (int72 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt80(uint _offst, bytes memory _input) internal pure returns (int80 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt88(uint _offst, bytes memory _input) internal pure returns (int88 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt96(uint _offst, bytes memory _input) internal pure returns (int96 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

        function bytesToInt104(uint _offst, bytes memory _input) internal pure returns (int104 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt112(uint _offst, bytes memory _input) internal pure returns (int112 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt120(uint _offst, bytes memory _input) internal pure returns (int120 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt128(uint _offst, bytes memory _input) internal pure returns (int128 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt136(uint _offst, bytes memory _input) internal pure returns (int136 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt144(uint _offst, bytes memory _input) internal pure returns (int144 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt152(uint _offst, bytes memory _input) internal pure returns (int152 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt160(uint _offst, bytes memory _input) internal pure returns (int160 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt168(uint _offst, bytes memory _input) internal pure returns (int168 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt176(uint _offst, bytes memory _input) internal pure returns (int176 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt184(uint _offst, bytes memory _input) internal pure returns (int184 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt192(uint _offst, bytes memory _input) internal pure returns (int192 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt200(uint _offst, bytes memory _input) internal pure returns (int200 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt208(uint _offst, bytes memory _input) internal pure returns (int208 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt216(uint _offst, bytes memory _input) internal pure returns (int216 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt224(uint _offst, bytes memory _input) internal pure returns (int224 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt232(uint _offst, bytes memory _input) internal pure returns (int232 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt240(uint _offst, bytes memory _input) internal pure returns (int240 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt248(uint _offst, bytes memory _input) internal pure returns (int248 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToInt256(uint _offst, bytes memory _input) internal pure returns (int256 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

        function bytesToUint8(uint _offst, bytes memory _input) internal pure returns (uint8 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

        function bytesToUint16(uint _offst, bytes memory _input) internal pure returns (uint16 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

        function bytesToUint24(uint _offst, bytes memory _input) internal pure returns (uint24 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

        function bytesToUint32(uint _offst, bytes memory _input) internal pure returns (uint32 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

        function bytesToUint40(uint _offst, bytes memory _input) internal pure returns (uint40 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

        function bytesToUint48(uint _offst, bytes memory _input) internal pure returns (uint48 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

        function bytesToUint56(uint _offst, bytes memory _input) internal pure returns (uint56 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

        function bytesToUint64(uint _offst, bytes memory _input) internal pure returns (uint64 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

        function bytesToUint72(uint _offst, bytes memory _input) internal pure returns (uint72 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

        function bytesToUint80(uint _offst, bytes memory _input) internal pure returns (uint80 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

        function bytesToUint88(uint _offst, bytes memory _input) internal pure returns (uint88 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

        function bytesToUint96(uint _offst, bytes memory _input) internal pure returns (uint96 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

        function bytesToUint104(uint _offst, bytes memory _input) internal pure returns (uint104 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint112(uint _offst, bytes memory _input) internal pure returns (uint112 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint120(uint _offst, bytes memory _input) internal pure returns (uint120 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint128(uint _offst, bytes memory _input) internal pure returns (uint128 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint136(uint _offst, bytes memory _input) internal pure returns (uint136 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint144(uint _offst, bytes memory _input) internal pure returns (uint144 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint152(uint _offst, bytes memory _input) internal pure returns (uint152 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint160(uint _offst, bytes memory _input) internal pure returns (uint160 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint168(uint _offst, bytes memory _input) internal pure returns (uint168 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint176(uint _offst, bytes memory _input) internal pure returns (uint176 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint184(uint _offst, bytes memory _input) internal pure returns (uint184 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint192(uint _offst, bytes memory _input) internal pure returns (uint192 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint200(uint _offst, bytes memory _input) internal pure returns (uint200 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint208(uint _offst, bytes memory _input) internal pure returns (uint208 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint216(uint _offst, bytes memory _input) internal pure returns (uint216 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint224(uint _offst, bytes memory _input) internal pure returns (uint224 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint232(uint _offst, bytes memory _input) internal pure returns (uint232 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint240(uint _offst, bytes memory _input) internal pure returns (uint240 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint248(uint _offst, bytes memory _input) internal pure returns (uint248 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

    function bytesToUint256(uint _offst, bytes memory _input) internal pure returns (uint256 _output) {

        assembly {
            _output := mload(add(_input, _offst))
        }
    }

}

// File: contracts/lib/Memory.sol

pragma solidity 0.6.4;

library Memory {

    // Size of a word, in bytes.
    uint internal constant WORD_SIZE = 32;
    // Size of the header of a 'bytes' array.
    uint internal constant BYTES_HEADER_SIZE = 32;
    // Address of the free memory pointer.
    uint internal constant FREE_MEM_PTR = 0x40;

    // Compares the 'len' bytes starting at address 'addr' in memory with the 'len'
    // bytes starting at 'addr2'.
    // Returns 'true' if the bytes are the same, otherwise 'false'.
    function equals(uint addr, uint addr2, uint len) internal pure returns (bool equal) {
        assembly {
            equal := eq(keccak256(addr, len), keccak256(addr2, len))
        }
    }

    // Compares the 'len' bytes starting at address 'addr' in memory with the bytes stored in
    // 'bts'. It is allowed to set 'len' to a lower value then 'bts.length', in which case only
    // the first 'len' bytes will be compared.
    // Requires that 'bts.length >= len'
    function equals(uint addr, uint len, bytes memory bts) internal pure returns (bool equal) {
        require(bts.length >= len);
        uint addr2;
        assembly {
            addr2 := add(bts, /*BYTES_HEADER_SIZE*/32)
        }
        return equals(addr, addr2, len);
    }

    function compareStrings(string memory a, string memory b) internal pure returns (bool) {
        return (keccak256(abi.encodePacked((a))) == keccak256(abi.encodePacked((b))));
    }

    // Copy 'len' bytes from memory address 'src', to address 'dest'.
    // This function does not check the or destination, it only copies
    // the bytes.
    function copy(uint src, uint dest, uint len) internal pure {
        // Copy word-length chunks while possible
        for (; len >= WORD_SIZE; len -= WORD_SIZE) {
            assembly {
                mstore(dest, mload(src))
            }
            dest += WORD_SIZE;
            src += WORD_SIZE;
        }

        // Copy remaining bytes
        uint mask = 256 ** (WORD_SIZE - len) - 1;
        assembly {
            let srcpart := and(mload(src), not(mask))
            let destpart := and(mload(dest), mask)
            mstore(dest, or(destpart, srcpart))
        }
    }

    // Returns a memory pointer to the provided bytes array.
    function ptr(bytes memory bts) internal pure returns (uint addr) {
        assembly {
            addr := bts
        }
    }

    // Returns a memory pointer to the data portion of the provided bytes array.
    function dataPtr(bytes memory bts) internal pure returns (uint addr) {
        assembly {
            addr := add(bts, /*BYTES_HEADER_SIZE*/32)
        }
    }

    // This function does the same as 'dataPtr(bytes memory)', but will also return the
    // length of the provided bytes array.
    function fromBytes(bytes memory bts) internal pure returns (uint addr, uint len) {
        len = bts.length;
        assembly {
            addr := add(bts, /*BYTES_HEADER_SIZE*/32)
        }
    }

    // Creates a 'bytes memory' variable from the memory address 'addr', with the
    // length 'len'. The function will allocate new memory for the bytes array, and
    // the 'len bytes starting at 'addr' will be copied into that new memory.
    function toBytes(uint addr, uint len) internal pure returns (bytes memory bts) {
        bts = new bytes(len);
        uint btsptr;
        assembly {
            btsptr := add(bts, /*BYTES_HEADER_SIZE*/32)
        }
        copy(addr, btsptr, len);
    }

    // Get the word stored at memory address 'addr' as a 'uint'.
    function toUint(uint addr) internal pure returns (uint n) {
        assembly {
            n := mload(addr)
        }
    }

    // Get the word stored at memory address 'addr' as a 'bytes32'.
    function toBytes32(uint addr) internal pure returns (bytes32 bts) {
        assembly {
            bts := mload(addr)
        }
    }
}

// File: contracts/interface/ISlashIndicator.sol

pragma solidity 0.6.4;

interface ISlashIndicator {
  function clean() external;
}

// File: contracts/interface/IApplication.sol

pragma solidity 0.6.4;

interface IApplication {
    /**
     * @dev Handle syn package
     */
    function handleSynPackage(uint8 channelId, bytes calldata msgBytes) external returns(bytes memory responsePayload);

    /**
     * @dev Handle ack package
     */
    function handleAckPackage(uint8 channelId, bytes calldata msgBytes) external;

    /**
     * @dev Handle fail ack package
     */
    function handleFailAckPackage(uint8 channelId, bytes calldata msgBytes) external;
}

// File: contracts/interface/IBSCValidatorSet.sol

pragma solidity 0.6.4;

interface IBSCValidatorSet {
  function misdemeanor(address validator) external;
  function felony(address validator)external;
}

// File: contracts/interface/IParamSubscriber.sol

pragma solidity 0.6.4;

interface IParamSubscriber {
    function updateParam(string calldata key, bytes calldata value) external;
}

// File: contracts/interface/ICrossChain.sol

pragma solidity 0.6.4;

interface ICrossChain {
    /**
     * @dev Send package to Binance Chain
     */
    function sendSynPackage(uint8 channelId, bytes calldata msgBytes, uint256 relayFee) external;
}

// File: contracts/lib/RLPEncode.sol

pragma solidity 0.6.4;

library RLPEncode {

    uint8 constant STRING_OFFSET = 0x80;
    uint8 constant LIST_OFFSET = 0xc0;

    /**
     * @notice Encode string item
     * @param self The string (ie. byte array) item to encode
     * @return The RLP encoded string in bytes
     */
    function encodeBytes(bytes memory self) internal pure returns (bytes memory) {
        if (self.length == 1 && self[0] <= 0x7f) {
            return self;
        }
        return mergeBytes(encodeLength(self.length, STRING_OFFSET), self);
    }

    /**
     * @notice Encode address
     * @param self The address to encode
     * @return The RLP encoded address in bytes
     */
    function encodeAddress(address self) internal pure returns (bytes memory) {
        bytes memory b;
        assembly {
            let m := mload(0x40)
            mstore(add(m, 20), xor(0x140000000000000000000000000000000000000000, self))
            mstore(0x40, add(m, 52))
            b := m
        }
        return encodeBytes(b);
    }

    /**
     * @notice Encode uint
     * @param self The uint to encode
     * @return The RLP encoded uint in bytes
     */
    function encodeUint(uint self) internal pure returns (bytes memory) {
        return encodeBytes(toBinary(self));
    }

    /**
     * @notice Encode int
     * @param self The int to encode
     * @return The RLP encoded int in bytes
     */
    function encodeInt(int self) internal pure returns (bytes memory) {
        return encodeUint(uint(self));
    }

    /**
     * @notice Encode bool
     * @param self The bool to encode
     * @return The RLP encoded bool in bytes
     */
    function encodeBool(bool self) internal pure returns (bytes memory) {
        bytes memory rs = new bytes(1);
        if (self) {
            rs[0] = bytes1(uint8(1));
        }
        return rs;
    }

    /**
     * @notice Encode list of items
     * @param self The list of items to encode, each item in list must be already encoded
     * @return The RLP encoded list of items in bytes
     */
    function encodeList(bytes[] memory self) internal pure returns (bytes memory) {
        if (self.length == 0) {
            return new bytes(0);
        }
        bytes memory payload = self[0];
        for (uint i = 1; i < self.length; i++) {
            payload = mergeBytes(payload, self[i]);
        }
        return mergeBytes(encodeLength(payload.length, LIST_OFFSET), payload);
    }

    /**
     * @notice Concat two bytes arrays
     * @param _preBytes The first bytes array
     * @param _postBytes The second bytes array
     * @return The merged bytes array
     */
    function mergeBytes(
        bytes memory _preBytes,
        bytes memory _postBytes
    )
    internal
    pure
    returns (bytes memory)
    {
        bytes memory tempBytes;

        assembly {
        // Get a location of some free memory and store it in tempBytes as
        // Solidity does for memory variables.
            tempBytes := mload(0x40)

        // Store the length of the first bytes array at the beginning of
        // the memory for tempBytes.
            let length := mload(_preBytes)
            mstore(tempBytes, length)

        // Maintain a memory counter for the current write location in the
        // temp bytes array by adding the 32 bytes for the array length to
        // the starting location.
            let mc := add(tempBytes, 0x20)
        // Stop copying when the memory counter reaches the length of the
        // first bytes array.
            let end := add(mc, length)

            for {
            // Initialize a copy counter to the start of the _preBytes data,
            // 32 bytes into its memory.
                let cc := add(_preBytes, 0x20)
            } lt(mc, end) {
            // Increase both counters by 32 bytes each iteration.
                mc := add(mc, 0x20)
                cc := add(cc, 0x20)
            } {
            // Write the _preBytes data into the tempBytes memory 32 bytes
            // at a time.
                mstore(mc, mload(cc))
            }

        // Add the length of _postBytes to the current length of tempBytes
        // and store it as the new length in the first 32 bytes of the
        // tempBytes memory.
            length := mload(_postBytes)
            mstore(tempBytes, add(length, mload(tempBytes)))

        // Move the memory counter back from a multiple of 0x20 to the
        // actual end of the _preBytes data.
            mc := end
        // Stop copying when the memory counter reaches the new combined
        // length of the arrays.
            end := add(mc, length)

            for {
                let cc := add(_postBytes, 0x20)
            } lt(mc, end) {
                mc := add(mc, 0x20)
                cc := add(cc, 0x20)
            } {
                mstore(mc, mload(cc))
            }

        // Update the free-memory pointer by padding our last write location
        // to 32 bytes: add 31 bytes to the end of tempBytes to move to the
        // next 32 byte block, then round down to the nearest multiple of
        // 32. If the sum of the length of the two arrays is zero then add
        // one before rounding down to leave a blank 32 bytes (the length block with 0).
            mstore(0x40, and(
            add(add(end, iszero(add(length, mload(_preBytes)))), 31),
            not(31) // Round down to the nearest 32 bytes.
            ))
        }

        return tempBytes;
    }

    /**
     * @notice Encode the first byte, followed by the `length` in binary form if `length` is more than 55.
     * @param length The length of the string or the payload
     * @param offset `STRING_OFFSET` if item is string, `LIST_OFFSET` if item is list
     * @return RLP encoded bytes
     */
    function encodeLength(uint length, uint offset) internal pure returns (bytes memory) {
        require(length < 256**8, "input too long");
        bytes memory rs = new bytes(1);
        if (length <= 55) {
            rs[0] = byte(uint8(length + offset));
            return rs;
        }
        bytes memory bl = toBinary(length);
        rs[0] = byte(uint8(bl.length + offset + 55));
        return mergeBytes(rs, bl);
    }

    /**
     * @notice Encode integer in big endian binary form with no leading zeroes
     * @param x The integer to encode
     * @return RLP encoded bytes
     */
    function toBinary(uint x) internal pure returns (bytes memory) {
        bytes memory b = new bytes(32);
        assembly {
            mstore(add(b, 32), x)
        }
        uint i;
        if (x & 0xffffffffffffffffffffffffffffffffffffffffffffffff0000000000000000 == 0) {
            i = 24;
        } else if (x & 0xffffffffffffffffffffffffffffffff00000000000000000000000000000000 == 0) {
            i = 16;
        } else {
            i = 0;
        }
        for (; i < 32; i++) {
            if (b[i] != 0) {
                break;
            }
        }
        uint length = 32 - i;
        bytes memory rs = new bytes(length);
        assembly {
            mstore(add(rs, length), x)
            mstore(rs, length)
        }
        return rs;
    }
}

// File: contracts/lib/RLPDecode.sol

pragma solidity 0.6.4;

library RLPDecode {
    uint8 constant STRING_SHORT_START = 0x80;
    uint8 constant STRING_LONG_START  = 0xb8;
    uint8 constant LIST_SHORT_START   = 0xc0;
    uint8 constant LIST_LONG_START    = 0xf8;

    uint8 constant WORD_SIZE = 32;

    struct RLPItem {
        uint len;
        uint memPtr;
    }

    struct Iterator {
        RLPItem item;   // Item that's being iterated over.
        uint nextPtr;   // Position of the next item in the list.
    }

    function next(Iterator memory self) internal pure returns (RLPItem memory) {
        require(hasNext(self));

        uint ptr = self.nextPtr;
        uint itemLength = _itemLength(ptr);
        self.nextPtr = ptr + itemLength;

        return RLPItem(itemLength, ptr);
    }

    function hasNext(Iterator memory self) internal pure returns (bool) {
        RLPItem memory item = self.item;
        return self.nextPtr < item.memPtr + item.len;
    }

    function toRLPItem(bytes memory self) internal pure returns (RLPItem memory) {
        uint memPtr;
        assembly {
            memPtr := add(self, 0x20)
        }

        return RLPItem(self.length, memPtr);
    }

    function iterator(RLPItem memory self) internal pure returns (Iterator memory) {
        require(isList(self));

        uint ptr = self.memPtr + _payloadOffset(self.memPtr);
        return Iterator(self, ptr);
    }

    function rlpLen(RLPItem memory item) internal pure returns (uint) {
        return item.len;
    }

    function payloadLen(RLPItem memory item) internal pure returns (uint) {
        return item.len - _payloadOffset(item.memPtr);
    }

    function toList(RLPItem memory item) internal pure returns (RLPItem[] memory) {
        require(isList(item));

        uint items = numItems(item);
        RLPItem[] memory result = new RLPItem[](items);

        uint memPtr = item.memPtr + _payloadOffset(item.memPtr);
        uint dataLen;
        for (uint i = 0; i < items; i++) {
            dataLen = _itemLength(memPtr);
            result[i] = RLPItem(dataLen, memPtr);
            memPtr = memPtr + dataLen;
        }

        return result;
    }

    function isList(RLPItem memory item) internal pure returns (bool) {
        if (item.len == 0) return false;

        uint8 byte0;
        uint memPtr = item.memPtr;
        assembly {
            byte0 := byte(0, mload(memPtr))
        }

        if (byte0 < LIST_SHORT_START)
            return false;
        return true;
    }

    function toRlpBytes(RLPItem memory item) internal pure returns (bytes memory) {
        bytes memory result = new bytes(item.len);
        if (result.length == 0) return result;

        uint ptr;
        assembly {
            ptr := add(0x20, result)
        }

        copy(item.memPtr, ptr, item.len);
        return result;
    }

    function toBoolean(RLPItem memory item) internal pure returns (bool) {
        require(item.len == 1);
        uint result;
        uint memPtr = item.memPtr;
        assembly {
            result := byte(0, mload(memPtr))
        }

        return result == 0 ? false : true;
    }

    function toAddress(RLPItem memory item) internal pure returns (address) {
        // 1 byte for the length prefix
        require(item.len == 21);

        return address(toUint(item));
    }

    function toUint(RLPItem memory item) internal pure returns (uint) {
        require(item.len > 0 && item.len <= 33);

        uint offset = _payloadOffset(item.memPtr);
        require(item.len >= offset, "length is less than offset");
        uint len = item.len - offset;

        uint result;
        uint memPtr = item.memPtr + offset;
        assembly {
            result := mload(memPtr)

        // shfit to the correct location if neccesary
            if lt(len, 32) {
                result := div(result, exp(256, sub(32, len)))
            }
        }

        return result;
    }

    // enforces 32 byte length
    function toUintStrict(RLPItem memory item) internal pure returns (uint) {
        // one byte prefix
        require(item.len == 33);

        uint result;
        uint memPtr = item.memPtr + 1;
        assembly {
            result := mload(memPtr)
        }

        return result;
    }

    function toBytes(RLPItem memory item) internal pure returns (bytes memory) {
        require(item.len > 0);

        uint offset = _payloadOffset(item.memPtr);
        uint len = item.len - offset; // data length
        bytes memory result = new bytes(len);

        uint destPtr;
        assembly {
            destPtr := add(0x20, result)
        }

        copy(item.memPtr + offset, destPtr, len);
        return result;
    }

    function numItems(RLPItem memory item) private pure returns (uint) {
        if (item.len == 0) return 0;

        uint count = 0;
        uint currPtr = item.memPtr + _payloadOffset(item.memPtr);
        uint endPtr = item.memPtr + item.len;
        while (currPtr < endPtr) {
            currPtr = currPtr + _itemLength(currPtr); // skip over an item
            count++;
        }

        return count;
    }

    function _itemLength(uint memPtr) private pure returns (uint) {
        uint itemLen;
        uint byte0;
        assembly {
            byte0 := byte(0, mload(memPtr))
        }

        if (byte0 < STRING_SHORT_START)
            itemLen = 1;

        else if (byte0 < STRING_LONG_START)
            itemLen = byte0 - STRING_SHORT_START + 1;

        else if (byte0 < LIST_SHORT_START) {
            uint dataLen;
            assembly {
                let byteLen := sub(byte0, 0xb7) // # of bytes the actual length is
                memPtr := add(memPtr, 1) // skip over the first byte

                /* 32 byte word size */
                dataLen := div(mload(memPtr), exp(256, sub(32, byteLen))) // right shifting to get the len
                itemLen := add(dataLen, add(byteLen, 1))
            }
            require(itemLen >= dataLen, "addition overflow");
        }

        else if (byte0 < LIST_LONG_START) {
            itemLen = byte0 - LIST_SHORT_START + 1;
        }

        else {
            uint dataLen;
            assembly {
                let byteLen := sub(byte0, 0xf7)
                memPtr := add(memPtr, 1)

                dataLen := div(mload(memPtr), exp(256, sub(32, byteLen))) // right shifting to the correct length
                itemLen := add(dataLen, add(byteLen, 1))
            }
            require(itemLen >= dataLen, "addition overflow");
        }

        return itemLen;
    }

    // @return number of bytes until the data
    function _payloadOffset(uint memPtr) private pure returns (uint) {
        uint byte0;
        assembly {
            byte0 := byte(0, mload(memPtr))
        }

        if (byte0 < STRING_SHORT_START)
            return 0;
        else if (byte0 < STRING_LONG_START || (byte0 >= LIST_SHORT_START && byte0 < LIST_LONG_START))
            return 1;
        else if (byte0 < LIST_SHORT_START)  // being explicit
            return byte0 - (STRING_LONG_START - 1) + 1;
        else
            return byte0 - (LIST_LONG_START - 1) + 1;
    }

    /*
    * @param src Pointer to source
    * @param dest Pointer to destination
    * @param len Amount of memory to copy from the source
    */
    function copy(uint src, uint dest, uint len) private pure {
        if (len == 0) return;

        // copy as many word sizes as possible
        for (; len >= WORD_SIZE; len -= WORD_SIZE) {
            assembly {
                mstore(dest, mload(src))
            }

            src += WORD_SIZE;
            dest += WORD_SIZE;
        }

        // left over bytes. Mask is used to remove unwanted bytes from the word
        uint mask = 256 ** (WORD_SIZE - len) - 1;
        assembly {
            let srcpart := and(mload(src), not(mask)) // zero out src
            let destpart := and(mload(dest), mask) // retrieve the bytes
            mstore(dest, or(destpart, srcpart))
        }
    }
}

// File: contracts/lib/CmnPkg.sol

pragma solidity 0.6.4;



library CmnPkg {

    using RLPEncode for *;
    using RLPDecode for *;


    struct CommonAckPackage {
        uint32 code;
    }

    function encodeCommonAckPackage(uint32 code) internal pure returns (bytes memory) {
        bytes[] memory elements = new bytes[](1);
        elements[0] = uint256(code).encodeUint();
        return elements.encodeList();
    }

    function decodeCommonAckPackage(bytes memory msgBytes) internal pure returns (CommonAckPackage memory, bool) {
        CommonAckPackage memory ackPkg;
        RLPDecode.Iterator memory iter = msgBytes.toRLPItem().iterator();

        bool success = false;
        uint256 idx=0;
        while (iter.hasNext()) {
            if (idx == 0) {
                ackPkg.code = uint32(iter.next().toUint());
                success = true;
            } else {
                break;
            }
            idx++;
        }
        return (ackPkg, success);
    }
}

// File: contracts/SlashIndicator.sol

pragma solidity 0.6.4;











contract SlashIndicator is ISlashIndicator,System,IParamSubscriber, IApplication{
  using RLPEncode for *;

  uint256 public constant MISDEMEANOR_THRESHOLD = 50;
  uint256 public constant FELONY_THRESHOLD = 150;
  uint256 public constant BSC_RELAYER_REWARD = 1e16;
  uint256 public constant DECREASE_RATE = 4;

  // State of the contract
  address[] public validators;
  mapping(address => Indicator) public indicators;
  uint256 public previousHeight;
  uint256 public  misdemeanorThreshold;
  uint256 public  felonyThreshold;

  event validatorSlashed(address indexed validator);
  event indicatorCleaned();
  event paramChange(string key, bytes value);

  event knownResponse(uint32 code);
  event unKnownResponse(uint32 code);
  event crashResponse();

  struct Indicator {
    uint256 height;
    uint256 count;
    bool exist;
  }

  modifier oncePerBlock() {
    require(block.number > previousHeight, "can not slash twice in one block");
    _;
    previousHeight = block.number;
  }

  modifier onlyZeroGasPrice() {

    require(tx.gasprice == 0 , "gasprice is not zero");

    _;
  }

  function init() external onlyNotInit{
    misdemeanorThreshold = MISDEMEANOR_THRESHOLD;
    felonyThreshold = FELONY_THRESHOLD;
    alreadyInit = true;
  }

  /*********************** Implement cross chain app ********************************/
  function handleSynPackage(uint8, bytes calldata) external onlyCrossChainContract onlyInit override returns(bytes memory) {
    require(false, "receive unexpected syn package");
  }

  function handleAckPackage(uint8, bytes calldata msgBytes) external onlyCrossChainContract onlyInit override {
    (CmnPkg.CommonAckPackage memory response, bool ok) = CmnPkg.decodeCommonAckPackage(msgBytes);
    if (ok) {
      emit knownResponse(response.code);
    } else {
      emit unKnownResponse(response.code);
    }
    return;
  }

  function handleFailAckPackage(uint8, bytes calldata) external onlyCrossChainContract onlyInit override {
    emit crashResponse();
    return;
  }

  /*********************** External func ********************************/
  function slash(address validator) external onlyCoinbase onlyInit oncePerBlock onlyZeroGasPrice{
    Indicator memory indicator = indicators[validator];
    if (indicator.exist) {
      indicator.count++;
    } else {
      indicator.exist = true;
      indicator.count = 1;
      validators.push(validator);
    }
    indicator.height = block.number;
    if (indicator.count % felonyThreshold == 0) {
      indicator.count = 0;
      IBSCValidatorSet(VALIDATOR_CONTRACT_ADDR).felony(validator);
      ICrossChain(CROSS_CHAIN_CONTRACT_ADDR).sendSynPackage(SLASH_CHANNELID, encodeSlashPackage(validator), 0);
    } else if (indicator.count % misdemeanorThreshold == 0) {
      IBSCValidatorSet(VALIDATOR_CONTRACT_ADDR).misdemeanor(validator);
    }
    indicators[validator] = indicator;
    emit validatorSlashed(validator);
  }


  // To prevent validator misbehaving and leaving, do not clean slash record to zero, but decrease by felonyThreshold/DECREASE_RATE .
  // Clean is an effective implement to reorganize "validators" and "indicators".
  function clean() external override(ISlashIndicator) onlyValidatorContract onlyInit{
    if(validators.length == 0){
      return;
    }
    uint i = 0;
    uint j = validators.length-1;
    for (;i <= j;) {
      bool findLeft = false;
      bool findRight = false;
      for(;i<j;i++){
        Indicator memory leftIndicator = indicators[validators[i]];
        if(leftIndicator.count > felonyThreshold/DECREASE_RATE){
          leftIndicator.count = leftIndicator.count - felonyThreshold/DECREASE_RATE;
          indicators[validators[i]] = leftIndicator;
        }else{
          findLeft = true;
          break;
        }
      }
      for(;i<=j;j--){
        Indicator memory rightIndicator = indicators[validators[j]];
        if(rightIndicator.count > felonyThreshold/DECREASE_RATE){
          rightIndicator.count = rightIndicator.count - felonyThreshold/DECREASE_RATE;
          indicators[validators[j]] = rightIndicator;
          findRight = true;
          break;
        }else{
          delete indicators[validators[j]];
          validators.pop();
        }
        // avoid underflow
        if(j==0){
          break;
        }
      }
      // swap element in array
      if (findLeft && findRight){
        delete indicators[validators[i]];
        validators[i] = validators[j];
        validators.pop();
      }
      // avoid underflow
      if(j==0){
        break;
      }
      // move to next
      i++;
      j--;
    }
    emit indicatorCleaned();
  }


  /*********************** Param update ********************************/
  function updateParam(string calldata key, bytes calldata value) external override onlyInit onlyGov{
    if (Memory.compareStrings(key,"misdemeanorThreshold")) {
      require(value.length == 32, "length of misdemeanorThreshold mismatch");
      uint256 newMisdemeanorThreshold = BytesToTypes.bytesToUint256(32, value);
      require(newMisdemeanorThreshold >= 1 && newMisdemeanorThreshold < felonyThreshold, "the misdemeanorThreshold out of range");
      misdemeanorThreshold = newMisdemeanorThreshold;
    } else if (Memory.compareStrings(key,"felonyThreshold")) {
      require(value.length == 32, "length of felonyThreshold mismatch");
      uint256 newFelonyThreshold = BytesToTypes.bytesToUint256(32, value);
      require(newFelonyThreshold <= 1000 && newFelonyThreshold > misdemeanorThreshold, "the felonyThreshold out of range");
      felonyThreshold = newFelonyThreshold;
    } else {
      require(false, "unknown param");
    }
    emit paramChange(key,value);
  }

  /*********************** query api ********************************/
  function getSlashIndicator(address validator) external view returns (uint256,uint256) {
    Indicator memory indicator = indicators[validator];
    return (indicator.height, indicator.count);
  }

  function encodeSlashPackage(address valAddr) internal view returns (bytes memory) {
    bytes[] memory elements = new bytes[](4);
    elements[0] = valAddr.encodeAddress();
    elements[1] = uint256(block.number).encodeUint();
    elements[2] = uint256(bscChainID).encodeUint();
    elements[3] = uint256(block.timestamp).encodeUint();
    return elements.encodeList();
  }
}

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type":"bytes","name":"msgBytes","internalType":"bytes"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"handleFailAckPackage","inputs":[{"type":"uint8","name":"","internalType":"uint8"},{"type":"bytes","name":"","internalType":"bytes"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"bytes","name":"","internalType":"bytes"}],"name":"handleSynPackage","inputs":[{"type":"uint8","name":"","internalType":"uint8"},{"type":"bytes","name":"","internalType":"bytes"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"height","internalType":"uint256"},{"type":"uint256","name":"count","internalType":"uint256"},{"type":"bool","name":"exist","internalType":"bool"}],"name":"indicators","inputs":[{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"init","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"misdemeanorThreshold","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"previousHeight","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"slash","inputs":[{"type":"address","name":"validator","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"updateParam","inputs":[{"type":"string","name":"key","internalType":"string"},{"type":"bytes","name":"value","internalType":"bytes"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"validators","inputs":[{"type":"uint256","name":"","internalType":"uint256"}]}]

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