120 lines
2.4 KiB
JavaScript
120 lines
2.4 KiB
JavaScript
var bnjs = require('bn.js');
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var _bnjs = bnjs;
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bnjs = function bnjs_extended(n) {
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if (!(this instanceof bnjs_extended)) {
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return new bnjs(n);
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}
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if (typeof n === 'number')
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n = n.toString();
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arguments[0] = n;
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return _bnjs.apply(this, arguments);
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};
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bnjs.prototype = _bnjs.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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bnjs.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 bnjs(hex, 16);
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return bn;
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};
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bnjs.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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bnjs.prototype.gt = function(b) {
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if (typeof b === 'number')
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b = new bnjs(b);
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return this.cmp(b) > 0;
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};
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bnjs.prototype.lt = function(b) {
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if (typeof b === 'number')
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b = new bnjs(b);
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return this.cmp(b) < 0;
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};
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bnjs.prototype.toNumber = function() {
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return parseInt(this['toString'](10), 10);
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};
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bnjs.prototype.pow = function ( e ) {
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/*
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// e to integer, avoiding NaN or Infinity becoming 0.
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var i = e * 0 == 0 ? e | 0 : e,
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x = new bnjs(this.toString(), 16),
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y = new bnjs(1);
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for (i = i < 0 ? -i : i; ;) {
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if (i & 1) {
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y = y.mul(x);
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}
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i >>= 1;
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if (!i) {
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break;
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}
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x = x.mul(x);
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}
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return e < 0 ? (new bnjs(1)).mul(y) : y;
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*/
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};
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module.exports = bnjs;
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