Added support for electron original-fs

Author: David Kadlecek

adm-zip.js

@@ -1,11 +1,11 @@
-var fs = require("fs"),
+var Utils = require("./util");
+var fs = Utils.FileSystem.require(),
     pth = require("path");
 
 fs.existsSync = fs.existsSync || pth.existsSync;
 
 var ZipEntry = require("./zipEntry"),
-    ZipFile =  require("./zipFile"),
-    Utils = require("./util");
+    ZipFile =  require("./zipFile");
 
 module.exports = function(/*String*/input) {
     var _zip = undefined,

util/fattr.js

@@ -1,4 +1,4 @@
-var fs = require("fs"),
+var fs = require("./fileSystem").require(),
     pth = require("path");
 
 fs.existsSync = fs.existsSync || pth.existsSync;

util/fileSystem.js

@@ -0,0 +1,3 @@
+exports.require = function() {
+  return require(process.versions['electron'] ? "original-fs" : "fs");
+};

util/index.js

@@ -1,4 +1,5 @@
 module.exports = require("./utils");
+module.exports.FileSystem = require("./fileSystem");
 module.exports.Constants = require("./constants");
 module.exports.Errors = require("./errors");
 module.exports.FileAttr = require("./fattr");

util/utils.js

@@ -1,4 +1,4 @@
-var fs = require("fs"),
+var fs = require("./fileSystem").require(),
     pth = require('path');
 
 fs.existsSync = fs.existsSync || pth.existsSync;

zipFile.js

@@ -7,7 +7,7 @@ module.exports = function(/*String|Buffer*/input, /*Number*/inputType) {
         entryTable = {},
         _comment = new Buffer(0),
         filename = "",
-        fs = require("fs"),
+        fs = Utils.FileSystem.require(),
         inBuffer = null,
         mainHeader = new Headers.MainHeader();