ethereumjs-util
Version:
A collection of utility functions for Ethereum
77 lines • 2.67 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.toType = exports.TypeOutput = exports.bnToRlp = exports.bnToUnpaddedBuffer = exports.bnToHex = void 0;
var externals_1 = require("./externals");
var internal_1 = require("./internal");
var bytes_1 = require("./bytes");
/**
* Convert BN to 0x-prefixed hex string.
*/
function bnToHex(value) {
return "0x".concat(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: ".concat(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)');
}
var output = (0, bytes_1.toBuffer)(input);
if (outputType === TypeOutput.Buffer) {
return output;
}
else if (outputType === TypeOutput.BN) {
return new externals_1.BN(output);
}
else if (outputType === TypeOutput.Number) {
var bn = new externals_1.BN(output);
var max = new externals_1.BN(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".concat(output.toString('hex'));
}
}
exports.toType = toType;
//# sourceMappingURL=types.js.map