@signumjs/contracts/out/getContractDatablock.js

Smart Contracts package for Signum Network

"use strict";
/**
 * Copyright (c) 2019 Burst Apps Team
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.getContractDatablock = getContractDatablock;
const util_1 = require("@signumjs/util");
/**
 * Extracts a variables value as hexadecimal string from a contract's machine data
 *
 * This is a generic function to extract arbitrary data from a contract. It's recommended to use the {@link ContractDataView} class instead
 *
 * @param contract The contract
 * @param position The variables position
 * @param length The length of data to be extracted
 * @return The value as hexadecimal string (already considering endianness)
 *
 */
function getContractDatablock(contract, position, length = 16) {
    const startIndex = position * 16;
    const requiredSize = startIndex + length;
    if (requiredSize > contract.machineData.length) {
        throw new Error(`Insufficient length for variable at position: ${startIndex} (and given length: ${length})`);
    }
    if (requiredSize % 2 !== 0) {
        throw new Error(`Invalid position: ${startIndex} (or given length: ${length}) - must be at least multiple of 2`);
    }
    return (0, util_1.convertHexEndianess)(contract.machineData.substr(startIndex, length));
}
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