From 73521048f680234a21ef19f45dd1950b4d59595c Mon Sep 17 00:00:00 2001
From: emi <emiliorizzo@gmail.com>
Date: Thu, 14 May 2020 12:12:05 -0600
Subject: [PATCH] Build 0.0.3

---
 README.md         | 34 ++++++++++++++++++++++++++++++++++
 dist/addresses.js | 27 ++++++++++++++++++++++-----
 dist/bytes.js     | 23 ++++++++++++++++-------
 package-lock.json |  2 +-
 package.json      |  2 +-
 5 files changed, 74 insertions(+), 14 deletions(-)

diff --git a/README.md b/README.md
index 7b91285..444c548 100644
--- a/README.md
+++ b/README.md
@@ -58,6 +58,17 @@ Search network info of checksummed address
 - [networks] <code>Array</code> - chainId list
 see: https://chainid.network/chains.json
 
+<a name="isZeroAddress"></a>
+
+### isZeroAddress(address, chainId) ⇒ <code>Boolean</code>
+Checks if is zero address.
+
+**Kind**: global function  
+**Params**
+
+- address <code>String</code>
+- chainId <code>Integer</code> | <code>String</code>
+
 
 ## Arrays
 <a name="arrayIntersection"></a>
@@ -113,6 +124,29 @@ Check if an array contains all the searched items
 - needle <code>Array</code>
 
 
+## Bytes
+<a name="toBuffer"></a>
+
+### toBuffer(value, [encoding]) ⇒ <code>Buffer</code>
+Converts strings or numbers to buffer
+
+**Kind**: global function  
+**Params**
+
+- value <code>string</code> | <code>number</code> | <code>buffer</code>
+- [encoding] <code>String</code> <code> = &#x27;hex&#x27;</code>
+
+<a name="bufferToHex"></a>
+
+### bufferToHex(buffer) ⇒ <code>String</code>
+Converts buffer to hex string
+
+**Kind**: global function  
+**Params**
+
+- buffer <code>Buffer</code>
+
+
 ## Hashes
 <a name="keccak256"></a>
 
diff --git a/dist/addresses.js b/dist/addresses.js
index de4e197..2296143 100644
--- a/dist/addresses.js
+++ b/dist/addresses.js
@@ -1,12 +1,19 @@
-"use strict";Object.defineProperty(exports, "__esModule", { value: true });exports.isAddress = isAddress;exports.toChecksumAddress = toChecksumAddress;exports.isValidChecksumAddress = isValidChecksumAddress;exports.isValidAddress = isValidAddress;exports.searchChecksummedNetworks = searchChecksummedNetworks;var _hashes = require("./hashes");
+"use strict";Object.defineProperty(exports, "__esModule", { value: true });exports.zeroAddress = zeroAddress;exports.isAddress = isAddress;exports.toChecksumAddress = toChecksumAddress;exports.isValidChecksumAddress = isValidChecksumAddress;exports.isValidAddress = isValidAddress;exports.searchChecksummedNetworks = searchChecksummedNetworks;exports.isZeroAddress = isZeroAddress;exports.ZERO_ADDRESS = void 0;var _hashes = require("./hashes");
 var _strings = require("./strings");
+var _bytes = require("./bytes");
 var _networks = _interopRequireDefault(require("./networks.json"));function _interopRequireDefault(obj) {return obj && obj.__esModule ? obj : { default: obj };}
 
+function zeroAddress() {
+  return (0, _strings.add0x)((0, _bytes.bufferToHex)(Buffer.allocUnsafe(20).fill(0)));
+}
+
+const ZERO_ADDRESS = zeroAddress();
+
 /**
-                                                                                                                                                                  * @description Check if a string is an address
-                                                                                                                                                                  * @param {String} address
-                                                                                                                                                                  * @returns {Boolean}
-                                                                                                                                                                  */
+                                     * @description Check if a string is an address
+                                     * @param {String} address
+                                     * @returns {Boolean}
+                                     */exports.ZERO_ADDRESS = ZERO_ADDRESS;
 function isAddress(address) {
   return /^(0x)?[0-9a-fA-F]{40}$/.test(address);
 }
@@ -59,4 +66,14 @@ function isValidAddress(address, chainId) {
 function searchChecksummedNetworks(address, networks) {
   networks = networks || _networks.default;
   return networks.filter(net => toChecksumAddress(address, net.chainId) === address);
+}
+
+/**
+   * @description Checks if is zero address.
+   * @param {String} address
+   * @param {Integer|String} chainId
+   * @returns {Boolean}
+   */
+function isZeroAddress(address) {
+  return address === ZERO_ADDRESS;
 }
\ No newline at end of file
diff --git a/dist/bytes.js b/dist/bytes.js
index 91692a9..fb77bf2 100644
--- a/dist/bytes.js
+++ b/dist/bytes.js
@@ -1,15 +1,24 @@
-"use strict";Object.defineProperty(exports, "__esModule", { value: true });exports.toBuffer = toBuffer;var _strings = require("./strings");
-
-
-
-
-
-
+"use strict";Object.defineProperty(exports, "__esModule", { value: true });exports.toBuffer = toBuffer;exports.bufferToHex = bufferToHex;var _strings = require("./strings");
 
+/**
+                                                                                                                                                                               * @description Converts strings or numbers to buffer
+                                                                                                                                                                               * @param {string|number|buffer} value
+                                                                                                                                                                               * @param {String} [encoding='hex']
+                                                                                                                                                                               * @returns {Buffer}
+                                                                                                                                                                               */
 function toBuffer(value, encoding = 'hex') {
   if (Buffer.isBuffer(value)) return value;
   if (typeof value === 'number') value = value.toString();
   value = (0, _strings.remove0x)(value);
   if (!encoding && (0, _strings.isHexString)(value)) encoding = 'hex';
   return Buffer.from(value, encoding);
+}
+
+/**
+   * @description Converts buffer to hex string
+   * @param {Buffer} buffer
+   * @returns {String}
+   */
+function bufferToHex(buffer) {
+  return (0, _strings.add0x)(buffer.toString('hex'));
 }
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 82eea11..6c3e74a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "rsk-utils",
-  "version": "0.0.2",
+  "version": "0.0.3",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 450665d..563c103 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "rsk-utils",
-  "version": "0.0.2",
+  "version": "0.0.3",
   "description": "A collection of JS utility functions for RSK",
   "main": "dist/index.js",
   "scripts": {