{ "contractName": "AddressHelper", "abi": [ { "constant": true, "inputs": [ { "name": "data", "type": "address" } ], "name": "addressToString", "outputs": [ { "name": "", "type": "string" } ], "payable": false, "stateMutability": "pure", "type": "function" }, { "constant": true, "inputs": [ { "name": "s", "type": "string" } ], "name": "stringToAddress", "outputs": [ { "name": "", "type": "address" } ], "payable": false, "stateMutability": "pure", "type": "function" }, { "constant": true, "inputs": [ { "name": "c", "type": "uint256" } ], "name": "fromHexChar", "outputs": [ { "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "pure", "type": "function" } ], "metadata": 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"source": "pragma solidity ^0.5.2;\n\ncontract AddressHelper {\n function addressToString (address data) public pure returns (string memory) {\n bytes memory s = new bytes(42);\n s[0] = \"0\";\n s[1] = \"x\";\n for (uint i = 0; i < 20; i++) {\n byte b = byte(uint8(uint(data) / (2**(8*(19 - i)))));\n byte hi = byte(uint8(b) / 16);\n byte lo = byte(uint8(b) - 16 * uint8(hi));\n s[2*i + 2] = char(hi);\n s[2*i + 3] = char(lo);\n }\n return string(s);\n }\n\n function char (byte b) internal pure returns (byte c) {\n if (b < 0x0A) return byte(uint8(b) + 0x30);\n else return byte(uint8(b) + 0x57);\n }\n\n // source: https://github.com/riflabs/RIF-Token/blob/master/contracts/util/AddressHelper.sol\n function stringToAddress(string memory s) public pure returns(address) {\n bytes memory ss = bytes(s);\n\n // it should have 40 or 42 characters\n if (ss.length != 40 && ss.length != 42) revert();\n\n uint r = 0;\n uint offset = 0;\n\n if (ss.length == 42) {\n offset = 2;\n\n if (ss[0] != byte('0')) revert();\n if (ss[1] != byte('x') && ss[1] != byte('X')) revert();\n }\n\n uint i;\n uint x;\n uint v;\n\n // loads first 32 bytes from array,\n // skipping array length (32 bytes to skip)\n // offset == 0x20\n assembly { v := mload(add(0x20, ss)) }\n\n // converts the first 32 bytes, adding to result\n for (i = offset; i < 32; ++i) {\n assembly { x := byte(i, v) }\n r = r * 16 + fromHexChar(x);\n }\n\n // loads second 32 bytes from array,\n // skipping array length (32 bytes to skip)\n // and first 32 bytes\n // offset == 0x40\n assembly { v := mload(add(0x40, ss)) }\n\n // converts the last 8 bytes, adding to result\n for (i = 0; i < 8 + offset; ++i) {\n assembly { x := byte(i, v) }\n r = r * 16 + fromHexChar(x);\n }\n\n return address(r);\n }\n\n function fromHexChar(uint c) public pure returns (uint) {\n if (c >= 0x30 && c <= 0x39) {\n return c - 0x30;\n }\n\n if (c >= 0x61 && c <= 0x66) {\n return 10 + c - 0x61;\n }\n\n if (c >= 0x41 && c <= 0x46) {\n return 10 + c - 0x41;\n }\n\n // Reaching this point means the ordinal is not for a hex char.\n revert();\n }\n}", "sourcePath": "/Users/ilanolkies/code/rnsdomains/rns-artifacts/contracts/util/AddressHelper.sol", "ast": { "absolutePath": "/Users/ilanolkies/code/rnsdomains/rns-artifacts/contracts/util/AddressHelper.sol", "exportedSymbols": { "AddressHelper": [ 1777 ] }, "id": 1778, "nodeType": "SourceUnit", "nodes": [ { "id": 1444, "literals": [ "solidity", "^", "0.5", ".2" ], "nodeType": "PragmaDirective", "src": "0:23:13" }, { "baseContracts": [], "contractDependencies": [], "contractKind": "contract", "documentation": null, "fullyImplemented": true, "id": 1777, "linearizedBaseContracts": [ 1777 ], "name": "AddressHelper", "nodeType": "ContractDefinition", "nodes": [ { "body": { "id": 1555, "nodeType": "Block", "src": "130:397:13", "statements": [ { "assignments": [ 1452 ], "declarations": [ { "constant": false, "id": 1452, "name": "s", "nodeType": "VariableDeclaration", "scope": 1555, "src": "140:14:13", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 1451, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "140:5:13", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "id": 1457, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "3432", "id": 1455, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "167:2:13", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_42_by_1", "typeString": "int_const 42" }, "value": "42" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_42_by_1", "typeString": "int_const 42" } ], "id": 1454, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "NewExpression", "src": "157:9:13", "typeDescriptions": { "typeIdentifier": "t_function_objectcreation_pure$_t_uint256_$returns$_t_bytes_memory_$", "typeString": "function (uint256) pure returns (bytes memory)" }, "typeName": { "id": 1453, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "161:5:13", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } } }, "id": 1456, "isConstant": false, "isLValue": false, "isPure": true, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "157:13:13", "typeDescriptions": { "typeIdentifier": "t_bytes_memory", "typeString": "bytes memory" } }, "nodeType": "VariableDeclarationStatement", "src": "140:30:13" }, { "expression": { "argumentTypes": null, "id": 1462, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 1458, "name": "s", 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