bn.js - npm Package Compare versions

Comparing version 0.15.2 to 0.16.0

lib/bn.js

@@ -25,3 +25,3 @@ // Utils
 
-function BN(number, base) {
+function BN(number, base, endian) {
   // May be `new BN(bn)` ?
@@ -41,4 +41,9 @@ if (number !== null &&
 
+  if (base === 'le' || base === 'be') {
+    endian = base;
+    base = 10;
+  }
+
   if (number !== null)
-    this._init(number || 0, base || 10);
+    this._init(number || 0, base || 10, endian || 'be');
 }
@@ -51,3 +56,3 @@ if (typeof module === 'object')
 
-BN.prototype._init = function init(number, base) {
+BN.prototype._init = function init(number, base, endian) {
   if (typeof number === 'number') {
@@ -70,23 +75,3 @@ if (number < 0) {
   } else if (typeof number === 'object') {
-    // Perhaps a Uint8Array
-    assert(typeof number.length === 'number');
-    this.length = Math.ceil(number.length / 3);
-    this.words = new Array(this.length);
-    for (var i = 0; i < this.length; i++)
-      this.words[i] = 0;
-
-    // Assume big-endian
-    var off = 0;
-    for (var i = number.length - 1, j = 0; i >= 0; i -= 3) {
-      var w = number[i] | (number[i - 1] << 8) | (number[i - 2] << 16);
-      this.words[j] |= (w << off) & 0x3ffffff;
-      this.words[j + 1] = (w >>> (26 - off)) & 0x3ffffff;
-      off += 24;
-      if (off >= 26) {
-        off -= 26;
-        j++;
-      }
-    }
-
-    return this.strip();
+    return this._initArray(number, base, endian);
   }
@@ -113,2 +98,37 @@ if (base === 'hex')
 
+BN.prototype._initArray = function _initArray(number, base, endian) {
+  // Perhaps a Uint8Array
+  assert(typeof number.length === 'number');
+  this.length = Math.ceil(number.length / 3);
+  this.words = new Array(this.length);
+  for (var i = 0; i < this.length; i++)
+    this.words[i] = 0;
+
+  var off = 0;
+  if (endian === 'be') {
+    for (var i = number.length - 1, j = 0; i >= 0; i -= 3) {
+      var w = number[i] | (number[i - 1] << 8) | (number[i - 2] << 16);
+      this.words[j] |= (w << off) & 0x3ffffff;
+      this.words[j + 1] = (w >>> (26 - off)) & 0x3ffffff;
+      off += 24;
+      if (off >= 26) {
+        off -= 26;
+        j++;
+      }
+    }
+  } else if (endian === 'le') {
+    for (var i = 0, j = 0; i < number.length; i += 3) {
+      var w = number[i] | (number[i + 1] << 8) | (number[i + 2] << 16);
+      this.words[j] |= (w << off) & 0x3ffffff;
+      this.words[j + 1] = (w >>> (26 - off)) & 0x3ffffff;
+      off += 24;
+      if (off >= 26) {
+        off -= 26;
+        j++;
+      }
+    }
+  }
+  return this.strip();
+};
+
 BN.prototype._parseHex = function parseHex(number, start) {
@@ -115,0 +135,0 @@ // Create possibly bigger array to ensure that it fits the number

package.json

 {
   "name": "bn.js",
-  "version": "0.15.2",
+  "version": "0.16.0",
   "description": "Big number implementation in pure javascript",
@@ -5,0 +5,0 @@ "main": "lib/bn.js",

test/bn-test.js

@@ -45,2 +45,9 @@ var assert = require('assert');
 
+  it('should import little endian', function() {
+    assert.equal(new BN([1,2,3], 10, 'le').toString(16), '30201');
+    assert.equal(new BN([1,2,3,4], 10, 'le').toString(16), '4030201');
+    assert.equal(new BN([1,2,3,4,5], 10, 'le').toString(16), '504030201');
+    assert.equal(new BN([1,2,3,4,5,6,7,8], 10, 'le').toString(16), '807060504030201');
+  });
+
   it('should return proper bitLength', function() {
@@ -47,0 +54,0 @@ assert.equal(new BN(0).bitLength(), 0);

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Total package byte prevSize

81784

increased by1.15%

Lines of code

2418

increased by1.04%

No dependency changes