jcc-solidity-utils
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jcc solidity utils
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{
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"source": "pragma solidity >=0.4.24;\n\n/**\n * @dev Utility library of inline functions on addresses.\n */\nlibrary AddressUtils {\n /**\n * @dev Returns whether the target address is a contract.\n * @param _addr Address to check.\n */\n function isContract(address _addr) internal view returns (bool) {\n uint256 size;\n\n /**\n * XXX Currently there is no better way to check if there is a contract in an address than to\n * check the size of the code at that address.\n * See https://ethereum.stackexchange.com/a/14016/36603 for more details about how this works.\n * TODO: Check this again before the Serenity release, because all addresses will be\n * contracts then.\n */\n assembly {\n size := extcodesize(_addr)\n } // solium-disable-line security/no-inline-assembly\n return size > 0;\n }\n\n function isZeroAddress(address _addr) internal pure returns (bool) {\n return _addr == address(0);\n }\n\n // 使用toString，因为js重载导致无法正常执行\n function getString(address _addr) internal pure returns (string memory) {\n bytes32 value = bytes32(uint256(_addr));\n bytes memory alphabet = \"0123456789abcdef\";\n\n bytes memory str = new bytes(42);\n str[0] = \"0\";\n str[1] = \"x\";\n for (uint256 i = 0; i < 20; i++) {\n str[2 + i * 2] = alphabet[uint256(uint8(value[i + 12] >> 4))];\n str[3 + i * 2] = alphabet[uint256(uint8(value[i + 12] & 0x0f))];\n }\n\n return string(str);\n }\n\n function fromString(address _addr, string memory _str)\n internal\n pure\n returns (address)\n {\n bytes memory b = bytes(_str);\n\n uint256 result = 0;\n for (uint256 i = 0; i < b.length; i++) {\n uint256 c = uint256(uint8(b[i]));\n if (c >= 48 && c <= 57) {\n result = result * 16 + (c - 48);\n }\n if (c >= 65 && c <= 90) {\n result = result * 16 + (c - 55);\n }\n if (c >= 97 && c <= 122) {\n result = result * 16 + (c - 87);\n }\n }\n\n return address(result);\n }\n}\n",
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