Merge pull request #16 from cryptocoinjs/basex

use base-x

index.js

@@ -1,90 +1,8 @@
-// Base58 encoding/decoding
-// Originally written by Mike Hearn for BitcoinJ
-// Copyright (c) 2011 Google Inc
-// Ported to JavaScript by Stefan Thomas
-// Merged Buffer refactorings from base58-native by Stephen Pair
-// Copyright (c) 2013 BitPay Inc
-
+var basex = require('base-x')
 var ALPHABET = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
-var ALPHABET_MAP = {}
-for (var i = 0; i < ALPHABET.length; ++i) {
-  ALPHABET_MAP[ALPHABET.charAt(i)] = i
-}
-var BASE = ALPHABET.length
-
-function encode (buffer) {
-  if (buffer.length === 0) return ''
-
-  var i, j
-  var digits = [0]
-
-  for (i = 0; i < buffer.length; ++i) {
-    for (j = 0; j < digits.length; ++j) digits[j] <<= 8
-
-    digits[0] += buffer[i]
-
-    var carry = 0
-    for (j = 0; j < digits.length; ++j) {
-      digits[j] += carry
-
-      carry = (digits[j] / BASE) | 0
-      digits[j] %= BASE
-    }
-
-    while (carry) {
-      digits.push(carry % BASE)
-
-      carry = (carry / BASE) | 0
-    }
-  }
-
-  // deal with leading zeros
-  for (i = 0; buffer[i] === 0 && i < buffer.length - 1; ++i) digits.push(0)
-
-  // convert digits to a string
-  var str = ''
-  for (i = digits.length - 1; i >= 0; --i) {
-    str += ALPHABET[digits[i]]
-  }
-
-  return str
-}
-
-function decode (string) {
-  if (string.length === 0) return []
-
-  var i, j
-  var bytes = [0]
-
-  for (i = 0; i < string.length; ++i) {
-    var c = string[i]
-    if (!(c in ALPHABET_MAP)) throw new Error('Non-base58 character')
-
-    for (j = 0; j < bytes.length; ++j) bytes[j] *= BASE
-    bytes[0] += ALPHABET_MAP[c]
-
-    var carry = 0
-    for (j = 0; j < bytes.length; ++j) {
-      bytes[j] += carry
-
-      carry = bytes[j] >> 8
-      bytes[j] &= 0xff
-    }
-
-    while (carry) {
-      bytes.push(carry & 0xff)
-
-      carry >>= 8
-    }
-  }
-
-  // deal with leading zeros
-  for (i = 0; string[i] === '1' && i < string.length - 1; ++i) bytes.push(0)
-
-  return bytes.reverse()
-}
+var base58 = basex(ALPHABET)
 
 module.exports = {
-  encode: encode,
-  decode: decode
+  encode: base58.encode,
+  decode: base58.decode
 }

package.json

@@ -33,5 +33,8 @@
     "standard": "standard",
     "test": "npm run standard && npm run unit",
     "unit": "mocha"
+  },
+  "dependencies": {
+    "base-x": "^1.0.1"
   }
 }