133 lines
2.6 KiB
JavaScript
133 lines
2.6 KiB
JavaScript
var _BN = require('bn.js');
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var BN = function BN_extended(n) {
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if (!(this instanceof BN_extended)) {
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return new BN(n);
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}
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arguments[0] = n;
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return _BN.apply(this, arguments);
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};
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module.exports = BN;
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BN.prototype = _BN.prototype;
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var reversebuf = function(buf, nbuf) {
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for (var i = 0; i < buf.length; i++) {
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nbuf[i] = buf[buf.length-1-i];
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}
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};
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BN.prototype.toJSON = function() {
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return this.toString();
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};
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BN.prototype.fromJSON = function(str) {
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var bn = BN(str);
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bn.copy(this);
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return this;
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};
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BN.prototype.fromString = function(str) {
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var bn = BN(str);
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bn.copy(this);
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return this;
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};
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BN.fromBuffer = function(buf, opts) {
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if (typeof opts !== 'undefined' && opts.endian === 'little') {
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var nbuf = new Buffer(buf.length);
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reversebuf(buf, nbuf);
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buf = nbuf;
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}
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var hex = buf.toString('hex');
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if (hex.length % 2)
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hex = "0" + hex;
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var bn = new BN(hex, 16);
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return bn;
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};
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BN.prototype.fromBuffer = function(buf, opts) {
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var bn = BN.fromBuffer(buf, opts);
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bn.copy(this);
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return this;
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};
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BN.prototype.toBuffer = function(opts) {
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var buf;
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if (opts && opts.size) {
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var hex = this.toString(16);
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if (hex.length % 2)
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hex = "0" + hex;
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var natlen = hex.length/2;
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buf = new Buffer(hex, 'hex');
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if (natlen == opts.size)
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buf = buf;
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else if (natlen > opts.size) {
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buf = buf.slice(natlen - buf.length, buf.length);
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}
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else if (natlen < opts.size) {
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var rbuf = new Buffer(opts.size);
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//rbuf.fill(0);
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for (var i = 0; i < buf.length; i++)
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rbuf[rbuf.length-1-i] = buf[buf.length-1-i];
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for (var i = 0; i < opts.size - natlen; i++)
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rbuf[i] = 0;
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buf = rbuf;
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}
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}
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else {
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var hex = this.toString(16);
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if (hex.length % 2)
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hex = "0" + hex;
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buf = new Buffer(hex, 'hex');
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}
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if (typeof opts !== 'undefined' && opts.endian === 'little') {
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var nbuf = new Buffer(buf.length);
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reversebuf(buf, nbuf);
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buf = nbuf;
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}
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return buf;
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};
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function decorate(name) {
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BN.prototype['_' + name] = _BN.prototype[name];
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var f = function(b) {
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if (typeof b === 'string')
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b = new _BN(b);
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else if (typeof b === 'number')
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b = new _BN(b.toString());
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return this['_' + name](b);
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};
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BN.prototype[name] = f;
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};
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_BN.prototype.gt = function(b) {
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return this.cmp(b) > 0;
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};
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_BN.prototype.lt = function(b) {
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return this.cmp(b) < 0;
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};
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decorate('add');
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decorate('sub');
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decorate('mul');
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decorate('mod');
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decorate('div');
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decorate('cmp');
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decorate('gt');
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decorate('lt');
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BN.prototype.toNumber = function() {
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return parseInt(this['toString'](10), 10);
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};
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module.exports = BN;
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