ethereumjs-util/dist/types.js

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.toType = exports.TypeOutput = exports.bnToRlp = exports.bnToUnpaddedBuffer = exports.bnToHex = void 0;
const bn_js_1 = __importDefault(require("bn.js"));
const internal_1 = require("./internal");
const bytes_1 = require("./bytes");
/**
 * Convert BN to 0x-prefixed hex string.
 */
function bnToHex(value) {
    return `0x${value.toString(16)}`;
}
exports.bnToHex = bnToHex;
/**
 * Convert value from BN to an unpadded Buffer
 * (useful for RLP transport)
 * @param value value to convert
 */
function bnToUnpaddedBuffer(value) {
    // Using `bn.toArrayLike(Buffer)` instead of `bn.toBuffer()`
    // for compatibility with browserify and similar tools
    return (0, bytes_1.unpadBuffer)(value.toArrayLike(Buffer));
}
exports.bnToUnpaddedBuffer = bnToUnpaddedBuffer;
/**
 * Deprecated alias for {@link bnToUnpaddedBuffer}
 * @deprecated
 */
function bnToRlp(value) {
    return bnToUnpaddedBuffer(value);
}
exports.bnToRlp = bnToRlp;
/**
 * Type output options
 */
var TypeOutput;
(function (TypeOutput) {
    TypeOutput[TypeOutput["Number"] = 0] = "Number";
    TypeOutput[TypeOutput["BN"] = 1] = "BN";
    TypeOutput[TypeOutput["Buffer"] = 2] = "Buffer";
    TypeOutput[TypeOutput["PrefixedHexString"] = 3] = "PrefixedHexString";
})(TypeOutput = exports.TypeOutput || (exports.TypeOutput = {}));
function toType(input, outputType) {
    if (input === null) {
        return null;
    }
    if (input === undefined) {
        return undefined;
    }
    if (typeof input === 'string' && !(0, internal_1.isHexString)(input)) {
        throw new Error(`A string must be provided with a 0x-prefix, given: ${input}`);
    }
    else if (typeof input === 'number' && !Number.isSafeInteger(input)) {
        throw new Error('The provided number is greater than MAX_SAFE_INTEGER (please use an alternative input type)');
    }
    const output = (0, bytes_1.toBuffer)(input);
    if (outputType === TypeOutput.Buffer) {
        return output;
    }
    else if (outputType === TypeOutput.BN) {
        return new bn_js_1.default(output);
    }
    else if (outputType === TypeOutput.Number) {
        const bn = new bn_js_1.default(output);
        const max = new bn_js_1.default(Number.MAX_SAFE_INTEGER.toString());
        if (bn.gt(max)) {
            throw new Error('The provided number is greater than MAX_SAFE_INTEGER (please use an alternative output type)');
        }
        return bn.toNumber();
    }
    else {
        // outputType === TypeOutput.PrefixedHexString
        return `0x${output.toString('hex')}`;
    }
}
exports.toType = toType;
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