Refactor writeFile to match nodejs File System native interface

lib/smb2.js

@@ -268,15 +268,21 @@ proto.readFile = function(filename, options, cb){
  *  - close the file
  *
  */
-proto.writeFile = function(src, dest, cb){
+proto.writeFile = function(filename, data, options, cb){
+
+  if(typeof options == 'function'){
+    cb = options;
+    options = {};
+  }
+
   var connection = this
     , file
-    , fileContent
-    , fileLength
+    , fileContent = new Buffer(data)
+    , fileLength = new bigint(8, fileContent.length)
     ;
 
   function createFile(fileCreated){
-    SMB2Request('create', {path:dest}, connection, function(err, f){
+    SMB2Request('create', {path:filename}, connection, function(err, f){
       if(err) cb && cb(err);
       // SMB2 set file size
       else {
@@ -296,23 +302,6 @@ proto.writeFile = function(src, dest, cb){
     });
   }
 
-  function openFile(fileOpened){
-    SMB2Request('open', {path:dest}, connection, function(err, f){
-      if(err) cb && cb(err);
-      // SMB2 read file content
-      else {
-        file = f;
-        fileOpened();
-      }
-    });
-  }
-
-  function openSrcFile(fileOpened){
-    fileContent = fs.readFileSync(src);
-    fileLength = new bigint(8, fileContent.length);
-    fileOpened();
-  }
-
   function setFileSize(fileSizeSetted){
     SMB2Request('set_info', {FileId:file.FileId, FileInfoClass:'FileEndOfFileInformation', Buffer:fileLength.toBuffer()}, connection, function(err){
       if(err) cb && cb(err);
@@ -366,18 +355,16 @@ proto.writeFile = function(src, dest, cb){
     checkDone();
   }
 
-  this.exists(dest, function(err, exists){
+  this.exists(filename, function(err, exists){
 
     if(err) cb && cb(err);
 
     else if(!exists){
 
       createFile(function(){
-        openSrcFile(function(){
-          setFileSize(function(){
-            writeFile(function(){
-              closeFile(cb);
-            });
+        setFileSize(function(){
+          writeFile(function(){
+            closeFile(cb);
           });
         });
       });